Degradable drag reducer for fracturing 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 easy shearing and broken chains, loss of drag reducing performance, high molecular polymers that are not easy to degrade, and poor shear resistance and other problems, to achieve the effects of avoiding formation pollution, environmental protection and easy availability of raw materials, and good resistance reduction performance

Active Publication Date: 2016-03-23
张春雨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer drag reducer has less dosage and good performance, but this kind of drag reducer has poor shear resistance, and the stress will easily shear and break the chain and lose the drag reduction performance.
In addition, high molecular polymers are not easy to degrade and cause serious environmental pollution.

Method used

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  • Degradable drag reducer for fracturing and preparation method thereof
  • Degradable drag reducer for fracturing and preparation method thereof
  • Degradable drag reducer for fracturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention is made from the following raw materials in parts by weight: 2% water-soluble polymer, 10% surfactant, 8% organic solvent, 0.1% aldehydes and 79.9% water; the water-soluble polymer is polyacrylamide, The organic solvent is methanol; the aldehyde is formaldehyde; the surfactant is a gemini quaternary ammonium salt type surfactant, and its structure is as follows:

[0027]

[0028] Among them, the synthesis reaction equation is:

[0029] RN(CH 2 CH 2 OH) 2 +BrCH 2 CH 2 Br→(CH 2 CH 2 OH) 2 R 1 N + CH 2 CH 2 N + R 2 (CH 2 CH 2 OH) 2

[0030] In the reaction formula, R is coconut oil base, representing a mixture of C8~C22 alkyl groups, R 1 And R 2 It is C8~C22 long-chain alkyl component, when R 1 And R 2 When the carbon number is the same, a symmetric gemini quaternary ammonium salt surfactant is generated, when R 1 And R 2 When the number of carbons is not the same, asymmetric gemini quaternary ammonium salt surfactants are formed. In the synthesis reaction, ...

Embodiment 2

[0037] The present invention is made from the following raw materials in parts by weight: 3.5% water-soluble polymer, 12.5% ​​surfactant, 9% organic solvent, 0.1% aldehydes and 74.9% water; the water-soluble polymer is polyvinyl alcohol, The organic solvent is ethanol; the aldehyde is glyoxal; the surfactant is a gemini quaternary ammonium salt type surfactant, and its structure is as follows:

[0038]

[0039] Among them, the synthesis reaction equation is:

[0040] RN(CH 2 CH 2 OH) 2 +BrCH 2 CH 2 Br→(CH 2 CH 2 OH) 2 R 1 N + CH 2 CH 2 N + R 2 (CH 2 CH 2 OH) 2

[0041] In the reaction formula, R is coconut oil base, representing a mixture of C8~C22 alkyl groups, R 1 And R 2 It is C8~C22 long-chain alkyl component, when R 1 And R 2 When the carbon number is the same, a symmetric gemini quaternary ammonium salt surfactant is generated, when R 1 And R 2 When the number of carbons is not the same, asymmetric gemini quaternary ammonium salt surfactants are formed. In the synthesis reactio...

Embodiment 3

[0049] The present invention is made from the following raw materials in parts by weight: water-soluble polymer 5%, surfactant 15%, organic solvent 10%, aldehyde 0.1% and water 69.9%; the water-soluble polymer is polyacrylamide and The ratio of polyvinyl alcohol is 1:1, the organic solvent is methanol; the aldehyde is formaldehyde, the ratio of glyoxal is 1:1; the surfactant is a gemini quaternary ammonium salt type surfactant , And its structure is as follows:

[0050]

[0051] Among them, the synthesis reaction equation is:

[0052] RN(CH 2 CH 2 OH) 2 +BrCH 2 CH 2 Br→(CH 2 CH 2 OH) 2 R 1 N + CH 2 CH 2 N + R 2 (CH 2 CH 2 OH) 2

[0053] In the reaction formula, R is coconut oil base, representing a mixture of C8~C22 alkyl groups, R 1 And R 2 It is C8~C22 long-chain alkyl component, when R 1 And R 2 When the carbon number is the same, a symmetric gemini quaternary ammonium salt surfactant is generated, when R 1 And R 2 When the number of carbons is not the same, asymmetric gemini qua...

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Abstract

The invention belongs to the technical field of fracturing fluid additives for increasing production in oil and gas fields, and specifically relates to a degradable drag reducer for fracture and a preparation method thereof. The drag reducer is prepared from the following raw materials in percentage by weight: 2-5% of a water-soluble polymer, 10-15% of a surfactant, 8-10% of organic solvent, 0.1% of aldehydes and the balance of water. The water-soluble polymer is polyacrylamide, polyvinyl alcohol or any one of a mixture of polyacrylamide and polyvinyl alcohol in proportion ranged from 1:1 to 1:2. The organic solvent is any one of methanol or ethanol. The aldehyde is formaldehyde, oxalaldehyde or any one of a mixture of formaldehyde and oxalaldehyde in proportion ranging from 1:1 to 1:2. The drag reducer has the advantages that the drag reducer is good in resistance dimishing performance and heat stability; after fracturing construction, the residual drag reducer in the well can be degraded by microorganisms; the pollution to the stratum is avoided.

Description

Technical field [0001] The invention belongs to the technical field of fracturing fluid additives for increasing production in oil and gas fields, and specifically relates to a degradable drag reducer for fracturing and a preparation method thereof. Background technique [0002] Acid fracturing is the main way to increase production in oil and gas fields. The proportion of additives in the fracturing fluid components in the fracturing fluid is very small, less than 1% of the total fracturing fluid, but it is very important for increasing the production of oil and gas wells. of. When a large amount of liquid is driven into the ground, reducing the frictional resistance of the liquid is a top priority. The function of the drag reducer is to reduce the friction coefficient when the fracturing fluid flows, thereby reducing the construction pressure. The most commonly used water-soluble drag reducers are polyacrylamide or other compounds of polyacrylamide, synthetic polyethylene oxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/725C09K8/74
Inventor 张玄张鹏张聪忠张莉
Owner 张春雨
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