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Flexible gel particle and flexible gel particle plugging agent prepared from the same

A gel particle and flexible technology, applied in the field of plugging agent for oil and water wells, can solve the problems of difficult control of polymerization process, complex preparation process, unsuitable for batch production, etc., and achieve the requirements of less stringent water quality, simple preparation process and less formation pollution Effect

Active Publication Date: 2015-09-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the flexible particles have good temperature resistance, due to the complex preparation process, the raw materials have problems such as flammability, toxicity, chemical corrosion, and poor environmental protection, and the preparation process is violently exothermic, dangerous to operate, difficult to control the polymerization process, and the molecular weight of the polymerization product Wide distribution and therefore not suitable for mass production

Method used

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  • Flexible gel particle and flexible gel particle plugging agent prepared from the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a flexible gel particle plugging control agent. In terms of weight percentage, the preparation raw materials of the flexible gel particle plugging control agent include:

[0045] Acrylamide: 8wt%;

[0046] Vinyltriethoxysilane: 5wt%;

[0047] n-Butyl acrylate: 8wt%;

[0048] Sodium persulfate: 0.04wt%;

[0049] Methylenebisacrylamide: 0.05wt%;

[0050] Potassium ferricyanide: 0.04wt%;

[0051] Partially hydrolyzed polyacrylamide: 0.5wt%, number average molecular weight of 12 million, degree of hydrolysis of 20%;

[0052] Rx-80 resin: 3wt%;

[0053] Water: balance.

[0054] The preparation method of the flexible gel particle plugging regulator is as follows:

[0055] Add acrylamide, vinyltriethoxysilane, and n-butyl acrylate to clear water, stir and heat up to 55°C, add sodium persulfate, methylenebisacrylamide, potassium ferricyanide, stir continuously, and then add partial hydrolysis Polyacrylamide, Rx-80 resin, polymerized and cross-li...

Embodiment 2

[0063] This embodiment provides a flexible gel particle plugging regulator.

[0064] In weight percentage, the preparation raw materials of the flexible gel particle plugging regulator include:

[0065] Acrylamide: 10wt%;

[0066] Vinyltrimethoxysilane: 8wt%;

[0067] Isohexyl acrylate: 12wt%;

[0068] Ammonium persulfate: 0.06wt%;

[0069] Ethylene glycol dimethacrylate: 0.08wt%;

[0070] Disodium EDTA: 0.06wt%;

[0071] Partially hydrolyzed polyacrylamide: 0.8wt%, number average molecular weight of 16 million, degree of hydrolysis of 25%;

[0072] Dioctyl phthalate: 5wt%;

[0073] Water: balance.

[0074] The preparation method of the flexible gel particle plugging regulator is as follows:

[0075] Add acrylamide, vinyltrimethoxysilane, and isohexyl acrylate to oilfield reinjection sewage, stir and heat up to 55°C, add ammonium persulfate, ethylene glycol dimethacrylate, and disodium EDTA, stir continuously, and then Partially hydrolyzed polyacrylamide and dioctyl p...

Embodiment 3

[0082] This embodiment provides a flexible gel particle plugging regulator.

[0083] In weight percentage, the preparation raw materials of the flexible gel particle plugging regulator include:

[0084] Acrylamide: 9wt%;

[0085] Vinyl tributoxysilane: 7wt%;

[0086] Isobutyl acrylate: 10wt%;

[0087] Benzoyl peroxide: 0.05wt%;

[0088] Trimethylpropane trimethyl acrylate: 0.06wt%;

[0089] Tetrasodium EDTA: 0.05wt%;

[0090] Partially hydrolyzed polyacrylamide: 0.5wt%, number average molecular weight of 16 million, degree of hydrolysis of 25%;

[0091] Coumarone resin: 4wt%;

[0092] Water: balance.

[0093] The preparation method of the flexible gel particle plugging regulator is as follows:

[0094] Add acrylamide, vinyltributoxysilane, and isobutyl acrylate to clear water, stir and heat up to 55°C, add benzoyl peroxide, trimethylpropane trimethyl acrylate, and tetrasodium EDTA, and keep stirring. Then add partially hydrolyzed polyacrylamide and coumarone resin to ...

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Abstract

The present invention provides a flexible gel particle and a flexible gel particle plugging agent prepared from the same. The raw materials for preparing the gel particle comprise, by weight, 6-12wt% of acrylamide, 3-12wt% of temperature tolerant monomer, 5-15wt% of alkali and salt resistant monomer, 0.2-1wt% of partially hydrolyzed polyacrylamide with high and middle molecular weight, 0.02-0.08wt% of an initiator, 0.04-0.1wt% of a crosslinking agent, 0.01-0.1wt% of a retarder, 1-8wt% if a plasticizer and the balance of water. The temperature tolerant monomer includes Si-O bond monomer; the alkali and salt resistant monomer includes acrylate monomer; and the partially hydrolyzed polyacrylamide with high and middle molecular weight has number-average molecular weight of 8-16 million. The flexible gel particle is prepared into a suspension with certain concentration by water or polyacrylamide solution, so as to prepare the flexible gel particle plugging agent. The flexible gel particle plugging agent provided by the invention has the advantages of environment-friendliness, low cost, little pollution to the stratum, no toxicity, and simple preparation process.

Description

technical field [0001] The invention belongs to the field of plugging regulators for oil and water wells, in particular to a flexible gel particle and a plugging regulator made of the flexible gel particles. Background technique [0002] At present, thin oil, high pour point oil and ordinary heavy oil reservoirs in Liaohe Oilfield generally adopt the water injection development method, and the water flooding control reserves reach 1.019 billion tons, all of which have entered the stage of high water cut in the middle and late stages of development. Influenced by this, the average comprehensive water cut of the 15 main deep control and flooding blocks currently reaches 86%. At present, technologies such as profile control and water shutoff, deep profile control and flooding, and binary flooding are often used to improve the development effect of water flooding. However, conventional profile control and water shutoff agents have poor selectivity, are easy to pollute oil layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 陈小凯刘德铸曾双红王浩郑猛李瑞吴赞美龙华任杰柳荣伟杨连行贺梦琦李贞徐薇薇陈凯
Owner PETROCHINA CO LTD
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