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Gelling agent for acid fracturing operation and preparation method thereof

An acid fracturing, gelling agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing the efficiency of acid fracturing, shear instability, long dissolution time, etc. The effect of reducing the liquid preparation time, reducing the labor intensity of acid preparation, and improving the efficiency of acid preparation

Active Publication Date: 2022-07-29
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the ordinary cationic homopolymer commonly used as acidifying gelling agent can meet the general operation requirements, but it is a powder product, which takes a long time to dissolve in acid, and has the disadvantages of dust and easy caking when stored for a long time. It also has problems such as high temperature instability and shear instability in the acid liquid system, which reduces the efficiency of acid fracturing operations

Method used

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  • Gelling agent for acid fracturing operation and preparation method thereof

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preparation example Construction

[0043] The invention provides a preparation method of a gelling agent for acidizing and fracturing operations, the preparation method comprising:

[0044] Step (1): carry out esterification reaction with methyl 2-benzyl acrylate and N,N-dimethylethanolamine, and then add chloromethane to carry out quaternization reaction to obtain functional cationic monomer;

[0045] Step (2): mixing the functional cationic monomer, cationic monomer, non-ionic monomer, sulfonic acid-based monomer, ammonium chloride and deionized water to obtain an aqueous reaction solution;

[0046] Step (3): mixing the oily solvent and the emulsifier to obtain an oil-phase reaction solution;

[0047] Step (4): adding the oil phase reaction solution to the water phase reaction solution, then adding an initiator to initiate a polymerization reaction, and adding a phase inversion agent after the reaction is completed to obtain a gelling agent for acid fracturing operations.

[0048] It should be noted that the...

Embodiment 1

[0094] Preparation of functional cationic monomers:

[0095] 1.1 mol of methyl 2-benzyl acrylate and 1 mol of N,N-dimethylethanolamine, as well as metal calcium and polymerization inhibitor (hydroquinone) were added to the reactor, and the temperature was raised to 110-120 °C while stirring and reacted 4h, the esterified product was obtained. The esterification product is naturally cooled to room temperature, and monochloromethane is added in batches under stirring conditions to control the temperature of the reaction process at 20~70 ° C. After the addition of monochloromethane, the temperature of the reactor no longer rises as a reaction. After the reaction is completed, the temperature is kept for 2 hours to obtain a functional cationic monomer; wherein, the molar ratio of the esterification product to chloromethane is 1:1.

[0096] Preparation of gelling agent for acid fracturing operation:

[0097] (1) 170 parts of functional cationic monomer, 10 parts of methacryloylox...

Embodiment 2

[0101] Preparation of functional cationic monomers:

[0102] 1.3 mol of methyl 2-benzyl acrylate and 1 mol of N,N-dimethylethanolamine, as well as metal calcium and polymerization inhibitor (hydroquinone) were added to the reactor, and the temperature was raised to 110-120 ° C while stirring and reacted 5h, the esterified product was obtained. The esterification product is naturally cooled to room temperature, and monochloromethane is added in batches under stirring conditions to control the temperature of the reaction process at 20~70 ° C. After the addition of monochloromethane, the temperature of the reactor no longer rises as a reaction. After the reaction is completed, the temperature is kept for 2 hours to obtain a functional cationic monomer; wherein, the molar ratio of the esterification product to monochloromethane is 1:1.1.

[0103] Preparation of gelling agent for acid fracturing operation:

[0104] (1) 220 parts of functional cationic monomers, 15 parts of acrylo...

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Abstract

The invention provides a gelling agent for acid fracturing operation and a preparation method thereof, and relates to the field of oilfield chemical assistants.The method comprises the steps that 2-methyl benzylacrylate and N, N-dimethylethanolamine are subjected to an esterification reaction, then methane chloride is added for a quaternization reaction, and a functional cationic monomer is obtained; the preparation method comprises the following steps: uniformly mixing a functional cationic monomer, a cationic monomer, a nonionic monomer, a sulfonic monomer, ammonium chloride and deionized water to obtain a water-phase reaction solution; uniformly mixing an oily solvent and an emulsifier to obtain an oil-phase reaction solution; and adding the oil-phase reaction liquid into the water-phase reaction liquid, then adding an initiator to initiate a polymerization reaction, and after the reaction is completed, adding a phase inversion agent to obtain the gelling agent for acid fracturing operation. The gelling agent for acid fracturing operation prepared by the invention is high in stability, high in dispersion speed and good in high temperature resistance, has the advantages of high viscosity, no residue, convenience in use and the like, and can improve the efficiency of acid fracturing operation.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical additives, in particular to a gelling agent for acid fracturing operations and a preparation method thereof. Background technique [0002] Fracturing acidification is an acid treatment process that squeezes acid in the formation under the pressure sufficient to open the formation to form fractures or open the original fractures in the formation. It can improve the permeability of the bottom voids and fractures, and form a higher conductivity of acid-etched fractures after the fractures are closed, so that the seepage capacity of the formation is improved and improved. The main purpose is to reform the formation and increase the production of oil and gas wells. [0003] Acidizing gelling agent is the key to acidizing fracturing operation and plays a decisive role in acidizing effect. During acid fracturing operation, by adding acidifying gelling agent to the acid, the viscosity of the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/58C08F212/14C08F228/02C08F220/38C09K8/68C09K8/74C09K8/72
CPCC08F220/56C09K8/68C09K8/74C09K8/725C08F220/34C08F220/585C08F212/30C08F228/02C08F220/382
Inventor 荣敏杰于朋朋许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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