The Key Drilling and Completion Technologies and Practice of Long Horizontal Well in Longdong Shale Oil Platform in Ordos Basin
The oil resources in the Chang 7 member of Ordos Basin are rich,mainly distributed in Huachi,Heshui,Jiyuan,Jing'an and other regions.The main structure is located in the eastern part of Tianhuan Depression and the western part of Yishan Slope.The reservoir rock types are mainly lithic feldspar sandstone and feldspar clastic sandstone,which is an important replacement area for the continuous increase of reserves and production in Changqing Oilfield.Different from the marine shale oil in North America,Chang 7 shale oil is a continental lake basin sedimentary system with poor reservoir continuity,strong heterogeneity,and is located in the loess tableland landform with vertical and horizontal gullies.During the development process,it faces many technical challenges such as difficulties in well site construction,high drilling costs,and low cumulative production of single wells.Taking"large well cluster+long horizontal well"as the overall technical idea,technical research on the optimization design of well profile with large offset,strong inhibition of composite salt anti-collapse drilling fluid,and rapid drilling supporting technology of horizontal wells has been carried out.The key ROP optimization tools such as rotary steering system,high-efficiency wear-resistant PDC bit and new hydraulic oscillator are used to further test application,and the drilling and completion technologies of horizontal wells in large well cluster of shale oil is innovatively formed,which effectively solves construction problems during drilling and completion in loess tableland landform and realizes the transformation of shale oil development mode.A new model of scale economy and efficient development is constructed,which provides a solid technical support and guarantee for the rapid and efficient production of shale oil,and provides experience and technical reference for the development of shale oil in other oilfields.
Ordos basinshale oillarge well cluster and long horizontal wellwellbore trajectory
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