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Acrylamide-based terpolymer, drag reducer for fracturing, and preparation method thereof

A technology of acrylamide-based terpolymer and drag reducer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems that cannot meet the requirements of shale gas fracturing, such as large displacement, large flow on-line preparation, emulsion High viscosity, low effective content and other problems, to achieve the effect of improving drag reduction efficiency and shear resistance, good environmental protection performance, and fast dissolution speed

Active Publication Date: 2018-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the degradation of natural macromolecules under acidic conditions and the loss of drag reducing properties, currently used drag reducing agents are mainly some synthetic high molecular polymers. CN103820099A discloses an acid drag reducing agent and its preparation method. It is made of propylene Amide, 2-acrylamido-2-methylpropanesulfonic acid and long-chain cationic monomers are prepared by polymerization, drying, and pulverization in aqueous solution. When applied, the drag reducer dissolves for as long as 1-2 hours, which cannot meet the requirements of the page. Rock gas fracturing requires large displacement and large flow on-line preparation
[0005] CN103694984A discloses a shale gas acidizing fracturing drag reducer and a preparation method thereof. The drag reducer is prepared by an inverse emulsion method, and the inverse emulsion contains a large amount of organic solvents and surfactants. After the resist is injected into the formation, it will cause groundwater pollution, which cannot meet the requirements of environmental protection
[0006] CN102977877A also discloses a drag reducer for shale gas fracturing and a preparation method thereof, in which acrylamide, 2-acrylamido-2-methyl A drag reducer for shale gas fracturing obtained by random copolymerization of three monomers, sodium propanesulfonate and sodium acrylate, and a preparation method thereof. The method does not contain organic solvents and is environmentally friendly, but the use concentration is low due to the low effective content It needs to reach 0.2% to have a good drag-reducing performance, and 2-acrylamido-2-methylpropanesulfonate sodium has a certain solubility in brine, resulting in a high viscosity of the prepared emulsion, which is not conducive to practical application

Method used

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  • Acrylamide-based terpolymer, drag reducer for fracturing, and preparation method thereof
  • Acrylamide-based terpolymer, drag reducer for fracturing, and preparation method thereof
  • Acrylamide-based terpolymer, drag reducer for fracturing, and preparation method thereof

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preparation example Construction

[0067] In a fourth aspect, the present invention provides a method for preparing a drag reducer for shale gas fracturing, the method comprising: the method comprises: under the solution polymerization reaction conditions of olefins and in the presence of an initiator, the D, the monomer mixture of monomer E and monomer F, a stabilizer and an inorganic salt are mixed and reacted, wherein, the monomer D is a monomer having a structure shown in formula (4), and the monomer E is a monomer having A monomer of structure shown in formula (5), said monomer F is a monomer with structure shown in formula (6),

[0068]

[0069] Among them, R 1 -R 3 and m and M are as defined above in the present invention.

[0070] Preferably, in the present invention, based on the total weight of the monomer mixture, the monomer D is used in an amount of 40-75% by weight, and the monomer E is used in an amount of 5-30% by weight. The amount of monomer F used is 5-50% by weight.

[0071] Preferabl...

preparation example 1

[0082] This preparation example is used to prepare the stabilizer used in the present invention.

[0083] In a 1.5L polymerization kettle equipped with a thermometer, a stirring rod and a condenser tube, add 10g of acrylamide, 190g of sodium 2-acrylamido-2-methylpropanesulfonate and 800g of deionized water, raise the temperature to 60°C, and dissolve completely Finally, nitrogen was passed to remove oxygen, 0.2 g of azobisisobutylimidazoline hydrochloride was added, the reaction was stopped after stirring for 6 hours, dried and pulverized to obtain stabilizer W for future use.

preparation example 2

[0085] This preparation example is used to prepare the acrylamide-based terpolymer of the present invention.

[0086] Add 595 g of deionized water, 134.6 g of acrylamide, 47.4 g of sodium acrylate, N-(2 -Hydroxypropyl)methacrylamide 18g, stir to dissolve the solid completely, then heat up to 40°C; add 0.02g of 2,2'-azobisisobutylamidine hydrochloride after 20 minutes of blowing nitrogen, continue stirring with nitrogen After reacting for 3 hours, an acrylamide terpolymer with a viscosity average molecular weight of 557,000 was obtained. The acrylamide terpolymer was measured by IR spectrum. In the IR spectrum, 1660cm -1 and 1635cm -1 The amide I band absorption peak (C=O stretching vibration) and the amide II band absorption peak (N-H bending vibration) respectively appear at the amide group; at 1430cm -1 C-N stretching vibration absorption peaks appear at ; 1356 and 1401cm -1 A typical methyl symmetrical bending vibration absorption peak appears; 2923cm -1 、2852cm -1 The...

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Abstract

The invention relates to the fields of shale gas exploitation, fracturing, and yield increasing, and discloses an acrylamide terpolymer, a drag reducer for fracturing, and preparation methods of the terpolymer and the drag reducer. The acrylamide terpolymer comprises a structure unit (A), a structure unit (B), and a structure unit (C). The structure of the structure unit (A) is represented by the formula (1). The structure of the structure unit (B) is represented by the formula (2). The structure of the structure unit (C) is represented by the formula (3). The provided drag reducer for shale gas fracturing has the advantages of high drag reducing efficiency, strong shearing resistant performance, low viscosity, good fluidity, quick dissolving speed, and environment-friendliness.

Description

technical field [0001] The invention relates to the field of shale gas exploitation and fracturing stimulation, in particular to an acrylamide-based terpolymer and a preparation method thereof, a drag reducer for shale gas fracturing and a preparation method thereof. Background technique [0002] Shale gas resources are very rich. However, due to the low permeability of shale matrix (generally less than 1mD), the development technology is very difficult. More than 90% of shale gas wells need to be fractured to obtain ideal production. [0003] At present, shale gas fracturing and stimulation operations often use drag-reducing water for fracturing and stimulation operations. Drag-reducing water fracturing is a fracturing operation in which a small amount of additives such as fracturing fluid drag reducers, drainage aids, and fungicides are added to water as fracturing fluid. Different from gel fracturing fluid, drag-reducing water fracturing can significantly reduce fracturi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C09K8/68
Inventor 张文龙刘希祝纶宇伊卓杜超方昭胡晓娜
Owner CHINA PETROLEUM & CHEM CORP