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On-line blended variable-viscosity resistance-reducing agent for fracturing and preparation method thereof

A drag-reducing agent and variable technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low clay swelling inhibition, low storage stability, poor shear resistance, etc., and achieve clay swelling. High inhibition, good water solubility and good shear resistance

Pending Publication Date: 2020-07-31
北京金圣奥能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are defects such as slow dissolution rate, low drag reduction rate, low storage stability, low clay expansion inhibition, poor shear resistance and high formation damage in the prior art.

Method used

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  • On-line blended variable-viscosity resistance-reducing agent for fracturing and preparation method thereof
  • On-line blended variable-viscosity resistance-reducing agent for fracturing and preparation method thereof
  • On-line blended variable-viscosity resistance-reducing agent for fracturing and preparation method thereof

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preparation example Construction

[0029] A preparation method of online mixing variable viscosity fracturing drag reducing agent, the method comprising:

[0030] a1: mixing acrylamide-based monomers, cationic monomers containing double bonds, anionic polymer templates, chelating agents, molecular weight modifiers and water and adjusting the pH value to obtain an aqueous solution with a pH value of 3-5;

[0031] a2: contacting an organic solvent with an emulsifier to obtain an oil solution;

[0032] a3: contacting the aqueous solution obtained in step a1 with the oil solution obtained in step a2 to obtain a water-in-oil emulsion;

[0033] a4: Under an inert atmosphere, the water-in-oil emulsion obtained in step a3 is contacted with an initiator in batches, and a polymerization reaction is carried out, and then the mixture obtained by the polymerization reaction is contacted with a phase inversion agent, and the proportioning is completed.

[0034] According to the above content, the emulsifier is a nonionic em...

Embodiment 1

[0057] A preparation method of online mixed variable viscosity fracturing drag reducing agent is as follows:

[0058] (1) At 15°C, mix 100g of acrylamide, 43.75g of methacryloyloxyethyltrimethylammonium chloride (80% aqueous solution), 2g of poly 2-acrylamide-2-methylpropanesulfonic acid Sodium (molecular weight: 150,000), 0.1g disodium edetate, 0.05g sodium formate and 111.25g deionized water were mixed in a 1000mL beaker, stirred until completely dissolved, and then slowly added 10 parts by weight of aqueous hydrochloric acid to adjust pH value is to 4, obtains the aqueous solution that pH value is 4;

[0059] (2) 10.5g Span-80 is mixed with 1.5g Tween-80 to obtain a mixed emulsifier, and the hydrophilic-lipophilic balance value of this mixed emulsifier is calculated to be 5, then the mixed emulsifier is mixed with 120g white oil (boiling point distillation range 220-255°C, flash point 80°C) in a 1500mL beaker until completely dissolved to obtain an oil solution;

[0060] ...

Embodiment 2

[0063] A preparation method of online mixed variable viscosity fracturing drag reducing agent is as follows:

[0064] (1) At 25°C, mix 100g of acrylamide, 62.5g of methacryloxyethyltrimethylammonium chloride (80% aqueous solution), 5g of poly 2-acrylamide-2-methylpropanesulfonic acid Sodium (molecular weight is 50,000), 0.2g disodium edetate, 0.1g sodium formate and 137.5g deionized water are mixed in a 1000mL beaker, stirred until completely dissolved, and then 10% by weight of hydrochloric acid aqueous solution is slowly added therein to adjust pH value is to 3, obtains the aqueous solution that pH value is 3;

[0065] (2) 10.5g Span-80 is mixed with 4.5g Tween-80 to obtain a mixed emulsifier, and the hydrophilic-lipophilic balance value of this mixed emulsifier is calculated to be 6, then the mixed emulsifier is mixed with 150g white oil (boiling point distillation range 240-280°C, flash point 100°C) in a 1500mL beaker until completely dissolved to obtain an oil solution; ...

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Abstract

The invention provides an on-line blended variable-viscosity resistance-reducing agent for fracturing and a preparation method thereof. The preparation method comprises following steps: a1, mixing anacrylamide monomer, a cationic monomer containing double bonds, an anionic polymer template, a chelating agent, a molecular weight regulator and water, and adjusting the pH value to obtain a water solution with a pH value of 3-5; a2, contacting an organic solvent with an emulsifier to obtain an oil solution; a3, contacting the water solution obtained in the step a1 with the oil solution obtained in the step a2 to obtain a water-in-oil emulsion; and a4, contacting the water-in-oil emulsion obtained in the step a3 with an initiator in batches in an inert atmosphere, carrying out a polymerizationreaction, and contacting a mixture obtained through the polymerization reaction with a phase inversion agent to complete the proportioning. The prepared on-line blended variable-viscosity resistance-reducing agent is high in resistance reducing rate, high in clay expansion inhibition, good in water solubility, good in shear resistance and low in stratum damage.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to an online mixing variable viscosity fracturing drag reducing agent and a preparation method thereof. Background technique [0002] 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 then pumped into the formation at high speed through the pipe string , under high pressure and high speed conditions, the turbulence phenomenon is serious during the flow of fluid in the pipe, and there is a large frictional resistance between the fracturing fluid and the pipe wall. Energy loss increases. Therefore, it is necessary to add online mixing variable viscosity drag reducing agent to the fluid to reduce the influence of frictional resistance and improve constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F2/32C08F265/10C09K8/68C09K8/88
CPCC08F2/32C08F220/56C08F265/10C09K8/68C09K8/882C09K2208/12C08F220/34
Inventor 冯志强杨波于锋冯赫青于坤
Owner 北京金圣奥能源技术有限公司
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