疏松砂岩油藏脱砂压裂产能流固耦合模拟  

FLUID-SOLID COUPLING SIMULAITON OF PRODUCTIVITY BY SCREEN OUT FRACTURING IN UNCONSOLIDATED SANDSTONE RESERVOIR

作　　者：曲连忠[1,2] 赵益忠[3] 程远方[1] 沈海超[1] 

机构地区：[1]中国石油大学石油工程学院,山东东营257061 [2]胜利油田孤岛采油厂,山东东营257231 [3]胜利油田采油工艺研究院,山东东营257000

出　　处：《大庆石油地质与开发》2009年第6期187-191,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：基金项目：国家高技术研究发展计划“863”项目（2007AA062208）资助.

摘　　要：基于广义达西定律，建立了渗透率各向异性疏松砂岩油藏脱砂压裂人工裂缝—油藏系统流固耦合模型，模拟分析了降压生产流固耦合作用对储层应力应变特征、储层孔渗特性变化及储层压后生产动态的影响。研究表明：在流固耦合作用影响下，近井眼及人工裂缝周边储层有效应力显著增大，随着距井眼及人工裂缝距离的增加，储层有效应力及其梯度急剧减小；开井生产初期，储层有效应力场变化显著，随生产时间的增加，储层有效应力场逐渐趋于稳定，仅随空间位置而变化；近人工裂缝壁面处储层弹性模量显著增加，在一定程度上降低了储层应变，增强了储层抵抗外载变形的能力；流固耦合作用会导致储层孔渗参数显著降低，使得脱砂压裂井产量明显低于常规渗流模型计算结果。Abstract： Fluid-solid coupling model of artificial fracture-reservoir system in permeability anisotropy unconsolidat- ed sandstone reservoir by screen out fracturing is established based on generalized Darey＇ s law. Influence of fluid- solid coupling effect of production on reservoir stress-strain characteristics, reservoir porosity and permeability prop- erty and production performance followed by fracturing are simulated and analyzed. The study shows that reservoir effective stress dramatically increases near wellbore and around artificial fracture, and while reservoir effective stress and its gradient dramatically declines as distance increasing to wellbore and artificial fracture. Reservoir stress field changes obviously at the beginning of well production, and as time goes on, reservoir it tends gradually to be sta- ble, only changing with spatial location. Reservoir elastic modulus near artificial fracture wall surface increases dramatically, formation. leading to el. decreasing reservoir strain to some degree and improving the capacity of reservoir resisting external de- Fluid-solid coupling effect may cause obviously declining reservoir porosity and permeability parameter, screen out fracturing wells production lower than calculation results of conventional infiltrating fluid model.

关 键 词：疏松砂岩 脱砂压裂 产能 流固耦合 模拟 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]