基于COMSOL软件的随钻双感应测井仪器半空间响应研究
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摘要
探讨了随钻双感应测井仪器槽开口方向、仪器高度以及地层电导率的变化对半空间响应的影响规律,从而为确定随钻双感应测井仪器线圈系误差提供相关依据。首先简化随钻双感应测井仪器半空间响应模型装置,使用COMSOL软件建立水平响应模型,并开展了网格剖分和模型验证工作,对最终的响应特性进行深入分析。研究表明:在仪器槽开口方向不同的前提下,地层电导率增加,半空间响应呈现出非线性增加的趋势;仪器槽开口方向不同,对半空间响应的影响也较大(其中,开口向下时影响最大,开口向上时影响最小);当仪器高度达到0.4m时,半空间响应达到最大,且峰值所在位置不会随地层电导率的变动而变动。
In order to investigate the influential regularity of the change of slot opening direction,instrument height and electrical conductivity on the half-space response of dual-induction logging while drilling,the basis for determining the coil error of dual-induction logging while drilling is provided,the half-space response of rod-dual-induction logging tools is studied in depth.First of all,the semispace response model of logging-while-drilling dual-induction logging instrument is simplified.COMSOL software is used to establish the horizontal response model,and the meshing and model verification are carried out.The final response characteristics are analyzed in depth.The results show that under the premise of different slot opening directions,the conductivity increases in formation and the half-space response shows a nonlinear increase trend.For different slot opening directions of logging tool,there is a geater influence on the half-space response.Among them,when the slot is down faced,the impact is the maximum,when the slot is up faced,the impact is the minimum,the instrument reaches the height of 0.4 m,the half-space response reaches the maximum,and the location of the peak is not changed with the conductivity of formation.
In order to investigate the influential regularity of the change of slot opening direction,instrument height and electrical conductivity on the half-space response of dual-induction logging while drilling,the basis for determining the coil error of dual-induction logging while drilling is provided,the half-space response of rod-dual-induction logging tools is studied in depth.First of all,the semispace response model of logging-while-drilling dual-induction logging instrument is simplified.COMSOL software is used to establish the horizontal response model,and the meshing and model verification are carried out.The final response characteristics are analyzed in depth.The results show that under the premise of different slot opening directions,the conductivity increases in formation and the half-space response shows a nonlinear increase trend.For different slot opening directions of logging tool,there is a geater influence on the half-space response.Among them,when the slot is down faced,the impact is the maximum,when the slot is up faced,the impact is the minimum,the instrument reaches the height of 0.4 m,the half-space response reaches the maximum,and the location of the peak is not changed with the conductivity of formation.
引文
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[3]刘福平,王安玲,杨长春.环形槽孔钻铤随钻感应测井场分布的解析解[J].中国科学(E辑:技术科学),2009,39(2):376～384.
[4]魏宝君,王莎莎,欧永峰.用并矢Green函数的矢量本征函数展开式模拟随钻感应测井仪器的响应[J].地球物理学报,2011,54(5):1391～1401.
[5]张甜甜.随钻感应测井响应数值计算研究[J].测井技术,2013,37(3):239～243.
[6]许巍,柯式镇,李安宗,等.随钻双感应测井仪三维响应模拟及理论刻度[J].应用地球物理,2014,11(1):31～40.
[7]许巍,柯式镇,姜明,等.随钻双感应测井仪器刻度响应研究[J].中国石油大学学报(自然科学版),2014,38(6):61～66.
[8]张家田,崔新,许凯.基于套管设计的过套管测井系统井下仪器研究[J].现代电子技术,2016,39(7):127～129.
[9]朱庚雪,刘得军,张颖颖,等.基于hp-FEM 的随钻电磁波测井仪器响应正演分析[J].石油钻探技术,2015,43(2):63～70.
[10]黄颖,陈文燕,刘冬冬.石油测井仪器电流检测系统的研究[J].科学技术与工程,2017,17(11):222～227.
[11]王珺,陈鹏,骆庆锋,等.随钻方位伽马测井仪器设计及试验[J].地球物理学进展,2016,31(1):476～481.
[12]叶雨.随钻双感应测井响应特性研究[D].西安:西安石油大学,2015.
[13]刘丹,潘保芝,陈刚,等.水平井感应测井响应影响因素数值模拟分析[J].地球物理学进展,2015,30(4):1750～1754.
[14]王甜甜.多分量感应测井响应特性及解释方法研究[D].青岛:中国石油大学(华东),2009.
[15]汪建勋.层状非均质各向异性地层中多分量感应测井数值模拟与响应特征[J].测井技术,2013,37(4):374～379.
[16]张烨,汪宏年,陶宏根,等.基于耦合标势与矢势的有限体积法模拟非均匀各向异性地层中多分量感应测井三维响应[J].地球物理学报,2012,55(6):2141～2152.