Metho for evaluating dynamic stability of foam in rock core oil-displacing process

A technology of dynamic stability and oil displacement process, which is used in material analysis, measuring devices, instruments, etc. through resonance, and can solve the problems of inability to evaluate foam dynamic stability.

Active Publication Date: 2018-09-18
SHANGHAI UNIV
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects existing in the prior art, the present invention provides a method for evaluating the dynamic stability of the foam in the core during oil displacement based on the nuclear magnetic resonance technology and the principle of mass conservation, and solves the problem that the dynamic stability of the foam in the core cannot be evaluated for a long time The problem

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Metho for evaluating dynamic stability of foam in rock core oil-displacing process
  • Metho for evaluating dynamic stability of foam in rock core oil-displacing process
  • Metho for evaluating dynamic stability of foam in rock core oil-displacing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] Now the specific embodiment of the present invention in conjunction with accompanying drawing is described in the following.

[0048] Firstly, the foam system was evaluated by static evaluation method (stirring method), and the results are shown in Table 1. The static experiments of the two foam systems show that the foaming volumes of the two foam systems are not much different, but the stability is quite different. Foam System 2 has a 70% higher half-life than Foam System 1.

[0049] Table 1 Static evaluation results of foam system performance

[0050] sample

Bubble volume / mL

Half-life / min

foam system 1

230

340

Foam System 2

210

590

[0051] A method for evaluating the dynamic stability of foam in the oil displacement process of the present embodiment, the specific steps are as follows:

[0052] a. Core flooding nuclear magnetic resonance experiment

[0053] The experimental parameters of the core flooding NMR experi...

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

No PUM Login to view more

Abstract

The invention relates to a method for evaluating the dynamic stability of foam in a rock core oil-displacing process, and belongs to the technical field of improvement of oil recovery through foam flooding. In the prior art, foam flooding can significantly improve crude oil recovery, and the stability of foam is a key factor affecting the wide use of the foam flooding technology; the current method for evaluating the stability of foam is mainly a static evaluation method; and in the actual oil displacing process, the foam is subjected to the dynamic process comprising continuous defoaming andcontinuous foam generating, such that the stability of the foam during the oil displacing cannot be truly reflected by using the static evaluation method. According to the present invention, based onthe nuclear magnetic resonance technology and the mass conservation principle, the gas-liquid mass ratio relationship between the inlet end and the outlet end of the rock core is established, and thedynamic instability factor of the foam is defined, wherein the dynamic instability factor of the foam can evaluate the dynamic stability of the foam during the oil displacing of the rock core, and theproblem that the dynamic stability of the foam cannot be evaluated during the oil displacing of the rock core for a long time can be solved.

Description

technical field [0001] The invention relates to a method for evaluating the dynamic stability of foam in the process of core flooding, and belongs to the technical field of foam flooding enhanced oil recovery. Background technique [0002] Foam flooding can significantly improve oil recovery, and the stability of foam is a key factor affecting the wide application of foam flooding technology. At present, the evaluation methods of foam stability mainly include: [0003] (1) Improved Ross-Miles method: The improved Ross-Miles method is a national standard method (GB / T7462-94) for foam performance testing. This method is to configure a certain concentration of sample solution at a certain temperature, and 200mL of Flow down from a pore with a height of 900mm and an inner diameter of 2.9mm, and pour it into a 50mL sample solution with the same temperature and concentration, and record the foam height when the 200mL solution has been flowed out as the foaming force evaluation in...

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
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/08
CPCG01N24/081
Inventor 王文昌狄勤丰张景楠华帅陈锋叶峰李原
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap