分支水平井技术在伊拉克HFY油田的应用

通过对伊拉克HFY油田Mishrif储层特点及钻采工程的研究,确定了采用分支井双分支裸眼悬空侧钻并裸眼下筛管的钻完井方式;通过对分支连接井段的井壁稳定、主、分支井眼轨道及施工进行优化设计及作业,形成了HFY油田分支井裸眼悬空侧钻关键技术,降低了主、分支井眼钻井的难度与风险,成功完成4口分支水平井的钻井。第1口分支井生产测试获得了日产原油1 638 m3,与单支水平井初产相比增长了2倍。分支水平井在HFY油田的应用表明,根据油田条件确定合适的分支井钻完井方式是油田优化钻井、优化开发方式、提高综合开发效益的重要途径,Mishrif储层分支井钻井的成功为中东地区大型碳酸盐储层分支井钻井积累了经验,也为油田低成本开发开拓了思路。

Application of branch horizontal well technology in HFY Oilfield of Iraq

Through research into the characteristics of Mishrif Reservoir in Iraqi HFY Oilfield and the drilling and production engineering, we determined that the wells be drilled and completed by suspended sidetracking in openhole in dual branch wells and by running screen tubes in openhole; by stabilizing the sidewall of the branch connecting hole sections and optimizing the design and drilling of the main hole and branch hole trajectories, we have developed the key technology for suspended sidetracking of branch openhole in HFY Oilfield, reduced the difficulty and risk in the drilling of the main wellbore and branches, and have succeeded in drilling of four branch horizontal wells. Oil production test in the first branch well flowed at a rate of 1 638 m3 of oil per day, two times up compared with the initial production of single horizontal well. The application of branch horizontal wells in HFY Oilfield shows that the proper drilling and completing manner for branch wells determined in line with oilfield conditions is a critical approach to optimizing well drilling and development of the oilfield and improving the overall development benefits. The success in the drilling of branch wells to Mishrif Reservoir provides experiences for the drilling of branch wells into large carbonate reservoirs in the Middle East areas and has expanded ways for low cost development of the oilfields.