Deformation Fluid-structure Interaction Of A Condensate System In Equilibrium Theory And Applied Research In Media

Condensate gas reservoir is a special resource with high economic value, which has double characteristic, the trait of both oil reservoir and gas reservoir. The phase behavior of condensate reservoir affects greatly on gas and oil percolation, and ultimate recovery of condensate oil and natural gas.Nowadays, the hypotheses of phase behavior test and mathematical model of condensate gas reservoir are as follows; do not consider the influence of interfacial phenomena factors, such as adsorption and interfacial tension etc; little consider adsorption, interfacial tension and capillary condensation of condensate oil and gas system under deformable medium condition. In fact, these hypotheses omit factual oil and gas dynamic in formation. In order to describe the influence of pore medium transmutation in reservoir and interfacial phenomena on development dynamic of condensate gas reservoir, the influences of interfacial phenomena factors, such as surface adsorption, capillary condensation and interfacial tension, on phase behavior change qf oil and gas system are considered and the influence of rock deformation on formation fluid is also considered.Based on rock mechanics theory, oil and gas phase behavior equilibrium theory and formation damage experiments, different influence factors of condensate gas phase change, such as surface adsorption, capillary condensation and interfacial tension, are researched, formation physic parameters are analyzed sensitively, the rules of permeability and porosity change with effective stress are found. Found on phase equilibrium theory, dew point model considering adsorption and capillary condensation is established; then dew point model considering adsorption, capillary condensation and rock deformation is further established; and then phase equilibrium model considering reservoir hydrocarbon volume change and the formation of capillary stress is establish; afterward one example is calculated with forgoing models for validating and analyzing their correctness; finally recommendation and conclusion with theoretical research value and factual engineering meaning are drawn.