Polyacrylamide-based microsphere deep control agent and its preparation method and application

A technology of polyacrylamide and flooding agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of large initial particle size, high risk, poor oil displacement effect, etc.

Active Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that the dispersion polymerization method used to prepare the core-shell polymer microsphere emulsion contains low-boiling point organic solvents, which is dangerous and has a large initial particle size and poor stability. The inverse emulsion method is used to obtain It is only a spherical product. Polymer microspheres are used in medium and high permeability reservoirs for profile control, plugging and oil displacement. Spherical deep control and displacement agent, especially suitable for medium and high permeability reservoirs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]Add 680g of white oil, 60g of SPAN80, 30g of oligoethylene oxide methacrylate polymer emulsifier, 7g of AEO9 into a 3L large beaker, and stir until completely mixed as an oil phase; add 360g of water into another container , 450g of acrylamide, 150g of dimethyl diallyl ammonium chloride, 0.3g of disodium edetate, 9g of isopropanol, 8g of urea, 1.5g of methylenebisacrylamide, stir to dissolve evenly, and adjust the pH Value = 8 as the nuclear water phase I; take a container and add 260g of water, 350g of acrylamide, 15g of acrylic acid, 0.2g of disodium edetate, 7g of isopropanol, 4g of urea, and 0.5g of methylenebisacrylamide, Stir to dissolve evenly, adjust pH=7 as shell water phase II; in addition, prepare 2% ammonium persulfate and 0.05% and 0.5% sodium bisulfite aqueous solutions respectively for later use. Turn on the emulsifier at 10,000 rpm, add all the nuclear water phase I into the large beaker storing the oil phase, shear and stir for 30 minutes until the emuls...

Embodiment 2

[0055] Add 650g solvent oil, 45g SPAN85, 30g polyisobutylene succinic anhydride ester polymer emulsifier, 7g AEO15 into a 3L large beaker, stir until completely mixed evenly as the oil phase; add 380g water, 430g acrylamide in another container , 150g of acryloyloxyethyltrimethylammonium chloride, 0.3g of disodium edetate, 10g of isopropanol, 7g of urea, 1.1g of methylenebisacrylamide, stir and dissolve evenly, and adjust the pH value to 8 As the nuclear water phase I; take a container and add 252g of water, 320g of acrylamide, 18g of 2-acrylamido-2-methylpropanesulfonic acid, 12g of styrene, 0.2g of disodium edetate, and 8g of isopropanol , urea 4g, methylenebisacrylamide 0.2g, divinylbenzene 1.1g, stir and dissolve evenly, adjust pH=8.5 as shell water phase II; in addition, prepare 2% ammonium persulfate and 0.04% sulfurous acid respectively Sodium hydrogen aqueous solution and 0.5% AIBA aqueous solution are used for later use. Turn on the emulsifier at 10,000 rpm, add all ...

Embodiment 3

[0058] Add 680g cyclohexane, 38g SPAN60, 32g styrene-maleic anhydride copolymer polymer emulsifier, 5g AEO9 in a 3L large beaker, stir until completely mixed as oil phase; add 400g water, 460g acrylamide, 160g methacryloyloxyethyltrimethylammonium chloride, 0.6g disodium edetate, 12g isopropanol, 7g urea, 3.1g methylenebisacrylamide, stir and dissolve evenly, Adjust the pH value to 7.5 as the nuclear water phase I; then take the container and add 246g of water, 330g of acrylamide, 10g of tert-butylacrylamide, 0.35g of disodium edetate, 4.2g of isopropanol, 4.2g of urea, and 0.52g of methyl bisacrylamide, 1.6g of polyethylene glycol diacrylate, stir and dissolve evenly, adjust pH=8.2 as shell water phase II; in addition, prepare 4% ammonium persulfate and 0.1% sodium bisulfite aqueous solution respectively , 1.0% AIBN ethanol solution for standby. Turn on the emulsifier at 10,000 rpm, add all the nuclear water phase I into the large beaker storing the oil phase, shear and stir...

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PUM

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Abstract

The invention relates to a polyacrylamide-based microsphere deep control and displacement agent and a preparation method thereof, which mainly solves the problem that the use of polymer microspheres in the prior art for medium and high permeability oil reservoirs has poor profile control, plugging and oil displacement effects and cannot be achieved. Deep profile control, increasing the use concentration of polymer microspheres and increasing the cost problem, by using polyacrylamide microsphere deep control and driving agent, in parts by weight, including the following components: 0.05 to 0.5 parts of polymer Microsphere emulsion, 0.1-1 part of surfactant for oil displacement, 0-99.85 parts of water; wherein, the polymer microsphere has a core-shell structure, and the core is a cross-linked polymer gel containing ionic monomer structural units. Glue microspheres, the shell is a technical solution of cross-linked polymer gel containing ionic monomer structural units with different or the same electrical properties as the ionic monomer structural units in the core, which solves this problem well and can be used for medium and high Field application of enhanced oil recovery such as deep profile control, water shutoff, and oil displacement in seepage reservoirs.

Description

technical field [0001] The invention relates to a low-cost polyacrylamide microsphere deep control and displacement agent suitable for medium and high permeability reservoirs, a preparation method and application thereof. Background technique [0002] With the improvement of the degree of exploitation, water production from oil wells is a common problem in the current oilfield development. Especially in the old oilfields developed by long-term water injection, due to the heterogeneity of the reservoir and the difference in the viscosity of oil and water, the injected water along the water injection well The high-permeability layer or fracture between the well and the production well breaks out and fingers, resulting in premature water flooding of the production well, a decrease in oil production, and an increase in water cut. To reduce the water output of oil wells, it is usually necessary to block high-permeability layers or fractures from water injection wells, adjust the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/584C08F220/56C08F226/02C08F220/06C08F222/38C08F220/34C08F220/58C08F212/08C08F212/36C08F220/54C08F226/10C08F222/20C08F4/40C08F2/30
CPCC09K8/584C09K8/588C08F2/30C08F4/40C08F220/56C08F220/34C08F220/585C08F212/08C08F222/385C08F212/36C08F220/06C08F226/10C08F222/104C08F220/54
Inventor 夏燕敏苏智青许汇沙鸥
Owner CHINA PETROLEUM & CHEM CORP
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