多场耦合作用对水力裂缝形态的影响  

INFLUENCES OF MULTI-FIELD COUPLING ACTION ON THE HYDRAULIC FRACTURE MORPHOLOGY

作　　者：胡永全[1] 王强[1] 史向阳[2] 侯庆香 张倩 赵金洲[1] HU Yongquan;WANG Qiang;SHI Xiangyang;HOU Qingxiang;ZHANG Qian;ZHAO Jinzhou(State Key Laboratory of Oil-Gas Reservoir Geology ＆ Exploitation, Southwest Petroleum University, Chengdu 610500, China;The First Oil Production Plant of PetroChina North China Oil Field Branch, Renqiu 062552, China;No. 3 Oil Production Plant of Qinghai Oilfield, Haixi 816400, China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油天然气股份有限公司华北油田分公司第一采油厂,河北任丘062552 [3]青海油田采油三厂,青海海西816400

出　　处：《大庆石油地质与开发》2018年第3期82-89,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目"基于多尺度页岩复杂流动行为的动态评价模型研究"(51404204);中国石油化工股份有限公司科研项目"裂缝动态扩展影响因素研究"(31400026-16-ZC0607-0013)

摘　　要：为深入研究水力裂缝几何形态变化,基于热流固耦合基本理论,将压裂过程中物性参数视为应力、应变、孔隙压力、温度的函数,采用位移不连续法、有限差分、迭代等计算方法,分析热流、流固、热流固、非热流固耦合条件等因素对裂缝形态的影响。结果表明:压裂过程中耦合作用对储层温度场影响较小,对井底附近裂缝内流体温度影响较大;考虑耦合效应与不考虑耦合效应条件下,裂缝形态有较大差异,流固、热流固耦合作用使裂缝长度、缝内流体压力、缝宽相对减小,而热流耦合作用则相反;相对非热流固耦合条件,流固耦合影响最为突出,热流耦合影响相对较小,热流固耦合作用下裂缝形态与现场测试数据最为匹配。In order to further study the changes of the geometrical shape of the hydraulic fracture,on the basis of the basic theory of thermo-hydro-mechanical coupling,the physical parameters in the fracturing process regard as the functions of the stress,strain,pore pressure and temperature. With the help of the calculating methods of DDM（ displacement discontinuity method）,finite difference and iterative calculating method,the influences of four coupling conditions of the thermo-hydro（ TH）,hydro-mechanical（ HM）,thermo-hydro-mechanical（ THM） and nonthermo-hydro-mechanical（ NTHM） on the crack morphology were analyzed. The achievements show that the coupling actions has little effects on the reservoir temperature,while they possess great influences on the fluid temperature in the fracture near the well bottom; the fracture morphology presents rather obvious differences when taking the coupling effects into account or not,the HM and THM coupling effects can relatively decrease the fracture length,fluid pressure within the fracture and the crack width,while the TH coupling effect manifests an oppositeaction; Corresponding to the NTHM coupling condition,The influence of HM coupling is the most prominent,the effect of TM coupling is relatively small,under the interaction of THM coupling,the shapes of the crack match best with the field tested data.

关 键 词：水力压裂 裂缝形态 热流固耦合 流固耦合 有限差分 

分 类 号：TE357[石油与天然气工程—油气田开发工程]