Abstract
Abnormal oil casing pressure appeared in the process of test production of multiple Ultra-Deep Gas Wells in Tarim Basin. The super 13Cr oil pipe string was used to analyze the causes of pipe string failure in view of the oil casing channeling well during the test and blowout period. The construction process of the well was analyzed in detail. Combined with the review of the operation flow and the detection of fracture string material and fracture morphology, the causes of pipe string fracture were analyzed and calculated in detail. Through field investigation, analysis and calculation, it was found that the main cause of cracking of super 13Cr tubing in this well is the decrease of vibration natural frequency caused by excessive fluid velocity in pipe and too long span of pipe string. At the same time, the mixed failure of stress corrosion cracking and stress load interaction occurred in Cl−1 environment and other corrosion environments.
Highlights
The fracture failure of pipe string is one of the main forms of pipe string failure in oil and gas wells
Analysis and calculation, it was found that the main cause of cracking of super 13Cr tubing in this well is the decrease of vibration natural frequency caused by excessive fluid velocity in pipe and too long span of pipe string
The existing literature focuses on the fracture failure of oil and gas well string, which is generally attributed to the vibration failure of pipe string [3] or corrosion cracking [4]
Summary
The fracture failure of pipe string is one of the main forms of pipe string failure in oil and gas wells. The existing literature focuses on the fracture failure of oil and gas well string, which is generally attributed to the vibration failure of pipe string [3] or corrosion cracking [4]. Combined with the field working conditions and related parameters, the vibration mechanism and corrosion mechanism of pipe string fracture are studied, and the causes of fracture on the outer surface of the well string are discussed
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