Method and device for determining capillary pressure of carbonate rock

Abstract

The invention discloses a device and a method for determining capillary pressure of carbonatite. The method includes: reading porous medium binary images of the carbonatite; analyzing a core pore throat structure of the carbonatite according to the porous medium binary images of the carbonatite, and determining pore diameters; calculating a pore density distribution function of the carbonatite according to the core pore throat structure of the carbonatite and the pore diameters; determining the capillary pressure of the carbonatite according to the pore density distribution function of the carbonatite. By the device and the method for determining the capillary pressure of the carbonatite, the capillary pressure of the carbonatite can be determined accurately and quickly.

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 capillary pressure 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 logging data, mercury injection It is difficult to accurately and quickly obtain the capillary pressure of the rock core by methods such as methods. The conventional logging data and mercury injection method are described below. [0003] One of the microscopic analysis techniques in the study of flow law: conventional logging data. [0004] Calculate, count and regress the exponential capillary pressure curve with logging data. This method considers that the height of water rising along the water-wet capillary pressure is...

AI Technical Summary

Problems solved by technology

The disadvantage of this analysis method is that it relies on well logging data and is prone to errors

[0005] 1. Conventional well logging data requires professional and technical personnel to interpret, which is highly dependent on the technical level and experience of the operator. The correctness of the data will directly affect the calculation result of the capillary pressure; different, the analysis results may be different;

[0006] 2. Logging data is not easy to obtain

[0010] 1. During the mercury injection experiment, the mercury used is poisonous and will cause harm to the human body and the environment;

[0011] 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;

[0012] 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

[0013] 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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