Device and method for measuring fluid saturation pressure and seepage capacity in porous media

Abstract

The invention provides a device and method for measuring fluid saturation pressure and seepage capacity in porous media, the device comprising: a high temperature and high pressure core holder, a bidirectional piston pump, a volume adjustment device, a pressure acquisition device and a differential pressure acquisition device; wherein , the volume adjustment device includes a chamber and a piston, one side of the piston is an effective chamber, and the piston can move in the chamber to adjust the volume of the effective chamber; wherein, the liquid to be tested flows into the two-way piston pump through the effective chamber, and the two-way piston pump makes The liquid to be tested flows through the core sample in the high temperature and high pressure core holder; the pressure acquisition device is used to collect the real-time pressure of the test liquid, and the pressure acquisition end of the pressure difference acquisition device is set on both sides of the high temperature and high pressure core holder , used to detect the pressure difference before and after the fluid to be tested flows through the core sample. The device can accurately measure fluid saturation pressure and seepage capacity in porous media.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration and development, and more specifically relates to a device and method for measuring fluid saturation pressure and seepage capacity in porous media. Background technique [0002] In the field of oil and gas reservoir development, fluid saturation pressure refers to the pressure when the pressure drops to the point where the gas begins to separate from the liquid phase under formation conditions. For oil reservoirs, the saturation pressure is usually called the bubble point pressure, and for condensate gas reservoirs, the saturation pressure is usually called the dew point pressure. Saturation pressure is a turning point for the change of fluid physical properties. Before and after saturation pressure, the gas-oil ratio, volume coefficient, compressibility coefficient, viscosity, etc. of the fluid will change significantly, thus affecting the flow ability of the fluid in porous media. In addi...

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Problems solved by technology

It can accurately measure the saturation pressure of the fluid in the porous medium, and evaluate the seepage capacity of the fluid before and after the saturation pressure, which meets the requirements of the oil and gas reservoir development experiment, and solves the problem that the influence of the porous medium cannot be considered when measuring the saturation pressure with the PVT cylinder, and the accuracy of other measurement methods is low. The problem of expensive equipment and complicated operation is to provide rapid and reliable experimental data for production and scientific research. The device is small in size and easy to operate, and can quickly obtain accurate results, and at the same time obtain the evaluation results of fluid seepage capacity

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