Method and device for determining permeability of carbonate rocks

Abstract

The invention discloses a method and a device for determining permeability of carbonate rocks. The method comprises the following steps: reading CT scanned pictures of carbonate rocks; binarizing the CT scanned pictures of the carbonate rocks, and reading binarized images of a porous medium in the carbonate rocks from the CT scanned pictures of the binarized carbonate rocks; building a physical model of the carbonate rocks according to the binarized images of the porous medium; performing physical-field initialization, inner-node collision and migration and boundary point treatment on the physical model of the carbonate rocks; according to the treated physical model of the carbonate rocks, calculating the macroscopic quantity of the carbonate rocks; according to the Darcy's formula, using the macroscopic quantity of the carbonate rocks to solve the permeability of the carbonate rocks. The method and the device can quickly and accurately determine the permeability of the carbonate rocks.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to a method and a device for determining the permeability of carbonate rock. 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 of the core under ...

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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