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Air-cooling type 80H thermal production well casing based on strain design and production process thereof

A thermal recovery well and air-cooling technology, which is applied in the field of oil pipes, can solve problems such as oil casing pipe safety hazards, plastic strain accumulation damage, etc., and achieve the effects of improving resistance to high temperature permanent deformation, reducing plastic deformation, and reducing casing damage

Inactive Publication Date: 2015-06-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, in order to improve the strength of the oil casing developed by the thermal recovery well of heavy oil, the plastic deformation behaviors such as casing fracture, screw connection slippage and deformation caused by thermal stress are mainly considered, and the thermal strength and thermal stability of the pipe are improved to solve the problem. However, the cumulative damage of plastic strain caused by the tension-compression cyclic load caused by thermal stress is not considered, so there are potential safety hazards in the oil casing pipes in service

Method used

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  • Air-cooling type 80H thermal production well casing based on strain design and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The air-cooled 80H thermal recovery well casing provided based on the strain design provided in Example 1 of the present invention has the mass percentages of the chemical components of the materials as follows:

[0015] C: 0.20%, Mn: 1.15%, Si: 0.42%, P: <0.011%, S: <0.004%, Cr: 0.99%, Mo: 0.22%, Ni: 0.03%, Nb: 0.016%, Al: 0.012 %, B: 0.001%, the rest is the matrix element iron.

[0016] The effect of each component in the material of the air-cooled 80H thermal recovery well casing provided based on casing string strain design provided in Example 1 of the present invention is as follows:

[0017] The role of the C element is mainly to increase the strength. Under the premise of ensuring the necessary strength of the steel, the carbon content should be reduced as much as possible to improve the plasticity and toughness of the material.

[0018] The addition of the Mn element not only plays a role of solid solution strengthening, but also can refine the structure of the...

Embodiment 2

[0041] The air-cooled 80H thermal recovery well casing provided based on the strain design provided by Embodiment 2 of the present invention has the mass percentages of the chemical components of the materials as follows:

[0042]C: 0.21%, Mn: 1.22%, Si: 0.43%, P: <0.011%, S: <0.004%, Cr: 0.96%, Mo: 0.23%, Ni: 0.032%, Nb: 0.014%, Al: 0.016 %, B: 0.0012%, and the rest is the matrix element iron.

[0043] In the production process of the air-cooled 80H thermal recovery well casing based on the strain design provided by Embodiment 2 of the present invention, in the heat treatment process, after the austenite is deformed and relaxed in the non-recrystallized zone for 25s, air cooling is adopted; cooling The speed is controlled at 8°C / s.

[0044] The test results of the characteristic parameters of the air-cooled 80H thermal recovery well casing based on the strain design provided in Example 2 of the present invention are as follows:

[0045] Yield strength σ s =627MPa;

[0046...

Embodiment 3

[0052] The air-cooled 80H thermal recovery well casing provided based on the strain design provided by Example 3 of the present invention has the mass percentages of the chemical components of the materials as follows:

[0053] C: 0.22%, Mn: 1.06%, Si: 0.42%, P: <0.011%, S: <0.004%, Cr: 0.95%, Mo: 0.25%, Ni: 0.032%, Nb: 0.014%, Al: 0.013 %, B: 0.001%, the rest is the matrix element iron.

[0054] In the production process of the air-cooled 80H thermal recovery well casing based on the strain design provided by Embodiment 2 of the present invention, in the heat treatment process, after the austenite is deformed and relaxed in the non-recrystallized zone for 30 seconds, air cooling is used; cooling The speed is controlled at 10°C / s.

[0055] The test results of the characterization parameters of the air-cooled 80H thermal recovery well casing based on the strain design provided in Example 3 of the present invention are as follows:

[0056] Yield strength σ s =629MPa;

[0057...

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Abstract

The invention discloses an air-cooling type 80H thermal production well casing based on a strain design and production process thereof. The material of the air-cooling type 80H thermal production well casing comprises the following chemical constituents in percentage by mass: 0.20-0.22% of C, 1.0-1.25% of Mn, 0.40-0.50% of Si, less than 0.011% of P, less than 0.004% of S, 0.90-1.0% of Cr, 0.20-0.25% of Mo, 0.03-0.04% of Ni, 0.01-0.02% of Nb, 0.01-0.02% of Al, 0.001-0.0015% of B, and the balance of matrix element iron. The invention further discloses the production process for the casing. The production process comprises the following steps of: heat treatment and cooling. The resistance of the casing to high-temperature permanent deformation can be improved, and casing damages can be reduced, and then the safe reliability of the thermal production well casing during a service process can be improved.

Description

technical field [0001] The invention relates to the technical field of oil pipes, in particular to an air-cooled 80H thermal recovery well casing designed based on strain and a production process thereof. Background technique [0002] my country has rich reserves of heavy oil resources, which are widely distributed. Onshore heavy oil and bitumen resources account for more than 20% of the total oil resources. The average temperature of steam injection thermodynamic method, which has a better application effect and is the most widely used in heavy oil development, is 320°C, and the highest is 375°C. During the process of steam injection and oil production, the casing is subject to periodic compressive-tensile stress, which causes casing damage in the form of fracture of service casing, slippage of threaded connection, deformation, etc. According to relevant statistics, the casing damage rate of N80 and P110 heavy oil thermal recovery wells exceeds 30%, and reaches 70% in some...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C21D9/08E21B17/00
Inventor 王航
Owner BC P INC CHINA NAT PETROLEUM CORP
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