摘要
近年来川南页岩气开采规模不断扩大,取得了一定成绩的同时钻井施工过程中也遇到了较多井下复杂情况及储层污染的问题。如何优化还处于勘探阶段,过高的钻井液密度体系是当前急需解决的问题。针对钻井液密度体系设计问题,提出基于阵列声波的岩石力学评价结果来表征页岩储层的三压力剖面。在区域测压资料基础上,制作了区域垂深-孔隙压力图版约束伊顿模型,以提高三压力模型的精度。利用该结果设计了11口水平井钻井液密度安全窗口,给出了钻井液密度窗口的优选依据。钻井液密度优化对实现页岩气高效安全开发具有重要意义。
With the extensive growth of shale gas development in the south of Sichuan Province,downhole problems and reservoir damage are becoming more and more frequent.Optimization of the density of the drilling fluids,which is too high for reservoir protection,is a problem that needs to be urgently resolved presently.To have the mud density better suitable for shale gas drilling,a rock mechanical evaluation result based on array sound wave is selected to characterize the three-pressure profile of shale reservoirs.Using regional pressure measurement data,a vertical depth-pore pressure plate constraint Eaton model was developed to improve the precision of the three-pressure model.Safe drilling windows for 11 horizontal wells have been designed using this model,and the bases for selecting the safe drilling window were presented.Optimization of drilling fluid density is of great importance to the safe and efficient development of shale gas.
作者
白国斌
BAI Guobin(Geology Research Institute of Great Wall Drilling Company,Panjin,Liaoning 124010)
出处
《钻井液与完井液》
CAS
北大核心
2020年第2期196-201,共6页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”(2017ZX05035)。
