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Thickening agent, composition forming same, emulsion polymer, fracturing fluid system and application thereof

A technology of thickening agent and composition, which is applied in the direction of drilling composition, chemical instruments and methods, and can solve the problem of less residue

Active Publication Date: 2022-03-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a thickener, a composition forming it, an emulsion polymer, a fracturing fluid system and its application, so as to solve the problem that the existing fracturing fluid system cannot meet the requirements of low damage to the formation and low residue Requirements such as less, shear resistance and convenient preparation process

Method used

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  • Thickening agent, composition forming same, emulsion polymer, fracturing fluid system and application thereof
  • Thickening agent, composition forming same, emulsion polymer, fracturing fluid system and application thereof
  • Thickening agent, composition forming same, emulsion polymer, fracturing fluid system and application thereof

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preparation example Construction

[0047] Preferably, the preparation method of the thickener comprises: acrylamide, N,N-dimethylacrylamide, sodium acrylate, cationic polymerizable surfactant, viscoelastic surfactant, initiator, optional inorganic salt, Optional organic salts, optional co-solvents, and optional heat stabilizers are prepared according to a predetermined ratio; after mixing the raw materials evenly, the temperature is controlled within the range of 5°C to 50°C, and nitrogen gas is introduced for 30 minutes to remove oxygen in the reaction solution , adding an initiator, the temperature for initiating the polymerization reaction is 5°C to 50°C, and after the end of the polymerization reaction, continue to keep warm for 2 to 4 hours to obtain rubber blocks; chemical powder products.

[0048] Another aspect of the present application also provides a thickener, which is prepared from the composition for forming the thickener provided in the present application as a raw material by polymerization unde...

Embodiment 1

[0063] Based on 100 parts by weight, the raw materials for the preparation of the thickener include: 20 parts of acrylamide, 20 parts of N,N-dimethylacrylamide, 30 parts of sodium acrylate, 8 parts of p-bromostyrene octadecyldimethyl tertiary Amine quaternary ammonium salt, 3 parts cis-13-docenoamidopropyl dimethyl hydroxypropyl sulfobetaine, 0.5 part initiator (azobisisobutylamidine hydrochloride), 1.5 parts organic salt (sodium salicylate), 5 parts of inorganic salt (potassium chloride), and the balance is water.

[0064] Wherein, the preparation steps of cationic surfactant are as follows:

[0065] Add 80.0g of octadecyldimethyl tertiary amine into a single-necked flask, add 100.0mL of absolute ethanol to dissolve, raise the temperature to 50°C, slowly add 40.0g of p-bromostyrene, react for 10h, and distill under reduced pressure to obtain a light yellow viscous The product was put into a vacuum drying oven at 60°C and vacuum-dried to obtain a white solid product with a mo...

Embodiment 2

[0071] The difference from Example 1 is: based on 100 parts by weight, the raw materials for the preparation of the thickener include: 10 parts of acrylamide, 20 parts of N,N-dimethylacrylamide, 15 parts of sodium acrylate, 15 parts of long carbon chain tertiary Amine quaternary ammonium salt polymerizable surfactant, 0.2 part of viscoelastic surfactant, 0.01 part of initiator, and the balance is water. The molecular weight of the thickener is 8 million.

[0072] Adopt the method identical with embodiment 1 to make emulsion polymer, be recorded as sample 2.

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Abstract

The invention provides a thickening agent, a composition for forming the thickening agent, an emulsion polymer, a fracturing fluid system and application of the thickening agent. The molecular weight of the thickening agent is 100,000-10,000, and the composition for forming the thickening agent comprises the following components in parts by weight: 10-20 parts of acrylamide, 1-20 parts of N, N-dimethylacrylamide, 10-80 parts of sodium acrylate, 1-15 parts of a cationic polymerizable surfactant, 0.2-3 parts of a viscoelastic surfactant, 0-3 parts of organic salt, 0-5 parts of inorganic salt, 0.01-1 part of an initiator and the balance of water, the cationic polymerizable surfactant is a polymer formed by copolymerization of tertiary aliphatic amine with the C atom number of 12-22 and halogenated olefin, and the molecular weight of the cationic polymerizable surfactant is 303-443. The thickening agent prepared from the composition has the advantages of high temperature resistance, high viscosity, simplicity and convenience in use and the like.

Description

technical field [0001] The invention relates to the field of fracturing fluid preparation, in particular to a thickener, a composition forming it, an emulsion polymer, a fracturing fluid system and applications thereof. Background technique [0002] Guar gum fracturing fluid inevitably has water-insoluble residues, and some commercial guar gums contain water-insoluble impurities as high as about 10%. The residue content in the cross-linked guar gum fracturing fluid system is relatively high, which is very harmful to the formation, generally more than 30%. [0003] In order to reduce the damage of the fracturing fluid system to the formation, researchers have developed some other types of fracturing fluid systems. For example, the low-damage VES clean fracturing fluid, but the amount of surfactant added in the fracturing fluid system is more than 3%, the cost is high, the fluid loss is large, and the applicable reservoir temperature generally does not exceed 120°C. In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F220/54C08F212/14C08F220/70C09K8/68C09K8/88
CPCC08F220/06C08F220/54C09K8/68C09K8/882C09K2208/26C08F220/56C08F212/26C08F220/70
Inventor 蒋其辉杨向同张晔张扬侯腾飞张奎马汝涛李会丽乔岩袁亮
Owner BC P INC CHINA NAT PETROLEUM CORP
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