Capillary pressure curve construction method and device

Abstract

The invention relates to the technical field of oil and gas reservoirs, and discloses a capillary pressure curve construction method and device and a computer storage medium. The method comprises thefollowing steps: according to the displacement effect of air in core pores on fluid in the centrifugal process, calculating the centrifugal radius and the length of a fluid area, and calculating capillary pressure in different displacement states in the centrifugal process according to the centrifugal radius and the length of the fluid area; calculating the average capillary pressure of the core pores in different displacement states according to the capillary pressure in different displacement states; calculating an average capillary pressure formula of the rock core in different displacementstates in combination with the average capillary pressure of the rock core pores in different displacement states; and obtaining the water saturation in the rock core sample detected by the centrifugal experiment, and constructing a rock core capillary pressure curve in combination with an average capillary pressure formula of the rock core. According to the method and device, the displacement effect of air on the fluid is considered when the capillary pressure in the centrifugal process is calculated, and the constructed capillary pressure curve is higher in precision.

Description

Technical field [0001] The invention relates to the technical field of oil and gas reservoir evaluation, in particular to a method and device for constructing a capillary pressure curve and a computer storage medium. Background technique [0002] The relationship between the capillary pressure of the core and the saturation of the wet phase fluid in the pore is called the capillary pressure curve. Due to the complex pore structure of the rock, the capillary pressure curve is difficult to obtain by theoretical derivation, and it needs to be measured by experimental methods such as semi-permeable baffle method, mercury injection method, and centrifugal method. Among them, the mercury intrusion method is often irreversible to the core damage, which is not conducive to the continuous measurement of other core parameters; the semi-permeable baffle method is a method often used at present, but the semi-permeable baffle is relatively expensive and easy to wear; In other words, the cent...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a capillary pressure curve construction method, device and computer storage medium, to solve the problems in the prior art that do not consider the change of the fluid in the pore capillary during the centrifugation process, resulting in the capillary pressure constructed The technical problem of low curve accuracy

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