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Drag reducer for fracturing and preparation method thereof

A drag reducing agent and fracturing technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problem of poor salt resistance, temperature resistance and shear resistance of fracturing fluid drag reducing agents, and narrow application range. , strong specificity and other issues, to achieve the effects of good stability, fast dissolution and wide application range

Inactive Publication Date: 2020-08-07
SHAANXI YUTENG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in drag reducers for fracturing at present. The main reason is that drag reducers, drainage aids, clay stabilizers, surfactants, fungicides, etc. need to be added to the system, which is complicated to use and inconvenient to operate. And strong specificity, narrow scope of application
In addition, the salt resistance, temperature resistance and shear resistance of the fracturing fluid drag reducer are poor
Not suitable for high temperature and low permeability reservoir applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] A preparation method of a drag reducer for fracturing, comprising the following steps:

[0029] Step 1, dissolving water-soluble monomers and electrolytes with salting-out effect in water, stirring until uniformly mixed to form an aqueous phase solution;

[0030] Step 2, dissolving the compounded emulsifier in the base oil and stirring until mixed evenly to form an oil phase solution;

[0031] Step 3, add the prepared oil phase solution in the four-necked round-bottomed flask, simultaneously feed nitrogen, water-bath heating and pass through the four-necked round-bottomed flask. 2 Under the condition of air, after exhausting the air, use the dropping funnel to slowly add the water phase to the round-bottomed flask to obtain a transparent and stable inverse microemulsion, and continue to pass nitrogen into the four-necked round-bottomed flask; After rising to the predetermined temperature, the round bottom flask is placed in a water bath, and an initiator is added. Afte...

Embodiment 1

[0036] The anti-phase microemulsion polymerization method of the present invention prepares the drag reducer for fracturing, in terms of mass fraction, including water-soluble monomer: 12%, water 31%, base oil: 50.45% , Emulsifier: 5%, Initiator: 0.05%, Electrolyte with salting-out effect: 1.5%.

[0037] The preparation method of the above-mentioned compound scale and corrosion inhibitor comprises the following steps:

[0038]Step 1. Dissolve 6g of acrylamide, 6g of acrylic acid, and 1.5g of an electrolyte having a salting-out effect into sodium chloride in water, and stir until they are uniformly mixed to form an aqueous phase solution;

[0039] Step 2. Mix 3g of emulsifier Span80 and 2g of Tween60 and dissolve them in 50.45g of cyclohexane base oil and stir until they are evenly mixed to form an oil phase solution;

[0040] Step 3. Add the prepared oil phase solution into a four-necked round-bottomed flask. At the same time, the four-necked round-bottomed flask is supplied ...

Embodiment 2

[0043] The anti-phase microemulsion polymerization method of the present invention prepares the drag reducer for fracturing, in terms of mass fraction, including water-soluble monomer: 12%, water 31%, base oil: 50.40% , Emulsifier: 5%, Initiator: 0.1%, Electrolyte with salting-out effect: 1.5%.

[0044] The preparation method of the above-mentioned compound scale and corrosion inhibitor comprises the following steps:

[0045] Step 1. Dissolve 6g of acrylamide, 6g of acrylic acid, and 1.5g of an electrolyte having a salting-out effect in water, and stir until the water-soluble monomer is uniformly mixed to form an aqueous phase solution;

[0046] Step 2. Mix 3.5g of emulsifier Span80 and 1.5g of Tween60 and dissolve them in 50.45g of liquid paraffin base oil and stir until they are evenly mixed to form an oil phase solution;

[0047] Step 3. Add the prepared oil phase solution into a four-necked round-bottomed flask. At the same time, the four-necked round-bottomed flask is su...

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Abstract

The invention discloses a drag reducer for fracturing and a preparation method thereof. The drag reducer for fracturing consists of, in percentage by mass, 10%-30% of a water-soluble monomer, 5%-35% of water, 30%-65% of base oil, 5%-30% of an emulsifier, 1%-3% of an electrolyte with a salting-out effect and 0.001%-0.1% of an initiator. Under the initiation of the initiator, a water-in-oil system formed by an aqueous phase solution and an oil phase solution is subjected to a reversed-phase microemulsion polymerization reaction. According to the invention, the drag reducer for a fracturing fluidis synthesized by adopting a reversed-phase emulsion polymerization mode; the fracturing fluid is a water-soluble polymer with a small amount of hydrophobic groups on a hydrophilic macromolecular chain, and the solution has special thickening and shearing-resistant effects due to the specific amphiphilic molecular structure of the fracturing fluid; and the drag reducer has the advantages of highdrag reduction rate, strong compatibility, shearing resistance, low friction resistance, low damage and wide application range.

Description

technical field [0001] The invention relates to the technical field of oil and gas field engineering chemical agent production stimulation, in particular to a drag reducer for fracturing and a preparation method thereof. Background technique [0002] With social progress and rapid economic development, oil and gas engineering occupies a considerable proportion in modern industry and life. Unconventional oil and gas resources are highly valued at home and abroad, and the exploitation of shale gas and tight oil has become the top priority in oil and gas field exploitation. Therefore, increasing the exploration and development of shale gas resources is conducive to changing the pattern of oil and gas resources in my country and alleviating the shortage of oil and gas resources. Shale reservoirs have the characteristics of low porosity and low permeability, low reservoir permeability, high shale content, generally 20% to 70%, and difficult exploration and development. Most shal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F2/32C08F220/34C09K8/64C09K8/68
CPCC08F2/32C08F220/56C09K8/64C09K8/68C09K2208/28C08F220/06C08F220/34
Inventor 陈力群韩跃旺朱祺东
Owner SHAANXI YUTENG IND
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