Experimental system for representing interlayer interference degree of reservoir

Abstract

The invention discloses an experimental system for representing the interlayer interference degree of reservoirs, which comprises a constant-pressure constant-speed pump, a first six-way valve, a simulated formation water storage tank, a simulated formation oil storage tank and a second six-way valve, and is characterized in that the first six-way valve is connected with the simulated formation water storage tank and the simulated formation oil storage tank respectively; the input end of the second six-way valve is connected with the simulated formation water storage tank and the simulated formation oil storage tank, and the output end of the second six-way valve is connected with the multiple sets of clamping devices in a one-to-one correspondence mode. Plugging mechanisms are arranged at the two ends of the clamping pipe body, and a fine adjustment mechanism is arranged on the outer circumferential wall of the rubber sleeve. According to the method, the rock core sample holders are optimally designed, confining pressure application is assisted, it is ensured that the outer wall of the rock core sample on each holder is stressed uniformly, and the transverse and longitudinal structures of the rock core holders are randomly combined according to the characteristics of a target reservoir to meet the layer series development guidance of any oil reservoir so as to ensure the accuracy of data obtained by a simulation experiment.

Description

technical field [0001] The invention relates to the technical field of core displacement experiments, in particular to an experimental system for characterizing the degree of interlayer interference in reservoirs. Background technique [0002] Layered extraction technology is an enhanced oil recovery measure widely used in oil and gas field development. The interlayer interference problem exists due to the serious vertical heterogeneity of the reservoir and the large coefficient of variation of the interlayer permeability. When oil wells with interlayer interference problems are produced in multi-layer commingled production, the high-permeability production layers will inhibit the development of low-permeability production layers to varying degrees, resulting in the production of multiple oil layers during commingled production is much smaller than the production of each layer when they are produced individually. sum. Therefore, the degree of interlayer interference is exp...

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Problems solved by technology

[0004] First, on the device, there is only one experimental core for simulating a single-layer reservoir, which cannot effectively simulate the lateral interference of the porosity and permeability of each oil layer in the actual reservoir;

[0005] Second, the cores for simulating multiple reservoirs are not connected to each other vertically, that is, only the reservoirs with less severe channeling in the vertical direction are simulated, but the reservoirs with interlayer interference cannot be effectively simulated;

[0006] Third, the current test method for the degree of interlayer interference has limitations and cannot fully cope with various types of reservoirs;

[0007] Fourth, when the confining pressure is applied to the core sample, when the pressure generated by the pressurized fluid acts on the outer wall of the core sample, it is easy to cause uneven stress on the core sample, which in turn leads to the infiltration test of the core sample. Errors occur, which is not conducive to obtaining accurate parameter data in simulation experiments

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