Rate Decline of Acid Fracturing Stimulated Well in Bi-Zone Composite Carbonate Gas Reservoirs

This paper develops a model of the multi-wing finite-conductivity fractures considering stress sensitivity for low-permeability bi-zone composite gas reservoirs. A new semi-analytical solution in Laplace domain is presented. The main includes theory source function, integral transformation, perturbation technique, and Stehfest numerical inversion. Wellbore pressure obtained by coupling solutions reservoirs fractures. results showed that derivative curves generated this include bi-linear flow stage. was validated comparing its with Wang’s commercial well-test simulator; excellent agreement. illustrated seepage characteristic acid fracturing stimulated wells during refracturing treatment how they are influenced reservoir hydraulic parameters (asymmetrical factor distribution, etc.). suitable to solve arbitrary-angle fracture helpful understand transient production rate well.