Maliuchang Construct Modern Well Test Analysis Of The Theoretical Model And Its Application

Well testing is widely used in oil/gas field exploration and exploitation both in home and abroad, and it has become an important means in reservoir recognition and evaluation, production performance monitoring and completion efficiency assessment. Well testing is an imperative work in scientifically exploiting oil and gas field. Well testing data is a necessary, which must be available in oil and gas field evaluating, establishing and adjusting development program.The development and application of well testing is depend on whether the current well testing theory can resolve the problems in the process of production or can achievement meet the field manager and decision maker's demand. Presently, there is a discrepancy existing in internal well testing area, and that is a plenty of new theories can't transform into new technologies, which are badly needed in field or can't offer the service for field.Most of the oil/gas fields have to face such problems as multiphase flow, heterogeneous reservoir, non-Darcy flow, complex boundary. The current software library applied in well testing analysis is classic well testing explanation model, but the conflict between explanation model and practical condition makes this software library can't meet the need of field well testing explanation. Considering this problem, it is necessary to improve the traditional explanation model, establish the theoretical model which is really needed, more close to practical gas reservoir and more suitable for the application of gas reservoir in order to serve for production.In this article, we choose Jialing River formation's gas reservoir in Ma liuchang structure in the south of Sichuan area, which is a representative gas reservoir in Sichuan basin. We use modern well testing method to research the new method, which contains the following procedures: to establish physical modernâ†' to establish mathematic modelâ†' Laplace transformâ†' Stehfest numerical inversionâ†' to obtain dimensionless pressure and pressure derivative versus to dimensionless time type curve, and to analyze the influence of parameters to the bottom-hole pressure in gas reservoirs, and the main achievements are as follow:We have established the well testing explanation mathematic model in dual porosity gas reservoir, which considers the wellbore storage, skin effect and pseudosteady crossflow, obtained the type curves of pressure behavior and analyzed all kinds of factors which influence the well bottom pressure behavior.We have established the well testing explanation mathematic model in dual permeability gas reservoir, which considers wellbore storage, crossflow between two formations and different skins, obtained the type curves of pressure behavior and analyzed the influence of dual permeability parameter on well bottom pressure behavior.