Carbonatite gas and water relative permeability determination method and device

Abstract

The invention discloses a carbonatite gas and water relative permeability determination method and device. The method includes determining the distribution of pores of carbonatite; determining the gas phase and water phase flow velocities of the pores; determining the gas phase and water phase flow of the pores; according to the gas phase and water phase flow velocities and the gas phase and water phase flow of the pores, determining the carbonatite gas and water relative permeability. According to the method, manual intervention is omitted, water or mercury injection is omitted, and the defects of long time and large errors can be solved during carbonatite gas and water relative permeability determination.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a method and a device for determining the gas-water relative permeability of carbonate rocks. Background technique [0002] For the research on the development of pores, vugs and fractures in carbonate rock reservoirs, there are few research methods and knowledge on the microscopic flow of pores, vugs and fractures in carbonate rock reservoirs, and conventional displacement experiments, mercury injection It is difficult to obtain the relative permeability of the core accurately and quickly by means such as method. Next, the displacement experiment and the mercury porosimetry will be described. [0003] 1. One of the microscopic analysis techniques in the study of flow law: displacement experiment. [0004] The displacement experiment is to fill the core with saturated brine, then put it into the core holder, set the flow rate, measure the pressure at the inlet end...

AI Technical Summary

Problems solved by technology

The disadvantage of this analysis method is that it takes a long time and errors are prone to occur in the experimental process.

[0005] 1. The use of displacement experiments to measure the permeability of rock cores requires professional and technical personnel to interpret, and is highly dependent on the technical level and experience of the operators. The accuracy of the instrument will directly affect the quality of the displacement results; in actual work, due to the operator, Depending on the camera parameter settings, etc., the analysis results may be different;

[0006] 2. Long measurement time

Due to the poor connectivity and strong heterogeneity of carbonate rock, it takes a long time to do a set of displacement experiments. If there is an error, it needs to be re-measured. will cause test errors;

[0007] 3. During the displacement process, only some real-time data, time and flow can be recorded, and the displacement process cannot be observed dynamically in real time, and the real fluid flow law cannot be reflected

[0011] 1. During the mercury injection experiment, the mercury used is poisonous and will cause harm to the human body and the environment;

[0012] 2. The pore structure characteristics of the rock obtained by the mercury injection method is an average parameter, and the quantitative distribution characteristics of pore throats of different sizes cannot be obtained;

[0013] 3. During the mercury injection experiment, the mercury injection process will destroy the original pores and the clay minerals inside, which cannot reflect the real rock pore structure characteristics

[0014] 4. During the mercury injection experiment, only some real-time data can be recorded, and the displacement process cannot be observed dynamically in real time, and the real fluid flow law cannot be reflected

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