Determination device and method of constraint irreducible water saturation in reservoir rock core

Abstract

The invention discloses a determination device and method of constraint irreducible water saturation in a reservoir rock core. The device mainly comprises a high-pressure nitrogen source, a humidifier, a rock core holding device, an oil-water displacement pump, a loop pressure pump, a return pressure control pump, a gas metering instrument and a liquid metering instrument, wherein the rock core clamping device is arranged in a constant-temperature box; the high-pressure nitrogen source is connected with the inlet end of the rock core clamping device through the humidifier; the oil-water displacement pump is also connected with the inlet end of the rock core clamping device through an oil-water displacement control valve; the loop pressure pump is connectd with the rock core clamping device through a loop pressure control valve, and applies confining pressure to the rock core; and the outlet end of the rock core clamping device is connected with the return pressure control pump, and is also connected with the gas metering instrument and the liquid metering instrument respectively. The device is reliable in principle, is reasonable in structure, and is simple and convenient to operate, is utilized for determining the constraint irreducible water saturation in the reservoir rock core, can achieve the highest pressure of 70Mpa and the highest temperature of 150 DEG C, and remedies the defects of an existing gas reservoir log analysis and gas well production dynamic analysis method as well as the technique application.

Description

technical field [0001] The invention relates to a device and method for measuring the saturation of constrained water in the core of a gas reservoir reservoir, and is especially suitable for measuring the movable water saturation and the saturation of the restrained water in the high-temperature and high-pressure environment of the porous medium core of the gas reservoir in the oil and gas industry. Experimental apparatus and method for water saturation. Background technique [0002] The definition and physical meaning of "constrained unbound water saturation" is: in the process of gas accumulation, under the restriction of capillary pressure, the movable water saturation that needs to be activated and restored to flow under a certain displacement pressure gradient, We call it the bound bound water saturation. Its physical meaning is that after the gas reservoir is put into development, the original equilibrium coexisting water of the restricted gas reservoir is under a cer...

AI Technical Summary

Problems solved by technology

At present, the well-known methods for measuring the water saturation of gas reservoir cores include the test of movable water saturation and the test of irreducible water saturation, but no experimental test of constrained irreducible water saturation has been clearly established.

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