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Resistance reducing agent for fracture and preparation method thereof

A drag-reducing agent and fracturing technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low clay expansion inhibition, slow dissolution rate of drag-reducing agent, low storage stability, etc., and achieve clay High swelling inhibition, improved and shear resistance, good water solubility

Active Publication Date: 2015-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of slow dissolution rate, low drag reduction rate, low storage stability, low clay expansion inhibition, poor shear resistance and high formation damage in the above-mentioned prior art, and provide a Preparation method of drag reducing agent for fracturing, and a drag reducing agent for fracturing prepared by the method

Method used

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  • Resistance reducing agent for fracture and preparation method thereof
  • Resistance reducing agent for fracture and preparation method thereof
  • Resistance reducing agent for fracture and preparation method thereof

Examples

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preparation example Construction

[0033] In one aspect, the present invention provides a method for preparing a drag reducing agent for fracturing, the method comprising:

[0034] (1) Mix acrylamide-based monomers, anionic monomers containing double bonds, cationic polymer templates, chelating agents, molecular weight modifiers and water and adjust the pH value to obtain an aqueous solution with a pH value of 6-9;

[0035] (2) Contact the organic solvent with the emulsifier to obtain an oil solution;

[0036] (3) contacting the aqueous solution obtained in step (1) with the oil solution obtained in step (2) to obtain a water-in-oil emulsion;

[0037] (4) Under an inert atmosphere, contact the water-in-oil emulsion obtained in step (3) with an initiator in batches, and carry out a polymerization reaction, and then contact the mixture obtained by the polymerization reaction with a phase inversion agent;

[0038] Wherein, the hydrophilic-lipophilic balance value of the emulsifier is 4-6, the molecular weight of ...

Embodiment 1

[0078] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0079] (1) At 15°C, mix 100g of acrylamide, 35g of acrylic acid, 2g of polymethacryloxyethyltrimethylammonium chloride (molecular weight: 200,000), 0.1g of disodium edetate, 0.05 1g sodium formate and 120g deionized water are mixed in a 1000mL beaker, stirred until fully dissolved, then slowly adding 10% by weight aqueous sodium hydroxide solution to adjust the pH value to 8, to obtain an aqueous solution with a pH value of 8;

[0080] (2) Mix 10.5g Span-80 and 1.5g Tween-80 to obtain a mixed emulsifier, and calculate the hydrophilic-lipophilic balance value of the mixed emulsifier to be 5, then mix the mixed emulsifier with 120g white oil (boiling point distillation range is 220-255°C, flash point is 80°C) mixed in a 1500mL beaker until completely dissolved to obtain an oil solution;

[0081] (3) Add the aqueous solution obtained in step (1)...

Embodiment 2

[0084] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0085] (1) At 25°C, mix 100g of acrylamide, 50g of sodium acrylate, 5g of polymethacryloxyethyltrimethylammonium chloride (molecular weight: 10,000), 0.2g of disodium edetate, 0.1g of sodium formate and 150g of deionized water were mixed in a 1000mL beaker, stirred until completely dissolved, then slowly adding 10% by weight aqueous sodium hydroxide solution to adjust the pH to 9, to obtain an aqueous solution with a pH of 9;

[0086] (2) Mix 10.5g Span-80 and 4.5g Tween-80 to obtain a mixed emulsifier. The calculated hydrophilic-lipophilic balance value of the mixed emulsifier is 6, and then mix the mixed emulsifier with 150g white oil (boiling point distillation range is 240-280°C, flash point is 100°C) in a 1500mL beaker until completely dissolved to obtain an oil solution;

[0087] (3) Add the aqueous solution obtained in step (1) to the ...

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Abstract

The invention relates to a preparation method of a resistance reducing agent for fracture. The preparation method includes the steps of: (1) mixing an acrylamide-series monomer, an anionic monomer containing a double bond, a cationic polymer template, a chelating agent and a molecular weight regulating agent with water with pH value being regulated to obtain a water solution of which the pH value is 6-9; (2) contacting an organic solvent with an emulsification agent to obtain an oil solution; (3) contacting the water solution with the oil solution to obtain a water-in-oil emulsion; and (4) under an inert atmosphere, contacting the water-in-oil emulsion with an initiator in batches, performing a polymerization reaction to obtain a mixture, and contacting the mixture with a phase conversion agent. The emulsification agent is 4-6 in hydrophilic-lipophilic balance value, the molecular weight of the anionic polymer template is less than 1000000, and the structure formula of the anionic polymer template is represented as the formula (I). The invention also relates to the resistance reducing agent for fracture prepared through the method. The resistance reducing agent for fracture is high in resistance reducing rate, is high in inhibition on clay expansion, is good in water solubility and is low in formation damage property.

Description

technical field [0001] The invention relates to a drag reducing agent for fracturing and a preparation method of the drag reducing agent for fracturing. Background technique [0002] Shale gas reservoirs are characterized by low porosity and low permeability, and are difficult to exploit. At present, the slick water fracturing process is mainly used for exploitation. The fracturing fluid is pressurized by the high-pressure pump injection equipment, and then pumped into the formation at high speed through the pipe string , under high pressure and high speed conditions, the turbulence phenomenon is serious during the flow of fluid in the pipe, and there is a large frictional resistance between the fracturing fluid and the pipe wall. Energy loss increases. Therefore, it is necessary to add a drag reducing agent to the fluid to reduce the influence of frictional resistance and improve construction efficiency. [0003] The drag reducing agent is to add a small amount of high mo...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F220/56C08F220/06C08F220/58C08F2/32
Inventor 张文龙祝纶宇杜超伊卓赵方园
Owner CHINA PETROLEUM & CHEM CORP
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