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Polyacrylamide microsphere, nano-emulsion for profile control and flooding of low-permeability oil reservoir as well as preparation method and application of nano-emulsion

A technology of polyacrylamide and nanoemulsion, which is applied in the field of polymer emulsion, can solve the problems that the pores of the target formation cannot be blocked, the particle size of the cross-linked polymer is large, and the degree of recovery is not large, so as to achieve good expansion performance, particle size The diameter is small, and the effect of increasing the swept volume

Active Publication Date: 2020-12-25
DESHI ENERGY TECH GRP CO LTD +1
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  • 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

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  • Polyacrylamide microsphere, nano-emulsion for profile control and flooding of low-permeability oil reservoir as well as preparation method and application of nano-emulsion
  • Polyacrylamide microsphere, nano-emulsion for profile control and flooding of low-permeability oil reservoir as well as preparation method and application of nano-emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 Nanoemulsion 1#

[0039] Nanoemulsion 1# contains the following raw material components in parts by mass: 20 parts of acrylamide monomer, 2 parts of 2-acrylamide-2-methylpropanesulfonic acid, 0.1 part of N,N-methylenebisacrylamide, dehydration 23 parts of sorbitol 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 alkylbenzene sulfonate, initiator 0.765 parts of agent, 0.5 parts of tetrasodium edetate, 80 parts of white oil and 25 parts of deionized water, wherein the initiator is composed of azobisisobutyronitrile, sodium bisulfite and potassium persulfate, and azobisisobutyronitrile The mass ratio of butyronitrile, sodium bisulfite and potassium persulfate is 4.5:3.5:2.

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

[0041] (1) Preparation of aqueous phase solution

[0042] Add 250Kg of deionized water into a clean s...

Embodiment 2

[0050] Embodiment 2 Nanoemulsion 2#

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

Embodiment 3

[0052] Embodiment 3 Nanoemulsion 3#

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

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Abstract

The invention provides polyacrylamide microspheres, a nano-emulsion for profile control and flooding of a low-permeability oil reservoir as well as a preparation method and an application of the nano-emulsion. The microspheres are copolymers of acrylamide, 2-acrylamide-2-methyl propanesulfonic acid and N, N-methylene bisacrylamide, and the average particle size of the microspheres is 40-120 nm. The emulsion is prepared from the following components in parts by weight: 15-30 parts of polyacrylamide microspheres and 60 to 90 parts of white oil. The polyacrylamide microsphere is a nanoscale microsphere, has good expansion performance and can be applied to profile control and flooding of low-permeability oil reservoirs. According to the emulsion, the white oil is used as an oil phase, and ethylenediamine tetraacetic acid tetrasodium is added as a dispersing agent, so that the dispersion uniformity of the polyacrylamide emulsion is improved, and the obtained nano-emulsion is relatively small in particle size, good in flowability and good in expansibility, and can be continuously moved and blocked in pores of a low-permeability oil reservoir, so that the swept volume of injected water can be increased; and the recovery ratio of the low-permeability oil reservoir is improved.

Description

technical field [0001] The invention relates to a nanoemulsion for controlling and flooding 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 oilfields, the proportion of low-permeability resources in newly-added proven reserves has been increasing. With the continuous development of low-permeability oilfields, the porosity and permeability of old oil well reservoirs further deteriorate, the water content is higher, the formation heterogeneity is higher, and the contradictions are more prominent. During the development process, measures such as fracturing and repeated fracturing create artificial fractures, coupled with the natural fractures in the formation itself, it is becoming more and more difficult to exploit low-permeability oil. [0003] Profile control is a widely used method to enhance oil recove...

Claims

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Application Information

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Patent Type & Authority Applications(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
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