摘要
蒸汽吞吐是稠油开发的重要手段,然而蒸汽吞吐过程井周岩石变形破坏分析涉及温度、渗流及应力等多个复杂物理场的耦合。为了准确描述注蒸汽开发过程中的流-固-热耦合变化过程,考虑流-固-热耦合效应,将渗流力学、岩石力学及热力学结合起来,建立了稠油热采油藏热-流-固耦合计算模型,定量分析了储层热采井井周孔隙压力场与温度场动态变化规律,进而确定了水平井蒸汽辅助重力泄油(SAGD)双水平井的安全侧钻距离。分析结果表明:储层安全侧钻距离的确定需要综合考虑注汽导致的孔隙压力升高与注采导致的岩石性质劣化2方面因素;侧钻水平井加密一般在高轮次蒸汽吞吐后进行,3轮次蒸汽吞吐后,超过120℃的区域半径为16. 0～17. 5 m,因此建议水平方向侧钻加密井的安全侧钻距离超过17. 5 m。所得结论可为稠油热采井钻井工程设计提供参考。
Steam stimulation is an important means for heavy oil recovery.The analysis of deformation and failure of formation around wellbore during steam stimulation involves the coupling of multiple physical fields of temperature,seepage and stress.In order to accurately describe the flow-solid-thermal coupling change process in the steam stimulation development process,considering the fluid-solid-thermal coupling effect and combining the seepage mechanics,rock mechanics and thermodynamics,the flow-solid-thermal coupling model for heavy oil thermal recovery reservoir is established.The changes of the pressure field and temperature field around the thermal recovery wellbore have been quantitatively analyzed to determine the safe sidetracking distance of the dual SAGD horizontal well.The analysis results show that the determination of the safe sidetracking distance should take into account the increase of pore pressure and the deterioration of rock properties caused by steam injection.Sidetracking of horizontal well is usually carried out after high-cycle steam stimulation.After 3 rounds of steam stimulation,the radius of the area exceeding 120℃is about 16.0 to 17.5 m.It is recommended that the sidetracked horizontal drilling infill well has a safe sidetrack distance of more than 17.5 m.The study could provide references for the design of heavy oil thermal recovery well drilling engineering.
作者
窦蓬
许杰
谢涛
林海
陈毅
Dou Peng;Xu Jie;Xie Tao;Lin Hai;Chen Yi(CNOOC Tianjin Company;State Key Laboratory of Offshore Oil Exploitation)
出处
《石油机械》
北大核心
2018年第11期16-22,共7页
China Petroleum Machinery
基金
国家科技重大专项"渤海油田高效开发示范工程"(2016ZX05058-002)
关键词
稠油热采
热采井
侧钻距离
空隙压力
流-固-热耦合
温度场
数值模拟
heavy oil thermal recovery
thermal recovery well
sidetracking distance
formation pore pressure
flow-solid-thermal coupling
temperature field
numerical simulation
