含裂缝正方形反九点井网面积波及效率影响研究  

Study on areal sweep efficiency of square inverted nine-spot well pattern with crack

作　　者：舒杰[1] 唐海[1] 王营营[2] 吕栋梁[1] 王波[2] 杨超 

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]华北油田勘探开发研究院,河北任丘062550 [3]中国石油川庆钻探工程有限公司钻采工程技术研究院,四川成都610500

出　　处：《断块油气田》2014年第3期360-363,共4页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05013-005)

摘　　要：根据低渗透油藏正方形反九点面积注水开发特点,在流管模型和Beckley-Leverett方程的基础上,通过建立考虑启动压力梯度和各向异性的单流管模型,推导出含裂缝的反九点井网的面积波及效率计算公式。反九点井网面积波及效率受裂缝的影响较大,与裂缝夹角越小的计算单元,面积波及效率上升越快,相同时间内面积波及效率越大。由于反九点面积井网中边井大于角井的面积波及效率,所以在实际生产过程中边井和角井应该采取不同的工作制度。利用含裂缝反九点井网面积波及效率计算公式,结合油田实际生产动态数据,可以解决低渗透油田低速非达西渗流的面积波及效率理论计算问题,为油藏开发设计和评价提供理论依据。Aeeording to the charaeteristies of water tlooding development of inverted nine-spn! well pattern in low permeability reservoir, based on the stream tube model and Beekley-Leverett equation and taking the start-up pressure gradient into consideration. this paper derives the theoretical formulas of areal sweep efficiency. The areal sweep efficiency of inverted nine-spot well pattern is greatly influenced by the eraek. The smaller the crack angle is, the faster the cell area of sweep efficiency rises, at the same time, the greater the areal sweep efficiency is. Because the sweep efficiency of edge well is greater than that of corner well, in the actual production, the edge well and corner well should adopt different working system. Using the sweep effieieney calculation fonnula of inverted nine-spot well pattern and combined with the actual oilfieht production performanee data, the sweep efficiency calculation problem of the low-speed non-darey percolation of low permeability oilfield can be solved, which can pr.vide the theoretieal basis for the development and evaluation of low permeability reservoir.

关 键 词：启动压力梯度 裂缝 非达西渗流 正方形反九点井网 面积波及效率 

分 类 号：TE34[石油与天然气工程—油气田开发工程]