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A kind of drag reducing agent for fracturing 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 expansion, cost reduction effect

Active Publication Date: 2017-09-26
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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  • A kind of drag reducing agent for fracturing and preparation method thereof
  • A kind of drag reducing agent for fracturing and preparation method thereof
  • A kind of drag reducing agent for fracturing 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 resistance reducing agent for fracturing, the method comprising:

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

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

[0032] (3) Contact 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, the water-in-oil emulsion obtained in step (3) is contacted with the initiator in batches, and the polymerization reaction is performed, and then the mixture obtained by the polymerization reaction is contacted with the phase inversion agent;

[0034] Wherein, the hydrophile-lipophile balance of the emulsifier is 4-6, the molecular weight of the anionic pol...

Embodiment 1

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

[0073] (1) Under the condition of 15℃, 100g acrylamide, 43.75g methacryloxyethyl trimethylammonium chloride (80% aqueous solution), 2g 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, and then slowly added 10% by weight aqueous hydrochloric acid to adjust The pH value is 4 to obtain an aqueous solution with a pH value of 4;

[0074] (2) Mix 10.5g Span-80 with 1.5g Tween-80 to obtain a mixed emulsifier. The hydrophilic lipophilic balance of the mixed emulsifier is calculated to be 5, and then the mixed emulsifier and 120g white oil (boiling point distillation range) (220-255℃, flash point 80℃) mixed in a 1500mL beaker until completely dissolved to obtain an oil solution;

[...

Embodiment 2

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

[0079] (1) Under the condition of 25℃, mix 100g acrylamide, 62.5g methacryloxyethyl trimethylammonium chloride (80% aqueous solution), 5g poly-2-acrylamido-2-methylpropanesulfonic acid Sodium (molecular weight is 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 slowly added 10% by weight aqueous hydrochloric acid to adjust The pH value reaches 3, and an aqueous solution with a pH value of 3 is obtained;

[0080] (2) Mix 10.5g Span-80 and 4.5g Tween-80 to obtain a mixed emulsifier. The hydrophilic lipophilic balance of the mixed emulsifier is calculated to be 6, and then the mixed emulsifier and 150g white oil (boiling point distillation range) (240-280℃, flash point 100℃) 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 drag reducing agent for fracturing, comprising: mixing an acrylamide monomer, a cationic monomer containing a double bond, an anionic polymer template, a chelating agent, a molecular weight regulator and water and adjusting the pH value , to obtain an aqueous solution with a pH value of 3-5; the organic solvent is contacted with an emulsifier to obtain an oil solution; the aqueous solution is contacted with the oil solution to obtain a water-in-oil emulsion; under an inert atmosphere, the oil-in- The aqueous emulsion is contacted with the initiator in batches, and a polymerization reaction is carried out, and then the mixture obtained by the polymerization reaction is contacted with a phase inversion agent; wherein, the hydrophilic-lipophilic balance value of the emulsifier is 4-6, and the anionic polymer The molecular weight of the template is less than 800,000, and the structural formula of the anionic polymer template is shown in formula (I), and also relates to a drag reducing agent for fracturing prepared by the above method. The drag-reducing agent for fracturing prepared by the invention has high drag-reducing rate, high clay swelling inhibition, good water solubility and low stratum damage.

Description

Technical field [0001] The invention relates to a resistance reducing agent for fracturing and a preparation method of the resistance reducing agent for fracturing. Background technique [0002] The shale gas reservoir has the characteristics of low porosity and low permeability, and it is difficult to extract. At present, the slick water fracturing technology is mainly used for mining. After the fracturing fluid is pressurized by the high-pressure pump injected into the equipment, it is pumped into the formation at high speed through the pipe string. Under the condition of high pressure and high speed, the turbulence phenomenon is serious in the process of fluid flowing in the pipe. There is a large frictional resistance between the fracturing fluid and the pipe wall. The frictional resistance of the fluid restricts the flow of the fluid in the pipe, resulting in a decrease in the pipeline transportation volume and Energy loss increases. Therefore, it is necessary to add a resi...

Claims

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Application Information

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Patent Type & Authority Patents(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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