北京11选5走势图带连线:
[1]沈建國,譚剛,朱留方,等.瞬變電磁過套管電阻率測井響應模擬及分析[J].測井技術,2019,43(02):111-117.[doi:10.16489/j.issn.1004-1338.2019.02.001]
 SHEN Jianguo,TAN Gang,ZHU Liufang,et al.Simulation and Analysis of Transient Electromagnetic Resistivity Logging Through Casing[J].WELL LOGGING TECHNOLOGY,2019,43(02):111-117.[doi:10.16489/j.issn.1004-1338.2019.02.001]
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瞬變電磁過套管電阻率測井響應模擬及分析()
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《測井技術》[ISSN:1004-1338/CN:61-1223/TE]

卷:
第43卷
期數:
2019年02期
頁碼:
111-117
欄目:
方法研究
出版日期:
2019-06-20

文章信息/Info

Title:
Simulation and Analysis of Transient Electromagnetic Resistivity Logging Through Casing
文章編號:
1004-1338(2019)02-0111-07
作者:
沈建國1 譚剛1 朱留方2 臧德福2 張付明2 黃玉科2
(1.天津大學微電子學院, 天津 300072; 2.中石化勝利石油工程有限公司測井公司, 山東 東營 257096)
Author(s):
SHEN Jianguo1 TAN Gang1 ZHU Liufang2 ZANG Defu2 ZHANG Fuming2 HUANG Yuke2
(1. School of Microelectronics, Tianjin University, Tianjin 300072, China; 2. Logging Company, Shengli Petroleum Engineering CO. LTD., SINOPEC, Dongying, Shandong 257096, China)
關鍵詞:
過套管電阻率測井 地層電阻率 測井曲線 傳導電流 幾何因子 瞬態波形 瞬變電磁測井
Keywords:
resistivity logging through casing formation resistivity conductive current log curve geometric factor transient waveform transient electromagnetic logging
分類號:
P631.84
DOI:
10.16489/j.issn.1004-1338.2019.02.001
文獻標志碼:
A
摘要:
瞬變電磁過套管電阻率測井采用線圈電流的導通和關斷方式進行大功率激發,測量 套管井內不同源距的瞬態響應波形。現場測井得的瞬態波形有2個響應:一個是脈沖,位于 激發時刻; 一個是單峰波形——上升沿變化快、下降沿變化慢、位于激發時刻之后。用實 軸積分法模擬套管井的瞬變電磁響應,得到的2個響應與所測量的波形特征一致,它們分別 對應于位移電流(電磁波)和傳導電流(電磁感應)的響應。傳導電流密度與地層電導率成正 比,過套管電阻率測井主要利用第2個瞬態響應獲得地層的電導率。由于瞬變激發的連續譜 以低頻為主,測井波形中直接耦合的無用信號幅度很大。用同一源距不同深度測量的波形 相減可以去掉響應中的無用信號(直接耦合響應和井內液體、套管、水泥環的二次場響 應),得到2個深度點所測量地層的二次場差,該二次場差與所測量的不同區域地層電導率成 正比,從二次場差波形中任取一點的幅度均可得到1條曲線,對其反褶積并刻度可以得到地 層電導率隨深度的變化曲線,加上初值便得到地層的電導率,實現過套管地層電阻率的連續 測量。
Abstract:
In the process of cased-hole TEM logging, transient electromagnetic wave(TEM)is excited by turning on/off transmitter current, and the responses from different points are recorded. The TEM responses obtained by field logging has two response peaks, one is a pulse located at the exciting time, and the other is a single peak appearing after the exciting time, which changes rapidly along the rising edge and slowly along the descending edge. In this study, a real axis integral method was used to simulate the TEM responses in a cased-hole. The stimulated results are consistent with measured waveforms. The two response peaks correspond to displacement current (electromagnetic wave)and conduction current(electromagnetic induction). Because conductive current density is directly proportional to formation conductivity, the formation conductivity outside the casing is obtained by the second response peak. However, the amplitude of the useless signal directly coupled in TEM logging response is very large because the transient continuous spectra are of low frequency. To remove the useless signals(i.e., directly coupled signals and secondary field responses of fluid, casing and cement sheath in a well), the waveform measured at one depth is subtracted by that measured at another depth from the same source, to obtain the difference of secondary field responses at two depths. The difference is proportional to the conductivity of the detected interval. Then, a curve can be obtained from the amplitude of any point in the waveform of the second field difference. After deconvoluting and calibrating the curve, the conductivity curve of formation varying with depth can be obtained. Finally, by adding the known initial value, the formation conductivity can be obtained, and the continuous measurement of formation resistivity through casing can be realized.

參考文獻/References:

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備注/Memo

備注/Memo:
(修改回稿日期: 2019-01-10 本文編輯 余迎)基金項目: “十三五”國家重點研發計劃(2016YFC0802000)資助第一作者: 沈建國,男,1963年生,博士,教授,從事超聲和瞬變電磁測量原理與技術、套管井瞬變電磁方法理論和應用、套管井剩余油探測和井間分布監測等應用研究。E-mail:[email protected]
更新日期/Last Update: 2019-06-20