Double-stimulation expanding gel particle for preventing gas channeling in process of carbon dioxide oil displacement and preparation method of double-stimulation expanding gel particle

A technology for carbon dioxide and oil displacement process, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor solubility, insufficient tolerance, high industrial cost, and achieve the effect of simple composition and convenient operation

Active Publication Date: 2018-10-16
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with the traditional WAG process, although the chemical agent-assisted WAG has made some progress in improving the gas flow ratio, it still has the following shortcomings: (1) The concentration of small molecule surfactants to achieve effective viscosity increase is relatively high, and the industrial cost is low. High; (2) For polymer tackifiers with a molecular weight over one million, CO 2 The ability to dissolve such molecules is poor, and it is difficult to achieve effective viscosity increase
Alth

Method used

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  • Double-stimulation expanding gel particle for preventing gas channeling in process of carbon dioxide oil displacement and preparation method of double-stimulation expanding gel particle
  • Double-stimulation expanding gel particle for preventing gas channeling in process of carbon dioxide oil displacement and preparation method of double-stimulation expanding gel particle
  • Double-stimulation expanding gel particle for preventing gas channeling in process of carbon dioxide oil displacement and preparation method of double-stimulation expanding gel particle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]

[0035] Dissolve 56.80g of AM monomer in 180.00g of pure water, add 0.04g of cross-linking agent MBA, 3.60g of SBMA, and 2.08g of DMAEMA to the solution in sequence, and stir until it becomes clear to obtain a mixed monomer solution polymerization system. Nitrogen was passed through the system to remove oxygen for 30 minutes; 0.12g of potassium persulfate was weighed and dissolved in 6.00g of water to prepare an initiator solution; the mixed monomer solution and the initiator solution were mixed, and the mixed reaction solution was reacted in a water bath at 40°C After 10.0 hours, continue to heat up to 60°C for 8.0 hours to increase the conversion rate. After the reaction is completed, a copolymerized gel is obtained, and the dried product is pulverized with a 12000r / min universal pulverizer. The crushing operation is as follows: after crushing for 2 seconds, stand still for 8 seconds, repeat this cycle operation ten times, and use fans to dissipate heat. The obta...

Embodiment 2

[0037]

[0038] Dissolve 56.80g of AM monomer in 180.00g of pure water, add 0.04g of cross-linking agent MBA, 3.60g of SBMA, and 4.16g of DMAEMA to the solution in sequence, and stir until it becomes clear to obtain a mixed monomer solution polymerization system. Nitrogen was passed through the system to remove oxygen for 30 minutes; 0.12g of potassium persulfate was weighed and dissolved in 6.00g of water to prepare an initiator solution; the mixed monomer solution and the initiator solution were mixed, and the mixed reaction solution was reacted in a water bath at 40°C After 10.0 hours, continue to heat up to 60°C for 8.0 hours to increase the conversion rate. After the reaction is completed, a copolymerized gel is obtained, and the dried product is pulverized with a 12000r / min universal pulverizer. The crushing operation is as follows: after crushing for 2 seconds, stand still for 8 seconds, repeat this cycle operation ten times, and use fans to dissipate heat. The obta...

Embodiment 3

[0040]

[0041]

[0042] Dissolve 56.80g of AM monomer in 180.00g of pure water, add 0.02g of cross-linking agent MBA, 3.60g of SBMA, 4.16g of DMAEMA to the solution in turn, stir until clarified to obtain a mixed monomer solution polymerization system, and add to the polymerization system while stirring evenly Nitrogen was passed through the system to remove oxygen for 30 minutes; 0.12g of potassium persulfate was weighed and dissolved in 6.00g of water to prepare an initiator solution; the mixed monomer solution and the initiator solution were mixed, and the mixed reaction solution was reacted in a water bath at 40°C After 10.0 hours, continue to heat up to 60°C for 8.0 hours to increase the conversion rate. After the reaction is completed, a copolymerized gel is obtained, and the dried product is pulverized with a 12000r / min universal pulverizer. The crushing operation is as follows: after crushing for 2 seconds, stand still for 8 seconds, repeat this cycle operation ...

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Abstract

The invention discloses a preparation method of a double-stimulation expanding gel particle for preventing gas channeling in the process of carbon dioxide oil displacement. The method includes: 1), dissolving an acrylamide monomer into water to form a solution, adding a crosslinking agent, a temperature response monomer methacrylic acid N, an N-dimethylaminoethyl ester monomer and carbon dioxide response monomer (2-(methacrylenyl oxide) ethyl) dimethyl-(3-sulfonic acid propyl) ammonium hydroxide to the solution with even stirring to form a mixed monomer solution polymerization system, and feeding nitrogen to the polymerization system to remove dissolved oxygen in the system; 2), mixing the mixed monomer with an initiator solution for polymerization reaction. The gel particle continuous expands under CO2 and thermal stimulation, secondary expansion of the gel particle under the acidic environment is achieved, and long-time blocking function can be played.

Description

technical field [0001] The invention belongs to the field of oil and gas exploitation, and in particular relates to an expanded microsphere used for preventing gas channeling in the carbon dioxide oil extraction process and a preparation method thereof. Background technique [0002] Petroleum is the most important strategic material in the world and one of the most important energy and chemical raw materials in the industrial field. In the current oil recovery process, due to structural reasons such as high viscosity and low hydrophilicity of crude oil itself, more than 50% of the crude oil has not been effectively recovered after "secondary oil recovery". Gas injection, especially CO injection 2 Enhanced oil recovery is one of the key technologies for tertiary oil recovery. CO 2 The oil recovery is enhanced through the mechanisms of interphase mass transfer, volume expansion, oil-gas miscibility, viscosity reduction, and oil-gas interfacial tension reduction during the c...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F220/38C08F222/38C09K8/594
CPCC08F220/56C09K8/594C08F220/34C08F220/387C08F222/385
Inventor 冯玉军田啟锐
Owner SICHUAN UNIV
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