渤中井壁坍塌失稳流固热化耦合模型及应用  

Fluid-Solid-Thermal-Chemical Coupling Model for Wellbore Instability of Directional Wells in Central Bohai Sea and Its Application

作　　者：曹文科 幸雪松 周长所 朱海燕 CAO Wenke;XING Xuesong;ZHOU Changsuo;ZHU Haiyan(School of oil and Natural Gas Engineering,Changzhou University,Changzhou,Jiangsu 213164,China;College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Drilliing and Production Research Intitute,CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)

机构地区：[1]常州大学石油与天然气工程学院,江苏常州213164 [2]成都理工大学能源学院,四川成都610059 [3]中海油研究总院钻采研究院,北京100028

出　　处：《西安石油大学学报（自然科学版）》2024年第5期71-77,84,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金(51904037)。

摘　　要：为研究井眼井斜角、方位角及地层水化作用时间对井周失稳区域的影响规律,基于流-固-热-化耦合和塑性理论,运用有限元数值模拟方法对泥页岩地层井周塑性失稳区域的分布规律进行了分析。研究表明:定向井具有更高的失稳风险,井眼的井斜角和水化时间是影响层理性泥页岩地层井眼稳定性的重要因素,其中当井眼井斜角超过30°后,井周失稳区域显著增大,而井眼方位角对井筒最终的失稳区域分布影响不显著。相关研究对泥页岩地层井眼的井眼轨迹设计具有工程指导意义。To study the influence of wellbore inclination angle,azimuth angle,and formation hydration time on the instability zone around the wellbore,based on fluid-solid-thermal-chemical coupling and plasticity theory,the distribution pattern of plastic instability zone around the wellbore in shale formation was analyzed using finite element numerical simulation method.The result shows that,directional wells have a higher risk of instability,and the wellbore inclination angle and hydration time of shale formation are important factors affecting the stability of bedding shale formation.When the wellbore inclination angle exceeds 30°,the instability area around the wellbore significantly increases,while the wellbore azimuth angle has no significant effect on the distribution of the final instability area around the wellbore.The research result has engineering guidance significance for wellbore trajectory design in shale formation.

关 键 词：泥页岩 井眼轨迹 井壁坍塌 井壁稳定 多场耦合 

分 类 号：TE24[石油与天然气工程—油气井工程]