MicroPatent Report

Report Summary: Name of Session/Report: Report Created: 2010-12-03 - 05:23 GMTNumber of records selected: 10

Table of Contents1. US20100298175A1 C09K

LOST CIRCULATION MATERIAL FOR OILFIELD USE

2. US20100152070A1 C09K DRILLING LOST CIRCULATION MATERIAL

3. EP2196516A1 C09K SCHLUMBERGER SERVICES PETROLLOST CIRCULATION MATERIAL FOR DRILLING FLUIDS

4. EP2085449A1 C04B SCHLUMBERGER SERVICES PETROLCEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION

5. EP2083059A1 C04B SCHLUMBERGER SERVICES PETROLCEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES

6. WO2010133302A1 C09K SCHLUMBERGER SERVICES PETROLLOST CIRCULATION MATERIAL FOR OILFIELD USE

7. WO2009083238A1 C04B SCHLUMBERGER SERVICES PETROLCEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION

8. WO2009083238A4 C04B SCHLUMBERGER SERVICES PETROLCEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION

9. WO2009083236A4 C04B SCHLUMBERGER SERVICES PETROLCEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES

10. WO2009083236A1 C04B SCHLUMBERGER SERVICES PETROLCEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES

i © 2010 MicroPatent, LLC

MicroPatent ReportUS20100298175A1

LOST CIRCULATION MATERIAL FOR OILFIELD USE

[71] Applicant: N/A

[75] Inventors: Ghassemzadeh, Jaleh

[21] Application No.: US2009468232A

[22] Filed: 20090519

[43] Published: 20101125

[30] Priority: US US2009468232A 20090519

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[57] Abstract: A composition for reducing lost circulation in a well, while drilling the well with a drilling mud, which is composed of a base fluid, a mixture of particles, and a blend of fibers. The composition is used by stopping drilling with the mud, injecting a spacer, injecting the water-based composition, injecting a spacer, and resuming drilling with the oil-based mud.

[52] US Class: 507124 507100

[51] Int’l Class: C09K000802 C09K0008035

[52] ECLA: C09K0008516 C09K0008504B C09K0008508

1 © 2010 MicroPatent, LLC

US20100298175A1

[57] Claims:

Having thus described my invention, I claim:1. A water-based composition for reducing lost circulation while drilling a well with an oil-based drilling mud, the composition comprising: � an aqueous base fluid, � a mixture of coarse, medium and fine particles, and � a blend of long fibers and short fibers, � wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud. 2. The composition of claim 1 wherein the fine particles have an average particle size of from about 5 to about 15 microns, the medium particles have an average particle size of from about 20 to about 150 microns, and the coarse particles have an average particle size of from about 300 to about 2500 microns.3. The composition of claim 1 wherein the mixture of particles comprises from about 0 to about 15 weight percent fine particles, about 20 to about 40 weight percent medium particles, and about 40 to about 60 weight percent coarse particles.4. The composition of claim 1 wherein at least about 60 weight percent of the mixture of particles is acid-soluble.5. The composition of claim 1 wherein the long fibers are rigid and the short fibers are flexible.6. The composition of claim 1 wherein the weight ratio of long fibers to short fibers is from about 1:4 to about 4:1.7. The composition of claim 1 wherein at least a portion of the fibers is acid-soluble.8. The composition of claim 1 wherein the long fibers comprise water-insoluble polyvinyl alcohol and the short fibers comprise water-soluble polyvinyl alcohol.9. The composition of claim 1 wherein the short fibers comprise a mixture of fibers of two different lengths.10. The composition of claim 1 wherein both the long fibers and the short fibers comprise polyvinyl alcohol fibers.11. The composition of claim 1 wherein the long fiber is polyvinyl alcohol and the short fiber is an inorganic fiber.12. The composition of claim 1 wherein the aqueous base fluid is a drilling mud.13. The composition of claim 1 wherein at least one of the long fibers and the short fibers comprises a metal.14. A water-based composition for reducing lost circulation while drilling a well with an oil-based drilling mud, the composition comprising:

2 © 2010 MicroPatent, LLC

US20100298175A1

� an aqueous base fluid, � a mixture of coarse, medium and fine particles, and � a blend of two different rigid fibers, � wherein the different rigid fibers comprise fibers of different lengths or different diameters or different compositions, and � wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud. 15. A method of reducing lost circulation in a well, while drilling with an oil-based drilling mud, comprising: � injecting a first spacer, then � injecting a water-based composition comprising � an aqueous base fluid, � a mixture of coarse, medium and fine particles, and � a blend of long fibers and short fibers, � wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud, and then � injecting a second spacer into the well. 16. A method of reducing lost circulation in a well, while drilling with oil-based drilling mud, comprising: � injecting a first spacer, then � injecting a water-based composition comprising � an aqueous base fluid, � a mixture of coarse, medium and fine particles, and � a blend of long fibers and short fibers, � wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud, into the well, � wherein the concentration or the length of the long fibers may initially be zero and is increased during the injection, and then � injecting a second spacer into the well. 17. The method of claim 15 wherein the first spacer comprises a surfactant.

3 © 2010 MicroPatent, LLC

MicroPatent ReportUS20100152070A1

DRILLING LOST CIRCULATION MATERIAL

[71] Applicant: N/A

[75] Inventors: Ghassemzadeh, Jaleh

[21] Application No.: US2009631934A

[22] Filed: 20091207

[43] Published: 20100617

[30] Priority: EP EP2008171405A 20081211 ...

