Gel plugging agent and preparation method thereof

A technology of plugging agent and gel, which is applied in the field of gel plugging agent and its preparation, can solve the problem that the gel plugging material cannot be further reacted and solidified, achieve good water absorption and expansion ability, improve burst resistance, and reduce repeated missing effects

Inactive Publication Date: 2017-01-11
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a gel plugging agent, which can solve the problem that the existing gel plugging material enters the leakage layer and cannot be further reacted and solidified

Method used

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  • Gel plugging agent and preparation method thereof
  • Gel plugging agent and preparation method thereof
  • Gel plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Gel plugging agent, the preparation method is as follows:

[0034] (1) Weigh 50g of formaldehyde, pour it into a four-neck flask, adjust the pH value to 8.5 with triethanolamine, then add 22g of melamine, and heat it in a water bath at 65°C for 10min, the melamine dissolves and forms a transparent solution. Rapidly raise the temperature to 74°C, heat up to 85°C after the hydroxymethylation reaction for 70 minutes, adjust the pH value to 7.0 with oxalic acid solution, and react for 30 minutes to obtain the reactive material A 1 .

[0035] (2) Mix 8g of AA (acrylic acid) and 60g of reactive material A 1 Add 60g of clear water, stir well and adjust the pH to 7 with aqueous sodium hydroxide solution; then add 0.04g of cross-linking agent N, N-methylenebisacrylamide and 32g of AM (acrylamide), stir and dissolve, and then add When the temperature is raised to 40°C, add 0.2g potassium persulfate and 0.2g sodium sulfite, and let it stand to react into a gel; take out the prod...

Embodiment 2

[0040] Gel plugging agent, the preparation method is as follows:

[0041] (1) Weigh 66g of formaldehyde, pour it into a four-neck flask, adjust the pH value to 8.5 with triethanolamine, then add 22g of melamine, and heat it in a water bath at 60°C for 15min, the melamine dissolves and forms a transparent solution. Rapidly raise the temperature to 80°C, heat up to 90°C after the hydroxymethylation reaction for 90 minutes, adjust the pH value to 7.5 with oxalic acid solution, and react for 1 hour to obtain the reactive material A 2 .

[0042] (2) Mix 10g AA and 70g reactable material A 2 Add 60g of clear water, stir evenly and adjust the pH to 7 with aqueous sodium hydroxide solution; then add 30g of N,N-dimethylacrylamide and 0.04g of N,N-methylenebisacrylamide, stir and dissolve, and place in a water bath When the temperature is raised to 40°C under the conditions, add 0.2g potassium persulfate and 0.2g sodium sulfite, and let it stand still to react into a gel; take out the...

Embodiment 3

[0047] Gel plugging agent, the preparation method is as follows:

[0048] (1) Weigh 60g of formaldehyde, pour it into a four-neck flask, adjust the pH value to 8.0 with triethanolamine, then add 22g of melamine, and heat it in a water bath at 60°C for 10min, the melamine dissolves and forms a transparent solution. Rapidly raise the temperature to 70°C, hydroxymethylation reaction for 60min, then raise the temperature to 80°C, adjust the pH value to 7.5 with oxalic acid solution, and react for 2h to obtain the reactive material A 3 .

[0049] (2) Combine 18g AA and 70gA 3 Add 120g of clear water, stir well and adjust the pH to 7 with aqueous sodium hydroxide solution; then add 0.04g of N,N-methylenebisacrylamide, 14g of AM (acrylamide) and 8g of N,N-diethylacrylamide, and stir After dissolving, when the temperature is raised to 40°C in a water bath, 0.2g potassium persulfate and 0.2g sodium sulfite are added, and the reaction becomes gel after standing; the product is taken out...

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Abstract

Belonging to the technical field of oilfield chemistry petroleum drilling plugging agents, the invention in particular relates to a gel plugging agent and a preparation method thereof. The preparation method consists of: carrying out hydroxymethylation reaction on formaldehyde and melamine in an alkaline environment to obtain a reactive material A; and carrying out reaction on the reactive material A, an acrylic monomer B, an acrylamide monomer C and a crosslinking agent N, N-methylene bisacrylamide under the action of an initiator D so as to obtain the gel plugging agent. The reactive gel plugging agent can react and solidify in a leakage channel, and is conducive to enhancing the breakage resistance of the plugging layer and reducing repeated leakage.

Description

technical field [0001] The invention belongs to the technical field of oil field chemical oil drilling plugging agent, in particular to a gel plugging agent and a preparation method thereof. Background technique [0002] With the deepening of oil and gas exploration and development, the formations encountered in the drilling process are becoming more and more complex. When drilling into broken or weakly cemented formations, fractured formations and multiple sets of pressure formations, lost circulation is very easy to occur. [0003] Water-absorbing resin (Super Absorbent Polymer, SAP) has a high water absorption function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized . Due to the water-absorbing expansion and deformation ability, the success rate of plugging can be greatly improved, and it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C08F283/00C08F220/56C08F220/06
CPCC08F283/00C09K8/426C08F220/56
Inventor 周亚贤刘文堂耿晓慧姜雪清谢建宇郭建华孙举王中华
Owner 中石化石油工程技术服务有限公司
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