GB/T 40543-2021Petroleum and natural gas industries - Materials selection for high content CO2 for casing, tubing and downhole equipment (English PDF)

1 Scope

This document specifies CO2 gas injection wells and gas production under high pressure and high CO2 (content greater than 10% and partial pressure greater than 1MPa) environment

The guidelines and requirements for material selection of seamless casing and tubing for wells and downhole tools are not within the scope of this document for production wells. This document only considers materials and

Environmental compatibility.

The contents of this document are as follows.

---Corrosion evaluation;

---material selection;

---Corrosion control.

This document applies to wells with high CO2 content, and many requirements also apply to wells with low CO2 content.

Material selection is affected by a variety of factors and mutual synergy, and should be carried out by materials engineers or corrosion engineers.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to the date is applicable to this document; the latest version (including all amendments) of the undated reference standard is applicable to

This document.

ISO 11960 Oil and gas industry oil and gas well casing or tubing steel pipe (Petroleum and naturalgasindustries-

Steelpipesforuseascasingortubingforwels)

ISO 13680 Technical Delivery Conditions of Corrosion-resistant Alloy Seamless Pipe for Casing, Tubing and Coupling Blanks in the Petroleum and Natural Gas Industry (Petroleumandnaturalgasindustries-Corrosion-resistantaloyseamlesstubesforuseascasing,tub- ingandcouplingstock-Technicaldeliveryconditions)

ISO 15156 (all parts) Materials (Petroleumand naturalgasindustries-MaterialsforuseinH2S-containing environmentsinoilandgasproduction)

ISO 23936-1 Non-metallic materials in contact with media related to oil and gas production in the petroleum, petrochemical and natural gas industries-Part 1.Thermal

Plastic plastic (Petroleum, petrochemical and naturalgasindustries-Non-metalicmaterialsin contactwith mediarelatedtooilandgasproduction-Part 1.Thermoplastics)

ISO 23936-2 Non-metallic materials in contact with media related to oil and gas extraction in the petroleum, petrochemical and natural gas industries-Part 2.Projectiles

Sexual body (Petroleum, petrochemical and naturalgasindustries-Non-metalicmaterialsin contactwith mediarelatedtooilandgasproduction-Part 2.Elastomers)

3 Terms, definitions and abbreviations