灰色关联度分析法优选水平井压裂参数  

Optimization of Fracturing Parameters for Horizontal Wells in Block a of Aonan Oilfield

作　　者：周志军[1,2] 唐佳琦 黄咏梅[3] 范云鹏 郝玉 ZHOU Zhi-jun;TANG Jia-qi;HUANG Yong-mei;FAN Yun-peng;HAO Yu(School of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;Key Laboratory of Enhanced Oil Recovery of Ministry of Education,Northeast Petroleum University,Daqing 163318,China;The Library of Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆163318 [3]东北石油大学图书馆,黑龙江大庆163318

出　　处：《数学的实践与认识》2021年第20期65-72,共8页Mathematics in Practice and Theory

基　　金：国家科技重大专项“低物性段改造酸化压裂技术研究”(2016ZX05012-002-006)。

摘　　要：敖南油田A区块经过多年的直井-水平井联合布井注水开发,由于区块内渗流特征复杂,井网对于剩余油控制不住,开发效果逐渐变差,井间动用程度逐渐降低.为了改善开发效果,提高原油采收率,对A区块内新加密的水平井进行压裂参数,通过三维地质建模和数值模拟研究的方法,研究裂缝间隔、裂缝缝半长以及裂缝导流能力等参数对累计产油量的影响,通过灰色关联度分析方法研究各个参数的影响权重,优选出最佳的压裂参数组合.研究发现当裂缝参数为:裂缝间隔40m,裂缝缝半长120m,裂缝导流能力为40μm2/cm时,压裂增产效果最好;各参数影响权重顺序为:裂缝间隔> 裂缝缝半长> 裂缝导流能力.采用优选的参数进行开发指标预测,模拟预测十年,综合含水率降低了 7.89%,采出程度提高了 6.11%,较大幅度提高了目标区块的采收率,对现场水平井压裂施工具有理论指导意义.After many years of water injection development with vertical horizontal wells in block a of Aonan oilfield,due to the complex percolation characteristics in the block,the well pattern can not control the remaining oil,the development effect gradually becomes poor,and the inter well production degree gradually decreases.In order to improve the development effect and improve the oil recovery rate,the fracturing parameters and non-uniform fracture arrangement scheme are optimized for the newly infilled horizontal wells in block a.the influence of fracture interval,fracture half length and fracture conductivity on the cumulative oil production is studied by the method of 3D geological modeling and numerical simulation.Each parameter is studied by the method of grey correlation analysis The best combination of fracturing parameters is selected.It is found that when the fracture parameters are:fracture interval of 30m,fracture half length of 120m,fracture conductivity of 40/μm^(2)/cm,the fracturing stimulation effect is the best;the order of influence weight of each parameter is:fracture interval>fracture half length>fracture conductivity;in the arrangement of fracture nonuniformity,select part to avoid shooting,that is,when fracture can avoid high water cut area,the fracturing stimulation effect is better.Using the optimized parameters to predict the development indexes,the comprehensive water cut has been reduced by 7.89%and the recovery degree has been increased by 6.11%in ten years of simulation prediction,which greatly improves the recovery of the target block,and has theoretical guiding significance for the field horizontal well fracturing construction.

关 键 词：敖南油田 压裂参数优选 数值模拟 灰色关联度分析 采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]