水平井两种复杂井周状态下声波测井响应的模拟分析

Simulation analysis of acoustic log under two complex circumferential borehole conditions in horizontal well

利用三维应力-速度有限差分数值模拟方法,在水平井段存在套管偏心和岩屑床条件下,正演模拟了井中声场分布,针对CBL-VDL测井给出了两种源距(3ft和5ft)的接收波形及不同时刻的声场快照。通过对计算结果的分析,了解了上述复杂井周环境对测井响应的影响,为水平井固井质量评价测井资料的解释分析提供了依据。

By using three-dimensional stresses versus velocity difference numerical simulation analysis, under the conditions of existing casing eccentricity and cuttings beds, an acoustic field distribution in the borehole is forward modeled, and some snapshots of the received waveforms in two spaces 3ft&5ft and the acoustic field in different time are given for CBL-VDL log. By analyzing the results, the effects of the circumferential borehole conditions on the logging response can be known, thus can provide a basis for the interpretation and analysis of the cementing quality evaluation logging data.