镇泾地区断缝体储层选择性固井关键技术

Key technologies for selective cementing of fault-fractured reservoirs in Zhenjing area

鄂尔多斯盆地镇泾地区断缝体储层断层和裂缝发育,固井极易漏失,井漏致使地层漏封,影响油气井开发寿命,漏失的水泥浆污染储层堵塞油气流动通道,不利于油气资源的经济效益开发。通过优化入井管串结构,优选管外封隔器、分级箍和水泥承留器等固井用关键工具,完善安全下套管技术,配套开发了微膨胀弹性水泥浆和高效驱油前置液体系,形成了满足镇泾地区断缝体储层的选择性固井关键工艺技术,可以实现井眼环空的选择性封固,确保储层的有效分隔,满足断缝体储层后期分层分段储改的技术需求。经过3井次现场应用试验,效果良好。

Due to the development of faults and fractures in the fault-fractured reservoirs in the Zhenjing area of Ordos Basin,it is easy to leakage in cementing,which leads to formation leakage sealing and affects the development life of oil and gas wells.The leaking cement slurry pollute the reservoirs and block the oil and gas flow channel,which is not conducive to the economic development of oil and gas resources.By optimizing the structure of pipe string,selecting key tools for cementing such as tubing packers,grading hoops,and cement holders,perfecting safe casing-lowering technology,and developing micro-expansion elastic cement slurry and high-efficiency oil displacement pre-fluid system,a key technology for selective cementing of fault-fractured reservoirs in Zhenjing area has been formed,which can realize the selective sealing of the annulus of borehole to ensure the effective separation of reservoirs and meet the technical requirements of stratified and segmented reservoir reform in the late stage of fractured reservoir.After 3 wells field application test,the effect is good.