Experimental device and method for simulating heterogeneous reservoir CO2 flooding injection-production coupling

Abstract

The invention discloses an experimental device and method for simulating heterogeneous reservoir CO2 flooding injection-production coupling. The experimental device comprises a displacement pump, intermediate containers, a core holder, a back-pressure valve, a back-pressure pump, a confining pressure pump and a measuring cylinder, wherein the intermediate containers comprise an intermediate container for containing an oil sample and an intermediate container for containing CO2. The experimental method comprises the following steps of: configuring the oil sample and a water sample for an experiment; testing the basic physical property of a core; establishing irreducible water saturation; keeping the formation condition to simulate reservoir formation aging; testing a CO2 injection-production coupling experiment; metering the pressure change of an injection end, the volumes of flooding oil and gas and the volume of accumulated injection gas in the displacement process; and evaluating the capacity of improving the recovery ratio of a heterogeneous reservoir in different injection-production coupling modes. The capacity of improving the recovery ratio of the heterogeneous reservoir in different injection-production coupling modes can be evaluated, and theoretical guidance is provided for oil field and mine field application.

Description

technical field [0001] The invention relates to the field of oil and gas field development engineering, in particular to a method for simulating heterogeneous reservoir CO 2 Flooding-injection-production coupling experimental device and method. Background technique [0002] With the continuous increase of my country's oil demand, it has been proven that the oil and natural gas production of conventional oil reservoirs cannot meet the needs of national consumption growth, and the contradiction between supply and demand has become increasingly prominent. Therefore, rational and large-scale exploitation of unconventional oil reservoirs is an urgent problem to be solved in my country, which plays an important role in the development of my country's petroleum industry. [0003] For low-permeability reservoirs, due to the small pores of the reservoir, water flooding is difficult to effectively implement, while chemical flooding is likely to cause irreversible damage to the origin...

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Problems solved by technology

[0005]Currently published research mainly focuses on the optimal design of injection-production process parameters for actual reservoir conditions using numerical simulation methods, and the main research areas focus on water injection coupling. There are few studies on gas injection coupling, and there is a lack of experimental methods to evaluate the effect of CO2flooding injection-production coupling to enhance oil recovery under interlayer heterogeneity in low-permeability reservoirs

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