Carbon dioxide flooding front edge description method
A carbon dioxide and leading-edge technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as difficult to determine the miscible state of carbon dioxide, and achieve the prevention and control of carbon dioxide gas channeling, accurate fitting and prediction, and improved flooding. The effect of the oil effect
Active Publication Date: 2020-06-19
CHINA PETROLEUM & CHEM CORP +1
View PDF14 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to the technical field of oil reservoir development, in particular to a carbon dioxide flooding front edge description method. The method comprises the following steps of (1) determining a miscible pressure leading edge, a carbon dioxide component leading edge and a carbon dioxide gas phase leading edge in a carbon dioxide oil displacement process; (2) according to the threeleading edges determined in the step (1), dividing an oil reservoir into four areas, namely a carbon dioxide gas area, a mixed-phase area, a mixed-phase potential area and an unswept area; and (3) recording the change conditions of the positions of the three leading edges in the step (1) at different time points, calculating the moving speeds of the three leading edges, quantitatively describing the change conditions of the four areas according to the movement conditions of the different leading edges, and judging the dynamic change condition of the miscible state in the carbon dioxide flooding process. The method is combined with well testing monitoring and other technologies, accurate fitting and prediction of the underground oil and gas displacement effect can be achieved, and technicalsupport is provided for preventing and treating carbon dioxide gas channeling and improving the oil displacement effect.
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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
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