摘要
由于金属套管对电磁场有屏蔽作用,且接收到的信号是金属套管和地层耦合后的总信号,使得井间电磁测井在信号的发射和接收方面遇到了很大的困难。为了提高套管接收的信号质量,利用comsol软件研究了发射电流、频率、地层电导率、井间距离对接收信号的影响规律。对2根4m长的套管进行模拟仿真,仿真结果表明:接收套管接收到的信号随着给发射套管施加电流的频率的增大而减小,随着套管间距离增大而减小,随着地层电导率的增加而减小,随着发射电流的增大而单调递增。
Because a metal casing has shielding effect on electromagnetic field and the signals it receives are a sum of signals which are coupled between the metal casing and formation, cross-hole electromagnetic logging has great difficulty in transmitting and receiving signals. In order to improve signal reception, a study was made on the effects of such factors as emission current, frequency, formation conductivity, and the distance between wells on signal reception by using Comsol software. Two 4-meter-long casings were simulated and the simulation results show that the signals the signal-receiving casing receives decrease with the increase of the frequency of the current applied to the signal-transmitting casing, the increase of the distance between casings, and the increase of formation conductivity, but increase monotonically with the increase of signal-transmitting current.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期17-22,共6页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(41174160)
国家科技重大专项基金资助项目(2011ZX0502601)
关键词
套管
井间
电磁测井
电势值
仿真
casing
cross-hole
electromagnetic logging
maximum potential value
simulation