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[57] Abstract: An engineered composition for reducing lost circulation in a well includes a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers. The long fibers are rigid and the short fibers are flexible. The long fibers form a tridimensional mat or net in the lost-circulation pathway that traps the mixture of particles and short flexible fibers to form a mudcake. The mixture of particles and blend of fibers may be added to water-based and oil-based drilling fluids. The composition, size, and concentration of each component of the mixture of particles and blend of fibers may be fine-tuned for each application.

[52] US Class: 507212 507100 507117 507124 507200 507219 507221 507230 507231 507269 507270 507271 507277

[51] Int’l Class: C09K000858 C09K000802 C09K0008588

[52] ECLA: C09K0008506 C09K0008035 C09K0008504B C09K0008516 E21B002100M

4 © 2010 MicroPatent, LLC

US20100152070A1

[57] Claims:

1. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particle size of from 300 to 1200 µm, medium particles having an average particle size of from 20 to 150 µm and optionally fine particles having an average particle size of from 5 to 15 µm, and a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm.2. The composition of claim 1 wherein the mixture of particles comprises from about 0 to about 15 weight percent fine particles, about 20 to about 40 weight percent medium particles, and about 40 to about 60 weight percent coarse particles.3. The composition of claim 1 wherein the particles are selected from the group consisting of alkaline earth carbonates, poly-paraphenyleneterephthalamide, mica, rubber, polyethylene, polypropylene, polystyrene, poly(styrene-butadiene), fly ash, silica, mica, alumina, glass, barite, ceramic, metals and metal oxides, starch and modified starch, hematite, ilmenite, microspheres, glass microspheres, magnesium oxide, gilsonite, sand, and mixtures thereof.4. The composition of claim 1 wherein the mixture of particles comprises about 8 to about 12 weight percent fine calcium carbonate, about 30 to about 40 weight percent poly-paraphenyleneterephthalamide, mica or calcium carbonate, and about 45 to about 60 weight percent coarse calcium carbonate.5. The composition of claim 1 wherein at least about 60 weight percent of the mixture of particles is acid-soluble.6. The composition of claim 1 wherein the fibers are selected from the group consisting of polyvinyl alcohol, polyamide, aramid, para-aramid, polylactic acid, polyglycolic acid, metals, painted metals, polymer-coated metals, hollow metals, hollow painted metals, hollow coated metals, polypropylene, polyethylene, polyester, polyamide, polyolefin, novoloid, phenol-aldehyde, nylon, rayon, extruded mineral wool, carbon, basalt, asbestos, and glass.7. The composition of claim 1 wherein the weight ratio of long fibers to short fibers is from about 1:4 to about 4:1.8. The composition of claim 7 wherein the length ratio of long fibers to short fibers is from about 1 to about 3.9. The composition of claim 1 wherein at least a portion of the fibers is acid-soluble.10. The composition of any of claim 1 wherein the long fibers comprise water-insoluble polyvinyl alcohol and the short fibers comprise water-soluble polyvinyl alcohol.11. The composition of claim 1 wherein the short fibers comprise a mixture of fibers of two different lengths.12. The composition of claim 11 wherein the short fibers comprise a mixture of

5 © 2010 MicroPatent, LLC

US20100152070A1

two different lengths of polyvinyl alcohol fibers.13. The composition of claim 11 wherein the short fibers comprise a mixture of multiple lengths of polyaramid fibers.14. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particles size of from 300 to 1200 µm, medium particles having an average particles size of from 20 to 150 µm and optionally fine particles having an average particles size of from 5 to 15 µm, and a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm., and a drilling fluid.15. The composition of claim 14 wherein the mixture of particles is added to the drilling fluid at a concentration of from about 2.85 kg/m3to about 130 kg/m3.16. The composition of claim 14 wherein the blend of fibers is added to the drilling fluid at a concentration of from about 14 kg/m3to about 42 kg/m3.17. The composition of claim 14 wherein at least a portion of the fibers is coated with a material that improves the dispersion of the fibers in the drilling fluid.18. The composition of claim 14 wherein the drilling fluid is water-based, the long fibers comprise water-insoluble polyvinyl alcohol and the short fibers comprise polyaramid fibers, water soluble polyvinyl alcohol fibers, or magma fiber.19. The composition of claim 14 wherein the drilling fluid is oil-based and the long fibers comprise water-insoluble polyvinyl alcohol or para-aramid.20. The composition of claim 14 wherein the drilling fluid is oil-based, the short fibers comprise para-aramid fibers and the long fibers comprise polyaramid fibers.21. The composition of claim 14 wherein the drilling fluid is oil-based, the long fibers comprise non-water soluble polyvinyl alcohol fiber or magma fiber.22. The composition of claim 14 wherein the long fibers comprise polyaramid fibers or polyvinyl alcohol fibers.23. The composition of claim 14 wherein the short fibers comprise a mixture of two different lengths or a mixture of multiple lengths of fibers.24. The composition of claim 14 wherein both the long fibers and the short fibers comprise polyvinyl alcohol fibers.25. A composition for reducing lost circulation in a well comprising a mixture of coarse particles having an average particle size of from 300 to 1200 µm, medium particles having an average particle size of from 20 to 150 µm and fine particles having an average particle size of from 5 to 15 µm, and a blend of fibers having a Young’s Modulus of greater than about 20 GPa.26. The composition of claim 25 wherein the different rigid fibers each comprise water-insoluble polyvinyl alcohol.

