永川北区深层页岩气强加砂压裂工艺技术研究  

Research on fracturing technology of deep shale gas forced sand in Yongchuan north region

作　　者：刘琦[1] 王峻峰 穆轲帆 邓正仙 LIU Qi;WANG Junfeng;MU Kefan;DENG Zhengxian(Engineering Technology Institute of Southwest Petroleum Branch,Sinopec,Deyang,Sichuan 618000,China;Exploration&Production Research institute,Southwest Oil&Gas Branch Company,Sinopec,Chengdu,Sichuan 610500,China)

机构地区：[1]中石化西南油气分公司石油工程技术研究院,四川德阳618000 [2]中石化西南油气分公司勘探开发研究院,四川成都610500

出　　处：《油气井测试》2025年第1期49-54,共6页Well Testing

基　　金：中石化科技部项目“威荣深层页岩气立体开发优化技术研究”(P22041)。

摘　　要：针对永川北区深层页岩气储层压裂难形成复杂缝网、裂缝导流能力难保持、加砂难度大等问题,采用数值模拟技术对压裂规模开展了优化,引入加砂难度系数分析了主要地质、工程参数对加砂难度的影响,通过支撑剂铺置机理研究分析了影响加砂难度的因素,结合现场应用形成了一套强加砂压裂工艺技术。结果表明,天然裂缝密度和加砂强度为产能主控因素,合理的用液强度为32~36 m^(3)/m,加砂强度为2.8~3 m^(3)/m;孔隙度、含气量、脆性指数是影响加砂难度的正向因素,天然裂缝发育程度和地应力为负向因素,也受到支撑剂粒径、液体黏度和施工排量等因素的影响。经两口水平井成功应用,加砂强度提升至3.2~3.4 m^(3)/m,综合砂比提升至10%,显著提高了改造体积和EUR。为永川北区产能建设提供了支撑,同时为类似深层页岩气的有效开发提供了技术借鉴。In view of the difficulties in forming complex fracture network,maintaining fracture conductivity and sand addition in deep shale gas reservoir in north Yongchuan,numerical simulation technology was used to optimize the fracturing scale,and the influence of major geological and engineering parameters on sand addition difficulty was analyzed by introducing sand addition difficulty coefficient.The factors affecting sand addition difficulty were analyzed by studying the proppant placement mechanism.Combined with field application,a set of forced sand fracturing technology is formed.The results show that the natural fracture density and sand strength are the main controlling factors of productivity.The reasonable liquid strength is 32~36 m^(3)/m,and the sand strength is 2.8~3 m^(3)/m.The difficulty of sand addition is positively correlated with porosity,gas content and brittleness index,negatively correlated with natural frac-ture development and in-situ stress,and also affected by proppant particle size,liquid viscosity and construction displacement.After the successful application of two horizontal wells,the sand filling strength was increased to 3.2~3.4 m^(3)/m,the comprehensive sand ratio was increased to 10%,and the reconstruction volume and EUR were significantly increased.It provides support for the production capacity construction in Yongchuan north region,and provides technical reference for the effective development of similar deep shale gas.

关 键 词：永川北区 深层页岩气 水平井 压裂 加砂强度 加砂难度 支撑剂铺置机理 

分 类 号：TE357[石油与天然气工程—油气田开发工程]