Research On Location Method Of Underground Electromagnetic Positioning

In the past century,energy sources such as oil and natural gas have become increasingly indispensable.At the same time,accidents such as blowouts caused by drilling have also occurred from time to time.How to control accident wells in a timely and effective manner has become a serious problem that we cannot avoid.Relief well is the most effective mean to deal with accidents such as blowouts and well overflows.Accurate measurement of the direction and distance between the relief well and the accident well is the most important part of the relief well technology.In this paper,the following researches and work are mainly focused on the detection of the orientation and distance of relief well and accident well.The main research includes:Firstly,this paper studies the theory of two types of relief well technologies and analyzes the propagation law of alternating current in the stratum and the wells of relief wells and relief wells and accident wells after the injection well current is injected into the stratum.The principle of distance and direction inversion;then analyzes the time-domain response analysis of the receiving coil after the square-wave excitation of the transmitting coil in the relief well transient electromagnetic detection method(TEM)and the principle of direction and distance inversion of the two wells.Then,using the finite element simulation software modeling and simulation of the current injection method to analyze the electrode layout,excitation amplitude,probe position,the impact of the relief well inclination and other factors on the performance of the relief wells,while verifying the three-electrode focusing scheme detection performance which has been improved to a certain extent,and the laws of orientation and distance inversion of relief wells and accident wells have been obtained.In addition,the response law of the transient electromagnetic receiving coil,and the influence of factors such as the off-time of the excitation current and the number of turns of the receiving coil on the detection performance are analyzed,which provides guidance for the design of the detection system.Finally,the advantages and disadvantages of the two relief wells detection methods are analyzed separately.Based on the advantages of the relief wells injection current method and the transient electromagnetic method,the advantages and disadvantages of the relief wells are improved,and a relief well joint detection scheme based on different distances and different schemes is proposed.And analyzed its advantages and disadvantages to prepare for follow-up experiments and engineering applications.