Test device and test method for oil-water relative permeability curve

Abstract

The invention discloses a test device and test method for an oil-water relative permeability curve. The method comprises the steps of stirring and mixing oil and water by an oil-water uniform mixer, collecting a production liquid at interval, measuring mass and volume, and calculating oil-production speed, water-production speed and oil-water relative permeability to obtain the oil-water relativepermeability curve of a core. According to the oil-water relative permeability curve test method by a steady-state method, the oil and the water can be fully mixed in advance by a high-speed stirringeffect of the oil-water uniform mixer, so that the proportion of the oil and water which are injected into the core is more uniform and stable, the true moving state of the oil and water can be more accurately reflected, and the measurement time is shorted; and moreover, by the method, the metering of experiment data is more accurate, the accuracy is higher, and meanwhile, the method more conformsto reality by employing long core with relatively large size to perform simulation experiment in an oil deposit room.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, and in particular relates to a steady-state oil-water relative permeability curve test device and an experimental method based on fluid highly mixed method. Background technique [0002] Relative permeability is a dynamic characteristic parameter of rock-fluid interaction, and is also the most important parameter in reservoir development calculation. Steady-state method is one of the methods for measuring relative permeability curve; the theoretical basis for measuring relative permeability by steady-state method is One-dimensional Darcy flow theory, and ignore capillary pressure and gravity; under the condition of constant total flow rate in the test, oil and water are injected into the rock sample at a constant rate at a certain flow rate, when the displacement pressure and oil and water flow rates are stable , the water saturation of the rock sample no longer changes,...

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Problems solved by technology

[0003] In the process of measuring the relative permeability curve by the current steady-state method, the oil-water two-phase flows into the core after passing through the three-way valve. The problem with this method is that the two fluids of oil and water cannot be fully mixed, resulting in the formation of the injected fluid in the core. Stable flow slug, oil-water two-phase distribution in the rock is random, and the saturation field is stable for too long

The problem with this method is that the oil and water cannot be fully mixed, causing the injected fluid to form different flow channels in the core and the ratio of the injected fluid is unstable. Therefore, the measured oil-water phase-permeability curve cannot accurately reflect the real oil-water flow relationship. , and it takes a long time for oil and water to reach a steady state

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