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| Failure Analysis and Measures of Bimetallic Mechanical Composite Pipefor Oil Field |
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| DOI：10.7643/issn.1672-9242.2022.11.018 |
| KeyWord:bimetallic mechanical composite pipe lining failure analysis corrosion |
| Author | Institution |
| ZHANG Jin-xing |
Tarim Oilfield Company, Petro China, Xinjiang Korla , China |
| XIA Xiao-hui |
Tarim Oilfield Company, Petro China, Xinjiang Korla , China |
| SONG Cheng-li |
Tubular Goods Research Institute, CNPC, Shaanxi Xi'an , China |
| LI Xian-ming |
Tarim Oilfield Company, Petro China, Xinjiang Korla , China |
| TAN Chuan-jiang |
Tarim Oilfield Company, Petro China, Xinjiang Korla , China |
| LI Ji-peng |
Tarim Oilfield Company, Petro China, Xinjiang Korla , China |
| LIN Guan-fa |
Tubular Goods Research Institute, CNPC, Shaanxi Xi'an , China |
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| Abstract: |
| The paper aims to study the failure cause of bimetallic mechanical composite pipe and put forward improvement measures. A brief comparison of several typical and common manufacturing methods and their advantages and disadvantages are introduced, and the failure types of the pipes welded by the typical traditional welding process such as girth weld corrosion leakage or pitting, girth weld cracking, lining collapse or bulge, and pipe bursts, are introduced. Using oilfield application failure examples, statistical data and test results, the causes of these failure types are analyzed, and targeted recommendations or measures are put forward. The results show that several typical manufacturing methods of bimetal mechanical composite pipes have their own advantages and disadvantages, but the bonding force between the inner lining and the base pipe of the product is relatively small. The main reasons for the failure of this type of pipe are high pressure and high temperature, CO2/Cl- corrosive medium, the sealing structure and welding process, external anti-corrosion layer construction, stress corrosion or galvanic corrosion, etc. According to the field application practice, suggestions or measures to prevent failures such as pipe end surfacing structure, nickel-based alloy welding material for girth weld, increase of lining thickness and small pipe diameter, etc. have been put forward and applied, and a good protective effect has been achieved. |
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