A method for determining the degree of gas channeling during nitrogen foam flooding

A nitrogen foam, oil displacement process technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as the timing and intensity of gas channeling that are not quantified

Active Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the methods given in the above literature can only qualitatively judge gas channeling, and there is no way to quantify the timing and intensity of gas channeling based on experimental data
At present, domestic and foreign 2 There are few studies on the phenomenon of gas channeling during foam flooding, and the existing studies mainly focus on N 2 Foam flooding mechanism, and feasibility analysis, etc., lack of N 2 Quantitative judgment of gas channeling timing and definition of gas channeling degree during foam flooding

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
  • A method for determining the degree of gas channeling during nitrogen foam flooding
  • A method for determining the degree of gas channeling during nitrogen foam flooding
  • A method for determining the degree of gas channeling during nitrogen foam flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The technical scheme of the present invention is as follows:

[0015] A method for determining the degree of gas channeling during nitrogen foam flooding, including the following steps:

[0016] (1) Inject nitrogen foam fluid into the injection well and measure the gas production V of the production well at different times g And liquid production volume V l ;

[0017] (2) Calculate the gas production rate f of producing wells at different times according to formula (I) g ,

[0018]

[0019] (3) f calculated at different times g , Draw a curve, calculate the gas production rate rise index I of the production well according to formula (II) g ,

[0020]

[0021] In formula (II), t 1 , T 2 Respectively indicate the start and end time of production; V g1 , V g2 Respectively indicate the gas production at the beginning and end of production; V l1 , V l2 Indicate the liquid production volume at the beginning and end of production respectively;

[0022] (4) Determine the degree of gas cha...

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 present invention relates to a method for determining the degree of gas channeling during nitrogen foam flooding, comprising the following steps: (1) injecting nitrogen foam fluid into an injection well, and measuring the gas production Vg and liquid production Vl of production wells at different times; 2) calculate the gas production rate fg of the production well at different times; (3) draw a curve according to the fg calculated at different times, and calculate the gas production rate increase index Ig of the production well; (4) determine the gas channeling in the foam flooding process degree. Utilizing the method for determining the degree of gas channeling in the process of nitrogen foam flooding provided by the present invention, it is possible to qualitatively and quantitatively determine the degree of gas penetration in the production well of the oil field, whether there is gas channeling, the degree of gas channeling, and when to start sealing channeling measure.

Description

Technical field [0001] The invention relates to a method for determining the degree of gas channeling in a nitrogen foam flooding process, and belongs to the technical field of oil and gas field development. Background technique [0002] Foam flooding is a tertiary oil recovery method that uses foam fluid as the displacement medium. Foam fluid has the advantages of high apparent viscosity, selectivity to permeability and oil-water layer, and strong oil washing and plugging profile control. Oil flooding has become an efficient method of enhancing oil recovery, and good application results have been achieved in field experiments in some oil fields. Compared with other gases, N 2 Wide sources, economical and reasonable preparation process, and N 2 It is not easy to scale, corrode pipelines and many other advantages, so N 2 Foam flooding has been favored by major oil fields. [0003] After the foam is injected into the formation, the stable foam will effectively plug the high permeabi...

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 Patents(China)
IPC IPC(8): E21B43/22
Inventor 李兆敏鹿腾张习斌李松岩王弘宇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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