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Shuanlu L.,China University of Petroleum - East China | Zhen W.,China University of Petroleum - East China | Yanjun K.,Drilling Technology Office | Zhenbiao W.,Drilling Technology Office | And 4 more authors.
Well Testing | Year: 2010

Less than one month of production test after the completion of a horizontal well, workover has to implement for abnormal. By investigating reason of pressure increase of casing in detail and examining the pipeline one by one, it is found that many of tubing nipple to be severe corrosion and discoloration, almost all the tubing tube body, the outer surface of both are of corrosion and most of the oil pipe are gluing. According to characteristics of pipeline failure, the reason of increased case pressure is due to leakage of pipe joints, the pipe joint leakage is mainly caused by gluing. Further analysis shows that pipeline galling is mainly caused by improper operation, and tubing corrosion mainly caused by CO2, Cl- and condensate water of the natural gas. Source

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