注水开发油藏温度对地应力的影响研究  

Effect of reservoir temperature on in-situ stresses during water injection development

作　　者：孙金[1] 邓金根[1] 蔚宝华[1] 刘凯铭 王厚东[1] 汪伟[1] 鹏程[1] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《中国海上油气》2016年第4期100-106,共7页China Offshore Oil and Gas

基　　金："十二五"国家科技重大专项"复杂结构井优化设计与控制关键技术(编号:2011ZX05009-005)"部分研究成果

摘　　要：长期注水将影响油藏原始温度分布,从而改变原地应力的大小和方向。以渗流力学、多孔介质传质传热学和岩石力学为基础,建立了一维径向油水两相非等温渗流数学模型和温度引起的地应力变化模型,采用有限差分法得到了不同注水时间和地层渗透率下的温度分布规律,进而得到了地应力方向和大小的改变值。研究表明:油藏温度场的分布受传质传热和热传导两种作用的控制;油藏温度的变化将同时改变地应力大小和方向,且不同时间和不同位置处地应力大小和方向的改变值不同,注水温度变化最大的区域地应力变化也最大,原地应力方向的最大偏转值出现在与初始最大水平地应力方位呈45°角的方位处,而当油藏温度均匀降低时地应力方向不发生偏转。本研究对于确定注水油藏现今地应力的大小和方向具有一定的指导意义。The magnitude and orientation of in-situ stresses are affected by change in reservoir temperature after long term water injection. Based on mechanics of fluid flow in porous medium, heat and mass transfer theory and rock mechanics, a one-dimensional radial non-isothermal oil-water phase flow model and a stress change model were established. The temperature field in reservoirs with different permeability values was calculated at different injection time by the finite difference method. And then the change in magnitude and orientation of in-situ stresses were obtained. The results show that the reservoir temperature field is controlled by both heat convection and conduction. The magnitude and orientation of in-situ stresses changes due to change in reservoir temperature, and the amplitude of the change varies with injection time and position. The highest change amplitude of in-situ stresses is in the area where temperature undergoes the greatest change. The greatest change in in-situ stress orientation happens at 45° from the direction of original maximum horizontal in-situ stress

关 键 词：注水 传质传热 非等温渗流 油藏温度 地应力 

分 类 号：TE319[石油与天然气工程—油气田开发工程]