| 引用本文: | 廖云虎,李力,郑华安,贾辉,王闯,朱彤宇,等. 南海气井环空带压诊断与封堵体系性能评价[J]. 石油与天然气化工, 2025, 54(3): 102-107,152. |
| |
|
| 本文已被：浏览 15次 下载 12次 |
码上扫一扫！ |
|
|
| 南海气井环空带压诊断与封堵体系性能评价 |
|
廖云虎1,2, 李力1,2, 郑华安1,2, 贾辉1,2, 王闯1,2, 朱彤宇3, 郑玉飞3
|
|
1.中海石油（中国）有限公司海南分公司;2.中国海油南海油气能源院士工作站;3.中海油田服务股份有限公司油田生产事业部
|
|
| 摘要: |
| 目的 针对南海某平台X气井环空带压原因复杂、识别不清问题，开展了气中环空带压诊断与封堵体系性能评价。方法 利用泄压-恢复曲线及气体组成分析对环空带压进行诊断和确定漏点位置，并采用多因素耦合环空带压诊断模型对漏点参数进行定量表征。结合环空带压诊断结果，通过黏度、固化时间、抗压强度、胶结强度、封堵性能等性能评价实验，优选得到适用于气井的化学封堵体系。结果 X气井A环空为密闭环空带压、B环空为持续环空带压，其中，B环空水泥环平均渗透率约为33×10-3 μm2，具有明显窜流通道，若其他井屏障存在大于10 mm的泄漏孔径，则井筒完整性风险等级为中风险。针对水泥环窜流问题，优选了注入性能良好、抗压强度和胶结强度均较高的WS-1树脂类封堵体系，封堵强度大于15 MPa/m，具有良好的封堵能力。结论 研究结果可为海上气井环空带压问题治理提供科学依据，同时对于气井产量调控和井筒完整性管理具有重要参考意义。 |
| 关键词: 环空带压 诊断模型 水泥环窜流 化学封堵体系 |
| DOI：10.3969/j.issn.1007-3426.2025.03.014 |
| 分类号: |
| 基金项目:中国海洋石油有限公司综合科研项目“高温高压气井增产与治理关键技术研究”（KJZH-2023-2204）。 |
|
| Diagnosis of annular pressure and performance evaluation of plugging system for the gas well in the South China Sea |
|
LIAO Yunhu1,2, LI Li1,2, ZHENG Huaan1,2, JIA Hui1,2, WANG Chuang1,2, ZHU Tongyu3, ZHENG Yufei3
|
|
1.CNOOC (China) Co., Ltd. Hainan Branch, Haikou, Hainan, China;2.CNOOC South China Sea Oil & Gas Energy Academician Workstation, Haikou, Hainan, China;3.Production Optimization Business Division of China Oilfield Services Limited, Tianjin, China
|
| Abstract: |
| Objective In view of the complicated and unclear reasons for the annular pressure of X gas well on a certain platform in the South China Sea, a diagnosis of annular pressure and performance evaluation of plugging system was carried out. Method The depressurization-pressure recovery curve and gas components analysis were used to diagnosis the annular pressure and identify the leakage point location, and the multi-factor coupled with annular pressure diagnosis model was used to quantitatively characterize the parameters of leakage point. Based on the results of the annular pressure diagnosis, the chemical plugging system suitable for gas wells was optimized through the evaluation experiments of viscosity, curing time, compressive strength, cementation strength and plugging performance. Result The A annulus of X gas well was thermodynamic trapped annulus pressure, and the B annulus was sustained annular pressure. The average permeability of the B annulus cement ring was about 33×10-3 μm2, and there existed a significant channel. If other well barriers have a leakage aperture greater than 10 mm, the well integrity risk level is medium risk. In order to solve the problem of channeling in a cement ring, a WS-1 resin plugging system with good injection performance, high compressive strength and bonding strength was selected, and the plugging pressure difference was greater than 15 MPa/m, which had good plugging ability. Conclusion The research findings can provide a scientific basis for addressing annular pressure issues in offshore gas wells, while also offering valuable references for gas production regulation and wellbore integrity management. |
| Key words: annulus pressure diagnosis model cement ring channeling chemical plugging system |
