Method and device for calculating dynamic reserves of gas reservoir with water-sealed gas reservoir
A technology of dynamic reserves and calculation methods, which can be used in surveying, earth-moving drilling and production, wellbore/well components, etc., and can solve problems such as difficulties in dynamic reserves of gas reservoirs
Active Publication Date: 2022-01-21
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
At present, due to the unknown reservoir physical parameters of water-sealed gas reservoirs, it is difficult to evaluate the dynamic reserves of such gas reservoirs. Evaluate the gas original geological reserves of gas reservoirs during development
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[0060] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0061] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.
[0062] In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be understood as indicating or implying Its relative importance o...
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The invention discloses a method and a device for calculating dynamic reserves of a gas reservoir. The method is used for the water-sealed gas reservoir and comprises the following steps of: acquiring reservoir physical property parameters of the gas reservoir and production dynamic data of the gas reservoir; acquiring capillary pressure difference between the water-sealed gas reservoir and a main gas reservoir according to the reservoir physical property parameters; acquiring average formation pressure of the water-sealed gas reservoir according to the reservoir physical property parameters, the production dynamic data and the capillary pressure difference; acquiring a natural gas deviation coefficient of the gas reservoir according to the reservoir physical property parameters, the production dynamic data, the formation pressure of the water-sealed gas reservoir and relative density of natural gas; determining an original geological reserve model of the gas reservoir according to an oil-gas material balance equation on the basis of the action of the water-sealed gas reservoir on the main gas reservoir; converting the original geological reserve model of the gas reservoir into a linear fitting model; determining the original geological reserves of the natural gas of the gas reservoir according to the linear fitting model, the reservoir physical property parameters, the production dynamic data, the formation pressure of the water-sealed gas reservoir, the natural gas deviation coefficient of the gas reservoir and a preset reserve ratio.
Description
technical field [0001] The invention belongs to the technical field of gas reservoir development, and in particular relates to a method and device for calculating the dynamic reserves of a gas reservoir with a water-sealed gas reservoir. Background technique [0002] In the process of water intrusion in the water flooding gas reservoir with active water body, after the water invades the gas reservoir, it quickly moves up or invades along the fractures, separating part of the gas reservoir, and the natural gas is surrounded and sealed, forming a water-sealed gas reservoir. gas reservoirs. The gas reservoirs with water-sealed gas reservoirs will lead to the special phenomenon of "increase" of dynamic reserves during the exploitation process, which sometimes occurs in the gas reservoirs of water-sealed gas reservoirs. At present, due to the unknown reservoir physical parameters of water-sealed gas reservoirs, it is difficult to evaluate the dynamic reserves of such gas reservo...
Claims
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IPC IPC(8): E21B49/00E21B47/00
CPCE21B49/00E21B47/00E21B2200/20Y02A10/40
Inventor 石军太李文斌张龙龙贾焰然杨博王田多奕石贵元
Owner CHINA UNIV OF PETROLEUM (BEIJING)