基于声波变密度测井信息识别水平井压裂裂缝的方法

发布时间：2018-05-05 16:37

本文选题：水平井 + 压裂　；参考：《石油钻探技术》2017年05期

【摘要】：针对水平井压裂裂缝难以识别的问题,研究了基于声波变密度测井(VDL)信息的水平井压裂裂缝识别方法。首先进行水平井压裂裂缝的VDL模拟试验,研究压裂裂缝的VDL响应特征,然后用实际井压裂前后的VDL资料进行压裂井段识别与效果评价。研究表明:当第一、二界面胶结良好时,非裂缝段套管波的波幅很小、地层波的波幅较大,VDL图中地层波相线粗而明显;随着裂缝段接收与发射探头间裂缝数量增多,套管波的波幅增大、地层波的波幅减小,VDL图中地层波呈灰白色而模糊不清、弯曲率大、成"人"字形,其地层纵波时差增大、能量降低。模拟试验和现场应用均验证了利用VDL识别水平井横向压裂裂缝的可行性,可见VDL信息可为水平井压裂裂缝检测与压裂效果评价提供依据。
[Abstract]:In order to solve the problem that fracture is difficult to identify in horizontal wells, a fracture recognition method based on acoustic variable density logging (VDL) information is studied in this paper. First, the VDL simulation test of fractured fractures in horizontal wells was carried out to study the VDL response characteristics of fracturing fractures, and then the recognition and effect evaluation of fracturing wells were carried out with VDL data before and after fracturing. The results show that when the first and second interfaces are cemented well, the amplitude of the casing wave in the non-fractured section is very small and the wave amplitude of the formation wave is larger than that in the VDL diagram, and the number of fractures between the two probes increases with the increase of the fracture segment. The wave amplitude of casing wave increases, the wave amplitude of formation wave decreases. The formation wave in the VDL map is gray white and fuzzy, and its bending rate is large. The formation wave has the shape of "human", and its P-wave time difference increases and its energy decreases. The feasibility of using VDL to identify horizontal fracturing fractures in horizontal wells is verified by simulation test and field application. It can be seen that VDL information can provide basis for fracture detection and fracturing effect evaluation in horizontal wells.
【作者单位】：油气藏地质及开发工程国家重点实验室(西南石油大学);中国石油集团测井有限公司长庆事业部;
【基金】：国家重点基础研究发展计划(“973”计划)项目子课题“页岩气水平井井眼轨迹优化设计与地质导向理论研究”(编号:2013CB228003)资助
【分类号】：TE357.1

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