摘要
英买4-2X井为塔里木油田火成岩首口加砂压裂改造井,井斜大,储层埋藏超深(大于5 600 m),属于中孔特低渗储层,具有中孔细喉型结构,高角度天然裂缝发育,加砂压裂施工难度和风险高。结合储层特点,优选低伤害0. 3%瓜胶压裂体系,采用前置酸降破处理,适当提高前置液比例,采用多级支撑剂段塞打磨技术等措施,成功对英买4-2X大斜度井实施了加砂压裂改造。施工挤入地层液体559 m^3,最高排量4. 2 m^3/min,施工压力88～93 MPa (接近管柱安全极限),挤入地层砂量22. 2 m^3。压后气举求产,日产油4. 52 m^3,日产水23. 83 m^3,为低产油水同层。但由于采用常规压裂施工井口和81. 28 mm管柱,施工排量受限,砂堵风险较大,加砂量未达到设计要求。建议该区块后期单井压裂施工设计时考虑采用较大尺寸施工管柱,为压裂施工提供合适的压力空间,提高改造效果。
Well Yingmai 4-2X is the first sand-fracturing well in the igneous rock in Tarim Oilfield with high inclination.The reservoir,with medium porosity and low permeability,is buried deep(>5 600 m)with medium porosity fine throat structure and high-angle natural fracture,making the sand fracturing difficult and risky.Considering the characteristics of the reservoir,the low-damage 0.3%guar fracturing system is selected.The lead acid is treated with gel breaking capacity reduction.The proportion of the lead fluid is appropriately increased.The multistage proppant slug grinding technology is adopted.The sand fracturing has been successfully done in Well Yingmai 4-2X with stimulation liquid of 559 m^3 and sand of 22.2 m^3 under the highest displacement of 4.2 m^3/min and the pumping pressure of 88~93 MPa(close to the safety limit of the fracturing string).Gas lift production after the fracturing showed a daily oil production of 4.52 m^3 and the daily water production of 23.83 m^3,indicating a low-yield oil and water production layer.However,due to the use of conventional fracturing wellhead and 81.28 mm pipe string,the limited pumping displacement results in large sand blocking risk,and consequently the sand amount does not meet the design requirements.It is suggested that the single-well fracturing design in the later stage of the block development should consider the use of larger-size pipe string to provide suitable pressure limit for fracturing operation and improve the stimulation effect.
作者
刘辉
杨向同
袁学芳
刘举
任登峰
任慧宁
LIU Hui;YANG Xiangtong;YUAN Xuefang;LIU Ju;REN Dengfeng;REN Huining(Oil and Gas Engineering Research Institute,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)
出处
《油气井测试》
2018年第6期46-50,共5页
Well Testing
基金
国家重大科技专项"超深超高压高温气井优快建井与采气技术"(2016ZX05051-003)
关键词
超深火成岩
特低渗储层
加砂压裂
压裂管柱
施工排量
施工曲线
压后评估
ultra-deep igneous rock
ultra-low permeability reservoir
sand fracturing
fracturing string
pumping displacement
pressure curve
post-fracturing evaluation
