A four-parameter calculation method of oil-based mud electric imaging logging based on concave electrode pairs in low-resistivity formation

被引：0

作者：

Gao J. ^{[1
]}

Song Y. ^{[1
]}

Liu Y. ^{[1
]}

Zhu K. ^{[1
]}

Liu X. ^{[1
]}

机构：

[1] School of Electronic Engineering, Xi'an Shiyou University, Xi'an, 710065, Shaanxi

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2020年 / 41卷 / 08期

关键词：

Concave electrode pair; Electric imaging logging; Low-resistivity formation; Mud cake thickness; Oil-based mud;

D O I：

10.7623/syxb202008005

中图分类号：

学科分类号：

摘要：

Oil-based mud (OBM) electric imaging logging is one of the research hotspots in the field of logging. Aiming at the problems of electric imaging logging in the OBM environment, this paper proposes a four-parameter calculation method of OBM electric imaging logging based on concave electrode pairs in low-resistivity formation. The four parameters include formation resistivity, mud cake thickness, OBM resistivity and OBM permittivity. Based on the electrode structure, working principle and the four-parameter calculation method of the concave electrode pairs, this paper analyzes the influencing factors of above four parameters, draws a correction chart for OBM resistivity and OBM relative permittivity, and verifies the accuracy of the calculation method using random data and a layered formation model. The results show that mud cake thickness is a key parameter to calculate the four parameters of OBM electric imaging logging. The calculation steps are as follows: (1) mud cake thickness is first calculated, and then the electrode coefficient and formation resistivity is determined and calculated, respectively; (2) according to the current frequency, formation resistivity, mud cake thickness and other parameters, the numerical calculation results of OBM resistivity and OBM relative permittivity are corrected. Under low-resistivity formation conditions, measurements and calculations based on concave electrode pairs can accurately reflect changes in OBM resistivity, OBM relative permittivity, formation resistivity, and mud cake thickness, providing favorable support for the instrument design and data processing of OBM electric imaging logging. © 2020, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：960 / 968

页数：8

共 22 条

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