川东北元坝区块裂缝对渗流场的影响分析  

Analysis of the Effect of Fractures on Seepage Field in Yuanba Block in the Northeastern Sichuan Province

作　　者：魏臣兴 练章华[2] 郭衍茹 丁士东[3] 赵旭[3] 

机构地区：[1]中国石油渤海钻探工程技术研究院,天津300475 [2]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500 [3]中国石油化工股份有限公司石油工程技术研究院,北京100003

出　　处：《长江大学学报（自科版）（中旬）》2015年第7期51-54,5,共4页Journal of Yangtze University(Nature Science Edition)

基　　金：国家科技重大专项(2011ZX05005-006-008HZ)

摘　　要：针对元坝地区含裂缝储层,在充分考虑含裂缝储层裂缝孔隙度、渗透率以及真实天然气物性的基础上,分别建立含45°倾斜裂缝、水平裂缝和垂直裂缝有限元模型,利用Comsol Multiphysics软件对含裂缝储层模型渗流场进行计算,得到含裂缝储层中近井壁的渗流场分布规律。从中进一步研究不同裂缝对基岩渗流速度的影响程度。研究得出:含裂缝储层渗流场中,在裂缝穿过的地层中,等压面上的压力弱有变化,表现为光滑等压面有折断趋势,相同的压力在裂缝更靠近井底。裂缝对基岩内渗流场分布影响并不大,但裂缝内的渗流速度相对于基岩内渗流速度有数量级上的变化,会显著的增加单井产量。因此在低渗地层尽量利用贯穿裂缝或人工造缝提高地层导流能力。For reservoirs with fractures in Yuanba Area,based on the full consideration of fracture porosity and permeability and gas property,finite element models considering 45°inclined fracture,horizontal and vertical fractures were established respectively,Comsol Multiphysics software was applied to calculate seepage field of reservoirs with fracture,the rules of near borehole seepage field distribution in the reservoirs were obtained.The influence fractures to rock seepage velocity were further researched.The results show that in seepage filed of fractured reservoirs as the fracture goes through the formation,the weak pressure changes on the isobaric surface,it has a tendency of breaking on the isobaric surface and the same pressure appears in fracture and closer to bottom hole.The fractures have less effect on distribution of seepage field in the bedrock,but the seepage velocity in the fracture relative to seepage flow velocity in the bedrock has the change of orders in magnitude and it would significantly increase the single well production.A penetration fractures or artificial fractures should be used as many as possible to increase flow conductivity in low permeability formations.

关 键 词：元坝 裂缝 有限元 渗流场 

分 类 号：TE312[石油与天然气工程—油气田开发工程]