# US 12,180,409 B1 · Double-crosslinked thermal phase transition gel temporary plugging agent and application thereof

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- Number: US 12,180,409 B1
- Document ID: US12180409B1
- Status: Granted
- Kind: B1
- Application number: 18/824,209
- Filed: 2024-09-04
- Granted: 2024-12-31
- Earliest claimed: 2024-05-09
- Assignees: Southwest Petroleum University
- Applicants: Southwest Petroleum University
- Inventors: Yu Peng; Pengjun Shi; Yongming Li; Zhenglan Li; Jiandu Ye; Jinzhou Zhao
- Web page: https://patentgrep.com/patent/US12180409B1

## CPC

- C09K 5/06: the change of state being from liquid to solid or vice versa
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08F 220/20: of polyhydric alcohols or phenols {, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate}
- C08F 220/585: {and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]}
- C09K 8/5083: {obtained by reactions only involving carbon-to-carbon unsaturated bonds}
- C09K 8/5086: {obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds}
- C08K 3/346: {Clay}
- C08K 3/38: Boron-containing compounds
- C09K 8/24: Polymers
- C09K 8/512: containing cross-linking agents
- Y02P 20/141: Feedstock
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention discloses a double-crosslinked thermal phase transition gel temporary plugging agent and an application thereof, and relates to the technical field of oil and gas field development. The gel temporary plugging agent comprises the following components in percentage by weight: 5.8-18.3% of acrylic acid, 2.8-6.5% of 2-acrylamide-2-methylpropanesulfonic acid, 2.8-7.0% of hydroxyethyl acrylate, 0.2-1.0% of a degradable crosslinking agent, 0.4-1.2% of borax or boric acid, 0.2-0.8% of a high-temperature initiator, 2.6-4.5% of palygorskite attapulgite, 1.5-3.1% of a urea-formaldehyde resin, and the balance of water, wherein the gel temporary plugging agent is formed by underground gelation. The gel temporary plugging agent is applied to oil and gas reservoirs with a temperature of 100-150° C., can automatically be subjected to gelation and degradation, and has a low filtration loss before gelation.

## Claims

### Claim 1

A double-crosslinked thermal phase transition gel temporary plugging agent, comprising the following components in percentage by weight: 5.8-18.3% of acrylic acid, 2.8-6.5% of 2-acrylamide-2-methylpropanesulfonic acid, 2.8-7.0% of hydroxyethyl acrylate, 0.2-1.0% of a degradable crosslinking agent, 0.4-1.2% of borax or boric acid, 0.2-0.8% of a high-temperature initiator, 2.6-4.5% of palygorskite attapulgite, 1.5-3.1% of a urea-formaldehyde resin, and a balance of water, wherein the gel temporary plugging agent is formed by underground gelation; and the degradable crosslinking agent is at least one of polyethylene glycol diacrylate and 1,6-hexanediol diacrylate, and the high-temperature initiator is at least one of dicumyl peroxide, tert-butyl peroxybenzoate, and tert-butyl hydroperoxide.

### Claim 2 (depends on 1)

The double-crosslinked thermal phase transition gel temporary plugging agent according to claim 1, further comprising a pH adjuster, wherein a pH of the gel temporary plugging agent is adjusted to 6.5 to 8.5 by the pH adjuster.