Experiment method and device for calculating rock core initial charging pressure

Abstract

The invention provides an experiment method for calculating rock core initial charging pressure. The experiment method comprises selecting a rock core, pre-treating the rock core so that a water content state of the rock core is the same to that of a reservoir stratum of a stratum to be exploited, putting the rock core into a rock core clamping device, applying confining pressure for the rock core by a first inlet end of the rock core clamping device, wherein the confining pressure is the same to overburden pressure on the rock core in a stratum state of a stratum to be exploited, increasing pressure based on preset reference pressure according to a preset rule to obtain current charging pressure, feeding gas into the rock core under the current charging pressure by a high-pressure gas source until gas and water in the rock core are in a balanced state, measuring pressure at the outlet end, and when the pressure at the outlet end is the same to the pressure at a second inlet end, acquiring initial discharging pressure according to the pressure at the outlet end, wherein the initial discharging pressure is rock core displacement pressure. The experiment method is a gas reservoir reserve prediction experiment method for accurate prediction of gas reservoir reserve.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to an experimental method and device for calculating the initial filling pressure of rock cores. Background technique [0002] Natural gas is a valuable energy and chemical raw material, which plays an important role in the national economy and is often hailed as the blood of industry. However, natural gas is buried underground and can only be used after exploration and development is found and extracted to the surface. Through exploration and development, it is possible to find underground gas reservoirs that have accumulated natural gas, so that the gas reservoirs can be developed and utilized. [0003] Gas reservoirs do not exist in isolation, but must be interconnected with source rocks, reservoirs, and caprocks. Often, several reservoirs with the same or similar oil and gas generation and accumulation conditions coexist. The source layer is the formation that can produ...

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Problems solved by technology

[0005] Although there are theoretical methods for studying the initial charging pressure of reservoirs in the prior art, these theoretical methods are mainly based on theoretical discussions, which do not comprehensively reproduce various factors in the process of gas accumulation and development, such as Combining the cores with different permeability and water content of the reservoir during the accumulation process, the calculation of the initial charging pressure of the reservoir cannot truly reflect the accumulation process of the gas reservoir, which is different from the use of physical methods to reproduce Compared with the initial charging pressure obtained during the process of gas accumulation and development, it is not accurate enough

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