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Water-soluble drag reducer as well as preparation method and application thereof

A drag reducing agent and water-soluble technology, applied in the field of drag reducing agent for hydraulic fracturing, can solve problems such as increasing construction cost, and achieve the effects of convenient use, obvious drag reduction effect and good drag reduction effect.

Active Publication Date: 2014-03-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there are not many drag reducers with independent intellectual property rights in China, and the major oil fields mainly use linear rubber and foreign drag reducers, which invisibly increases the construction cost

Method used

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  • Water-soluble drag reducer as well as preparation method and application thereof
  • Water-soluble drag reducer as well as preparation method and application thereof
  • Water-soluble drag reducer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix 3g of emulsifier composed of a mixture of sorbitan fatty acid ester and polysorbate and 40g of mineral spirits composed of xylene, cyclohexane and naphtha, wherein sorbitan fatty acid ester and polysorbate The mass ratio of xylene, cyclohexane and naphtha is 2:1:1. After dissolving evenly, add 5 g of methoxypolyethylene glycol methacrylate, and mix evenly to form an oil phase.

[0013] Dissolve 15g of a mixture of acrylamide, acrylic acid and sodium methacrylsulfonate in 36.7g of water, wherein the mass ratio of acrylamide, acrylic acid and sodium methacrylsulfonate is 5:2:1. After fully dissolving, adjust the pH value of the solution to 8-9 with aqueous sodium hydroxide solution to obtain the aqueous phase.

[0014] Slowly drop the water phase into the oil phase and stir evenly, fully emulsify for 30 minutes under the condition of stirring speed of 1000 rpm, then keep the stirring speed of 300 rpm, and add 0.25g of Potassium persulfate-sodium thiosulfate initiate...

Embodiment 2

[0021] 3g is mixed by the mixture of sorbitan fatty acid ester and polysorbate and 40g is made up of toluene, hexanaphthene and white oil mineral spirits, wherein the mass ratio of sorbitan fatty acid ester and polysorbate is 5: 4. The mass ratio of toluene, cyclohexane and white oil is 1:4:1. After dissolving evenly, add the mixture of 5g octadecyl acrylate and methoxy polyethylene glycol methacrylate, wherein the mass ratio of stearyl acrylate and methoxy polyethylene glycol methacrylate is 1: 1, Mix well to form the oil phase.

[0022] Dissolve 18g of a mixture consisting of dimethylacrylamide, methacrylic acid and 2-acrylamide-2-methylpropanesulfonic acid in 33.7g of water, wherein dimethylacrylamide, methacrylic acid and 2-acrylamide- The mass ratio of 2-methylpropanesulfonic acid is 2:1:1. After fully dissolving, adjust the pH value of the solution to 8-9 with aqueous sodium hydroxide solution to obtain the aqueous phase.

[0023] Slowly drop the water phase into the ...

Embodiment 3

[0030] Mix 5g of a mixture of sorbitan fatty acid ester and alkylphenol polyoxyethylene ether with 40g of solvent naphtha composed of benzene and gasoline, wherein the mass ratio of sorbitan fatty acid ester to alkylphenol polyoxyethylene ether 1:2, the mass ratio of benzene to gasoline is 1:2. After dissolving evenly, add a mixture of 5g methyl acrylate and methoxy polyethylene glycol methacrylate, wherein the mass ratio of methyl acrylate and methoxy polyethylene glycol methacrylate is 4:3 and mix evenly to form oily phase.

[0031] Dissolve 20g of a mixture of methylolacrylamide, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid in 29.5g of water, wherein methylolacrylamide, acrylic acid and 2-acrylamide-2-methyl The mass ratio of propanesulfonic acid is 3:1:1. After fully dissolving, adjust the pH value of the solution to 8-9 with aqueous sodium hydroxide solution to obtain the aqueous phase.

[0032] Slowly drop the water phase into the oil phase and stir evenly...

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Abstract

The invention relates to a water-soluble drag reducer as well as a preparation method and application thereof. The preparation method is characterized by adding an emulsifier and solvent oil to a reactor to form an oil phase, adding a lipophilic propenyl monomer to the oil phase, dissolving a hydrophilic propenyl monomer in water, regulating the pH value to 8-9 to form an aqueous phase, slowly dropping the aqueous phase into the oil phase, carrying out emulsification while stirring, adding an initiator by times under the condition of introducing nitrogen, reacting at 30 DEG C for 48 hours, cooling, adding a polymerization inhibitor so as to obtain an inverse microemulsion system, and mixing the prepared inverse microemulsion system with a surfactant so as to obtain the water-soluble drag reducer. The water-soluble drag reducer is used in quick water fracturing fluid to reduce the friction drag of pipelines, reduces the pump power, improves the sand-carrying capacity of the construction fluid, is suitable for oil and gas exploitation of unconventional low permeability reservoirs, has good dissolving property and obvious drag reduction effect which can reach 50-70% compared with that of the clear water, and is convenient to use.

Description

technical field [0001] The invention belongs to the field of oil field stimulation, in particular to a drag reducer for hydraulic fracturing and its preparation and application. Background technique [0002] Tight unconventional reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most tight oil and gas wells require reservoir reconstruction to obtain ideal production. At present, the most important production stimulation measure for tight unconventional reservoirs at home and abroad is friction reduction fracturing, that is, using low-friction slick water fracturing fluid for volume stimulation. The slick water fracturing fluid system is a new fracturing fluid system developed for the stimulation of tight unconventional reservoirs. In the United States, Canada and other countries, the use of slickwater fracturing fluid has achieved significant economic benefits and has replaced the traditional gel fracturing fluid...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
CPCC08F290/062C09K8/602C09K8/604C09K8/68C09K8/882C09K2208/28E21B43/26C08F220/56C08F220/54C08F220/58
Inventor 范华波李安琪慕立俊赵振峰李宪文张矿生薛小佳吴江刘锦吕海燕周晓群
Owner PETROCHINA CO LTD
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