CASING

Drilling Bits

Ginoil Petroleum EngTexto escrito a mquinaKayfa Haluk

Introduction

Drilling bits selection is crucial to the performance of all drilling projects.

Understanding the different types of bits and their respective applications is a pre-requisite to bit selection.

Not only the right bit in the right application but also running it with the right operating parameters.the right operating parameters.

Well engineers must stay abreast of the latest developments to ensure optimum bit selection.

Bit TypesBit Types

Bit Types

Drill Bits

FixedCutter

RollerCone

InsertMill ToothDiamondP D C

NaturalDiamond

ImpregnatedDiamondT S P

RollerBearing

JournalBearing

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PDC (Polycrystalline Diamond Compact)

Drill Bits

FixedCutter

RollerCone

Use artificially made diamonds

Run successfully with downhole motors

InsertMill ToothDiamondP D C

NaturalDiamond

ImpregnatedDiamondT S P

RollerBearing

JournalBearing

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PDC bit: Elements

1. synthetic diamond cutters

2. support structures for the cutters

3. gauge protection

1

3

2

5

2

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3. gauge protection inserts

4. Depth of cut limiters

5. nozzles.

Steel / Tungsten Carbide

PDC bit: Body Material

Steel body in one piece

High precision simple repair no weld

Tungsten Carbide matrix on steel shell

Erosion resistant

8 mm11 mm13 mm16 mm

19 mm

PDC bit: Cutting Elements

BLADE

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PDC CUTTER

Natural Diamond

Drill Bits

FixedCutter

RollerCone

InsertMill ToothDiamondP D C

NaturalDiamond

ImpregnatedDiamondT S P

RollerBearing

JournalBearing

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Diamond Bit Profiles

Shallow coneParabolicTaper or Double cone

Soft formation=> => => => => Hard formation(More diamond coverage)

Low ROP

Diamond bit : Design

Size and spacing of diamonds determines its use Widely spaced diamonds : large pieces of soft sand and shale Medium spacing of large diamonds: wide range of sand, shale ,

limestone Smaller diamonds set in close pattern: hard formations Smaller diamonds set in close pattern: hard formations

Natural Diamond bit: Elements

Natural Diamonds = hardest mineral

But brittle and Temp dependant

Fluid circulation important

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No cone , operates like a single unit

Sensitive to shock and variation

TSP (Thermally Stable Polycrystalline)

Drill Bits

FixedCutter

RollerCone

InsertMill ToothDiamondP D C

NaturalDiamond

ImpregnatedDiamondT S P

RollerBearing

JournalBearing

Courtesy of

Cutting Elements - TSP

TSP

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Impregnated Diamond

Drill Bits

FixedCutter

RollerCone

InsertMill ToothDiamondP D C

NaturalDiamond

ImpregnatedDiamondT S P

RollerBearing

JournalBearing

Courtesy of