Response Simulation And Application Of Array Induction Logging

The modern exploration of oil and gas fields has been developing in the direction of refinement and accuracy,and the requirements for logging tools have been further improved.Array induction logging tools have the characteristics of high resolution and deep detection,and can solve complex intrusion profiles and other problems.Therefore,array induction logging has been widely used and has achieved good geological application effects.Based on the Finite Element Method,this paper conducts basic research on the response of the array induction logging instrument under different formation conditions,and uses the simulation results to solve the actual logging problem.Firstly,this paper investigated the development process of array induction logging tools and learnd the advantages and disadvantages of array induction logging and the existing problems.Investigated the application and development of numerical simulation method in electrical logging.Using the basic theory of electromagnetic field and the Finite Element Method to establishe the mathematics and geometric model of array induction logging.The model is simplified according to different influencing factors,and the homogenous stratum is simulated to verify the accuracy of the method.Secondly,for the borehole influencing factors that are likely to cause abnormal response of the array induction logging we made the forward calculation which is performed on the basis of the finite element numerical simulation method.The calculation results show that the wellbore radius can affect the logging response of the subarray 1 to the subarray 4,and the apparent resistivity increased by the mud resistivity increases.When the resistivity of the mud is greater than 50?·m,the change of the mud resistivity is not affected.Resistance,well-hole effects in the wellbore environment can easily be mistaken for the presence of thin layers in log interpretation.Further more,the visual resistance curves were simulated for the two-and three-step stratum conditions.The short array is sensitive to the resistivity change of the target layer and can determine the interface of the formation more accurately.The long array is sensitive to the variation of the thickness of the target layer.Mud invasion has a greater influence on the short array,and it has less effect on the long array.Finally,the paper simulated the simulations of array-induced logging responses in G1 infilled wells in heavy oil thermal recovery areas.The effect of temperature on formation resistivity was finally determined,and parameters such as formation thickness and formation resistivity were accurately determined.The validity of the Finite Element Method in array induction well logging simulation were verificated.