A kind of salt-tolerant structural polymer emulsion and preparation method thereof

A technology of polymer emulsion and salt resistance, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that clear water cannot meet a large amount of fracturing water, cannot meet the use of fracturing sand-carrying fluid, polymer or guanidine The problem of poor salt resistance of glue, etc., to achieve the effect of excellent sand carrying, good salt resistance, and good viscoelasticity

Active Publication Date: 2022-08-09
陕西长海油田助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing fracturing fluid system has high requirements on water quality, and the construction requires the use of clean water as the prepared fracturing fluid. The drought in northern Shaanxi has little water, and clean water cannot meet a large amount of fracturing water. Therefore, a flowback fluid that can be used as a fracturing fluid has been developed. ideas put forward
[0003] The difficulty of reusing flowback fluid as fracturing fluid is that a large amount of formation water is mixed in the flowback process of fracturing fluid, the flowback fluid has a certain degree of salinity, and the salt resistance of conventional polymers or guar gum is poor. The viscosity prepared in the flowback fluid is low, which cannot be used as a sand-carrying fluid for fracturing

Method used

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  • A kind of salt-tolerant structural polymer emulsion and preparation method thereof
  • A kind of salt-tolerant structural polymer emulsion and preparation method thereof
  • A kind of salt-tolerant structural polymer emulsion and preparation method thereof

Examples

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Embodiment 1

[0022] The preparation method of the salt-resistant structural polymer emulsion provided in this embodiment is as follows: in the first jacketed reaction kettle, add 340g of 3# white oil, 15g of Span 60, 40g of Span 80, and 30g of Tween 80, and start stirring to obtain oil. Phase; add 260g of water, 142g of acrylamide, 96g of acrylic acid, 15g of 2-acrylamido-2-methylpropanesulfonic acid, 52g of sodium hydroxide to adjust the pH of the solution to 6.5 in the jacketed reactor two, and control the neutralization temperature to be ≤30 ℃, add potassium persulfate 0.004g, azobisisobutyl cyanide 0.04g to obtain water phase; keep the speed of reaction kettle 1 at 240r / min, slowly pour the monomer aqueous solution in jacket reaction kettle 2 into the oil phase jacket In the first reactor, open nitrogen emulsification and deoxygenation for 30min, and control the temperature of the system at about 15 °C; use a metering pump to dropwise add 0.5% sodium bisulfite solution for polymerizatio...

Embodiment 2

[0025] The preparation method of the salt-resistant structural polymer emulsion provided in this embodiment is as follows: in the first jacketed reaction kettle, add 340g of 3# white oil, 15g of Span 60, 40g of Span 80, and 30g of Tween 80, and start stirring to obtain oil. Phase; add 260g water, 142g acrylamide, 96g acrylic acid, 15g 2-acrylamido-2-methylpropanesulfonic acid, 6g dimethyl diallyl ammonium chloride (DMDAAC), 52g to the second jacketed reactor Sodium hydroxide was used to adjust the pH of the solution to 6.5, and the neutralization temperature was controlled to be less than or equal to 30°C. 0.004 g of potassium persulfate and 0.04 g of azobisisobutyl cyanide were added to obtain an aqueous phase; The monomer aqueous solution in the second reaction kettle was slowly poured into the first oil-phase jacketed reaction kettle, and the nitrogen emulsification and deoxygenation was turned on for 30 minutes, and the temperature of the system was controlled at about 15 °...

Embodiment 3

[0028] The preparation method of the salt-resistant structural polymer emulsion provided in this embodiment is as follows: in the first jacketed reaction kettle, add 340g of 3# white oil, 15g of Span 60, 40g of Span 80, and 30g of Tween 80, and start stirring to obtain oil. Phase; add 260g water, 142g acrylamide, 96g acrylic acid, 15g 2-acrylamido-2-methylpropanesulfonic acid, 10g dodecyl allyl ammonium bromide, 52g sodium hydroxide in jacketed reactor two Adjust the pH of the solution to 6.5, control the neutralization temperature to be less than or equal to 30°C, add 0.004 g of potassium persulfate and 0.04 g of azobisisobutyl cyanide to obtain a water phase; keep the first reaction kettle rotating speed at 240 r / min, put the jacketed reaction kettle two The medium monomer aqueous solution was slowly poured into the oil-phase jacketed reactor 1, and the nitrogen emulsification and deoxygenation was turned on for 30 minutes, and the temperature of the system was controlled to ...

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Abstract

The present invention disclosed a polymer emulsion of salt resistance, including the following components according to the quality percentage: 30-50 % of oil phase, 50-70 % water phase, 3 to 10 % of steering surface active agents;The preparation method of structural polymer emulsion, including the following steps: S1, in the picker reaction kettle one, add emulsification oil, emulsifier and oil -soluble causes, and turn on stirring;Acrylamide, acrylic, 2‑ acrylamide ‑ 2‑ methylopropylasulfonic acid, di methyl axyl axyl azotylexide (DMDAAC), and dulate proprobarium bromide; S3, pour the water phase intoIn the pyramid reaction kettle, stirring is turned on; S4, slowly dripping with a trace injection and reducing dotter solution for polymerization reactions; S5, adding a total mass of 3.0 to 10 % to the emulsion to the emulsion.The advantages of the present invention are that it is suitable for continuous mixed construction on -site, high viscosity maintenance rate, and reuse solution can be reused and saved a large amount of fracture water.

Description

technical field [0001] The invention relates to the technical field of polymer emulsions, in particular to a salt-tolerant structural polymer emulsion and a preparation method thereof. Background technique [0002] At present, the development of tight oil and gas tends to be large-displacement and large-fluid development methods. The purpose is to create more complex fractures, transport support agents to deep formations, and enhance oil and gas conductivity. The existing fracturing fluid system has high water quality requirements, and the construction requires the use of clear water as the fracturing fluid. The northern Shaanxi area is dry and lacks water, and clear water cannot meet a large amount of fracturing water. Therefore, a flowback fluid can be used as the fracturing fluid. ideas proposed. [0003] The difficulty of reusing the flowback fluid as a fracturing fluid is that a large amount of formation water is mixed with the fracturing fluid in the process of gel br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/04C08F226/02C08F2/32C09K8/68C09K8/88
CPCC08F220/56C08F2/32C09K8/68C09K8/882C08F220/06C08F220/585C08F226/04C08F226/02
Inventor 成宝琳文新马少云党志强冯新根
Owner 陕西长海油田助剂有限公司
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