6 © 2010 MicroPatent, LLC

US20100152070A1

27. A method of reducing lost circulation in a well comprising adding a mixture coarse particles having an average particles size of from 300 to 1200 µm, medium particles having an average particles size of from 20 to 150 µm and optionally fine particles having an average particles size of from 5 to 15 µm and adding a blend of long fibers having an average length of from 8 to 15 mm and short fibers having an average length of from 1 to 8 mm, to a drilling fluid and injecting the fluid into the well.

7 © 2010 MicroPatent, LLC

MicroPatent ReportEP2196516A1

LOST CIRCULATION MATERIAL FOR DRILLING FLUIDS

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER HOLDINGS; . . .

[72] Inventors: GHASSEMZADEH, Jaleh, c/o Etudes et Productions Schlumberger

[21] Application No.: EP2008171405A

[22] Filed: 20081211

[43] Published: 20100616

[30] Priority: EP EP2008171405A 20081211

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[57] Abstract: A composition for reducing lost circulation in a well includes a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers. The long fibers are rigid and the short fibers are flexible. The long fibers form a mat or net in the lost-circulation pathway that traps the mixture of particles and short flexible fibers to form a mudcake. The mixture of particles and blend of fibers may be added to water-based and oil-based drilling fluids. The composition, size, and concentration of each component of the mixture of particles and blend of fibers may be fine-tuned for each application.

[52] US Class:

[51] Int’l Class: C09K0008035 E21B002100 C09K000803 C09K0008516

[52] ECLA: C09K0008506 C09K0008035 C09K0008504B C09K0008516 E21B002100M

8 © 2010 MicroPatent, LLC

EP2196516A1

[57] Claims:

1. A composition for reducing lost circulation in a well comprising a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers.2. The composition of claim 1 wherein the fine particles have an average particle size of from about 5 to about 15 microns.3. The composition of claim 1 wherein the medium particles have an average particle size of from about 20 to about 150 microns.4. The composition of claim 1 wherein the coarse particles have an average particle size of from about 300 to about 1200 microns.5. The composition of any of the preceding claims wherein the mixture of particles comprises from about 0 to about 15 weight percent fine particles, about 20 to about 40 weight percent medium particles, and about 40 to about 60 weight percent coarse particles.6. The composition of any of the preceding claims wherein the particles are selected from the group consisting of alkaline earth carbonates, poly-paraphenyleneterephthalamide, mica, rubber, polyethylene, polypropylene, polystyrene, poly(styrene-butadiene), fly ash, silica, mica, alumina, glass, barite, ceramic, metals and metal oxides, starch and modified starch, hematite, ilmenite, microspheres, glass microspheres, magnesium oxide, gilsonite, sand, and mixtures thereof.7. The composition of any of the preceding claims wherein the mixture of particles comprises about 8 to about 12 weight percent fine calcium carbonate, about 30 to about 40 weight percent poly-paraphenyleneterephthalamide, and about 45 to about 60 weight percent coarse calcium carbonate.8. The composition of any of the preceding claims wherein at least about 60 weight percent of the mixture of particles is acid-soluble.9. The composition of any of the preceding claims wherein the fibers are selected from the group consisting of polyvinyl alcohol, polyamide, aramid, para-aramid, polylactic acid, polyglycolic acid, metals, painted metals, polymer-coated metals, hollow metals, hollow painted metals, hollow coated metals, polypropylene, polyethylene, polyester, polyamide, polyolefin, novoloid, phenol-aldehyde, nylon, rayon, extruded mineral wool, carbon, basalt, asbestos, and glass.10. The composition of any of the preceding claims wherein the long fibers are rigid and the short fibers are flexible.11. The composition of any of the preceding claims wherein the weight ratio of long fibers to short fibers is from about 1:4 to about 4:1.12. The composition of any of the preceding claims wherein the length ratio of long fibers to short fibers is from about 1 to about 3.13. The composition of any of the preceding claims wherein at least a portion of the fibers is acid-soluble.

9 © 2010 MicroPatent, LLC

EP2196516A1

14. The composition of any of the preceding claims wherein the long fibers comprise water-insoluble polyvinyl alcohol and the short fibers comprise water-soluble polyvinyl alcohol.15. The composition of any of the preceding claims wherein the short fibers comprise a mixture of fibers of two different lengths.16. The composition of claim 15 wherein the short fibers comprise a mixture of two different lengths of polyvinyl alcohol fibers.17. The composition of claim 15 wherein the short fibers comprise a mixture of multiple lengths of polyaramid fibers.18. A composition for reducing lost circulation in a well comprising a mixture of coarse, medium and fine particles, a blend of long fibers and short fibers, and a drilling fluid.19. The composition of claim 18 wherein the mixture of particles is added to the drilling fluid at a concentration of from about 2.85 kg/m3 to about 130 kg/m3.20. The composition of claim 18 wherein the blend of fibers is added to the drilling fluid at a concentration of from about 14 kg/m3 to about 42 kg/m3.21. The composition of any of claims 18 to 20 wherein at least a portion of the fibers is coated with a material that improves the dispersion of the fibers in the drilling fluid.22. The composition of any of claims 18 to 20 wherein the drilling fluid is water-based, the long fibers comprise water-insoluble polyvinyl alcohol and the short fibers comprise polyaramid fibers.23. The composition of any of claims 18 to 20 wherein the drilling fluid is oil-based and the long fibers comprise para-aramid.24. The composition of any of claims 18 to 20 wherein the drilling fluid is oil-based, the short fibers comprise para-aramid fibers and the long fibers comprise polyaramid fibers.25. The composition of any of claims 18 to 20 wherein the long fibers comprise polyaramid fibers or polyvinyl alcohol fibers.26. The composition of any of claims 18 to 20 wherein the short fibers comprise a mixture of two different lengths or a mixture of multiple lengths of fibers.27. The composition of any of claims 18 to 20 wherein both the long fibers and the short fibers comprise polyvinyl alcohol fibers.28. A composition for reducing lost circulation in a well comprising a mixture of coarse, medium and fine particles, and a blend of two different rigid fibers.29. The composition of claim 28 wherein the different rigid fibers comprise fibers of different length or different diameter.30. The composition of claim 28 wherein the different rigid fibers each

