Liquid collecting device for rock core fluid full-surface saturation and full-surface saturation method

Abstract

The invention provides a liquid collecting device for rock core fluid full-surface saturation and a full-surface saturation method. The upper portion of the liquid collecting device is connected witha rock core clamping device with the open bottom in fixed and sealed modes, a rock core is fixed into an inner cavity of the rock core clamping device, and the liquid collecting device comprises a pressure-bearing connector connected with the bottom of the rock core clamping device in sealed and fixed modes. The lower portion of the pressure-bearing connector is in sealed connection with a constant-pressure liquid collecting cylinder, a piston type connector is sealed in the pressure-bearing connector in a penetrating mode, and the top of the piston type connector extends into a bottom openingof the rock core clamping device and connected into the inner cavity of the rock core clamping device in a sealed mode. The bottom of the piston type connector extends into an inner cavity of the constant-pressure liquid collecting cylinder. A center passage is formed in the piston type connector, and a piston is slidably arranged in the center passage. The side wall of the constant-pressure liquid collecting cylinder is provided with a saturation oil passage, and the bottom of the constant-pressure liquid collecting cylinder is provided with a liquid discharging outlet capable of being closed. According to the liquid collecting device for rock core fluid full-surface saturation and the full-surface saturation method, the full surface of the rock core can make contact with water / oil, theflow seepage speed is high, and the volumes of the saturated water and the saturated oil can be accurately measured.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a liquid collecting device and a full surface saturation method suitable for fluid full surface saturation of rock cores of ultra-low and ultra-low permeability. Background technique [0002] Most of the oil reservoirs in China are formed under the hydrodynamic environment. Therefore, the first step in simulating the development of oil reservoirs in the laboratory is to simulate the formation of oil reservoirs. The usual practice is to saturate the core with formation water first, and then saturate the core with crude oil, so as to form a core-scale simulated reservoir. The industry standard for oil and gas reservoir classification (SY-T6169-1995) has determined that the permeability of low-permeability reservoirs is 10-50mD, and the permeability of ultra-low-permeability reservoirs is <10mD (Li Daopin's "Low Permeability Oilfield Development" book It further ill...

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Problems solved by technology

[0008] The object of the present invention is to provide a liquid collecting device and a method for full surface saturation of the fluid of the rock core, which overcomes the problems of small contact area, slow seepage velocity, and large measurement error in the prior art, and can make the entire surface of the rock core In contact with water / oil, the seepage speed is fast, and the liquid collection device can accurately measure the volume of saturated water and saturated oil

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