Cased-hole Logging Imaging Technology Research

Cased-hole logging image researching is important explaining foundation of formation information analyzing and casing damage information analyzing.It also has great guiding significance of real-timely monitoring production conditions,searching residual oils,seeing casing damage information,improving the yield of oil and timely adjusting production plans.Because of water-stable oil of mining strategy and the status of most the cased-hole well casing aging,this paper illustrates a cased-hole logging imaging interpretation method which is based on transient electromagnetic logging theory.Moreover,it establishes a theoretical model of transient electromagnetic logging in cased-hole well,analyzes the influence of transient response of each parameter in cased-hole well,carries out a lot of theoretical calculation and simulation,puts forward data preprocessing method,optimizes selection and processing of log raw data,uses methods such as data points selection,data interpolation,data filtering,abnormal separation and depth correction,combines imaging inversion and interpretation theory,develops imaging interpretation software,and constitutes a cased-hole logging imaging explaining system.A large number of simulation,laboratory tests and outdoor oilfield tests were carried out according to strata media identification and casing damage information.Simulation and experimental results show that in this paper cased-hole logging imaging theory,data preprocessing method,image inversion and interpretation theory provide theoretical support for imaging interpretation software and a new interpretation method for cased-hole logging.Compared with the existing cased-hole logging method,one of the advantage of this method is obvious,which is it can realize real-time monitoring of formation resistivity and casing information with broad prospects in the oil industry.