Resistance reducing agent for fracture and preparation method thereof

A drag-reducing agent and fracturing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low clay expansion inhibition, low drag-reducing rate of drag-reducing agent, low storage stability, etc., to achieve Effects of clay expansion inhibition, improvement of drag reduction performance, and safe storage and transportation

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 low drag reduction rate, low storage stability, low clay expansion inhibition, poor shear resistance and high formation damage of the drag reducer in the prior art, and to provide a drag reducer for fracturing. Preparation method of resistance agent, 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

[0027] In one aspect, the present invention provides a method for preparing a drag reducing agent for fracturing, the method comprising:

[0028] (1) Mix acrylamide-based monomers, cationic monomers containing double bonds, anionic polymer templates, dispersants, molecular weight modifiers, inorganic salts and water and adjust the pH value to obtain an aqueous solution with a pH value of 3-6;

[0029] (2) Under an inert atmosphere, contact the aqueous solution obtained in step (1) with an initiator in batches, and carry out a polymerization reaction;

[0030] Wherein, the molecular weight of the anionic polymer template is less than 800,000, and the structural formula of the anionic polymer template is shown in formula (I):

[0031]

[0032] R is hydrogen or methyl;

[0033] A is O or NH;

[0034] Z is OM or Wherein, M is Na, K, NH4.

[0035] According to the method of the present invention, as long as the anionic polymer template with a structural formula as shown in ...

Embodiment 1

[0059] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0060] (1) At 15°C, add 523.3g of deionized water into a 1000mL polymerization reactor equipped with a condenser, thermometer, nitrogen inlet and agitator, then add 250g of ammonium sulfate into the polymerization reactor, and stir until completely dissolved Finally, add 3.75g of sodium polyacrylate (molecular weight: 150,000) to the polymerization reactor, stir until completely dissolved, then add 100g of acrylamide, 18g of methacryloyloxyethyltrimethylammonium chloride, 8g After polymethacryloyloxyethyltrimethylammonium chloride (molecular weight: 500,000), 0.5g of sodium formate, stir until completely dissolved, and finally add 1% by weight of HCl aqueous solution slowly to the solution obtained above, and adjust the pH to 6. Obtaining an aqueous solution with a pH of 6;

[0061] (2) At 16°C, first add 10g of 2% by weight of ammonium persu...

Embodiment 2

[0063] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0064] (1) At a constant temperature of 20°C, add 536.9g of deionized water into a 1000mL polymerization reactor equipped with a condenser, thermometer, nitrogen inlet and stirrer, then add 297g of ammonium sulfate into the polymerization reactor, and stir until completely dissolved , and then add 5g of sodium polyacrylate (molecular weight: 50,000) to the polymerization reactor, stir until completely dissolved, then add 100g of acrylamide, 20g of methacryloxyethyltrimethylammonium chloride, 5g of polyform Acryloyloxyethyltrimethylammonium chloride (molecular weight: 500,000), 0.1g of sodium formate, stirred until completely dissolved, and finally slowly added 1% by weight of HCl aqueous solution to the solution obtained above to adjust the pH to 5, An aqueous solution with a pH of 5 is obtained;

[0065] (2) At a constant temperature of 21°C...

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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 dispersing agent, a molecular weight regulating agent and inorganic salts with water with pH value being regulated to obtain a water solution of which the pH value is 3-6; and (2) under an inert atmosphere, contacting the water solution with an initiator in batches and performing a polymerization reaction. 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 low in formation damage property, is high in inhibition on clay expansion, is good in water solubility and is green and environment-friendly.

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] Hydraulic fracturing of oil and gas layers, referred to as fracturing, is a technology developed in the 1940s to modify the seepage characteristics of oil and gas layers, and is an important technological measure for increasing production of oil and gas wells and increasing injection of water injection wells. Fracturing fluid is an important medium in the fracturing process. Commonly used fracturing fluids include water-based fracturing fluid, oil-based fracturing fluid, emulsified fracturing fluid, and foam fracturing fluid. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C09K8/68
Inventor 张文龙林蔚然伊卓杜超方昭
Owner CHINA PETROLEUM & CHEM CORP
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