一种均质油藏热流耦合半解析温度试井模型  

A semi-analytical temperature well test model coupled with heat and flow for homogeneous oil reservoirs

作　　者：吴明录[1] 孙伟 王倩 赵增平[2,3] 栗鹏光 路敬涵 黎娇 WU Minglu;SUN Wei;WANG Qian;ZHAO Zengping;LI Pengguang;LU Jinghan;LI Jiao(School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;China United Coalbed Methane Corporation Ltd, Beijing 100095, China;PetroChina Coalbed Methane Company Ltd, Beijing, 100028)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中联煤层气国家工程研究中心有限责任公司,北京100095 [3]中石油煤层气有限责任公司,北京100028

出　　处：《大庆石油地质与开发》2021年第3期58-65,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“中低煤阶煤、薄煤层群煤层气高效压裂和裂缝监测、评估技术研究”(2016ZX05042G003);国家油气重大示范工程“缝洞型油藏超深小井眼侧钻及靶向酸压技术研究与配套”(34400007-ZC0609-0001)。

摘　　要：考虑地层中渗流场和温度场的综合影响,建立了均质油藏热流耦合的温度试井解释模型,并研究了模型的半解析求解方法,即将均质无限大、定压、封闭外边界油藏的压力解析解代入温度场,再采用数值方法求解温度场,得到测试井的不稳定温度变化。研究了产量、岩石参数、流体参数、综合导热系数和热储系数等对温度曲线的影响规律,不同的参数对温度试井曲线的不同阶段产生各不相同的影响。结果表明:油井以定产量生产时,随着流体的压力(压能)降低,内能增加,储层岩石和流体的温度升高;产量越大,单位时间内采出的热流量越大,中期段温度变化速度越慢,温度和温度导数曲线越低;地层岩石密度和比热容越大,温度和温度导数曲线在早、中期之间的过渡段越低;流体密度和比热容越大,整个温度试井曲线越高;综合导热系数越大,温度试井曲线中期段出现的时间越早,整体高度也越低;热储系数主要影响温度试井曲线的早期阶段,其值越大,早期阶段持续时间越长。应用该方法对温度资料进行试井解释,可得到储层的综合导热系数、饱和度等参数,对地热井、油气井的温度动态预测、产能及储量评价等具有重要意义。In this paper,a heat-flow coupled temperature well test interpretation model was established for homogeneous oil reservoirs by considering the comprehensive influence of seepage field and temperature field in the formation.The semi-analytical solution method of the model was also studied,i.e.,substituting pressure analytical solutions of infinite homogeneous reservoirs with constant pressure and closed outer boundary into the temperature field,which was then solved by the numerical method to obtain the change of transient temperature of the test well.The affecting laws of the production,rock and liquid parameters,comprehensive heat conductivity and thermal-storage coefficients on the temperature curve were studied,and different parameters have various effects on the temperature well test curves at diverse stages.The results show that when the oil wells are producing at a constant rate,with the decrease of the pressure(pressure energy)of the fluid,the internal energy of fluid increases,which leads to the increase of the temperature of both the rock and liquid.The larger the production is,the greater the heat flow produced per unit time will be;the slower the temperature change at the medium stage,the lower the temperature and its derivative curves;the higher the rock density and specific heat capacity,the lower the temperature and its derivative curves at the early-middle transition stage;the greater the fluid density and specific heat capacity,the higher the whole temperature well test curve;the higher the comprehensive heat conductivity coefficient is,the earlier the intermediate section of the temperature test curve occurs,and the lower the overall height is.The thermal storage coefficient mainly affects the early stage of the temperature well test curve for the larger the value is,the longer the duration of the early stage will be.With the help of the method,the well test interpretation was engaged for the temperature data,and then the comprehensive heat conductivity coefficient,saturation and other parameters

关 键 词：温度 压力 试井 比热容 导热系数 

分 类 号：TE353[石油与天然气工程—油气田开发工程]