Experimental evaluation system for dynamic capillary force of reservoir rocks

Abstract

The invention discloses an experimental evaluation system for a dynamic capillary force of reservoir rocks. The experimental evaluation system comprises a rock core holder module, a pressure testing module and a saturation testing module, wherein the rock core holder module comprises a cylinder body, a taper sleeve, a rubber jacket, a plug, a pressure cap, a rock core plug, adjusting screw caps and a rock core connecting column; the pressure testing module comprises a measuring point pressure cap, a pressure measuring point pressure cap, a pressure measuring point gasket, a semipermeable partition plate, a small pipeline and a measuring point connector; the saturation testing module comprises an electrode, an electrode upper washer and an electrode lower washer. The experimental evaluation system disclosed by the invention is low in production cost and testing cost; the dynamic capillary force of the reservoir rocks can be evaluated under the condition of oil deposits, and an accurate reliable basis is provided for formulating and implementing a development scheme of an oil field.

Description

technical field [0001] The invention belongs to the technical field of laboratory experiments for oil and gas field development; in particular, it relates to an experimental evaluation system for dynamic capillary force of oil reservoir rocks. Background technique [0002] Capillary force (capillary pressure) refers to the surface additional pressure generated in the capillary that causes the liquid level to rise or fall. The capillary force points in the direction of the concave surface of the liquid, and its magnitude is proportional to the surface tension of the liquid and inversely proportional to the capillary radius. Capillary force is often manifested as the pressure difference on both sides of the curved interface of two-phase immiscible liquids (such as oil and water) in the capillary pores of formation rocks. It is the necessary data for the study of rock pore structure and two-phase seepage in rocks. one of the important contents. [0003] There are many methods...

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Problems solved by technology

[0004] At present, there are few systems for evaluating the dynamic capillary force of reservoir rocks, and most of the evaluation objects are sand-packing models, which are carried out at normal temperature and low pressure, which cannot reflect the dynamic capillary force in real reservoir rocks

The few devices that can evaluate the dynamic capillary force of real reservoir cores under reservoir conditions are expensive, such as scanning the core section by CT scanning equipment to obtain oil saturation (Wang Shuoliang, Zhao Yingying, Yu Chunlei, etc. A dynamic capillary force of reservoirs Curve measurement method and equipment [P]. Chinese patent: CN105372150A, 2016-03-02), and the test cost is also high

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