--> --> Equivalent Capillary-Based Liquid Phase Invasion Model for Low Permeability Gas Reservoirs
[First Hit]

Petroleum Drilling Techniques, Issue 1, 2019

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Equivalent Capillary-Based Liquid Previous HitPhaseNext Hit Invasion Model for Low Permeability Gas Reservoirs

Abstract

The goal of this study was to avoid formation damage by finding a better way to map the flow of fluids through pore networks in tight sandstones. In order to investigate the flow mechanism of liquid Previous HitphaseNext Hit invasion in low permeability gas reservoirs from the microscopic scale, a pore network model of tight sandstone was established by using laser etching technology. In that way, the microscopic visualization flow experiment of liquid Previous HitphaseNext Hit invasion was carried out, and the dynamic aqueous Previous HitphaseNext Hit distribution in the pore network during the process and fluid flow back was analyzed. The liquid Previous HitphaseNext Hit invasion microscopic flow model for low permeability gas reservoirs was established based on equivalent capillary beam, and the model was verified by aqueous Previous HitphaseNext Hit self-absorption invasion experiment in tight sandstone. Experimental results showed that the rule of aqueous Previous HitphaseNext Hit invasion in the pore network is similar to that of capillary force invasion. The liquid Previous HitphaseNext Hit mainly flows through larger pores initially, and then advances through the throats communicating with the pores gradually; It is difficult for the aqueous Previous HitphaseNext Hit in the smaller throat to flow back, which can hinder the flow of gas Previous HitphaseNext Hit. The research suggested that viscous drag plays a dominant role in the invasion of aqueous Previous HitphaseNext Hit in tight sandstone; the liquid Previous HitphaseNext Hit can still invade the core under negative pressure difference. Further, the denser the rock, the greater the maximum invasion depth of aqueous Previous HitphaseNext Hit would be. The established liquid Previous HitphaseNext Hit invasion model will provide a theoretical reference in studying liquid Previous HitphaseTop invasion damage and protection mechanism of low permeability gas reservoirs.