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Preparation method of multifunctional emulsion type drag reducer for shale gas fracturing

A multi-functional, drag-reducing agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as cumbersome dosing methods, and achieve the effect of simple and convenient on-site construction

Inactive Publication Date: 2016-06-15
SHENGLI OILFIELD SHENGLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fracturing fluids used in the volume fracturing of tight shale gas reservoirs in the United States and my country at this stage are all so-called "slick water" systems, usually composed of anionic polyacrylamide water-in-oil emulsion drag reducers and drainage aids It consists of three main agents, clay stabilizer and clay stabilizer. During the continuous mixing process on site, three sets of pipelines are required to meter and pump them to the mixing cage of the sand mixer respectively, and the method of dosing is relatively cumbersome.
[0003] Domestic research on "water-in-oil" emulsion polyacrylamide drag reducer is still in its infancy

Method used

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  • Preparation method of multifunctional emulsion type drag reducer for shale gas fracturing
  • Preparation method of multifunctional emulsion type drag reducer for shale gas fracturing
  • Preparation method of multifunctional emulsion type drag reducer for shale gas fracturing

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Effect test

Embodiment 1

[0028] Embodiment 1: the preparation method of a kind of shale gas fracturing multifunctional emulsion type drag reducer mentioned in the present invention is as follows:

[0029] (1) Add 100 parts of white oil, 5 parts of Span80, 1 part of Tween81 into a 500mL beaker, add 0.0001 part of azobisisobutyronitrile as an initiator, dissolve and prepare an oil phase;

[0030] (2) Take 40 parts of deionized water, add 2 parts of acrylic acid, neutralize with potassium hydroxide to pH = 7, then add 14 parts of acrylamide, 2 parts of dimethyl diallyl ammonium chloride, 0.001 part of EDTA Disodium, 0.002 parts urea, formulated as an aqueous phase.

[0031] (3) Put the oil phase in a high-speed emulsifier, start the emulsifier, then add the water phase, and emulsify for 30 minutes to make a monomer emulsion.

[0032] (4) Put the monomer emulsion in a 500mL four-neck flask, pass nitrogen gas to deoxygenate for 30 minutes, turn off the nitrogen gas, turn on the stirring equipment, control...

Embodiment 2

[0040] Embodiment 2: the preparation of the multifunctional emulsion type drag reducer mentioned in the present invention:

[0041] (1) Add 100 parts of white oil and 5 parts of Span80 into a 500mL beaker to dissolve and prepare the oil phase;

[0042] (2) Take 40 parts of deionized water, add 2 parts of acrylic acid, 1 part of 2-acrylamido-2-methylpropanesulfonic acid, neutralize with ammonia water to pH = 7, then add 15 parts of acrylamide, 2 parts Acryloyloxyethyltrimethylammonium chloride, 0.001 part of disodium EDTA, 0.002 part of urea; formulated as an aqueous phase.

[0043] (3) Put the oil phase in a high-speed emulsifier, start the emulsifier, then add the water phase, and emulsify for 30 minutes to make a monomer emulsion.

[0044] (4) Put the monomer emulsion in a 500mL four-neck flask, pass nitrogen gas to deoxygenate for 30 minutes, turn off the nitrogen gas, turn on the stirring equipment, control the speed at 100 rpm, control the temperature at 40°C, react for ...

Embodiment 3

[0052] Embodiment 3: the preparation of the multifunctional emulsion type drag reducer mentioned in the present invention:

[0053] (1) Add 100 parts of cyclohexane, 4 parts of Span80, 1 part of Span83, 1 part of Tween81 into a 500mL beaker, add 0.0001 part of azobisisobutyronitrile as an initiator, dissolve and prepare an oil phase;

[0054] (2) Take 40 parts of deionized water, add 1 part of acrylic acid, neutralize with potassium carbonate to pH = 7, then add 15 parts of acrylamide, 3 parts of trimethallyl ammonium chloride, 0.001 part of disodium EDTA , 0.002 parts of urea; formulated as an aqueous phase.

[0055] (3) Put the oil phase in a high-speed emulsifier, start the emulsifier, then add the water phase, and emulsify for 30 minutes to make a monomer emulsion.

[0056] (4) Put the monomer emulsion in a 500mL four-neck flask, pass nitrogen gas to deoxygenate for 30 minutes, turn off the nitrogen gas, turn on the stirring equipment, control the speed at 100 rpm, contro...

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Abstract

The invention provides a preparation method of a multifunctional emulsion type drag reducer for shale gas fracturing. The preparation method comprises steps as follows: (1) firstly, an aqueous phase is prepared from water, anionic monomers, nonionic monomers and cationic monomers, the anionic monomers are added to the water, the mixture is neutralized to have the pH of 7 by the aid of a functional base, and then the nonionic monomers, the cationic monomers and an aid are added; (2) an oil phase is prepared from a solvent and an emulsifier which accounts for 5%-20% of the solvent in mass; (3) the aqueous phase and the oil phase are mixed, the water accounts for 10%-60% of the mixture in mass in the aqueous phase and oil phase mixture, high-speed shearing emulsification is performed, and then an initiator is slowly added at the reaction temperature of 20-80 DEG C under protection of nitrogen so as to initiate an emulsion polymerization reaction; (4) after the reaction is ended, a product is cooled to the room temperature, a low-surface-tension reverse phase agent is added, and the multifunctional drag reducer is obtained. The preparation method has the benefits as follows: the anti-swelling ability is outstanding, the discharge aiding effect is good, the drag reducer is multifunctional, and construction is convenient.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a preparation method of a multifunctional emulsion type drag reducer for shale gas fracturing. Background technique [0002] In recent years, the development of unconventional oil and gas resources of shale gas has been carried out rapidly in China, setting off an upsurge of unconventional oil and gas exploitation. The fracturing fluids used in the volume fracturing of tight shale gas reservoirs in the United States and my country at this stage are all so-called "slick water" systems, usually composed of anionic polyacrylamide water-in-oil emulsion drag reducers and drainage aids It is composed of three main agents, clay stabilizer and clay stabilizer. During the continuous mixing process on site, three sets of pipelines are required to meter and pump them to the mixing cage of the sand mixer respectively, and the way of dosing is relatively cumbersome. [0003] Do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F220/34C08F226/02C08F2/32C09K8/62
CPCC08F2/32C08F220/56C09K8/62C09K8/882C09K2208/28C08F220/06C08F220/585C08F220/34
Inventor 冯玉军王兵刘虎子顾行彦
Owner SHENGLI OILFIELD SHENGLI CHEM
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