Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Chemical flooding injection method for improving recovery rate of crude oil

A chemical flooding and recovery technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of alkali agent consumption increasing the cost of oil extraction, restricting the promotion and application of industrialization, and damage to formations and oil wells. Achieve the effect of enhancing oil recovery, increasing swept volume, and avoiding damage

Inactive Publication Date: 2012-04-18
孙安顺
View PDF4 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after polymer flooding, there is still a large amount of crude oil remaining in the formation, especially in the middle and low permeability layers, and some replacement technologies adopted after polymer flooding, such as: ASP flooding as a replacement technology after polymer flooding in Daqing Oilfield Field tests and applications have been carried out, and the results show that ASP flooding can increase the recovery rate by 10% on the basis of polymer flooding. Consumption also increases the cost of oil extraction, which restricts its further industrial application; binary compound flooding technology is used after polymer flooding, and the recovery factor is further enhanced by the principle of ultra-low interfacial tension. The effect of recovery rate is not ideal

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
  • Chemical flooding injection method for improving recovery rate of crude oil
  • Chemical flooding injection method for improving recovery rate of crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The present invention is further described below in conjunction with specific embodiment:

[0008] Chemical flooding injection method for enhanced oil recovery: ① After polymer flooding, inject 0.3PV emulsifier slug with concentration of 1700mg / L; ②Reinject polymer with molecular weight of 25 million and concentration of 1500mg / L, concentration % (wt) surfactant binary compound slug 0.4PV. The emulsifier slug is composed of: functional polymer 1000mg / L, T-60 500mg / L, sodium tripolyphosphate 200mg / L, and water as the balance.

[0009] Chemical flooding injection method 2 for enhanced oil recovery: ① After polymer flooding, inject emulsifier slug 0.2PV with a concentration of 2250mg / L; % (wt) surfactant binary compound slug 0.4PV. The emulsifier slug is composed of: functional polymer 1500mg / L, OP-2 500mg / L, citric acid 250mg / L, and water as the balance.

[0010] Chemical flooding injection method three for enhanced oil recovery: ① inject 0.25PV emulsifier slug wit...

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

PropertyMeasurementUnit
Concentrationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a chemical flooding injection method for improving recovery rate of crude oil. The method comprises the following steps of: (1) injecting 0.1 to 0.5 physical volume (PV) of 1,000 to 2,500 mg / L emulsifier plug after polymer flooding; and (2) injecting 0.2 to 0.5 PV of binary composite plug of 500 to 2,500 mg / L polymer with the molecular weight of 20 to 30 million and 0.1 to 0.3 weight percent surfactant. According to the chemical flooding injection method, the residual oil obtained after the polymer flooding is emulsified by injecting the emulsifier plug to form oil-in-water emulsion, and the oil-in-water emulsion is displaced by using binary composite flooding, so that the recovery rate of the crude oil is improved by over 20 percent.

Description

technical field [0001] The invention relates to an injection method of the chemical flooding part of enhanced crude oil recovery. Background technique [0002] In recent years, technologies such as polymer flooding, surfactant flooding and composite flooding have made remarkable achievements, and the technical level is becoming more and more mature. Polymer flooding technology, with its unique oil displacement mechanism that mainly focuses on improving the sweep efficiency and supplemented by improving the oil washing efficiency, can increase the recovery rate by more than 10% on the basis of water flooding. However, after polymer flooding, there is still a large amount of crude oil remaining in the formation, especially in the middle and low permeability layers, and some replacement technologies adopted after polymer flooding, such as: ASP flooding as a replacement technology after polymer flooding in Daqing Oilfield Field tests and applications have been carried out, and ...

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
IPC IPC(8): E21B43/22
Inventor 孙安顺
Owner 孙安顺
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com