裂缝对致密储层渗流能力影响实验研究  

Experiment Research on the Effect of Fracture on the Seepage Capacity of Tight Reservoir

作　　者：吕金龙[1,2] 卢祥国 王威[1,2] 谢坤[1,2] 胡勇[3] Lyu Jinlong;Lu Xiangguo;Wang Wei;Xie Kun;Hu Yong(Northeast Petroleum University, Daqing, Heilongjiang 163318, China;MOE Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China)

机构地区：[1]东北石油大学,黑龙江大庆163318 [2]提高油气采收率教育部重点实验室,黑龙江大庆163318 [3]中国石油勘探开发研究院,北京100083

出　　处：《特种油气藏》2019年第2期141-146,共6页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金面上项目"抗盐型聚合物油藏适应性及其改进方法基础研究"(51574086);"十三五"国家科技重大专项"渤海双高油田多级窜逸堵调驱一体化技术研究及示范"(2016ZX05058-003-010)

摘　　要：针对低渗透气藏开发技术需求,以气藏工程为理论指导,采用物理模拟技术,结合致密气藏地质特征和裂缝分布特点,开展了裂缝对储层渗流能力改善作用机理及其影响因素研究。结果表明:裂缝-孔隙双重介质岩心渗透率理论值高于实测值,原因在于实际裂缝壁面粗糙增加了气体流动阻力,导致实测渗透率值较小;裂缝全贯穿时,裂缝宽度和数量对岩心渗透率影响较大,裂缝未贯穿时,裂缝贯穿程度和分布位置对岩心渗透率影响较小;裂缝分布位置对岩心产气能力影响较小;裂缝-孔隙双重介质岩心渗透率受基质渗透率影响程度较大,随裂缝宽度、贯穿程度和数量增加,岩心产气能力增大;在其他条件相同情况下,裂缝距离底水越远,岩心受水侵影响程度越小,产气量越大,产气时间越长。研究认为,裂缝能改善储层渗流能力,量化评价裂缝对储层渗流能力影响有利于提高气藏开发效果。In order to meet the technical requirements of low-permeability gas reservoir development, based on the theoretical guidance of gas reservoir engineering, physical simulation was used to study the action mechanism of fracture on reservoir seepage capacity and its influencing factors by combining with tight gas reservoir geology and fracture distribution pattern. Result indicates that the theoretical permeability of fracture-pore dual-medium core sample is higher than the measured permeability. The actual fracture wall roughness increases the gas flow resistance, which results in a relatively smaller measure permeability value. The core permeability with complete fracture penetration is greatly dependent on the fracture width and quantity. The core permeability with incomplete penetration is rarely dependent on the fracture penetration level and distribution. The gas production capacity of core sample is rarely influenced by the fracture distribution. The permeability of fracture-core dual-medium core sample is significantly affected by its matrix permeability. The gas production capacity of core increases with the increase of fracture width, penetration level and quantity. The gas production rate and time increase while the water intrusion level decreases with the increase of the distance between fracture and bottom-aquifer. Research suggests that fracture can improve reservoir seepage capacity and quantitative evaluation of fracture effect is favorable to enhance gas reservoir development performance.

关 键 词：致密气藏 裂缝岩心 渗透率 产气能力 影响因素 物理模拟 机理分析 

分 类 号：TE311[石油与天然气工程—油气田开发工程]