地质工程一体化关键技术在克拉苏构造带高效开发中的应用实践

Application practice of key technologies of geology-engineering integration in effi cient development in Kelasu structural belt

塔里木盆地库车坳陷克拉苏构造带,储层埋藏深度大,地质条件复杂,导致钻完井工程中面临着相关井控安全、建井时效、工程质量、单井提产等方面的巨大挑战,针对这些制约勘探开发进程的关键技术难题,建立了一套以地质力学为桥梁的地质工程一体化技术流程,形成了井位优选、井轨迹优化、钻前地层压力预测、钻井井壁稳定性预测、完井提产优化和开发中出砂出水预测方法。将地质研究、工程设计和现场实施组织纳入一体化协作体系,解决工程难题,实现克拉苏构造带"三提"——提速、提质、提产,开发井钻井成功率100%,单井钻井复杂平均减少40%,井控安全得到有力保障,改造后单井平均无阻流量由原来的68×10~4m^3/d提高到279×10~4m^3/d。顺利实现了克拉苏东部150×10~8m^3/a天然气建产,助力克拉苏西部万亿立方米大气藏的发现,为超深层复杂油气藏高效开发积累了可借鉴的技术和经验。

In the Kelasu structural belt of the Kuqa Depression,Tarim Basin,the burial depth of reservoir is deep and the geological conditions are complex,which leads to great challenges in drilling and completion operations,such as well control safety,well construction time effi ciency,engineering quality,single well production increase and so on.In view of these key technical issues which restrict the exploration and development process,a set of technical process of geology-engineering integration with geomechanics as a bridge has been established,forming a series of methods such as well location selection,well trajectory optimization,pre-drilling formation pressure prediction,borehole stability prediction,completion and stimulation optimization,and sand and water producing prediction during production.The geological research,engineering design and on-site operation are organized and integrated into the collaborative system to solve engineering issues and achieve“3 improvements”in the Kelasu structural belt:improvements of drilling speed,quality and production.The drilling success rate of development well is 100%,the complex drilling issue of single well is reduced by 40%on average,and well control safety is effectively guaranteed.After stimulation,the average open gas fl ow of single well increased from 68×104m3/d to 279×104m3/d.The gas productivity of 150×108m3/a in the eastern Kelasu area has been successfully established,which contributes to the large discovery of trillion square meters of gas reservoirs in the western Kelasu area,and accumulates technologies and experiences for effi cient development of ultra-deep complex reservoirs.