吉木萨尔地区致密油藏水平井优快钻井技术

吉木萨尔地区油层属于低渗、超低渗油气藏,针对该地区油藏的地质特征和钻井特点,在钻井方案中融入"最优化储层改造"思路,优化水平井井眼轨道设计;通过对井震资料、邻井及导眼井的岩性、含油性对比分析,动态跟踪水平段井眼轨迹控制,确保油层钻遇率;优选钻头及辅助提速工具,建立了区块钻头序列和配套提速技术,实现了全井快速钻进;通过测井资料进行水平井井眼稳定性分析,优选钻井液体系和优化钻井液性能,实现了ф152.4 mm小井眼长水平段的安全钻进,最终形成了一套有特色的吉木萨尔凹陷致密油藏的水平井优快钻井技术,为十亿吨级的昌吉油田开发提供了坚实的技术保障。

Optimal and fast drilling technology for horizontal wells to competent oil reservoirs in Jimusar District

The oil layers in Jimusar area are oil/gas reservoir of low and super-low permeability. In view of the geologic features and drilling characteristics of the reservoirs in this area, the concept of optimal reservoir stimulation’ is incorporated in the drilling program to optimize the design of horizontal well trajectory; through comparing and analyzing wellbore seismic data, lithologies and oil possibilities of offset well and pilot hole, and dynamically tracking hole trajectory control in horizontal section, the encountering rate of oil reservoirs is assured; through optimizing the drill bits and auxiliary accelerating tools, and establishing the sequence for this block and the allied accelerating technique, the fast drilling of the whole well is realized; through the analysis of of horizontal hole stability with logging data, and optimization of the drilling fluid system and its properties, the safe drilling of ?152.4 mm long horizontal section is realized. Finally, a set of optimal and fast dilling technology specific for drilling horizontal wells in competent reservoirs in Jimusar Depression is formed, which provides a solid technical guarantee for the development of the 1 billion ton in Changji Oilfield.