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某水平井套管开裂失效实验及数值模拟研究
Test and Numerical Simulation Research of Casing Crack Failure in Horizontal Wells
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- DOI:
- 作者:
- 王 蕊，张 乐，闫晓峰，韩 东，杨 鹏
WANG Rui1 , ZHANG Le1 , YAN Xiaofeng2 , HAN Dong2 , YANG Peng1
- 作者单位:
- 1. 中国石油集团工程材料研究院有限公司，陕西 西安 710077；2. 长庆油田分公司 第六采气厂，陕西 西安 710018
1. CNPC Tubular Goods Research Institute, Xi'an 710077, China; 2. Changqing Oilfield Branch No. 6 Gas Production Plant, Xi'an 710018, China
- 关键词:
- 水平井套管；腐蚀；缺陷；开裂；有限元模拟
horizontal well casing; corrosion; defect; crack; finite element simulation
- 摘要:
- 通过分析水平井套管现场服役工况，并结合宏观观察、理化性能检测、组织分析、扫描电镜观察和能谱分析
等实验研究及数值计算方法，系统分析了水平井套管发生开裂失效的原因。 结果表明，套管材料性能满足标准要求，但
套管内壁存在大量腐蚀坑，套管在酸化压裂过程中发生点蚀。 断口分析表明，裂纹起源于腐蚀坑底，套管内部存在非金
属夹杂缺陷。 通过数值模拟计算，分析了套管在完整及含缺陷状态下的承压能力，套管在腐蚀和缺陷作用下承压能力极
大降低。 当缺陷深度为 0.5 mm、内压 47 MPa 时，套管在 52 MPa 压裂过程中沿原始缺陷方向发生开裂失效，与套管在压
裂作业过程中失效情况相符。 依据所得研究结果提出避免此类失效事故的建议。
By analysing the working conditions of horizontal well casings and combining experiments and numerical simulations, such as macroscopic observation, physical and chemical property test, microstructure analysis, SEM and energy spectrum analysis, the causes of casing cracking failure in horizontal wells were systematically analysed. The results show that the properties of the casing material meet the requirements of the standard. However, a lot of corrosion pits are found on the inner wall of the casing, and pitting corrosion occurs in the casing during acid fracturing. The fracture analysis shows that the crack originates from the bottom of the corrosion pit, and there are nonmetallic inclusions in the casing. Through the numerical simulation, the pressure bearing capacity of the casing under complete and defective conditions is analysed, which is greatly reduced under corrosion and defects. When the defect depth is 0.5 mm and the internal pressure is 47 MPa, the casing cracks fail along the original defect direction during 52 MPa fracturing, which is consistent with the failure during fracturing operation. Based on the results of the study, some suggestions are put forwards to avoid such failure accidents.