10 © 2010 MicroPatent, LLC

EP2196516A1

comprise water-insoluble polyvinyl alcohol.31. A method of reducing lost circulation in a well comprising adding a mixture of coarse, medium and optional fine particles, and adding a blend of long fibers and short fibers, to a drilling fluid and injecting the fluid into the well.32. A method of reducing lost circulation in a well comprising adding a mixture of coarse, medium and optional fine particles to the drilling fluid, adding short fibers to the drilling fluid, adding long fibers to the drilling fluid, and injecting the fluid into the well, wherein the concentration or the length of the long fibers may initially be zero and is increased during the treatment.

11 © 2010 MicroPatent, LLC

MicroPatent ReportEP2085449A1

CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER HOLDINGS; . . .

[72] Inventors: Ghassemzadeh, Jaleh; Guiollard, France, Etudes et Productions . . .

[21] Application No.: EP2007150477A

[22] Filed: 20071228

[43] Published: 20090805

[30] Priority: EP EP2007150477A 20071228

[No drawing]

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[57] Abstract: Disclosed is a method for controlling loss circulation and simultaneously strengthening a weakened formation when drilling for oil. This invention relates to the permeable subterranean formation and natural and induced fractured formations that encounter severe losses and their treatment with a composition composed of long rigid organic fibre with different type of fibres selected from a category of organic or inorganic fibres along with different particle sizes that orientation of fibres and packing of the solids shows a good blockage effect to resist the loss and later the final set material develop required compressive strength to cure those losses and strengthening the structure.

[52] US Class:

[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606

[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487

12 © 2010 MicroPatent, LLC

EP2085449A1

[57] Claims:

1. A cement composition comprising a mixture of a blend including cement and/or micro cement, coarse particles, fibres; fine and coarse carbonate particles and water; wherein the coarse particles comprise at least one material with an average particle size of 300-1200 microns.2. A composition as claimed in claim 1, wherein the coarse particles comprise sand, granular weighing agent solids, lightweight particles, carbonates or mixtures thereof.3. A composition as claimed in claim 2, wherein the composition optionally contains fine particles and is acidizable, wherein the coarse and/or fine particles comprise carbonates and the weight ratio of carbonate to cement in the blend is 1:1 to 2:1.4. A composition as claimed in claim 2 or 3, wherein the carbonates comprise calcium carbonate, marble, magnesium carbonate, dolomite or mixtures thereof.5. A composition as claimed in any preceding claim, wherein the fibres comprise organic and/or inorganic fibres.6. A composition as claimed in claim 5, wherein the organic fibres comprise polylactide fibres, water soluble polyvinyl alcohol fibres, water-insoluble polyvinyl alcohol fibres, or mixtures thereof.7. A composition as claimed in claim 6, comprising water-insoluble polyvinyl fibres having a diameter of 0.2 mm to 0.66 mm and a length of 12 mm to 20 mm.8. A composition as claimed in claim 6, comprising polyvinyl alcohol fibres having a length of 1.5 mm to 6 mm that are water-soluble at temperatures of 20 to 100 degC.9. A composition as claimed in claim 8, wherein the fibres have water solubility in the temperature range of 90 to 100 degrees Celsius.10. A composition as claimed in any preceding claim, wherein organic fibres are present in an amount up to 7 lb/barrel.11. A composition as claimed in claim 5, wherein the inorganic fibres are present in an amount of up to 10 lb/barrel.12. A composition as claimed in claim 5 or 11, wherein the inorganic fibres comprise mineral oxide fibres.13. A composition as claimed in claim 12, wherein the mineral oxide fibres are coated with a monomolecular film of surfactant.14. A composition as claimed in claim 12 or 13, wherein the mineral oxide fibres comprise calcium oxide (CaO) and/or silicon dioxide (SiO

2) fibres.

15. A composition as claimed in claim 12, 13 or 14, wherein the length of the mineral oxide fibres is 0.1 mm to 16 mm16. A composition as claimed in claim 15, wherein the length is 10 to 16 mm.17. A composition as claimed in any of claims 12-16, wherein the mineral oxide fibres have an average diameter of 7 to 10 microns.18. A composition as claimed in any preceding claim, wherein the organic fibre

13 © 2010 MicroPatent, LLC

EP2085449A1

is acidizable and biodegradable and mineral fibre is acidizable.19. A method of treating a well, comprising pumping a composition as claimed in any preceding claim into the well and allowing it to set.20. A method of making a composition as claimed in any of claims1-18, comprising preparing a blend without fibres, mixing the blend with water to form a slurry and adding polyvinyl alcohol fibres in an amount of 1 to 3 lb/barrel of the final slurry.21. A method of making a composition as claimed in any of claims 1-18, comprising preparing adding the components of the blend to form a mixture, wherein mineral oxide fibres are added before the addition of cement.

14 © 2010 MicroPatent, LLC

MicroPatent ReportEP2083059A1

CEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER HOLDINGS; . . .

