致密油藏水平井同井缝间驱替补能实施方案研究及现场应用——以槐树庄油区L井为例  

Implementation scheme research and field application of interstage displacement and energy substitution in horizontal wells of tight oil reservoirs:A case study of Well L in Huaishuzhuang area

作　　者：安继刚[1] 王建国 王鹏[1] 刘鹏虎[1] 左斌 周凯 杨风芝 AN Jigang;WANG Jianguo;WANG Peng;LIU Penghu;ZUO Bin;ZHOU Kai;YANG Fengzhi(Fuxian Oil Factory,Yanchang Oilfield Co.,Ltd.,Yan’an,Shaanxi 727500,China;Karamay FOR-ENERGY Petroleum Technology Co.,Ltd.,Karamay,Xinjiang834099,China;School of Earth Science and Resources,Chang’an University,Xi’an,Shaanxi 710054,China)

机构地区：[1]延长油田股份有限公司富县采油厂,陕西延安727500 [2]克拉玛依国勘石油技术有限公司,新疆克拉玛依834099 [3]长安大学地球科学与资源学院,陕西西安710054

出　　处：《中国海上油气》2024年第5期110-119,共10页China Offshore Oil and Gas

基　　金：延长油田股份有限公司科研项目“水平井开发配套工艺技术研究与试验(编号:yscy2020xjs-c-03)”部分研究成果。

摘　　要：针对槐树庄油区致密油藏存在的天然能量严重不足、地饱压差小、注水难、裂缝水窜等问题,提出在压裂后的水平井上实施同井缝间驱替补能技术。利用井组实际油藏参数和压裂参数,建立复杂裂缝网络模型并完成历史拟合,在符合地质实际的模型上对水平井同井缝间驱替补能技术的注采方式和注采参数进行优化,并对技术适应性进行评价。结果表明:同井同步注采且裂缝间隔驱替(奇注偶采、偶注奇采)的方式更易发挥缝间驱替作用;该技术在致密低能量储层,水平井水平段平行于最大渗透率方向,裂缝间距为100 m时适用效果最好。在槐树庄油区L井,通过下入磁定位封隔器实现注采缝之间的有效分隔,通过环空注水+油管采油的方式实现了同井缝间驱替补能技术的现场实施。与衰竭开发相比,实施8个月后平均日产液、平均日产油、地层压力等均有大幅提升。水平井同井注采补能技术实现了一井两用,降本增效,可大规模应用于低能致密油藏的开发。In response to the issues of severe natural energy deficiency,small difference between saturation pressure and formation pressure,difficult water injection,and water channeling in fractures in the tight oil reservoirs in the Huaishuzhuang area,the interstage displacement and energy substitution technology was implemented in horizontal wells after fracturing.By utilizing the actual reservoir and fracturing parameters of the well group,a complex fracture network model was established,and history matching was completed.On a geologically realistic model,the injection and production modes and parameters of the interstage displacement and energy substitution technology for horizontal wells were optimized,and the adaptability of the technology was evaluated.The results show that the method of simultaneous injection and production in the same well using alternate fracture displacement(injection at odds and production at evens or injection at evens and production at odds)is more likely to exert the effect of interstage displacement.This technology is most effective when applied to low-energy tight oil reservoirs,where the horizontal section of the horizontal well is parallel to the direction of maximum permeability,and the fracture spacing is 100 meters.In Well L in the Huaishuzhuang area,the interstage displacement and energy substitution technology is implemented on site by using a magnetic positioning packer to effectively separate the injection and production fractures,combined with the method of injection in annular+production in tubing.Compared with depletion development,the formation pressure and average daily rates of liquid and oil have all been greatly improved after eight months of technology implementation.The interstage displacement and energy substitution technology for horizontal wells achieves dual use of one well,reduces costs,and increases efficiency,and it can be widely applied to the development of low-energy tight oil reservoirs.

关 键 词：水平井 致密油藏 压裂 缝间驱油 数值模拟 

分 类 号：TE349[石油与天然气工程—油气田开发工程]