超低渗透油藏分段多簇压裂水平井渗流特征研究  

Flow regimes of segmented multi-cluster fractured horizontal well in ultra-low permeability reservoir

作　　者：王欢[1] 廖新维[1] 赵晓亮[1] 李小锋[2] 王明[3] 宋金鑫 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国石油长庆油田分公司苏里格气田研究中心,陕西西安710018 [3]中国石油长庆油田分公司第三采油厂,宁夏银川750001 [4]西部钻探吐哈录井工程公司,新疆鄯善838202

出　　处：《陕西科技大学学报（自然科学版）》2014年第2期93-96,共4页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(U1262101);科技部国家科技重大专项项目(2011ZX05009)

摘　　要：基于鄂尔多斯盆地长8超低渗透油藏地质与流体特征,应用数值模拟方法和等效网格加密技术建立了分段多簇压裂水平井单井数值模拟模型.利用数值试井的手段,研究了分段多簇压裂水平井的渗流规律及影响因素.结果表明:分段多簇压裂水平井渗流主要分为6个阶段,且表现出双重介质的特性;井筒储集系数的大小决定着垂直径向流是否出现,驼峰峰值随表皮系数的增大而增大;主裂缝导流能力主要对前期和中期渗流阶段影响较大,裂缝半长对无因次压力和压力导数的影响较小;改造区渗透率对无因次压力和压力导数曲线位置及形状产生较大影响;应力敏感的存在会使无因次压力和压力导数曲线上移,但各个渗流阶段不会发生明显的变化.Based on the geological and fluid proprieties of Chang-8 ultra-low permeability res-ervoir ,a single well numerical simulation model of segmented multi-cluster fractured hori-zontal is built by using the method of numerical simulation and the technology of equivalent local grid refinement （EQ-LGR） .Application of the model ,flow regimes and its affecting factors of segmented multi-cluster fractured horizontal well are studied by using numerical well test .The result shows that the segmented multi-cluster fractured horizontal well has six flow stages and show s the characteristic of double media .Whether the vertical radial flow ap-pears depends on the size of the wellbore storage coefficient .Hump peak increases with the increase of skin factor .Flow conductivity of main fractures mainly affects the early and mid-dle flow stages .Fracture half-length is less effect on the dimensionless pressure and pressure derivative .Permeability of simulated zone has great influence on the locations and shapes of dimensionless pressure and pressure derivative curve .The existence of stress sensitive can make the dimensionless pressure and pressure derivative curve upward ,but each stage hasn′t obviously changed .

关 键 词：超低渗透油藏 水平井 分段多簇压裂 数值试井 渗流规律 

分 类 号：TE348[石油与天然气工程—油气田开发工程]