Method and device for determining moving speed of oil-gas interface of condensate gas cap reservoir
A technology of oil and gas interface and moving speed, which is used in earth-moving drilling, measurement, wellbore/well components, etc., and can solve problems such as loss of crude oil resources, easy intrusion of condensate gas into the oil ring, and reduction of oil production capacity of oil wells. achieve the effect of improving computing efficiency
Active Publication Date: 2021-09-17
PETROCHINA CO LTD
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Problems solved by technology
When the pressure of the condensate gas cap is higher than the pressure of the oil ring, the condensate gas in the gas cap easily intrudes downward into the oil ring, which will cause gas channeling in the oil wells near the oil-gas interface and reduce the oil production capacity of the oil well; and when the oil ring When the pressure is higher than the pressure of the gas cap, the crude oil in the oil ring will intrude upward into the gas cap, and the intruded crude oil is in a dispersed state and cannot be easily extracted to the ground, thus causing the loss of some crude oil resources
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[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.
[0026] In order to facilitate the understanding of the technical solution provided by the present application, the relevant content of the technical solution of the present application will be described below first. In the embodiment of the present invention, it is assumed that the condensate gas cap and the bottom oil ring in the condensate gas cap oil reservoir are in the same pressure system...
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The invention provides a method and a device for determining the moving speed of an oil-gas interface of a condensate gas cap reservoir. The method comprises the steps that the pore change volume of a gas cap area and the pore change volume of an oil ring area are obtained; according to the pore change volume of the gas cap area, the pore change volume of the oil ring area, the total expansion volume of rock in an oil-gas reservoir and a condensate gas cap reservoir material balance equation, the current formation pressure of the condensate gas cap reservoir is obtained, wherein the condensate gas cap reservoir material balance equation is preset; and according to the current formation pressure and the gas cap invasion volume, the moving speed of the oil-gas interface of the condensate gas cap reservoir is obtained. The device is used for executing the method. According to the method and the device for determining the moving speed of the oil-gas interface of the condensate gas cap reservoir, the calculation efficiency of the moving speed of the oil-gas interface in a condensate gas cap reservoir depletion mining mode is improved.
Description
technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method and a device for determining the moving speed of an oil-gas interface in a condensate gas cap reservoir. Background technique [0002] In nature, most of the oil and gas reservoirs with coexistence of free gas and crude oil are condensate gas cap reservoirs. Under deep high pressure conditions, most of the crude oil in condensate gas cap reservoirs has the characteristics of light oil quality. In condensate gas cap reservoirs, generally there are oil-gas-water three-phase or oil-gas two-phase movable fluids coexisting, oil-gas-water is different in gravity, and there are two interfaces between oil-gas and oil-water. [0003] When the condensate gas cap reservoir is put into development, because both oil and gas are in a saturated state, once the formation pressure drops, reverse condensation will occur in the condensate gas cap, resulting in the loss of c...
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IPC IPC(8): E21B47/10
CPCE21B47/10Y02A10/40
Inventor 张安刚范子菲赵伦
Owner PETROCHINA CO LTD