An ultra deep water horizontal well for drilling multiple biological reef gas reservoirs was newly deployed in Yuanba block.Faced with difficulties such as slow drilling speed,easy leakage in the Changx-ing Formation,and long drilling cycles,as well as difficulties in controlling the trajectory of the long hori-zontal section of the small wellbore,and difficulty in placing the perforated liner in place,it is difficult to drill in continental Zhenzhuchong and the Xujiahe Formations.By optimizing the design of wellbore struc-ture,selecting directional drilling tools,and optimizing trajectory control methods,researching and selecting drill bits that match the characteristics of the formation and meet the requirements of composite drilling,matching high-performance drilling fluids,and improving the technology of pipe string insertion in ultra deep wells,key technologies for drilling ultra deep and long horizontal sections in Yuanba have been formed,which completed the construction of the first ultra deep horizontal well in Yuanba,with a length of 1 464 meters and a depth of 8 425 meters.The drilling cycle is 237.38 days.Compared with the shortest drilling cycle in Yuanba 102-3 H in the early stage,the well depth increases by 697 meters,the drilling cycle is shortened by 15.87％,and the average mechanical drilling speed is increased by 23.88％.
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