Method and system for determining gas injection volume in heavy oil production
A technology of gas injection and heavy oil, which is applied in the field of oil exploration and can solve problems such as inability to apply heavy oil
Active Publication Date: 2020-05-22
CHINA UNIV OF PETROLEUM (BEIJING) +1
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[0005] However, this model is derived from the physical parameters of light crude oil with low viscosity, and cannot be applied to heavy oil.
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[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0062] Existing research on multiphase pipe flow mainly focuses on the flow of oil-water or oil-gas two-phase fluid, and most of the research on the flow law of oil-gas-water three-phase mixture also focuses on the flow part of horizontal pipes. In the vertical wellbore, the research on the three-phase flow law is mainly based on the gas-liquid two-phase flow theory, and various mathematical models are established to calculate the pressure drop and friction of ...
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The invention provides a method and system for determining the gas injection rate of heavy oil exploitation. The method includes the steps of utilizing the flowing pressure drop of heavy oil under different viscosities, moisture contents and gas-liquid ratios and using a preset vertical shaft pressure drop model in order to determine the relationship among the viscosity, the water content, the gas-liquid ratio and the flowing pressure drop, obtaining the content of different moisture contents, section gas contents, pressure gradient change rules and other aspects of oil-gas-water phase flow, and accurately determining the gas injection rate of multi-phase flow heavy oil by considering the influences of different proportions of three phases, gradually decreased pressure along a vertical shaft, the frequently variable flowing form, phase distribution and pressure drop of an oil-gas-water phase mixture along a pipeline, the shear thinning effect of the heavy oil at a high flow speed, andthe phase distribution state of gas in crude oil different in viscosity. The method and the system are suitable for actual on-site application, are used for guiding gas injection for heavy oil exploitation and have a high value in engineering application and scientific research.
Description
technical field [0001] The invention relates to the technical field of petroleum exploration, and more specifically, relates to a method, a system, a computer medium and electronic equipment for determining the amount of gas injection in heavy oil production. Background technique [0002] At present, the flow of oil-gas-water three-phase mixture is widely used in petroleum, chemical industry and other related industries, especially in the petroleum industry, the flow of oil-gas-water three-phase mixture is quite common, which makes the study of its flow friction particularly important. However, the research of multiphase flow has considerable complexity: 1. The existence of phase interface increases the complexity of the research; 2. There is mass and energy exchange between phases; 3. The diversity and difficulty of flow patterns in multiphase pipe flow Deterministic; 4. The temperature and concentration of each phase in the flow process are not uniform, and heat transfer a...
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IPC IPC(8): E21B43/16E21B47/06E21B47/00G06Q50/02
Inventor 杨矞琦郭继香熊瑞颖范伟东曹畅任波刘磊邢钰程仲富张帅
Owner CHINA UNIV OF PETROLEUM (BEIJING)