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 swelling inhibition, low resistance-reducing rate of drag-reducing agent, poor shear resistance, etc. To achieve the effect of clay swelling inhibition, resistance reduction performance improvement, non-flammability and explosion resistance

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

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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

[0031] In one aspect, the present invention provides a method for preparing a drag reducing agent for fracturing, the method comprising:

[0032] (1) Mix acrylamide-based monomers, anionic monomers containing double bonds, cationic polymer templates, dispersants, molecular weight regulators, inorganic salts and water and adjust the pH value to obtain an aqueous solution with a pH value of 4-7;

[0033] (2) Under an inert atmosphere, contact the aqueous solution obtained in step (1) with an initiator in batches, and carry out a polymerization reaction;

[0034] Wherein, the molecular weight of the cationic polymer template is less than 1 million, and the structural formula of the cationic polymer template is shown in formula (I):

[0035]

[0036] R 1 is hydrogen or methyl;

[0037] A is O or NH;

[0038] R 2 is C 1 -C 6 the alkylene group;

[0039] R 3 , R 4 , R 5 is C 1 -C 6 the alkyl group;

[0040] Z is chlorine, bromine or iodine.

[0041] According to the...

Embodiment 1

[0065] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0066] (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 Then, add 4.0g of polymethacryloyloxyethyltrimethylammonium chloride (molecular weight: 200,000) to the polymerization reactor, stir until completely dissolved, then add 100g of acrylamide, 30g of sodium acrylate, After 8g of sodium polyacrylate (molecular weight is 500,000), 0.5g of sodium formate, stir until completely dissolved, and finally slowly add 1% by weight of NaOH aqueous solution to the solution obtained above, adjust the pH to 5, and obtain an aqueous solution with a pH of 5;

[0067] (2) At 16°C, first add 10g of 2% by weight of ammonium persulfate aqueous solution to the aqu...

Embodiment 2

[0069] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0070] (1) At 20°C, add 536.9g of deionized water to a 1000mL polymerization reactor equipped with a condenser, thermometer, nitrogen inlet and agitator, then add 297g of ammonium sulfate into the polymerization reactor, and stir until completely dissolved , and then add 5.0g polymethacryloxyethyltrimethylammonium chloride (molecular weight: 10,000) to the polymerization reactor, stir until completely dissolved, then add 100g acrylamide, 30g sodium acrylate, 5g2- After sodium acrylamido-2-methylpropanesulfonate and 0.1 g of sodium formate, stir until completely dissolved, and finally add 1% by weight of NaOH aqueous solution slowly to the solution obtained above, adjust the pH to 7, and obtain an aqueous solution with a pH of 7 ;

[0071] (2) At 21°C, first add 5g of 2% by weight of ammonium persulfate aqueous solution to the aqueous solution...

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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 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 4-7; 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 cationic polymer template is less than 1000000, and the structure formula of the cationic 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): C08F220/56C08F220/06C08F220/58C09K8/68
Inventor 张文龙黄凤兴伊卓赵方园刘希
Owner CHINA PETROLEUM & CHEM CORP
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