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Pre-crosslinking swellable profile control agent, preparation method and application

A technology of profile control agent and body expansion type, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high expansion speed, achieve reasonable distribution, high strength, and improve the effect of water absorption profile

Inactive Publication Date: 2016-10-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel particles swell quickly after absorbing water, and the expansion ratio, strength and flexibility need to be further improved.

Method used

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  • Pre-crosslinking swellable profile control agent, preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In terms of parts by mass, the raw materials of the pre-crosslinked bulking profile control agent include: mixed monomers (acrylamide, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid in a mass ratio of 1.5:2.4:8) 20 parts, 0.01 parts of crosslinking agent (N,N'-methylene bisacrylamide), 3 parts of reinforcing agent (sodium bentonite), 0.02 parts of initiator (ammonium persulfate), a small amount of sodium hydroxide, 80 parts of water .

[0033] The preparation steps of the pre-crosslinked swelling type profile control agent are as follows:

[0034] 1) Add acrylic acid (AA) to 40 parts of water to prepare a solution with a mass concentration of 9.2%, adjust the pH of the solution to 8 with sodium hydroxide, and set aside;

[0035] The enhancer was added to 36 parts of water to prepare a slurry with a mass concentration of 7.7%, and left to stand for 24 hours to obtain a prehydrated enhancer slurry;

[0036] 2) adding acrylamide, 2-acrylamido-2-methylpropanes...

Embodiment 2

[0040] In terms of mass percentage, the raw materials of the pre-crosslinked bulking profile control agent include: mixed monomers (acrylamide, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid in a mass ratio of 2.1:2:7.5)40 0.05 parts of crosslinking agent (N,N'-methylenebisacrylamide), 5 parts of reinforcing agent (sodium bentonite), 0.01 part of initiator (potassium persulfate), a small amount of sodium hydroxide, and 160 parts of water.

[0041] The preparation steps of the pre-crosslinked swelling type profile control agent are as follows:

[0042] 1) Add acrylic acid (AA) to 100 parts of water to prepare a solution with a mass concentration of 6.45%, adjust the pH of the solution to 9 with sodium hydroxide, and set aside;

[0043]Add the enhancer to 55 parts of water, prepare a slurry with a mass concentration of 8.3%, and let it stand for 24 hours to obtain a prehydrated enhancer slurry;

[0044] 2) adding acrylamide, 2-acrylamido-2-methylpropanesulfonic acid...

Embodiment 3

[0048] In terms of mass percentage, the raw materials of the pre-crosslinked bulking profile control agent include: mixed monomers (acrylamide, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid at a mass ratio of 1.8:1.5:7.9)30 0.04 parts of crosslinking agent (N,N'-methylenebisacrylamide), 8 parts of reinforcing agent (sodium bentonite), 0.04 parts of initiator (ammonium persulfate), a small amount of sodium hydroxide, and 120 parts of water.

[0049] The preparation steps of the pre-crosslinked swelling type profile control agent are as follows:

[0050] 1) Add acrylic acid (AA) to 60 parts of water to prepare a solution with a mass concentration of 6.27%, adjust the pH of the solution to 9 with sodium hydroxide, and set aside;

[0051] Add the enhancer to 56 parts of water, prepare a slurry with a mass concentration of 12.5%, and let it stand for 24 hours to obtain a prehydrated enhancer slurry;

[0052] 2) adding acrylamide, 2-acrylamido-2-methylpropanesulfonic a...

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Abstract

The invention discloses a pre-crosslinking swellable profile control agent, a preparation method and application, and belongs to the technical field of oilfield chemistry. The pre-crosslinking swellable profile control agent is prepared from, by mass, 20-40 parts of mixed monomers, 0.01-0.05 part of a cross-linking agent, 3-8 parts of a reinforcing agent and 0.01-0.04 part of an initiating agent. The mixed monomers are prepared from acrylamide, acrylic acid and 2-acrylamido-2-methyl propanesulfonic acid in the mass ratio of (1.5-2.2):(1.5-2.5):(7.5-8.5). The reinforcing agent is sodium bentonite. The profile control agent has the advantages that the water swelling rate is high, and thus the requirement for effective plugging of large water channeling pore passages can be met; 2, the water swelling speed is low, and thus the requirement for stratum deep injection can be met; 3, the profile control agent has high strength and flexibility after water swelling; 4, the profile control agent is good in temperature resistance and salt resistance, and capable of effectively plugging channeling passages in polymer flooding-to-water flooding oil deposits, improving water injection profiles, making subsequently-injected water turn in the deep, increasing the swept volume and improving the subsequent water flooding efficiency.

Description

technical field [0001] The invention relates to a pre-crosslinked bulky profile control agent, and also relates to a preparation method and application of the profile control agent, belonging to the technical field of oil field chemistry. Background technique [0002] Profile control technology is a technology to control water, stabilize production and increase production in waterflood development oilfields. The main function of profile control is to block the dominant channel of water channeling, expand the swept volume of injected water, and improve the effect of water flooding development. For water injection development oilfields, due to the heterogeneity of the reservoir and the continuous water injection development, the dominant channels of channeling flow are formed, and the injected water quickly rushes towards the oil well, resulting in water flooding of the oil well, a decrease in production, and an increase in water cut , the development effect becomes worse. A...

Claims

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Application Information

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IPC IPC(8): C09K8/512C08F220/58C08F220/56C08F220/06C08F222/38C08F2/44
CPCC08F2/44C08F220/58C08F220/585C09K8/5083C09K8/512C09K2208/18C08F220/56C08F220/06C08F222/385
Inventor 李飞鹏郭晶晶邢德刚王孟江燕收广耿超杜雪花
Owner CHINA PETROLEUM & CHEM CORP
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