[72] Inventors: Ghassemzadeh, Jaleh; Zamora, Dominique, c/o Schlumberger Riboud . . .

[21] Application No.: EP2007150473A

[22] Filed: 20071228

[43] Published: 20090729

[30] Priority: EP EP2007150473A 20071228

[No drawing]

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[57] Abstract: A cement composition, comprises a mixture of a blend of materials including cement and/or micro cement, calcium carbonate, organic fibres, and inorganic fibres; and water; wherein the composition forms a cement that is at least partially soluble in acid and/or water. A method of treating a well, comprises pumping the composition into the well, allowing the cement to set, and treating the set cement so that it is partially to completely dissolved. In case of partial dissolution the residue in time is degradable. The inorganic fiber can be used in the traditional cementing in all stages of the well construction to defeat partial losses and improve the set properties of the final set cement.

[52] US Class:

[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606

[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487

15 © 2010 MicroPatent, LLC

EP2083059A1

[57] Claims:

1. A cement composition, comprising a mixture of a blend of materials including cement and/or micro cement, calcium carbonate, organic fibres, and/or inorganic fibres; and water; wherein the cement composition fibres are acid soluble or degradable by hydrolysis2. A composition as claimed in claim 1, wherein the calcium carbonate has a particle size of less than or equal to 300 microns.3. A composition as claimed in claim 1 or 2, wherein the weight ratio of the cement to calcium carbonate is approximately 1:1 to 1:2.4. A composition as claimed in claim 1, 2 or 3, wherein the cement and calcium carbonate have substantially similar particle sizes.5. A composition as claimed in any preceding claim, comprising calcium carbonate and/or micro-cement with a particle size of less than 15 microns present in an amount of 10-15% by weight of blend; cement present in an amount of 30-35% by weight of blend and calcium carbonate with a particle size of less than to equal 300 microns present in an amount of 50-60% by weight of blend.6. A composition as claimed in claim 5, wherein the calcium carbonate and micro cement have particle sizes less than 15 microns.7. A composition as claimed in any preceding claim, wherein the organic fibres are polylactic acid fibres.8. A composition as claimed in claim 7, wherein the polylactic acid fibres are released from the structure after acidization hydrolysis in the presence of water.9. A composition as claimed in claim 7 or 8, wherein the polylactic acid fibres comprise a blend of different grades of fibre.10. A composition as claimed in claim 7, 8 or 9, wherein the polylactide fibres are of the same or different lengths from 0.5 to 12 mm.11. A composition as claimed in any of claims 7-10, wherein polylactide fibre is present in an amount of 0.1 to 15 lbs per barrel.12. A composition as claimed in claim 11, wherein polylactide (PLA) fibre is present in an amount of 0.5 to 5 lbs per barrel.13. A composition as claimed in claim 12, wherein polylactide (PLA) fibres is present in an amount of 0.5 to 3 lbs per barrel.14. A compositions as claimed in any preceding claim, wherein the inorganic fibres are in the form of nodules.15. A composition as claimed in claim 14, wherein fibres in the nodules are coated with a monomolecular film of surfactant.16. A composition as claimed in claim 14 or 15, wherein the inorganic fibres are mineral oxide fibres.17. A composition as claimed in claim 16, wherein the mineral oxide fibres are calcium oxide (CaO) and/or silicon dioxide (SiO

2) fibres.

16 © 2010 MicroPatent, LLC

EP2083059A1

18. A composition as claimed in any preceding claim, further comprising other solids, density control agents and liquid components for modifying the property of the composition or the set cement produced by the composition.19. A composition as claimed in any preceding claim, wherein magma fibre is present in an amount of 0.1 to 15 lbs per barrel.20. A composition as claimed in 19, where in magma fiber is present in an amount of 0.5 to 5 lbs per barrel.21. A composition as claimed in any preceding claim, wherein the organic fibres comprise polyvinyl alcohol fibres.22. A composition as claimed in claim 22, where in the polyvinyl alcohol fibres are present in one length of between 4 - 6 mm, or as a blend of different lengths of 1.5 mm and 4 - 6 mm lengths.23. A composition as claimed in claim 21 or 22, wherein polyvinyl alcohol fibre is present in an amount of 0.1 to 7 lbs per barrel.24. A composition as claimed in claim 23, wherein polyvinyl alcohol fibre is present in an amount of 0.5 to 5 lbs per barrel.25. A composition as claimed in claim 24, wherein each polyvinyl alcohol fibres is present in an amount of 0.5 to 3 lbs per barrel.26. A method of treating a well, comprising pumping a composition as claimed in any preceding claim into the well, allowing the cement to set, and treating the set cement so that at least the fibre component is partially or completely dissolved.27. A method as claimed in claim 26, comprising treating the composition with an acid.28. A method as claimed in claim 27, wherein the acid comprises hydrochloric acid.29. A method as claimed in claim 27 or 28, further comprising treating the composition with a solution containing predetermined metallic ions to catalyse dissolution.30. A method as claimed in any of claims 26-29, comprising placing a plug of the composition in a region of the well suffering from fluid loss.31. A method as claimed in any of claims 26-30, wherein both magma fibre and polyvinyl alcohol fibre is present, acid dissolution being completed in one step.32. A method of making a compositions as claimed in any of claims 1 to 25, wherein inorganic fibres are added to the blend before or after the addition of cement.33. A method as claimed in claim 32, wherein the fibre is added before blending with cement.34. A method of making a compositions of as claimed in any of claims 1-25, wherein organic fibres are the last ingredient to be added to the composition

17 © 2010 MicroPatent, LLC

EP2083059A1

before it is pumped into a wellbore.

