文献类型：期刊文献

中文题名：提高套管井电场数值计算精度的方法研究

英文题名：On Numerical Calculation Precision in Cased Hole Electric Field

作者：李灿苹[1]

机构：[1]广东海洋大学信息学院,广东湛江524088

年份：2010

卷号：34

期号：2

起止页码：135

中文期刊名：测井技术

外文期刊名：Well Logging Technology

收录：CSTPCD、、Scopus、北大核心2008、CSCD_E2011_2012、北大核心、CSCD

基金：国家重点基础研究发展973计划课题(2009CB219505);广东海洋大学人才引进专项基金资助(0812182)

语种：中文

中文关键词：电阻率测井;套管井;电场;数值计算;积分法;留数法;精度

外文关键词：resistivity logging, casing hole, electric field, numerical calculation, integral meth- residue method, precision

中文摘要：准确求取井轴上的电位值对获得地层电阻率非常重要。研究了套管井电阻率测井过程中套管井中电场数值计算的精度和稳定性。介绍了套管井地层电阻率测井原理。给出了计算套管井中井轴上电场电位的2种方法:积分法和留数法。采用积分法计算的电位值在场源距较小时是可取的,但由于被积函数具有振荡性,致使其结果不稳定。采用留数法计算的电位值随着场源距的变大而呈指数规律地迅速减小,很好地反映了电场中的物理规律又提高了电位值的精度。数值计算结果表明,采用留数法的电位值计算结果更稳定,且精度高。

外文摘要：It is important to calculate electric potential value in borehole axis accuratety tor obtaining formation resistivity. With regard to this, the precesion and stability of cased hole electric field numerical computation in the process of cased hole formation resistivity logging data are studied. Introduced is the principle of cased hole formation resistivity logging. Two methods, integration and residue method, for calculating cased hole electric potential value in borehole axis are given. The electric potential value calculated by the integration method is acceptable when the electric field spacing is near. But its results are unstable for the oscillation of the integrated func- tion. The electric potential value calculated by the residue method decreases fast exponentially when the electric field spacing increases. It shows the electric field physical laws and its precision is higher. Numerical calculation results show that the stability and precision of electric potential value computed hy the residue method is higher than that computed by the integration method.