Active pre-crosslinking gel particle

Abstract

The invention provides an active pre-crosslinking gel particle and a preparation method thereof. The active pre-crosslinking gel particle is prepared from the components of acrylamide, anionic monomer, 3-alkyl-4-styrene fatty alcohol polyoxyethylene alkyl ether sodium sulfonate, N, N-methylene diacrylamide, tetramethyl ethylenediamine and deionized water. The preparation method comprises the steps of initiating polymerization crosslinking of the acrylamide and the anionic monomer by an initiator, and carrying out physical means of cutting, pelletizing, drying, crushing and the like to prepare the active pre-crosslinking gel particle finally. With the adoption of the active pre-crosslinking gel particle, as the 3-alkyl-4-styrene fatty alcohol polyoxyethylene alkyl ether sodium sulfonate is added in the active pre-crosslinking gel particle, a single component of polymer has the interfacial activity and the emulsifying property; when the active pre-crosslinking gel particle is taken as a profile control agent, the plugging rate reaches 72.56 percent.

Description

Technical field

[0001] The invention belongs to the technical field of petroleum exploitation, and specifically relates to a pre-crosslinked gel particle used for the combination of oil reservoir control and flooding, in particular to an active pregel particle and a preparation method thereof. Background technique

[0002] In oilfields developed by long-term water injection, due to various reasons, the injected water flows into the production well along the high-permeability zone, resulting in inefficient circulation of injected water, which greatly affects the degree of crude oil production. Adjusting the water absorption profile is an important means to solve this problem. Among them, the effective method is to use chemical agents to block the water layer through chemical means, including inorganic particles, composite particles, pre-crosslinked particles, weak gels and strong coagulation. Glue etc. The pre-crosslinked swelling particles have the characteristics of swelling wi...

Examples

preparation example Construction

[0025] 1. Preparation of active pre-crosslinked gel particles

[0026] An active pre-crosslinked gel particle, comprising acrylamide, anionic monomer, sodium 3-alkyl-4-styrene fatty alcohol polyoxyethylene ether sulfonate, N,N-methylenebisacrylamide, tetramethyl Ethylenediamine and deionized water. The active pre-crosslinked gel is mainly obtained by polymerizing and crosslinking composite monomers and crosslinking agent anionic monomers through initiators, and finally through cutting, granulating, drying, pulverizing and other physical means to make the active pre-crosslinking gel. Glue particles.

Embodiment 1

[0028] An active pre-crosslinked gel particle consisting of the following components:

[0029]

[0030] Preparation Process:

[0031] Dissolve 120 parts of acrylamide in 230 parts of deionized water to make an aqueous solution, stir to make it fully dissolved, and add 5 parts of fluorinated methacrylic acid and 5 parts of 3-alkyl-4-benzene to the prepared acrylamide aqueous solution. Sodium ethylene fatty alcohol polyoxyethylene ether sulfonate, 2 parts of N,N-methylenebisacrylamide, and 0.1 part of tetramethylethylenediamine are stirred to form a uniform mixture. Transfer the uniformly mixed mixture into the reactor, and control the temperature of the reactor within the range of 21-22°C. After purging with nitrogen for 30 minutes, add 0.03 part of azobisisoheptonitrile and stir evenly, and continue to purify with nitrogen for 10 minutes. Add 0.025 part of potassium persulfate and stir evenly, then continue to pass nitrogen for 10 minutes, then add 0.025 part of sodium thiosulfate...

Embodiment 2

[0033]

[0034] The preparation process of the active pre-crosslinked gel particles is the same as that in Example 1.

Technical field

[0001] The invention belongs to the technical field of petroleum exploitation, and specifically relates to a pre-crosslinked gel particle used for the combination of oil reservoir control and flooding, in particular to an active pregel particle and a preparation method thereof. Background technique

[0002] In oilfields developed by long-term water injection, due to various reasons, the injected water flows into the production well along the high-permeability zone, resulting in inefficient circulation of injected water, which greatly affects the degree of crude oil production. Adjusting the water absorption profile is an important means to solve this problem. Among them, the effective method is to use chemical agents to block the water layer through chemical means, including inorganic particles, composite particles, pre-crosslinked particles, weak gels and strong coagulation. Glue etc. The pre-crosslinked swelling particles have the characteristics of swelling wi...

Examples

preparation example Construction

[0025] 1. Preparation of active pre-crosslinked gel particles

[0026] An active pre-crosslinked gel particle, comprising acrylamide, anionic monomer, sodium 3-alkyl-4-styrene fatty alcohol polyoxyethylene ether sulfonate, N,N-methylenebisacrylamide, tetramethyl Ethylenediamine and deionized water. The active pre-crosslinked gel is mainly obtained by polymerizing and crosslinking composite monomers and crosslinking agent anionic monomers through initiators, and finally through cutting, granulating, drying, pulverizing and other physical means to make the active pre-crosslinking gel. Glue particles.

Embodiment 1

[0028] An active pre-crosslinked gel particle consisting of the following components:

[0029]

[0030] Preparation Process:

[0031] Dissolve 120 parts of acrylamide in 230 parts of deionized water to make an aqueous solution, stir to make it fully dissolved, and add 5 parts of fluorinated methacrylic acid and 5 parts of 3-alkyl-4-benzene to the prepared acrylamide aqueous solution. Sodium ethylene fatty alcohol polyoxyethylene ether sulfonate, 2 parts of N,N-methylenebisacrylamide, and 0.1 part of tetramethylethylenediamine are stirred to form a uniform mixture. Transfer the uniformly mixed mixture into the reactor, and control the temperature of the reactor within the range of 21-22°C. After purging with nitrogen for 30 minutes, add 0.03 part of azobisisoheptonitrile and stir evenly, and continue to purify with nitrogen for 10 minutes. Add 0.025 part of potassium persulfate and stir evenly, then continue to pass nitrogen for 10 minutes, then add 0.025 part of sodium thiosulfate...

Embodiment 2

[0033]

[0034] The preparation process of the active pre-crosslinked gel particles is the same as that in Example 1.

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