18 © 2010 MicroPatent, LLC

MicroPatent ReportWO2010133302A1

LOST CIRCULATION MATERIAL FOR OILFIELD USE

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER TECHNOLOGY BV; . . .

[72] Inventors: GHASSEMZADEH, Jaleh

[21] Application No.: WO2010EP2826A

[22] Filed: 20100429

[43] Published: 20101125

[30] Priority: US US2009468232A 20090519 ...

[No drawing]

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[57] Abstract: A composition for reducing lost circulation in a well, while drilling the well with a drilling mud, which is composed of a base fluid, a mixture of particles, and a blend of fibers. The composition is used by stopping drilling with the mud, injecting a spacer, injecting the water-based composition, injecting a spacer, and resuming drilling with the oil-based mud.

[52] US Class:

[51] Int’l Class: C09K0008508 C09K0008504 C09K0008516

[52] ECLA: C09K0008516 C09K0008504B C09K0008508

19 © 2010 MicroPatent, LLC

WO2010133302A1

[57] Claims:

Having thus described my invention, I claim:1. A water-based composition for reducing lost circulation while drilling a well with an oil-based drilling mud, the composition comprising an aqueous base fluid, a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers, wherein at least a portion of the medium particles. or coarse particles or both swells in the presence of the oil-based drilling mud.2. The composition of claim 1 wherein the optional fine particles have an average particle size of from about 5 to about 15 microns, the medium particles have an average particle size of from about 20 to about 150 microns, and the coarse particles have an average particle size of from about 300 to about 2500 microns.3. The composition of claim 1 wherein the mixture of particles comprises from about 0 to about 15 weight percent fine particles, about 20 to about 40 weight percent medium particles, and about 40 to about 60 weight percent coarse particles.4. The composition of claim 1 wherein at least about 60 weight percent of the mixture of particles is acid-soluble.5. The composition of claim 1 wherein the long fibers are rigid and the short fibers are flexible.6. The composition of claim 1 wherein the weight ratio of long fibers to short fibers is from about 1 :4 to about 4:1.7. The composition of claim 1 wherein at least a portion of the fibers is acid- soluble.8. The composition of claim 1 wherein the long fibers comprise water-insoluble polyvinyl alcohol and the short fibers comprise water-soluble polyvinyl alcohol.9. The composition of claim 1 wherein the short fibers comprise a mixture of fibers of two different lengths.10. The composition of claim 1 wherein both the long fibers and the short fibers comprise polyvinyl alcohol fibers.11. The composition of claim 1 wherein the long fiber is polyvinyl alcohol and the short fiber is an inorganic fiber. 12. The composition of claim 1 wherein the aqueous base fluid is a drilling mud.13. The composition of claim 1 wherein at least one of the long fibers and the short fibers comprises a metal.14. A water-based composition for reducing lost circulation while drilling a well with an oil-based drilling mud, the composition comprising an aqueous base fluid, a mixture of coarse, medium and optional fine particles, and a blend of two different rigid fibers, wherein the different rigid fibers

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comprise fibers of different lengths or different diameters or different compositions, wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud.15. A method of reducing lost circulation in a well, while drilling with an oil-based drilling mud, comprising injecting a first spacer, then injecting a water-based composition comprising an aqueous base fluid, a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers, wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud, and then injecting a second spacer into the well.16. A method of reducing lost circulation in a well, while drilling with oil-based drilling mud, comprising injecting a first spacer, then injecting a water-based composition comprising an aqueous base fluid, a mixture of coarse, medium and optional fine particles, and a blend of long fibers and short fibers, wherein at least a portion of the medium particles or coarse particles or both swells in the presence of the oil-based drilling mud, into the well, wherein the concentration or the length of the long fibers may initially be zero and is increased during the injection, and then injecting a second spacer into the well.17. The method of claim 15 wherein the first spacer comprises a surfactant.

21 © 2010 MicroPatent, LLC

MicroPatent ReportWO2009083238A1

CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER TECHNOLOGY BV; . . .

[72] Inventors: GHASSEMZADEH, Jaleh; CARITEY, Jean-Philippe; GUIOLLARD, France

[21] Application No.: WO2008EP11091A

[22] Filed: 20081223

[43] Published: 20090709

[30] Priority: EP EP2007150477A 20071228 ...

[No drawing]

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[57] Abstract: Disclosed is a method for controlling loss circulation and simultaneously strengthening a weakened formation when drilling for oil. This invention relates to the permeable subterranean formation and natural and induced fractured formations that encounter severe losses and their treatment with a composition composed of long rigid organic fibre with different type of fibres selected from a category of organic or inorganic fibres along with different particle sizes that orientation of fibres and packing of the solids shows a good blockage effect to resist the loss and later the final set material develop required compressive strength to cure those losses and strengthening the structure.

