Diagnosis Of Fracture Length In Hydraulic Fracturing Based On Low Frequency Electromagnetic Induction Method

In dense(low permeability)formations,hydraulic fracturing is a common technique to improve oil and gas recovery by generating one or more artificial fractures in wells.Generally speaking,it is necessary to evaluate the main geometric attributes of an artificial fracture,including its shape,length,thickness and main direction of diffusion,so as to formulate a more favorable plan for oilfield development.In this paper,a fracture is modeled as a thin disk perpendicular to the well,filled with sand or other conductive proppants.The influence of low frequency electromagnetic induction method on the fracture length of hydraulic fracturing is studied.The sensitivity of operating frequency,distance between transmitter and receiver,proppant conductivity(resistivity)and other factors to diagnose different length of hydraulic cracks are simulated and analyzed by low frequency electromagnetic induction measurement method combined with HP finite element method.The numerical results show that with the decrease of operating frequency,the distance between transmitter and receiver increases,the conductivity of proppant increases,and the sensitivity of low frequency electromagnetic induction method to crack length increases.