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

A polyacrylamide microsphere, a nanoemulsion for regulating and flooding low-permeability reservoirs, its preparation method and application

A nano-emulsion and acrylamide technology, applied in the field of polymer emulsion, can solve the problems of inability to plug the pores of the target formation, large cross-linked polymer particle size, and low degree of recovery, so as to increase the swept volume of injected water, Small particle size and good fluidity

Active Publication Date: 2022-05-24
DESHI ENERGY TECH GRP CO LTD +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the particle size of the cross-linked polymer is too small, even after swelling, a lot of products will still be lost, resulting in waste. If the particle size of the cross-linked polymer is too large, it is not easy to inject the product. Part of the target formation pores
These profile control methods mainly improve the seepage conditions near the water injection wells, and increase the swept volume near the water injection wells. However, the remaining oil saturation near the water injection wells is small, so the recovery factor is not greatly improved.

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 polyacrylamide microsphere, a nanoemulsion for regulating and flooding low-permeability reservoirs, its preparation method and application
  • A polyacrylamide microsphere, a nanoemulsion for regulating and flooding low-permeability reservoirs, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Nanoemulsion 1#

[0039] Nanoemulsion 1# contains the following raw material components by mass: 20 parts of acrylamide monomer, 2 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.1 part of N,N-methylenebisacrylamide, water loss 23 parts of sorbitan fatty acid ester S-60, 12 parts of polyoxyethylene sorbitan fatty acid ester T-80, 3 parts of nonylphenol polyoxyethylene ether Tx-10, 5 parts of sodium alkyl benzene sulfonate, initiator 0.765 parts of ethylenediaminetetraacetic acid tetrasodium, 80 parts of white oil and 25 parts of deionized water, wherein the initiator is composed of azobisisobutyronitrile, sodium bisulfite and potassium persulfate, azobisisobutyronitrile The mass ratio of nitrile, sodium bisulfite and potassium persulfate was 4.5:3.5:2.

[0040] The preparation method of nanoemulsion 1# comprises the following steps:

[0041] (1) Preparation of aqueous solution

[0042] Add 250Kg of deionized water to the clean stainless steel reactor,...

Embodiment 2

[0050] Example 2 Nanoemulsion 2#

[0051] The preparation process of nanoemulsion 2# is the same as that of Example 1, except that in step (1), 250Kg of deionized water is added to the clean stainless steel reaction kettle, the stirring is started, the stirring speed is controlled to 75r / min, 250Kg of acrylamide monomer is added, and the stirring is carried out. 10min, add 20Kg 2-acrylamide-2-methylpropanesulfonic acid, stir for 5min, add KOH to adjust pH to neutral, add 3Kg N,N-methylenebisacrylamide, stir for 5min, then add 1Kg ethylenediaminetetramine Tetrasodium acetate was stirred for 10min to obtain an aqueous solution.

Embodiment 3

[0052] Example 3 Nanoemulsion 3#

[0053] The preparation process of nanoemulsion 3# is the same as that of Example 1, except that in step (1), 250Kg of deionized water is added to the clean stainless steel reaction kettle, the stirring is started, the stirring speed is controlled to 75r / min, 150Kg of acrylamide monomer is added, and the stirring is carried out. 10min, add 10Kg 2-acrylamide-2-methylpropanesulfonic acid, stir for 5min, add KOH to adjust pH to neutrality, add 2Kg N,N-methylenebisacrylamide, stir for 5min, then add 5Kg ethylenediaminetetramine Tetrasodium acetate was stirred for 10min to obtain an aqueous solution.

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
particle diameteraaaaaaaaaa
viscosityaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a polyacrylamide microsphere, a nanoemulsion for regulating and flooding low-permeability oil reservoirs, a preparation method and application thereof. The microspheres are copolymers of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and N,N-methylenebisacrylamide, and the average particle diameter of the microspheres is 40-120nm. The emulsion comprises 15-30 parts of the polyacrylamide microspheres and 60-90 parts of white oil. The polyacrylamide microspheres are nano-scale microspheres, which have good expansion performance and can be used for regulating and flooding low-permeability reservoirs. The emulsion uses white oil as the oil phase, adding tetrasodium edetate as a dispersant, which improves the dispersion uniformity of the polyacrylamide emulsion, and the obtained nanoemulsion has a small particle size, good fluidity, and good swelling It can continuously migrate and plug through the pores of low-permeability reservoirs, thereby increasing the swept volume of injected water and improving the recovery factor of low-permeability reservoirs.

Description

technical field [0001] The invention relates to a nano-emulsion for regulating and flooding of low-permeability oil reservoirs, a preparation method and application thereof, and belongs to the technical field of polymer emulsions. Background technique [0002] In recent years, with the rapid development of various oil fields, the proportion of low-permeability resources in the newly added proven reserves has been increasing. With the continuous development of low-permeability oil fields, the porosity and permeability of old oil wells are further deteriorated, the water content is higher, the formation heterogeneity is higher, and the contradiction is more prominent. In the process of development, artificial fractures are created by fracturing, repeated fracturing and other measures, coupled with the natural fractures in the formation itself, it becomes more and more difficult to exploit low-permeability oil. [0003] Profile control is one of the most widely used methods to...

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): C08F220/56C08F220/58C08F222/38C08F2/30C08F2/26C09K8/588
CPCC08F220/56C08F2/30C08F2/26C09K8/588C08F220/585C08F222/385
Inventor 崔仕章刘小芳宋新旺郑志微侯云福郭鑫
Owner DESHI ENERGY TECH GRP CO LTD
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