Expert systems for materials selection or

tailoring in the design of O&G equipment

Salimon A., National University of Science and Technology “MISiS”,

Center for Composite Materials

Ashby’ method in material selection.

Performance analysis

Slide 2

Expert systems for materials selection or tailoring in the design of O&G

equipment. Salimon A

Materials are interesting as the combination of useful consumer properties - attributes.

Materials can’t be separated from their available Shapes and applicable Processes a) to produce (synthesize); b) to shape; c) to join (assembly); d) to finish.

Optimal rational selection of a Material for an Application (a component) starts form the analysis of Function, Objective and Constraints.

Ashby’ method in material selection.

Performance analysis

Slide 3

Function What does component do ?Examples: Withstand concentrated or distributed load (force), conduct electric current, insulates volume from heat fluxes etc.

Objective What is to be maximized or minimized?Examples: Minimize cost, mass, eco-impact; maximize safety, energy content, service life.

Constraints a) What are non-negotiable conditions to be satisfied? b) What are compromise or desirable conditions?

Examples: a) Geometry specified, service temperature or medium;

b) stiffness, strength, cost.

Expert systems for materials selection or tailoring in the design of O&G

equipment. Salimon A

Slide 4Expert systems based on DB applications

Expert systems for materials selection or tailoring in the design of O&G

equipment. Salimon A

All Materials in DB

Filtering (applying non-negotiable

constraints)

Ranking (by material indices)

Expertize and testing

Final Choice

Number of

candidates

Slide 5

Material Selection for OWT

Slide 6

Material Selection for OWT

Function OWT – strong support loaded in expansion

Objective (possible) а) min cost; b) min mass; c) mах service life;

d) mах length for deep wells.

Constraints a)Operational temperature at least +150 С, +200 С, +300

С … Medium pH 2…12, organic solvents, H2S, СО2 Abrasive wear,

cavitation … Low temperature resistance -60 С Geometry specified

b) OWT must not failure under own weight and/or as a result of corrosion.

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Material Selection for OWT. Minimal Cost

Strength over unit

cost.

No filters for rigid

constraints.

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Material Selection for OWT. Minimal Cost

Strength over unit cost. Filtering

over durability in salt water, weak

acids and alkalis and organic

solvent.

Slide 9

Material Selection for OWT. Minimal mass

Strength over unit

mass.

No filters for rigid

constraints.

Slide 10

Material Selection for OWT. Minimal mass

Strength over unit mass.

Filtering over durability in

salt water, weak acids and

alkalis and organic solvent.

Slide 11

Material Selection for OWT. Minimal mass

Expert systems for materials selection or tailoring in the design of O&G

equipment. Salimon A

Strength over unit

mass at +200 C

Modern materials for O&G equipment – real life and future

• Economical issues are currently dominating – mainly low alloyed and stainless

steels are applied worldwide, although with special coatings. Al alloys – limited

applications.

• Operational costs, logistics, special well conditions may put forward wider use of

Al alloys, start with Ti, Mg and Ni alloys and modern composites – GFRP and

CFRP based on PEEK and PPS, carbon-based materials.

• Principal trend - hybrid and composite materials purposely designed in

collaboration of designers and materials science engineers.

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Expert systems for materials selection or tailoring in the design of O&G

equipment. Salimon A

Thank you for attention !!!

Welcome to collaborate.

Acknowledgment to Granta Design, Cambridge, UK

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Expert systems for materials selection or tailoring in the design of O&G

equipment. Salimon A