EILOG补偿声波测井仪应用中异常情况探讨

THE ABNORMAL CIRCUMSTANCES IN APPLICATION OF EILOG COMPENSATED SONIC LOGGING TOOL

传统的单发单收声系或单发双收受井径变化影响较大,而后期开发的双发双收声系则对井眼补偿作用较好。EILOG补偿声波测井仪采用双发双收原理,可有效消除井眼变化的影响,在恶劣井眼条件下采地层声波速度资料。由于此仪器在国内应用广泛,所以对它在测井中异常情况的有效认识及有力排除对今后EILOG补偿声波测井仪在国内的正常使用有重要意义。本文从地区区域地质情况,井中情况,仪器自身情况出发,讨论的异常点主要有3点：1.裂缝发育的地层引起周波跳跃;2.声波在进入已经用水泥固结的表层套管时有时会卡不住首波;3.仪器的技术缺陷导致声波窜波.

The traditional single-income single sound system or single dual-caliper change greater acceptance,and the late development of the twin double-shut system is better on the compensation of borehole.The EILOG(Express Image Logging ) compensation acousitc logging instrument uses the twin engine double to receive the principle,but eliminates the bore hole change effectively the influence,picks the bedding wave velocity material under the bad bore hole condition.Because this tool is widespread in the domestic application,therefore unusual circumstance's effective understanding and the powerful elimination will have the important meaning to it in the oil well logging to the next EILOG compensation acousitc logging instrument in the domestic normal use.This article from the area regional geology situation,in the well the situation,instrument own situation embarks,discussion's unusual spot mainly has 3 points:1.the crack growth's bedding causes the cycle skip;2.the sound wave when enters already the durable cement solidifying surface casing sometimes will not be able to bite the head wave;3.instrument's technical flaw causes the sound wave to flee the wave.