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A drag reducing agent for fracturing and its preparation method

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 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: 2017-11-07
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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  • A drag reducing agent for fracturing and its preparation method
  • A drag reducing agent for fracturing and its preparation method
  • A drag reducing agent for fracturing and its preparation method

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 drag reducing agent for fracturing, which comprises: (1) dispersing an acrylamide monomer, a hydroxyl nonionic monomer containing a double bond, a polyhydroxy nonionic polymer template, and agent, molecular weight regulator, inorganic salt and water to obtain an aqueous solution; (2) under an inert atmosphere, contact the aqueous solution obtained in step (1) with an initiator, and carry out a polymerization reaction; wherein, the polyhydroxy nonionic polymerization The molecular weight of the 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). The present invention also relates to a drag reducing agent for fracturing prepared by the above method. The drag reducing agent synthesized by the preparation method of the invention has the advantages of high drag reducing rate, low formation damage, high clay expansion inhibition, good water solubility, environmental protection and the like.

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 Patents(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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