Rock core sealing device and sealing method thereof

Abstract

The invention discloses a core sealing device and a sealing method thereof. The core sealing device comprises an outer barrel, a lead inner barrel and a plurality of lead inner barrel supports. One end of the outer barrel is provided with a fixed end cover in a sealing mode, and the other end of the outer barrel is provided with a movable end cover in a sealing mode. A plurality of pressure measurement holes are formed in the barrel wall, close to the movable end cover, of the outer barrel along the circumferential direction. The upper end of the outer barrel is provided with an air hole, and the lower end of the outer barrel is provided with a confining pressure hole. The lead inner barrel is arranged inside the outer barrel in a penetrating mode. A plurality of pressure measurement sealing holes are formed in the lead inner barrel. The pressure measurement sealing holes and the pressure measurement holes are communicated. One end of the lead inner barrel is provided with a sealing block in a sealing mode, and the other end of the lead inner barrel is connected with the movable end cover. The plurality of lead inner barrel supports are arranged at equal intervals between the lead inner barrel and the outer barrel. The core sealing device and the sealing method thereof can effectively guarantee sealing performance of core groups under a high-temperature and high-pressure environment, and improve experimental success rates.

Description

technical field [0001] The invention relates to a sealing device and a sealing method, in particular to a rock core sealing device and a sealing method suitable for gas injection development experiments in the technical field of petroleum development experiments. Background technique [0002] Core gas injection experiment is one of the most basic and widely used research methods. The research objectives mainly include the oil displacement efficiency of parity injected gas, the effect of displacement method on recovery factor, and the seepage characteristics of fluid in the core, etc. In the experiment, the devices and methods for sealing the core have always been valued by researchers, which to a certain extent determine the success rate of the gas drive experiment. [0003] At present, the core sealing device for gas injection experiments is mainly composed of a colloidal sealing cylinder and a holder clamped outside the colloidal sealing cylinder. The colloidal sealing cyl...

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Problems solved by technology

[0004] With the improvement of gas drive test conditions, the existing core sealing device for gas injection test has the following defects, which can no longer meet the requirements of the current gas drive test:

[0005] 1) The core needs to be tested in a high-temperature and high-pressure environment, and in a high-temperature and high-pressure environment, the colloidal sealing cylinder that seals the core is prone to plastic deformation under the erosion of corrosive gas / fluid for a long time, resulting in core sealing. Ineffective, unable to meet the smooth progress of the experiment;

[0006] 2) The gas injected into the core is mostly corrosive, such as carbon dioxide gas, etc., the corrosive gas will corrode the colloidal sealing cylinder where the core is placed, and affect the service life of the colloidal sealing cylinder. After two or more times of use, its mechanical properties will decrease, which will easily lead to failure of the core seal;

[0007] 3) The study of core displacement characteristics needs to set multiple pressure measuring points on the colloidal sealing cylinder to monitor the pressure of the core. The minimum distance between pressure points is limited, which cannot meet the multi-point pressure measurement requirements required by the experiment;

[0008] 4) In the prior art, sealing gaskets and pipelines are installed in the pressure measuring holes opened on the rubber sealing cylinder as the pressure measuring points. , the gasket is easily plastically deformed, which leads to the failure of the experiment

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