[52] US Class:

[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606

[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487

22 © 2010 MicroPatent, LLC

WO2009083238A1

[57] Claims:

Claims1. A cement composition comprising a mixture of a blend including cement and/or micro cement, coarse particles, fibres; fine and coarse carbonate particles and water; wherein the coarse particles comprise at least one material with an average particle size of 300-1200 microns. 2. A composition as claimed in claim 1, wherein the coarse particles comprise sand, granular weighing agent solids, lightweight particles, carbonates or mixtures thereof.3. A composition as claimed in claim 2, wherein the composition optionally contains fine particles and is acidizable, wherein the coarse and/or fine particles comprise carbonates and the weight ratio of carbonate to cement in the blend is 1:1 to 2:1 .4. A composition as claimed in claim 2 or 3, wherein the carbonates comprise calcium carbonate, marble, magnesium carbonate, dolomite or mixtures thereof.5. A composition as claimed in any preceding claim, wherein the fibres comprise organic and/or inorganic fibres.6. A composition as claimed in claim 5, wherein the organic fibres comprise polylactide fibres, water soluble polyvinyl alcohol fibres, water-insoluble polyvinyl alcohol fibres, or mixtures thereof.7. A composition as claimed in claim 6, comprising water-insoluble polyvinyl fibres having a diameter of 0.2 mm to 0.66 mm and a length of 12 mm to 20 mm.8. A composition as claimed in claim 6, comprising polyvinyl alcohol fibres having a length of 1.5 mm to 6 mm that are water-soluble at temperatures of 20 to lOO degC.9. A composition as claimed in claim 8, wherein the fibres have water solubility in the temperature range of 90 to 100 degrees Celsius.10. A composition as claimed in any preceding claim, wherein organic fibres are present in an amount up to 7 Ib/barrel.11.A composition as claimed in claim 5, wherein the inorganic fibres are present in an amount of up to 10 Ib/barrel.12. A composition as claimed in claim 5 or 11, wherein the inorganic fibres comprise mineral oxide fibres.13. A composition as claimed in claim 12, wherein the mineral oxide fibres are coated with a monomolecular film of surfactant.14. A composition as claimed in claim 12 or 13, wherein the mineral oxide fibres comprise calcium oxide (CaO) and/or silicon dioxide (SiO2) fibres.15. A composition as claimed in claim 12, 13 or 14, wherein the length of the mineral oxide fibres is 0.1 mm to 16 mm16. A composition as claimed in claim 15, wherein the length is 10 to 16 mm.17. A composition as claimed in any of claims 12-16, wherein the mineral oxide fibres have an average diameter of 7 to 10 microns.

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18. A composition as claimed in any preceding claim, wherein the organic fibre is acidizable and biodegradable and mineral fibre is acidizable.19. A method of treating a well, comprising pumping a composition as claimed in any preceding claim into the well and allowing it to set.20. A method of making a composition as claimed in any of claims1-18, comprising preparing a blend without fibres, mixing the blend with water to form a slurry and adding polyvinyl alcohol fibres in an amount of 1 to 3 Ib/barrel of the final slurry.2 1.A method of making a composition as claimed in any of claims 1-18, comprising preparing adding the components of the blend to form a mixture, wherein mineral oxide fibres are added before the addition of cement.

24 © 2010 MicroPatent, LLC

MicroPatent ReportWO2009083238A4

CEMENT COMPOSITION COMPRISING MIXTURE OF ORGANIC AND INORGANIC FIBRES FOR CURING SEVERE LOSSES ESPECIALLY IN THE RESERVOIR SECTION

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER TECHNOLOGY BV; . . .

[72] Inventors: GHASSEMZADEH, Jaleh; CARITEY, Jean-Philippe; GUIOLLARD, France

[21] Application No.: WO2008EP11091A

[22] Filed: 20081223

[43] Published: 20090827

[30] Priority: EP EP2007150477A 20071228 ...

[No drawing]

Go to Fulltext Get PDF

[57] Abstract: Disclosed is a method for controlling loss circulation and simultaneously strengthening a weakened formation when drilling for oil. This invention relates to the permeable subterranean formation and natural and induced fractured formations that encounter severe losses and their treatment with a composition composed of long rigid organic fibre with different type of fibres selected from a category of organic or inorganic fibres along with different particle sizes that orientation of fibres and packing of the solids shows a good blockage effect to resist the loss and later the final set material develop required compressive strength to cure those losses and strengthening the structure.

[52] US Class:

[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606

[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487

25 © 2010 MicroPatent, LLC

MicroPatent ReportWO2009083236A4

CEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER TECHNOLOGY BV; . . .

[72] Inventors: GHASSEMZADEH, Jaleh; CARITEY, Jean-Philippe; ZAMORA, Dominique

[21] Application No.: WO2008EP11089A

[22] Filed: 20081223

[43] Published: 20090827

[30] Priority: EP EP2007150473A 20071228 ...

[No drawing]

Go to Fulltext Get PDF

[57] Abstract: A cement composition, comprises a mixture of a blend of materials including cement and/or micro cement, calcium carbonate, organic fibres, and inorganic fibres; and water; wherein the composition forms a cement that is at least partially soluble in acid and/or water. A method of treating a well, comprises pumping the composition into the well, allowing the cement to set, and treating the set cement so that it is partially to completely dissolved. In case of partial dissolution the residue in time is degradable. The inorganic fiber can be used in the traditional cementing in all stages of the well construction to defeat partial losses and improve the set properties of the final set cement.

[52] US Class:

[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606

[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487

26 © 2010 MicroPatent, LLC

MicroPatent ReportWO2009083236A1

CEMENT COMPOSITIONS CONTAINING INORGANIC AND ORGANIC FIBRES

[71] Applicant: SCHLUMBERGER SERVICES PETROL; SCHLUMBERGER TECHNOLOGY BV; . . .

[72] Inventors: GHASSEMZADEH, Jaleh; CARITEY, Jean-Philippe; ZAMORA, Dominique

[21] Application No.: WO2008EP11089A

[22] Filed: 20081223

[43] Published: 20090709

[30] Priority: EP EP2007150473A 20071228 ...

