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Steel grades below 150ksi produced by CPE units are CO resistant 2 Preparation process for corroded oil well pipes

A preparation process and technology for oil well pipes, which are applied in the field of steel for oil well pipes

Active Publication Date: 2016-08-17
JIANGSU CHANGBAO STEELTUBE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art, and provide a kind of anti-CO 2 The preparation process of corroded oil well pipe, the steel pipe rolled by this process has good surface quality, high dimensional accuracy, especially good wall thickness uniformity and ovality, which can effectively improve the collapse resistance of the pipe body; secondly, due to the The pipe technology belongs to the long-elongation longitudinal rolling. The steel pipe produced has good microstructure and performance, is not easy to produce defects, and is also conducive to improving the CO2 resistance of the steel pipe. 2 Corrosion performance: adopt quenching and tempering heat treatment, the mechanical properties of the steel pipe can reach 150ksi, suitable for deep and ultra-deep well mining

Method used

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  • Steel grades below 150ksi produced by CPE units are CO resistant <sub>2</sub> Preparation process for corroded oil well pipes
  • Steel grades below 150ksi produced by CPE units are CO resistant <sub>2</sub> Preparation process for corroded oil well pipes
  • Steel grades below 150ksi produced by CPE units are CO resistant <sub>2</sub> Preparation process for corroded oil well pipes

Examples

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Embodiment 1

[0029] The steel pipe finished product specifications of the present embodiment:

[0030] Tube specifications:

[0031] Tube blank material: 5Cr;

[0032] Anti-CO produced by CPE unit 2 The general steps of the manufacturing process of corroded oil well pipe are: peeling of tube blank → tube blank cutting, cold centering → tube blank preheating → ring furnace heating → tube blank piercing → capillary tube piercing mandrel, necking → pipe jacking → loose rod →Rod stripping→Hot sawing→Reheating→Phosphorization removal by high pressure water→Tension reduction→Cooling bed cooling→Inspection and grinding→Pickling→Reinspection and grinding→Lubrication, phosphating→Cold rolling→Quenching and tempering heat treatment→Straightening→ Finishing→Packing into storage.

[0033] The preparation process of the anti-CO2 corrosion oil well pipe produced by the CPE unit, the specific steps of the process are as follows:

[0034] (1) According to the mass percentage ratio of each componen...

Embodiment 2

[0056] The anti-CO produced by the CPE unit of this embodiment 2 The preparation process of the corroded oil well pipe is basically the same as that of the first embodiment, the difference is that in the step (1), its components and the mass percentages of each component are as follows:

[0057] C: 0.16%; Si: 0.3%; Mn: 0.85%; Cr: 5.29%; Mo: 0.45%; Al: 0.031%; Ni: 0.18%; 100%.

[0058] The anti-CO prepared by the process of this embodiment 2 The corroded oil well pipe reaches 110ksi steel grade, with high dimensional accuracy and good surface quality. The mechanical properties are as follows: yield strength 861MPa, tensile strength 950MPa, and elongation 15%.

Embodiment 3

[0060] The anti-CO produced by the CPE unit of this embodiment 2 The preparation process of the corroded oil well pipe is basically the same as that of the first embodiment, the difference is that in the step (1), its components and the mass percentages of each component are as follows:

[0061] C: 0.18%; Si: 0.2%; Mn: 0.8%; Cr: 5.0%; Mo: 0.05%; Al: 0.02%; B: 0.0005%;

[0062] The anti-CO prepared by the process of this embodiment 2 The corroded oil well pipe reaches 130ksi steel grade, with high dimensional accuracy and good surface quality. The mechanical properties are as follows: yield strength 972MPa, tensile strength 1051MPa, and elongation 16%.

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Abstract

The invention discloses a preparation process of an anti-CO2-corrosion oil well pipe with a steel grade of less than 150ksi produced by a CPE unit. The process comprises the following steps: smelting each component by virtue of a converter according to the mass percentage proportion of each component, and performing continuous casting and continuous rolling on molten steel which is smelted by the converter to prepare a pipe billet, wherein the pipe billet comprises the following components in percentage by mass: 0.13-0.23% of C, 0.11-0.41% of Si, 0.8-1.0% of Mn, 5.0-6.0% of Cr, 0.05-0.45% of Mo, 0.02-0.04% of Al and the balance of Fe and inevitable impurities, and the total mass percentages are 100%. A steel pipe rolled by virtue of the process disclosed by the invention is good in surface quality and high in size precision, the anti-collapse performance of a pipe body can be effectively improved, the improvement of the anti-CO2-corrosion performance of the steel pipe can also be facilitated, the mechanical performance of the steel pipe can reach less than 150ksi, and the steel pipe is suitable for mining application of deep wells and ultra deep wells.

Description

technical field [0001] The invention relates to a CO2-resistant steel grade below 150ksi produced by a CPE unit 2 The invention discloses a preparation process for corroded oil well pipes, belonging to the technical field of steel for oil well pipes. Background technique [0002] At present, with the intensification of my country's oil and gas development, oil well casings and oil pipes for collecting oil and gas are facing high temperature, high pressure, and high CO content. 2 , Cl-, etc. coexist in a strong corrosive environment, resulting in multiple downhole tubing breaks in oil and gas fields, and leakage accidents in gas gathering trunks, resulting in many oil and gas field wells being scrapped ahead of schedule due to such problems after being put into production for about one year, causing huge losses and bringing great harm to the people. People's lives and property safety have caused serious harm, and it has also threatened the national energy strategy security. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C21D8/10
CPCC21D8/105C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18
Inventor 李珺敬磊郭兴邦郭照生
Owner JIANGSU CHANGBAO STEELTUBE CO LTD
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