Fractured Reservoir Imbibition Mining Numerical Simulation Study

Naturally fractured reservoirs distribute widely all over the world, which account for tens of billions barrels of oil reserves, are of great economical and strategic potential. In China, fractured reservoirs also possess importance role in oil and gas exploitation and production. With reference to the waterflooding production in naturally fractured reservoirs, water in the fracture system will be imbibed spontaneously into matrix system under the force of capillary pressure, exchanges with oil in the matrix and increases oil recovery rate in the matrix system. Studying fractured reservoir imbibition production mechanisms and analyzing influencing factors of fractured reservoir waterflooding imbibition recovery possess vital roles for bumping up fractured reservoir recovery.This paper took fractured reservoir as researching subject, objected to increasing fractured reservoir recovery, based fractured reservoir geological and exploitation characteristics analysis, aiming at the problems in determining imbibition empirical model parameters by experimental method, presented a new method for determining imbibition empirical model parameter by using least square method linear regression with reservoir producing history data, derived mathematical models for fractured reservoir recovery prediction and time of maximal imbibition rate; Based on fractured reservoir water driving dynamics behavior analysis and imbibition mechanism study, established the fractured reservoir seepage flow mathematical model which fully considered the factor of imbibition, and recasted the program source code. Furthermore, contrastively analyzed fractured reservoir exploitation performances with accounting for imbibition effect and without accounting for imbibition effect.The principal research findings acquired are of following: From reservoir producing history data, adopted least square method linear regression method and determined Babadagli imbibition empirical model parameter; forecasted fractured reservoir production and time of maximal rate of imbibition. Established fractured reservoir waterflooding fluid seepage flow mathematical model, which took imbibition effect into account, solved mathematical model numerically. On the basis of modernization software designing basic idea, adopting modular structure designing , using Visual Basic 6.0 programming languages,...