摘要
塔里木盆地缝洞型碳酸盐岩地层溶洞发育,钻井过程中易导致溢漏同时发生,压力控制困难,钻井和井控安全存在极大挑战,亟需研究钻遇定容体时的气液置换规律和定容体内压力变化规律。定容体气液置换过程中伴随着钻井液漏失与气体进入井筒,两相流相场法能够模拟气液置换界面和定容体内压力变化特征。基于两相流相场法,研究了钻遇定容体时的气液置换规律;与现场数据对比,验证了该方法对钻遇定容体时气液置换规律模拟的可靠性;并模拟分析了钻遇不同定容体体积、钻遇深度和漏失压差工况下的压力变化特征与气液置换规律。模拟结果表明,漏失相同体积分数钻井液时,随着定容体体积增大,侵入井筒气量增多;随着定容体深度增深,侵入井筒气量增多;随着初始漏失压差增大,侵入井筒气量显著降低;高初始漏失压差条件下钻遇定容体时,易出现失返性漏失。研究结果为现场钻遇定容体时制定处理方案提供了理论依据。
The Tarim fracture-cave carbonate formation has developed karst caves,which are prone to overflow and leakage during drilling,making pressure control difficult and posing great challenges to drilling and well control safety.It is urgent to study the gas-liquid displacement law and pressure change law when encountering a constant volume body during drilling.During the gas-liquid displacement process of the constant volume body,drilling fluid leakage and gas enter the wellbore.The two-phase flow phase-field method can effectively simulate the characteristics of the gas-liquid displacement interface and pressure changes in the constant volume body.Based on the two-phase flow phase-field method,the gas-liquid displacement law when drilling into a constant volume body was studied.Compared with on-site data,the reliability of this method in simulating the gas-liquid displacement law when drilling into a constant volume body was verified.The pressure variation characteristics and gas-liquid displacement laws were simulated and analyzed under different volumes of constant volume body,drilling depths,and leakage pressure differences.The results indicate that as the volume of the constant volume body increases,the amount of gas entering the wellbore increases when the same volume fraction of drilling fluid is lost.A greater amount of gas enters the wellbore when there is a deeper constant volume body.An increase in initial leakage pressure difference can lead to a significant decrease in the amount of gas entering the wellbore.When encountering a constant volume body during drilling under high initial leakage pressure difference conditions,it is prone to backflow leakage.The research results provide a theoretical basis for the development of treatment plans when encountering constant volume body during on-site drilling.
作者
邵长春
张绪亮
刘啸宇
袁野
段纪斌
高永海
SHAO Changchun;ZHANG Xuliang;LIU Xiaoyu;YUAN Ye;DUAN Jibin;GAO Yonghai(CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development,Korla,Xinjiang,841000,China;Engineering Research Center for Ultra-Deep Complex Reservoir Exploration and Development,Xinjiang Uygur Autonomous Region,Korla,Xinjiang,841000,China;Xinjiang Key Laboratory of Ultra-Deep Oil and Gas,Korla,Xinjiang,841000,China;PetroChina Tarim Oilfield Company,Korla,Xinjiang,841000,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,China)
出处
《石油钻探技术》
北大核心
2025年第6期109-119,共11页
Petroleum Drilling Techniques
基金
国家自然科学基金基础科学中心项目“超深特深层油气钻采流动调控”(编号:52288101)
中国石油天然气股份有限公司塔里木油田分公司攻关项目“超深大斜度井、水平井溢流机理、运移规律及控制措施研究”(编号:671023115017)联合资助。
关键词
碳酸盐岩
定容体
气液置换
两相流相场法
压力
carbonate
constant volume body
gas-liquid displacement
two-phase flow phase-field method
pressure
