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Failure analysis method for fiber-reinforced flexible composite oil pipe

A composite tubing and fiber-reinforced technology, which is applied in the analysis of materials, strength characteristics, and material thermal analysis, can solve problems such as unsystematic and blind failure analysis of non-metallic composite tubing, and achieve easy implementation, easy reference and use, and simple methods Effect

Pending Publication Date: 2021-06-08
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

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a method for failure analysis of fiber-reinforced flexible composite oil pipes; this method can solve the existing problems of blind and unsystematic failure analysis of non-metallic composite oil pipes

Method used

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  • Failure analysis method for fiber-reinforced flexible composite oil pipe
  • Failure analysis method for fiber-reinforced flexible composite oil pipe
  • Failure analysis method for fiber-reinforced flexible composite oil pipe

Examples

Experimental program
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Effect test

example 1

[0039] Example 1: Determining the cause of failure of polyester fiber reinforced flexible composite tubing in service in a high temperature environment (45°C) in an oilfield

[0040] (1) Select the pipe material and preparation work required for the test. Randomly select 4 pipes from the same batch as the field service, and 1 pipe is a group, numbered 1#, 2#, 3#, 4# respectively. (2) Carry out the test of simulated temperature. Select 0°C, 25°C, 45°C and 65°C temperature points for insulation. The distribution of temperature points includes extreme temperature points of 0°C, 65°C and service temperature of 45°C. (3) Short-term hydraulic failure test. According to the standard GB / T 15560-1995, the blasting test is carried out on the pipes 1#, 2#, 3# and 4# of the prefabricated failure mode, and the short-term hydraulic failure strength is tested, and the value is obtained, 1#, 2#, 3# , 4# composite pipe short-term hydraulic failure strength values ​​are 29MPa, 26MPa, 21MPa ...

example 2

[0041] Example 2: Judgment of the cause of failure of aramid fiber reinforced flexible composite tubing in service in a high temperature environment (45°C) in an oilfield

[0042] (1) Select the pipe material and preparation work required for the test. Randomly select 4 pipes from the same batch as the field service, and 1 pipe is a group, numbered 1#, 2#, 3#, 4# respectively. (2) Carry out the test of simulated temperature. Select 0°C, 25°C, 45°C and 65°C temperature points for insulation. The distribution of temperature points includes extreme temperature points of 0°C, 65°C and service temperature of 45°C. (3) Short-term hydraulic failure test. According to the standard GB / T 15560-1995, the blasting test is carried out on the pipes 1#, 2#, 3# and 4# of the prefabricated failure mode, and the short-term hydraulic failure strength is tested, and the value is obtained, 1#, 2#, 3# , 4# composite pipe short-term hydraulic failure strength values ​​are 26MPa, 30MPa, 29MPa and...

example 3

[0043] Example 3: Judging the cause of failure of aramid fiber reinforced flexible composite tubing in an oilfield in high temperature environment (45°C) for one year

[0044] (1) Select the pipe material and preparation work required for the test. Randomly select 4 pipes from the same batch as the field service, and 1 pipe is a group, numbered 1#, 2#, 3#, 4# respectively. (2) Carry out the test of simulated temperature. Select 0°C, 25°C, 45°C and 65°C temperature points for insulation. The distribution of temperature points includes extreme temperature points of 0°C, 65°C and service temperature of 45°C. (3) Short-term hydraulic failure test. According to the standard GB / T 15560-1995, the blasting test is carried out on the pipes 1#, 2#, 3# and 4# of the prefabricated failure mode, and the short-term hydraulic failure strength is tested, and the value is obtained, 1#, 2#, 3# , 4# composite pipe short-term hydraulic failure strength values ​​are 26MPa, 30MPa, 29MPa and 29M...

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Abstract

The invention discloses a failure analysis method for fiber-reinforced flexible composite oil pipe. The failure analysis method takes influence factors of conventional fiber-reinforced flexible composite oil pipes into consideration, takes factors such as temperature, tension and scratch into consideration, and ranks the factors from large to small according to the possibility of failure factors in the actual application process. Compared with an existing fiber-reinforced flexible composite oil pipe failure analysis method, the failure analysis method has the advantages that the failure morphology is simulated by effectively combining the field temperature and working condition analysis form and the prefabrication defects, the method is simple and convenient to implement, and the failure reason of the fiber-reinforced flexible composite oil pipe can be rapidly and accurately judged; and a test method related in the invention is reasonable in design, only water pressure blasting equipment, temperature control equipment and a universal testing machine are involved in the test process, and the test operation is performed according to the national standard.

Description

【Technical field】 [0001] The invention belongs to the field of failure analysis of pipes in the petroleum and natural gas industries, and relates to a method for failure analysis of fiber-reinforced flexible composite oil pipes. 【Background technique】 [0002] Due to the presence of a large number of corrosive substances in the transmission medium, such as CO 2 、H 2 S, Cl -1 , a small amount of dissolved oxygen and bacteria, etc., the oil pipe must suffer severe corrosion. Tubing corrosion can lead to perforation, tripping, and fracture of the tubing body, resulting in reduced tubing life, frequent replacement, and reduced oil production efficiency. Corrosion has become a key factor affecting the reliability and service life of pipeline systems, and is the most important cause of pipeline accidents. [0003] Fiber-reinforced flexible composite oil pipe has the advantages of good flexibility, light weight, corrosion resistance, anti-fouling, small resistance to conveying ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/12G01N3/313G01N25/00
CPCG01N3/08G01N3/12G01N3/313G01N25/00
Inventor 蔡雪华齐国权戚东涛张冬娜李厚补
Owner BC P INC CHINA NAT PETROLEUM CORP
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