A low permeability reservoir co 2 Calculation Method of Miscible Flooding Ultimate Well Spacing
A calculation method and miscible flooding technology, applied in calculation, wellbore/well components, earthwork drilling and production, etc., to achieve the effect of simplifying the calculation process and reliable calculation results
Active Publication Date: 2021-10-12
SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] The purpose of the present invention is to solve the low permeability reservoir CO 2 Technical problems in the calculation method of miscible flooding limit well spacing, providing a low permeability reservoir CO 2 Calculation Method of Miscible Flooding Ultimate Well Spacing
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 Construction
[0079] The technical scheme of the present invention will be described in detail and clearly below in conjunction with the application of the present invention in a low-permeability oil reservoir in eastern my country. In the actual application process, the present invention presses figure 1 Provides a low permeability reservoir CO 2 Flowchart of calculation method for miscible flooding limit well spacing. The specific operation is shown in the following examples.
[0080] Step S1: Establish low permeability reservoir CO 2 Miscible flood seepage physical model;
[0081] CO 2 Cannot be miscible with crude oil in initial contact, but at sufficiently high formation pressure CO 2 Can be dynamically miscible with crude oil. Crude oil and CO 2 The dynamic miscibility between phases is achieved by the mass transfer of components between phases. When CO 2 When in contact with crude oil, part of the CO 2 Dissolved in crude oil, while CO 2 It also extracts some hydrocarbons f...
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 provides a low permeability reservoir CO 2 Calculation method of miscible flooding limit well spacing. The method includes: according to CO 2 Pure CO divided by changes in fluid properties during miscible flooding 2 vadose zone, CO 2 Concentration attenuation zone and pure oil seepage zone three seepage zones to establish low permeability reservoir CO 2 Miscible flooding seepage physical model; establishment of low permeability reservoir CO 2 Mathematical model of miscible flooding seepage; according to pure CO 2 vadose zone, CO 2 The sequence of concentration attenuation area and pure oil area is sequentially solved for low permeability reservoir CO 2 Miscible flooding mathematical model; programming of key algorithms, drawing low permeability reservoir CO 2 Miscible drive theory chart. This method calculates the limit well spacing based on the advancing distance of the miscible front and the pressure sweep range of the production well, and considers factors such as miscible flow resistance, expected production, fluid physical property changes, etc. The calculation model is closer to the actual properties of the reservoir, and the calculation results are more accurate. To be reliable, it is used to guide the CO 2 Miscible drive development.
Description
technical field [0001] The present invention relates to the technical field of oil and gas exploitation, more specifically, to a low-permeability reservoir CO 2 Calculation method of miscible flooding limit well spacing. Background technique [0002] CO 2 Oil flooding technology is the CO 2 A technology that is injected into an oil reservoir to enhance oil recovery from an oilfield. CO 2 The oil displacement mechanism mainly includes: (1) CO 2 It has good miscibility with crude oil and can significantly reduce the viscosity of crude oil; (2) CO 2 Soluble in crude oil and water, make it carbonated, improve the mobility ratio of crude oil and water; (3) CO 2 After being injected into the oil reservoir, the volume of the crude oil is greatly expanded, which can increase the elastic energy of the formation; (4) CO 2 Extraction and vaporization of light hydrocarbons in crude oil; (5) CO 2 After mixing with crude oil, it can not only extract and vaporize light hydrocarbons...
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 Patents(China)
IPC IPC(8): E21B43/16E21B43/30G06Q50/02
CPCE21B43/164E21B43/30G06Q50/02
Inventor 迟杰
Owner SHENGLI COLLEGE CHINA UNIV OF PETROLEUM