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| Corrosion Behavior and Life Prediction of High Grade OCTG in Full-life-cycle Environment of High Temperature High Pressure Gas Well |
ZHAO Mifeng1, FU Anqing2( ), HU Fangting1, XIE Junfeng1, LONG Yan2, GENG Hailong1 |
1.Oil and Gas Engineering Research Institute, Petro China Tarim Oilfield Company, Korla 841000, China
2.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China |
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Abstract The corrosion behavior of 140ksi high grade steels, namely the so-called oil country tubular goods (OCTG), in the single environment and multi-consecutive environment in the full-life-cycle of high pressure and high temperature gas wells was systematically studied via high pressure and high temperature corrosion testing system. The results showed that the decreasing trend of corrosion rates of 140ksi high grade OCTG steels in both single environment tests and multi-consecutive environment tests could be ranked as follows: CRfresh acid＞CRused acid＞CRformation water＞CRcondensate water, and some “genetic effects” were also observed in the multi-consecutive environment tests. The corrosion rates of 140ksi high grade OCTG steels decreased with the increase of test time in the formation water for both single environment tests and multi-consecutive environment tests, which tended to be stable after 60 d exposure. Based on the pitting rates, the service life of 140ksi high grade OCTG steels under different corrosion conditions was calculated using the finite element method.
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Received: 01 August 2020
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| Fund: National Key Research and Development Project(2019YFF0217502);CNPC Science and Technology Key Project(2018E-1809) |
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Corresponding Authors:
FU Anqing
E-mail: fuanqing@cnpc.com.cn
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About author: FU Anqing, E-mail: fuanqing@cnpc.com.cn
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