丛式水平井井组压裂工艺技术研究及试验

Study and Test of Horizontal Well Cluster Fracturing Technology

何青 李国锋 陈作 李月丽 刘世华

He Qing Li Guofeng Chen Zuo Li Yueli Liu Shihua

中国石化华北分公司, 河南郑州 450006; 中国石化石油工程技术研究院, 北京 100101

Sinopec Huabei Company, Zhengzhou, Henan, 450006, China; Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China

为提高致密砂岩气藏的开发效益，基于储层工程地质特征、单井测录井、随钻伽马等资料，采用三维两相模型气藏数值模拟和全三维网络模型裂缝数值模拟相结合的方法，优化了丛式水平井井组的裂缝整体布局、裂缝参数和施工参数。盒1层、山1层和太2层的参数优化结果为：裂缝采用等间距交错布局，缝间距150 m，裂缝数量7~9条，裂缝半长150~200 m，裂缝导流能力30 D·cm；施工排量4.0~5.0 m3/min，前置液体积分数35%~40%，平均砂比21%~25%，单段加砂量35~45 m3。DP43H和 DPT-27 丛式水平井井组压裂后无阻流量分别达到77.6×104和73.2×104 m3/d，平均单井无阻流量分别为12.9×104和18.3×104 m3/d，比同层位邻井分别提高1.5和2.2倍，压裂施工时间比单井累计施工时间分别缩短11和17 d。研究结果表明，丛式水平井井组压裂技术是致密砂岩气藏提高单井产量、缩短施工周期、降低施工成本的有效手段。

In order to improve the development benefit of tight sandstone gas reservoir,based on the engineering geological characteristics of reservoirs,single well logging data,and measurement of gamma while drilling,the overall fracture pattern,fracture parameters and treatment parameters of horizontal well cluster were optimized by combining the numerical simulations of three-dimensional two-phase reservoir model and full three-dimensional network model.As a result,He 1,Shan 1 and Tai 2 formations were optimized to a crossing fracture pattern with equal spacing(150 m),containing 7-9 fractures with half length of 150-200 m and conductivity of 30 D·cm,and other parameters including 4.0-5.0 m3/min displacement,35%-40% prepad,21%-25% average proppant concentration and 35-45 m3 sand content in single segment.Field application showed that,after fracturing,two horizontal well clusters(i.e.DP43H six-well cluster and DPT-27 four-well cluster)achieved open-flow capacity of 77.6×104 and 73.2×104 m3/d respectively,with single well open-flow capacity of 12.9×104 and 18.3×104 m3/d,which were 1.5 times and 2.2 times of that offset wells in the same formation.Moreover,the fracturing time of the two well was 11 d and 17 d less than the accumulative time of wells.It is therefore concluded that the horizontal well cluster fracturing technology is an effective solution to improve the single well production,shorten the treatment period,and reduce the cost of fracturing.

国家科技重大专项“大型油气田和煤层气开发”专题“大牛地致密低渗气田特殊结构井钻完井及改造技术”（编号：2011ZX05045）和中国石油化工股份有限公司科技攻关项目“致密砂岩丛式水平井分段压裂优化设计研究”（编号：P13001）部分研究内容。

https://doi.org/10.3969/j.issn.1001-0890.2014.04.015