[No drawing]

Go to Fulltext Get PDF

[57] Abstract: A cement composition, comprises a mixture of a blend of materials including cement and/or micro cement, calcium carbonate, organic fibres, and inorganic fibres; and water; wherein the composition forms a cement that is at least partially soluble in acid and/or water. A method of treating a well, comprises pumping the composition into the well, allowing the cement to set, and treating the set cement so that it is partially to completely dissolved. In case of partial dissolution the residue in time is degradable. The inorganic fiber can be used in the traditional cementing in all stages of the well construction to defeat partial losses and improve the set properties of the final set cement.

[52] US Class:

[51] Int’l Class: C04B001438 C09K0008487 C09K0008467 C04B001606

[52] ECLA: C09K0008467 C04B001446 C04B001446H8 C04B002802 C09K0008487

27 © 2010 MicroPatent, LLC

WO2009083236A1

[57] Claims:

Claims1. A cement composition, comprising a mixture of a blend of materials including cement and/or micro cement, calcium carbonate, organic fibres, and/or inorganic fibres; and water; wherein the cement composition fibres are acid soluble or degradable by hydrolysis 2. A composition as claimed in claim 1, wherein the calcium carbonate has a particle size of less than or equal to 300 microns.3. A composition as claimed in claim 1 or 2, wherein the weight ratio of the cement to calcium carbonate is approximately 1:1 to 1:2.4. A composition as claimed in claim 1, 2 or 3, wherein the cement and calcium carbonate have substantially similar particle sizes.5. A composition as claimed in any preceding claim, comprising calcium carbonate and/or micro-cement with a particle size of less than 15 microns present in an amount of 10-15% by weight of blend; cement present in an amount of 30-35% by weight of blend and calcium carbonate with a particle size of less than to equal 300 microns present in an amount of 50-60% by weight of blend.6. A composition as claimed in claim 5, wherein the calcium carbonate and micro cement have particle sizes less than 15 microns.7. A composition as claimed in any preceding claim, wherein the organic fibres are polylactic acid fibres.8. A composition as claimed in claim 7, wherein the polylactic acid fibres are released from the structure after acidization hydrolysis in the presence of water.9. A composition as claimed in claim 7 or 8, wherein the polylactic acid fibres comprise a blend of different grades of fibre.10. A composition as claimed in claim 7, 8 or 9, wherein the polylactide fibres are of the same or different lengths from 0.5 to 12 mm.11. A composition as claimed in any of claims 7-10, wherein polylactide fibre is present in an amount of 0.1 to 15 lbs per barrel.12. A composition as claimed in claim 11, wherein polylactide (PLA) fibre is present in an amount of 0.5 to 5 lbs per barrel.13. A composition as claimed in claim 12, wherein polylactide (PLA) fibres is present in an amount of 0.5 to 3 lbs per barrel.14. A compositions as claimed in any preceding claim, wherein the inorganic fibres are in the form of nodules.15. A composition as claimed in claim 14, wherein fibres in the nodules are coated with a monomolecular film of surfactant.16. A composition as claimed in claim 14 or 15, wherein the inorganic fibres are mineral oxide fibres.17. A composition as claimed in claim 16, wherein the mineral oxide fibres are

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calcium oxide (CaO) and/or silicon dioxide (Siθ 2) fibres.18. A composition as claimed in any preceding claim, further comprising other solids, density control agents and liquid components for modifying the property of the composition or the set cement produced by the composition.19. A composition as claimed in any preceding claim, wherein magma fibre is present in an amount of 0.1 to 15 lbs per barrel.20. A composition as claimed in 19, where in magma fiber is present in an amount of 0.5 to 5 lbs per barrel.2 1. A composition as claimed in any preceding claim, wherein the organic fibres comprise polyvinyl alcohol fibres.22. A composition as claimed in claim 22, where in the polyvinyl alcohol fibres are present in one length of between 4 - 6 mm, or as a blend of different lengths of 1.5 mm and 4 - 6 mm lengths.23. A composition as claimed in claim 2 1 or 22, wherein polyvinyl alcohol fibre is present in an amount of 0.1 to 7 lbs per barrel.24. A composition as claimed in claim 23, wherein polyvinyl alcohol fibre is present in an amount of 0.5 to 5 lbs per barrel.25. A composition as claimed in claim 24, wherein each polyvinyl alcohol fibres is present in an amount of 0.5 to 3 lbs per barrel.26. A method of treating a well, comprising pumping a composition as claimed in any preceding claim into the well, allowing the cement to set, and treating the set cement so that at least the fibre component is partially or completely dissolved.27. A method as claimed in claim 26, comprising treating the composition with an acid.28. A method as claimed in claim 27, wherein the acid comprises hydrochloric acid.29. A method as claimed in claim 27 or 28, further comprising treating the composition with a solution containing predetermined metallic ions to catalyse dissolution.30. A method as claimed in any of claims 26-29, comprising placing a plug of the composition in a region of the well suffering from fluid loss.31. A method as claimed in any of claims 26-30, wherein both magma fibre and polyvinyl alcohol fibre is present, acid dissolution being completed in one step.32. A method of making a compositions as claimed in any of claims 1 to 25, wherein inorganic fibres are added to the blend before or after the addition of cement.33. A method as claimed in claim 32, wherein the fibre is added before blending with cement.34. A method of making a compositions of as claimed in any of claims 1-25,

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wherein organic fibres are the last ingredient to be added to the composition before it is pumped into a wellbore.

30 © 2010 MicroPatent, LLC