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Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir and profile control agent as well as preparation method and application thereof

A technology of carbon dioxide and gel particles, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of limited plugging effect, development of micro-cracks, easy channeling, etc., and reach the effective period Long, good temperature resistance, salt resistance and acid resistance, and the effect of overcoming particle flocculation and sedimentation

Active Publication Date: 2020-06-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of gel particles is simple, and the stability is good during use, which avoids the disadvantages of poor underground gelation effect and limited plugging effect of traditional gel plugging agents
[0004] CO 2 Flooding has great potential and strong adaptability in low-permeability reservoirs, but in low-permeability reservoirs, micro-fractures are developed and heterogeneity is strong, and channeling is prone to occur

Method used

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  • Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir and profile control agent as well as preparation method and application thereof
  • Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir and profile control agent as well as preparation method and application thereof
  • Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir and profile control agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0056] 1. A CO2 suitable for low-permeability fractures 2 The preparation method of the gel particle of oil flooding reservoir, comprises the steps:

[0057] (1) Raw materials: 6g of acrylamide; 11.3332g of acid-resistant functional monomer; 0.87g of temperature-resistant functional monomer; 1.178g of salt-resistant functional monomer; 4g of initiator; 0.52g of crosslinking agent; .

[0058] Wherein: the acid-resistant functional monomer is selected from dimethyl diallyl ammonium chloride; the temperature-resistant functional monomer is selected from 4-styrenesulfonic acid sodium salt; the salt-resistant functional monomer is selected from [2-(methacryloyloxy base) ethyl] dimethyl-(3-sulfonic acid propyl) ammonium hydroxide; the initiator is ammonium persulfate with a mass concentration of 15%; the cross-linking agent is N,N-methylenebisacrylamide; The agent used polyethylene glycol-200.

[0059] (2) Weigh acrylamide, dimethyl diallyl ammonium chloride, sodium 4-styrenesulf...

no. 2 example

[0063] 1. A CO2 suitable for low-permeability fractures 2 The preparation method of the gel particle of oil flooding reservoir, comprises the steps:

[0064] (1) Raw materials: acrylamide 5.002g; acid-resistant functional monomer 14.999g; temperature-resistant functional monomer 0.501g; salt-resistant functional monomer 1.498g; initiator 1.001g; cross-linking agent 0.500g; Ionized water 25.998g.

[0065] Wherein: the acid-resistant functional monomer is selected diallyl quaternary ammonium salt; the temperature-resistant functional monomer is selected N-alkylmaleimide; the salt-resistant functional monomer is selected methacrylamide; the initiator is selected with a mass concentration of 15% ammonium persulfate solution; the cross-linking agent is dimethylaminoethyl methacrylate; the strengthening agent is polyethylene glycol-200.

[0066] (2) Weigh acrylamide, diallyl quaternary ammonium salt, N-alkylmaleimide, and methacrylamide respectively according to the above contents...

no. 3 example

[0070] 1. A CO2 suitable for low-permeability fractures 2 The preparation method of the gel particle of oil flooding reservoir, comprises the steps:

[0071] (1) Raw materials: 10.001g of acrylamide; 5.000g of acid-resistant functional monomer; 1.499g of temperature-resistant functional monomer; 0.500g of salt-resistant functional monomer; 0.501g of initiator; 5.002g of crosslinking agent; 22.601 g.

[0072] Wherein: the acid-resistant functional monomer is selected from dimethylaminopropyl methacrylamide; the temperature-resistant functional monomer is selected from 2-acrylamide-2-methylpropanesulfonic acid; the salt-resistant functional monomer is selected from N-vinyl-2 -pyrrolidone; 15wt.% potassium persulfate solution is selected as the initiator; N,N-methylenebisacrylamide is selected as the cross-linking agent; polyethylene glycol-200 is selected as the reinforcing agent.

[0073] (2) Weigh acrylamide, dimethylaminopropyl methacrylamide, 2-acrylamide-2-methylpropanesu...

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Abstract

The invention relates to the technical field of oil field profile control and water plugging agents, in particular to gel particles suitable for a low-permeability fractured carbon dioxide flooding oil reservoir, a profile control agent, a preparation method and an application thereof. The gel particle is prepared from the following components in percentage by mass: 10 to 20 percent of an acrylamide monomer; 10-30% of an acid-resistant functional monomer; 1-3.0% of a temperature-resistant functional monomer; 1-3.0% of a salt-tolerant functional monomer; 1-2.0% of a cross-linking agent; 1-10% of an initiator; 0.2 to 1.0 percent of a reinforcing agent; and the balance of aqueous phase. By compounding the gel particles with a cationic polymer solution, the acid-resistant gel particle profilecontrol agent is obtained. The acid-resistant gel particle profile control system prepared by the method is good in temperature resistance, salt resistance and acid resistance and long in action validity period, can be used as an excellent low-permeability fractured CO2 flooding oil reservoir profile control system and is used for blocking a heterogeneous stratum with micro-fracture development.

Description

technical field [0001] The invention relates to the technical field of oilfield profile control and water shutoff agents, in particular to a CO 2 Gel particles and profile control agents for oil flooding reservoirs, their preparation methods and applications. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In recent years, with the continuous deepening of oilfield development, the heterogeneity of the reservoir is stronger, the remaining oil is widely distributed, the phenomenon of water flooding and water channeling is serious, and the injection fluid is inefficient circulation, and the conventional polymer gel profile control method is difficult to realize. Effective b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/516C09K8/594E21B43/16
CPCC09K8/5083C09K8/512C09K8/516C09K8/594E21B43/164
Inventor 杨红斌康万利周博博谢安清康鑫蒋海壮范海明张亮袁泽雯
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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