A method and device for simulating differential water injection in heterogeneous reservoirs in the laboratory

Abstract

A method and device for simulating differential water injection in a heterogeneous reservoir in a laboratory. The main purpose is to solve the problem of the lack of an effective experimental method that can simulate differential water injection experiments for heterogeneous reservoirs. It is characterized in that: the device is composed of an advection pump, a multi-way valve, a core holder and a number of flow control valves connected to a pressure gauge; the core holder has a shell, a left fastening sleeve, a right fastening sleeve, a left fixed The sleeve, the right fixed sleeve, the left plug of the core, the right plug of the rock core and the rubber tube; the left plug of the rock core is a cylinder with several independent and disconnected parallel liquid flow channels inside, and the right end is fixedly connected with the water injection limit ring The core clamping ring with the same height; the right head of the core is a solid cylinder with a liquid outlet channel in the center, the central hole of the water blocking baffle runs through the liquid outlet channel, and the heterogeneous core model is located in the rubber tube. In the cavity, the two ends are clamped and fixed by the left and right plugs of the rock core.

Description

technical field [0001] The invention relates to a laboratory simulation test method and a special device applied in the field of oil and gas field development. Background technique [0002] In oilfield development, oil reservoir heterogeneity is one of the important factors affecting oilfield development. Due to the existence of reservoir heterogeneity, the permeability at each point of the reservoir is not completely the same. There are obvious differences in seepage characteristics between layers and layers. In water injection reservoirs, the injected water flows along the high porosity and high permeability zones, large pore throats or fractures, causing the matrix, low porosity and low permeability zones to flow. The degree of oil and gas recovery is low or even non-existent. For reservoirs with severe heterogeneity, the conventional water flooding development method has poor oil displacement effect and low oil recovery. Inject water to evenly displace remaining oil. H...

AI Technical Summary

Problems solved by technology

[0002] In oilfield development, oil reservoir heterogeneity is one of the important factors affecting oilfield development. Due to the existence of reservoir heterogeneity, the permeability at each point of the reservoir is not completely the same. There are obvious differences in seepage characteristics between layers and layers. In water injection reservoirs, the injected water flows along the high porosity and high permeability zones, large pore throats or fractures, causing the matrix, low porosity and low permeability zones to flow. The degree of oil and gas recovery is low or even non-existent. For reservoirs with severe heterogeneity, the conventional water flooding development method has poor oil displacement effect and low oil recovery. Water injection, balanced displacement of remaining oil

However, how to carry out differential water injection on heterogeneous reservoirs is currently a difficult problem that plagues the industry. Every time a field experiment plan is determined and implemented, a large amount of financial, material and manpower needs to be invested.

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