Resistance reducing agent for fracture and preparation method thereof

A drag-reducing agent and fracturing technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high formation damage, low clay swelling inhibition, low storage stability, etc., to achieve improved drag reduction Performance and shear resistance, high suppression of clay swelling, cost reduction effect

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

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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

[0029] In one aspect, the present invention provides a method for preparing a drag reducing agent for fracturing, the method comprising:

[0030] (1) Mix acrylamide-based monomers, cationic monomers containing double bonds, anionic polymer templates, chelating agents, molecular weight modifiers and water and adjust the pH value to obtain an aqueous solution with a pH value of 3-5;

[0031] (2) Contact the organic solvent with the emulsifier to obtain an oil solution;

[0032] (3) contacting the aqueous solution obtained in step (1) with the oil solution obtained in step (2) to obtain a water-in-oil emulsion;

[0033] (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;

[0034] Wherein, the hydrophilic-lipophilic balance value of the emulsifier is 4-6, the molecular weight of ...

Embodiment 1

[0072] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0073] (1) At 15°C, mix 100g of acrylamide, 43.75g of methacryloyloxyethyltrimethylammonium chloride (80% aqueous solution), 2g of poly 2-acrylamido-2-methylpropanesulfonic acid Sodium (molecular weight: 150,000), 0.1g disodium edetate, 0.05g sodium formate and 111.25g deionized water were mixed in a 1000mL beaker, stirred until completely dissolved, then slowly added 10% by weight aqueous hydrochloric acid solution to adjust pH value is to 4, obtains the aqueous solution that pH value is 4;

[0074] (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 220-255°C, flash point 80°C) mixed in a 1500mL beaker until completely dissolved to obtain an oil solution...

Embodiment 2

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

[0079] (1) At 25°C, mix 100g of acrylamide, 62.5g of methacryloxyethyltrimethylammonium chloride (80% aqueous solution), 5g of poly 2-acrylamido-2-methylpropanesulfonic acid Sodium (molecular weight: 50,000), 0.2g disodium edetate, 0.1g sodium formate and 137.5g deionized water were mixed in a 1000mL beaker, stirred until completely dissolved, and then 10% by weight of hydrochloric acid aqueous solution was slowly added to it to adjust pH value is to 3, obtains the aqueous solution that pH value is 3;

[0080] (2) Mix 10.5g Span-80 and 4.5g Tween-80 to obtain a mixed emulsifier, and calculate the hydrophilic-lipophilic balance value of the mixed emulsifier to be 6, then mix the mixed emulsifier with 150g white oil (boiling point distillation range 240-280°C, flash point 100°C) mixed in a 1500mL beaker until completely dissolved to obtain an o...

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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, a cationic monomer containing a double bond, an anionic 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 3-5; (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 800000, 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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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/10C08F265/02C08F220/56C08F220/34C08F2/32C09K8/68
Inventor 张文龙赵方园祝纶宇刘希林蔚然
Owner CHINA PETROLEUM & CHEM CORP
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