Device and method for determining gas-water relative permeability of low-infiltration dense rock core

Abstract

The invention provides a device for determining the gas-water relative permeability of a low-infiltration dense rock core. The device comprises a gas driving unit, a liquid driving unit, a first six-way valve, a confining pressure pump, a rock core clamping device, a second six-way valve, a liquid measurement unit and a gas measurement unit, wherein the gas measurement unit comprises a dryer, a precision electronic balance and a gas mass flow meter; the outlet end of the dryer is communicated with the gas mass flow meter; the dryer is arranged on the precision electronic balance; the gas driving unit and the liquid driving unit are communicated with the inlet of the rock core clamping device by the first six-way valve; the liquid measurement unit and the inlet end of the dryer are communicated with the outlet of the rock core clamping device by the second six-way valve; and the confining pressure pump is communicated with a confining pressure opening of the rock core clamping device. The invention further provides a method for determining the gas-water relative permeability of the low-infiltration dense rock core, which utilizes the determination device. By virtue of the determination device and the determination method, water-phase data of the outlet end of the rock core can be accurately obtained so that the gas-water relative permeability is accurately obtained.

Description

technical field [0001] The invention relates to a low-permeability compact rock core gas-water relative permeability measuring device and a measuring method, which belong to the technical field of petroleum exploitation. Background technique [0002] The physical parameters of rocks and fluids in reservoirs are important basic data for oilfield development and reservoir engineering research, and are an important basis for compiling oil and gas field development plans, calculating reserves, studying reservoir properties, comparing oil layers, and analyzing oilfield dynamics. Indoor development experiments are the main means to obtain the physical parameters of rock, fluid and the interaction between fluid and rock. The measurement of relative permeability is the most important and basic measurement method and technology in the indoor development experiment. At present, in the petroleum geology industry, in the core analysis and test work, the existing phase permeability test...

AI Technical Summary

Problems solved by technology

But for low-permeability-tight cores, the porosity and permeability are much lower than conventional cores (permeability can be as low as 0.1mD and porosity can be as low as 10%). During the experiment, the gas The amount of water driven out will be very small, so because the accuracy cannot meet the requirements, if the water volume metering tube is still used, the volume of the water phase at the outlet end of the core cannot be accurately obtained, or even cannot be measured at all.

[0005] Therefore, the existing gas-water relative permeability measurement method cannot obtain accurate water phase data at the outlet end of the core, and the experimental results are unreliable or even completely wrong, which limits the application of experimental data

Images