A method for describing carbon dioxide flooding front
A carbon dioxide and leading-edge technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as difficult to determine the miscible state of carbon dioxide
Active Publication Date: 2021-12-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, in actual reservoir simulation, it is difficult to determine the miscible state of carbon dioxide with a single interfacial tension index, and it is impossible to comprehensively and systematically determine the carbon dioxide displacement front of the reservoir during the carbon dioxide displacement process only through the gas phase saturation. What is the state of the region, and how the various states change and transform in real time
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[0044] The method comprises the steps of:
[0045] (1) Determine the miscible pressure front, carbon dioxide component front and carbon dioxide gas phase front in the process of carbon dioxide flooding;
[0046] The method of determining the miscible pressure front is as follows: according to the formation pressure distribution obtained from the numerical simulation calculation results, the outer boundary of the area where the formation pressure is greater than the minimum miscible pressure in each simulated layer is determined as the miscible pressure front.
[0047] The method of determining the carbon dioxide component front is: according to the component mole fraction distribution obtained from the numerical simulation calculation results, the outer boundary of the area where the carbon dioxide component mole fraction is greater than 0 in each simulated layer is determined, and the carbon dioxide component front is determined.
[0048] The method for determining the gas ph...
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The invention relates to the technical field of reservoir development, in particular to a carbon dioxide flooding front description method. The method includes the following steps: (1) determining the miscible pressure front, the carbon dioxide component front and the carbon dioxide gas phase front during the carbon dioxide flooding process; (2) according to the three fronts determined in step (1), the reservoir Divided into four areas: carbon dioxide gas area, miscible area, miscible potential area, and unswept area; (3) Record the changes in the positions of the three fronts mentioned in step (1) at different time points, and calculate the movement of the three fronts Velocity: According to the movement of different fronts, quantitatively describe the changes of the four regions, and identify the dynamic changes of the miscible state during the carbon dioxide flooding process. This method, combined with technologies such as well testing and monitoring, can achieve accurate fitting and prediction of underground oil and gas displacement, and provide technical support for preventing carbon dioxide gas channeling and improving oil displacement effects.
Description
technical field [0001] The invention relates to the technical field of reservoir development, in particular to a carbon dioxide flooding front description method. Background technique [0002] Carbon dioxide flooding is an important method to enhance oil recovery, especially for low-permeability reservoirs, because water is difficult to inject, and carbon dioxide can generally reach a supercritical state underground, with the density of liquid and the viscosity of gas, so it is easy to inject. And it is easy to miscible with crude oil to greatly improve the oil displacement efficiency. In the process of carbon dioxide flooding, carbon dioxide gas dissolves in crude oil in one contact, causing the volume of crude oil to expand and the viscosity to decrease. As carbon dioxide gas gradually moves to the production well, the light components of crude oil are extracted or vaporized by carbon dioxide gas, forming a multi-contact miscible phase or near miscibility, the interfacial...
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IPC IPC(8): E21B43/16E21B49/00
CPCE21B43/164E21B49/00
Inventor 杨勇杜玉山张世明吕广忠于金彪曹伟东董亚娟赵莹莹王杰张波
Owner CHINA PETROLEUM & CHEM CORP