水力喷射体积压裂裂缝间距优化方法研究  

Research on optimization method of fracture spacing in hydraulic jet volume fracturing

作　　者：陈立强 张启龙 吴洪波 李华朋 王赞 李佳旭 CHEN Liqiang;ZHANG Qilong;WU Hongbo;LI Huapeng;WANG Zan;LI Jiaxu(CNOOC Energy Technology Drilling&Production Company,Tianjin 300459,China;CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海油能源发展股份有限公司工程技术分公司,天津300459 [2]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《石油化工应用》2022年第1期31-36,共6页Petrochemical Industry Application

基　　金：中海石油(中国)有限公司科技项目“渤海在生产油气田增产稳产钻完井技术研究”资助,项目编号:YXKY-2019-TJ-04。

摘　　要：低渗储层在渤海油田占比较大,水力喷射压裂技术集水力射孔、分段隔离、喷射压裂于一体,受到海上压裂的青睐。为提高分段压裂储层改造体积,提高油气层采收率,本文基于二维裂缝诱导应力场模型建立了三维裂缝诱导应力场模型,从裂缝周围应力场的角度提出了裂缝间距优化方法。以渤海油田A井为例,由于受第一条裂缝产生的诱导应力场的影响,在距离第一条裂缝中心35 m以内的范围内,最大水平主应力方向较原始地应力发生反转,在距离第一条裂缝中心35~167 m的范围内,最大水平主应力方向较原始地应力发生转向。以最大水平主应力反转线35 m作为布置分段压裂间距的依据,既能保证裂缝间距较小,形成体积裂缝,又能使裂缝正常扩展,形成有效裂缝。本文模型对合理优化裂缝间距提供了一定的指导意义。Low-permeability reservoirs account for a large proportion in Bohai oilfield.Hydraulic jet fracturing technology integrates hydraulic perforating,segmental isolation and jet fracturing,and is favored by offshore fracturing.In order to improve the volume of segmented fracturing reservoir and improve the recovery of oil and gas reservoirs,a three-dimensional fracture induced stress field model is established based on the two-dimensional fracture induced stress field model,and the crack spacing optimization method is proposed from the perspective of the stress field around the crack.Taking the A well of Bohai oilfield as an example,due to the induced stress field generated by the first crack,the maximum horizontal principal stress direction is reversed from the original ground stress within the range of 35 m from the center of the first crack.In the range of 35~167 m of the first crack center,the maximum horizontal principal stress direction turns away from the original ground stress.Taking the maximum horizontal principal stress reversal line 35 m as the basis for arranging the segmental fracturing spacing,it can ensure that the crack spacing is small,the volume crack is formed,and the crack can be expanded normally to form an effective crack.This model provides a certain guiding significance for rational optimization of crack spacing.

关 键 词：渤海油田 低渗储层 水力喷射压裂 诱导应力场 裂缝间距 

分 类 号：TE357.13[石油与天然气工程—油气田开发工程]