一种探测金属套管外地层电阻率的井中时域脉冲电磁法制造技术

本发明专利技术公开了一种探测金属套管外地层电阻率的井中时域脉冲电磁法，步骤为：1)井下构建大功率脉冲发射源；接收记录系统记录磁场垂直分量Bz产生的感应电动势ε随时间变化的数据；对发射波形和接收信号同时进行记录；2)进行多次发射-接收，将信号叠加，提高信噪比；3)按套管参数和记录的发射源电流波形计算套管响应，获得套管外地层相对感生电动势Δεf；4)对相对感生电动势值进行校正；5)进行一维反演，将随时间变化的观测信号转换成井周地层电阻率的径向变化信息；6)由反演电阻率值获得井段套管外地层电阻率纵向与径向分布的二维图像；7)按完井时的测量资料和解释结果，由套管外储层电阻率的分布可确定储层中剩余油的分布状况。

A time domain pulse electromagnetic method for detecting resistivity of metal casing

The invention discloses a time domain detecting metal outside the casing layer resistivity of wells pulse electromagnetic method, which comprises the following steps: 1) the construction of high power pulse source; receiving record system produced by Bz vertical magnetic induction electromotive force e the data over time; the transmitted waveform and the received signal at the same time records; 2) multiple transmitting and receiving, signal adding, improving the signal-to-noise ratio; 3) according to the source current waveform and record the casing parameter calculation of casing response obtained outside the casing layer relative electromotive force of delta epsilon f; 4) the relative induced electromotive force values were corrected; 5) of 1-D inversion observation signal will change over time into radial change information around well formation resistivity; 6) by inversion of resistivity values obtained outside the casing wells layer resistivity vertical and radial distribution of the two-dimensional image; 7) to completion The distribution of the remaining oil in the reservoir can be determined by the distribution of the resistivity of the reservoir outside the casing.

【技术实现步骤摘要】

【技术保护点】
１．一种探测金属套管外地层电阻率的井中时域脉冲电磁法，其特征在于：具体操作步骤为：１）在含有金属套管的目标井段中，给井下装置大功率脉冲发射源的发射线圈通以脉冲电流，产生瞬时大功率的脉冲磁场激发；井下装置的接收记录系统在距发射源一定距离处用接收线圈记录磁场垂直分量Ｂｚ产生的感应电动势ε随时间变化的数据；对发射波形和接收信号同时进行全时段数字记录；２）在同一深度点进行多次发射一接收，将多次接收信号叠加，提高信噪比；３）根据已知的套管参数和记录的发射源电流波形计算相应的套管响应，获得套管外地层的相对感生电动势Δεｆ：（ｍａｔｈ）??（ｍｒｏｗ）?（ｍｉ）＆Ｄｅｌｔａ；（／ｍｉ）?（ｍｓｕｂ）?（ｍｉ...

【技术特征摘要】

【专利技术属性】
技术研发人员：胡文宝，严良俊，王军民，徐振平，罗明璋，苏朱刘，唐新功，刘迪仁，陈清礼，谢兴兵，向葵，毛玉蓉，
申请(专利权)人：长江大学，
类型：发明
国别省市：42