Method for optimizing gas-water relative permeability curve of gas storage by applying two-dimensional experiment

Abstract

The invention discloses a method for optimizing a gas-water relative permeability curve of a gas storage by applying a two-dimensional experiment, and the method comprises the following steps: S1, making a two-dimensional large-scale plane rock plate model, and carrying out gas logging on permeability; S2, filling a plane rock plate, and saturating experimental fluid; S3, carrying out multiple rounds of gas injection and production experiment tests in the two-dimensional sand filling model; S4, carrying out calculation by applying a plane radial flow formula, analyzing the productivity rule change presented in the experimental process, and optimizing, calculating and analyzing the model; and S5, calculating the water saturation according to the recovery degree, and constructing a relative permeability curve in combination with the calculated effective permeability. Therefore, the obtained relative permeability curve is more matched with the actual mine field, the partial limitation of small core testing is reduced, and the accuracy of the relative permeability curve in the analysis of the gas production capacity of the gas storage of the water-invaded gas reservoir is improved. The method solves the problem that high-efficiency operation of the gas storage is limited due to reservoir seepage capacity change caused by multi-cycle injection and production in the production and operation process of the gas storage.

Description

technical field [0001] The invention relates to the technical field of the petroleum industry, in particular to a method for optimizing the gas-water phase permeability curve of a gas storage by using a two-dimensional experiment. Background technique [0002] The establishment of gas storage can change the inherent contradiction between natural gas supply and consumption in my country, that is, the inherent contradiction between reliable, safe, stable, continuous gas supply and unbalanced consumption demand. At present, my country's natural gas dependence on foreign countries has exceeded 40%. For the normal gas consumption of users in the delta region, my country has stepped up the construction of gas storage facilities. [0003] For the construction of gas storage, one of the main problems is that the effective storage capacity of the constructed gas storage meets the demand; the so-called effective storage capacity of the gas storage is based on the working conditions of...

AI Technical Summary

Problems solved by technology

(Shi Lei, Liao Guangzhi, Xiong Wei, etc. Mechanism of two-phase seepage of gas and water in water drive sandstone gas reservoir type underground gas storage[J]. Natural Gas Industry, 2012, 9: P85-87; Sun Junchang, Xu Hongcheng, Wang Jieming. Gas reservoir type underground Injection-production mechanism and evaluation key technology for gas storage construction[J]. Natural Gas Industry, 2018, 38(4): 138-144; Application [J]. Natural Gas Industry, 2016,36(5):58-61) found that after multiple rounds of interflooding, the seepage capacity of the core decreased significantly, the irreducible water saturation increased and other influencing factors, and such relative permeability curve The test method does not accurately reflect the real mode of injection-production operation of the gas storage, but only discusses the influence of multiple rounds of mutual flooding on the capacity and seepage capacity of the gas storage from a regular perspective.

[0004] At present, there is no research on using actual simulation technology to describe the injection-production operation mode of the gas storage, let alone based on the data understanding of the simulation experiment, combined with the means of plane radial flow to conduct the phase permeability curve of the gas storage injection-production process describe

Images