Research On The Method Of Relative Attitude Recognition In Near Distance Of Relief Well By TEM

In the large-scale oil and gas well production process,once a blowout accident occurs in an oil and gas well,its impact is difficult to estimate,and relief wells are an important means of controlling blowout accidents.Based on the detection technology of relief wells by transient electromagnetic method,the thesis focuses on the issues of near-field relative attitude recognition method of transient electromagnetic relief wells,symmetric coil array signal processing,and the design of rescue well detection system.This paper first introduces the basic principle of the transient electromagnetic relief well detection method.For the relief well detection model,the response signal of the electromagnetic probe to the accident well is analyzed,and the formula of the relative distance between the relief well and the accident well and the electromagnetic probe response induced electromotive force is derived In addition,the simulation software was used to analyze the factors affecting the detection performance of the relief well,and a method to optimize the system parameters and improve the detection accuracy was proposed.On this basis,the near-relative relative attitude recognition method of relief wells was studied,an array relief well detection model was established,the signal processing method of the array coil response to the secondary field of the accident well was analyzed,and the array signal weighting method was used to improve the system signal-to-noise ratio.Based on the array signal processing of the variable electromagnetic detection system,a Radon transform method for judging the relative attitude of relief wells is proposed.Combining the symmetry characteristics of the transient electromagnetic response downhole,the relative attitude of the casing and relief well of a section of accident wells within the measured range Make judgments.On this basis,an array downhole detection system is designed according to the response characteristics of various signals downhole,and the circuit parameters are debugged and optimized to improve the detection performance of the system.Finally,in view of the problem of near-field accurate detection methods of rescue wells,a large number of indoor and outdoor experiments and field experiments were carried out.The test results show that this paper proposes a near-well relative attitude recognition method for rescue wells,which can effectively improve the accuracy of rescue wells’ close-range detection and improve the performance of rescue well detection system.