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, and high formation damage, and achieve the Swelling suppression, resistance reduction performance improvement, and low production cost effects

Active Publication Date: 2015-10-14
CHINA PETROLEUM & CHEM CORP +1
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  • 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 monomer, double bond-containing hydroxyl nonionic monomer, polyhydroxy nonionic polymer template, dispersant, molecular weight regulator, inorganic salt and water to obtain an aqueous solution;

[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 polyhydroxy nonionic polymer template is less than 500,000, and the structural formula of the polyhydroxy nonionic polymer template is shown in formula (I) or formula (II):

[0031]

[0032] A is O or NH;

[0033] R 1 is hydrogen or methyl;

[0034] R 2 is C 1 -C 12 Alkylene or isoalkylene.

[0035] According to the method of the present invention, as long as the polyhydroxy nonionic polymer template with a stru...

Embodiment 1

[0058] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0059] (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 , and then add 4.0g polyvinyl alcohol (model: 10-98, the molecular weight is 61,000), stir until completely dissolved, then add 100g of acrylamide, 20g of 2-hydroxyethyl methacrylate, 8g of polyethylene oxide (molecular weight of 500,000), 0.5g of sodium formate, and stir until Completely dissolved to obtain an aqueous solution;

[0060] (2) At 16°C, first add 10g of 2% by weight of ammonium persulfate aqueous solution to the aqueous solution obtained in step (1), and then add 5g of 2% by weight of sodium bisulfite aqueous solution to it in 5 times, each time The amount of addition is 1...

Embodiment 2

[0062] This example is used to illustrate the drag reducing agent for fracturing of the present invention and its preparation method.

[0063] (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 5g polyvinyl alcohol (model: 40-88, the molecular weight is 205,000), stir until completely dissolved, then add 100g acrylamide, 5g 2-hydroxyethyl methacrylate, 5g poly 2-acrylamido-2-methylpropanesulfonate (molecular weight 500,000), 0.1g of sodium formate, stirred until completely dissolved to obtain an aqueous solution;

[0064] (2) At 21°C, first add 5g of 2% by weight of ammonium persulfate aqueous solution to the aqueous solution obtained in step (1), and then add 2.5g of 2% by weight of sodium bisulfite aqueous solution to it in 5 times, each time The amount of addit...

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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 nonionic-series monomer having a hydroxyl group and containing a double bond, a polyhydroxyl nonionic polymer template, a dispersing agent, a molecular weight regulating agent and inorganic salts with water to obtain a water solution; 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 polyhydroxyl nonionic polymer template is less than 500000, and the structure formula of the polyhydroxyl nonionic polymer template is represented as the formula (I) or the formula (II). 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): C08F261/04C08F265/04C08F265/10C08F220/56C08F220/28C08F220/58C09K8/68
Inventor 张文龙伊卓林蔚然方昭杜超
Owner CHINA PETROLEUM & CHEM CORP
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