Design And Development Of Transient Electromagnetic Wellbore Three-Dimensional Imaging Software

With the continuous development of oil and gas well mining and maintenance work,casing damage and deformation problems frequently occur,and the integrity of the wellbore is seriously affected.In order to more intelligently and efficiently verify the true condition of the wellbore and meet the requirements of high-precision and high-efficiency interpretation of casing damage in field logging operations,this article designs a transient electromagnetic wellbore threedimensional imaging software,mainly studying transient electromagnetic wellbore threedimensional imaging detection methods,array logging data error correction methods,and wellbore three-dimensional point cloud conversion methods.Aiming at the transient electromagnetic method wellbore three-dimensional detection system,the wellbore threedimensional imaging software based on MFC is designed and developed.The software integrates three main functional modules of logging data acquisition and storage,data error correction and wellbore three-dimensional imaging,to carry out three-dimensional imaging interpretation of pipe wall and wellbore structure.Firstly,the annular array transient electromagnetic wellbore three-dimensional detection system model is established,and the performance and detection range of the casing damage detection system are analyzed.By analyzing the characteristics and errors of the threedimensional array logging data of the wellbore,combining the corresponding relationship between the sampling time and the inner and outer diameters of the string,a three-dimensional imaging detection method of the wellbore based on the ring array is proposed.On this basis,two error correction methods of fixed segmental mode and adaptive segmental mode are studied.By analyzing the results of the two segmental correction methods,a real-time baseline drift correction algorithm based on adaptive segmental mode is designed,and the accuracy of the algorithm and the stability of the error correction module are verified.In addition,the imaging algorithm of casing wall thickness is designed according to the three-dimensional cylindrical structure of the wellbore,and the conversion method of three-dimensional point cloud of the wellbore is further studied.The imaging of casing wall thickness and inner diameter is realized by combining the three-dimensional point cloud of the wellbore.Finally,a field test is carried out based on the annular array transient electromagnetic wellbore three-dimensional testing system.The wall thickness and inner diameter of the experimental well casing are imprinted by using the three-dimensional wellbore imaging software.Combined with the three-dimensional array logging data,the type of casing damage and the specific orientation can be explained.The experimental results show that the threedimensional wellbore imaging software and three-dimensional three-dimensional imaging algorithm designed in this paper can accurately and efficiently realize casing damage interpretation and obtain three-dimensional wellbore information,providing an important basis for wellbore integrity analysis.