低渗透油田小型分层压裂工艺实践

Technological practice of small-scale layered fracturing

孙鲜伟 乔翠敏 翟广红 马翠岩 王威 刘金仓 张风慧

SUN Xianwei QIAO Cuimin ZHAI Guanghong MA Cuiyan WANG Wei LIU Jincang ZHANG Fenghui

大港油田公司，天津300280 华北油田公司，河北任丘062552

Dagang Oilfield Company, Tianjin 300280, China Huabei Oilfield Company,Renqiu 062552,China

针对低渗透—特低渗透储层含油井段长，单井产量低，储层水敏性强的情况，通过采用分层段小规模多轮次水力压裂技术，对大港西斜坡油田进行整体增产改造。在室内岩心评价的基础上，采用了Viking-C改性胍胶压裂液体系及与地层相适应的Carbo-Lite中强度、低密度压裂砂，并合理设计压裂规模和裂缝参数，68.2%的施工采用了套管压裂注入方式，进行低排量、高砂比压裂施工，有效提高了单井产量，改善了低效油田的开发局面。

As a low and extra-low permeability oilfield, Xixiepo Oilfield features in large non-producing and difficult-to-recover reserves, long oil-bearing intervals, low single-well production, and high water sensitivity. Small-scale layered multi-cycle hydraulic fracturing techniques are employed to increase the production of the oilfield. On the basis of lab core evaluation, the Viking-C modified guar gel fracturing fluid system and the mid-strength low-density Carbo-Lite fracturing sand appropriate to the formation are utilized. The fracturing scale and fracture parameters are rationally designed. The casing fracturing injection mode is used in 68.2% fracturing operation which features in low discharge capacity and high sand concentration. Single-well production is effectively increased, as well as the development of low-efficiency oilfields. 