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Salt-tolerant structural polymer emulsion and preparation method thereof

A technology of polymer emulsion and salt resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that clear water cannot satisfy a large amount of fracturing water, polymer or guar gum has poor salt resistance, and cannot meet pressure requirements. The use of cracking sand-carrying fluid and other problems can be achieved to achieve excellent sand-carrying properties, good salt resistance, and good viscoelasticity

Active Publication Date: 2020-10-13
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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  • Salt-tolerant structural polymer emulsion and preparation method thereof
  • Salt-tolerant structural polymer emulsion and preparation method thereof
  • Salt-tolerant structural polymer emulsion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of the salt-tolerant structural polymer emulsion provided in this example is: in the jacketed reactor one, add 340g of 3# white oil, 15g of Span 60, 40g of Span 80, and 30g of Tween 80, and start stirring to obtain the oil Phase; add 260g water, 142g acrylamide, 96g acrylic acid, 15g 2-acrylamido-2-methylpropanesulfonic acid, 52g sodium hydroxide to adjust the pH of the solution to 6.5, and control the neutralization temperature to ≤30 ℃, add 0.004g of potassium persulfate and 0.04g of azobisisobutylcyanide to obtain the water phase; keep the speed of reaction kettle 1 at 240r / min, and slowly pour the monomer aqueous solution in jacketed reaction kettle 2 into the oil phase jacket In reaction kettle 1, turn on nitrogen emulsification and deoxygenation for 30 minutes, control the system temperature at about 15°C; use a metering pump to add 0.5% sodium bisulfite solution dropwise for polymerization, control the system temperature at 40°C to 50°C, unt...

Embodiment 2

[0029] The preparation method of the salt-tolerant structural polymer emulsion provided in this example is: in the jacketed reactor one, add 340g of 3# white oil, 15g of Span 60, 40g of Span 80, and 30g of Tween 80, and start stirring to obtain the oil Phase; add 260g water, 142g acrylamide, 96g acrylic acid, 15g 2-acrylamido-2-methylpropanesulfonic acid, 6g dimethyl diallyl ammonium chloride (DMDAAC), 52g in jacketed reactor two Adjust the pH of the solution to 6.5 with sodium hydroxide, control the neutralization temperature to ≤30°C, add 0.004 g of potassium persulfate and 0.04 g of azobisisobutyrocyanide to obtain the water phase; Slowly pour the monomer aqueous solution in the reaction kettle 2 into the oil-phase jacketed reaction kettle 1, turn on the nitrogen emulsification and deoxygenation for 30 minutes, and control the temperature of the system at about 15°C; use a metering pump to add 0.5% sodium bisulfite solution dropwise for polymerization, Control the temperatu...

Embodiment 3

[0032]The preparation method of the salt-tolerant structural polymer emulsion provided in this example is: in the jacketed reactor one, add 340g of 3# white oil, 15g of Span 60, 40g of Span 80, and 30g of Tween 80, and start stirring to obtain the 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 ≤30°C, add 0.004g of potassium persulfate and 0.04g of azobisisobutyrocyanide to obtain the water phase; keep the speed of reaction kettle 1 at 240r / min, and put the jacketed reaction kettle 2 Slowly pour the aqueous monomer aqueous solution into the oil-phase jacketed reactor 1, turn on the nitrogen emulsification and deoxygenation for 30 minutes, and control the temperature of the system at about 15°C; The temperature is 40℃~50℃, and the reaction is completed until t...

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Abstract

The invention discloses a salt-tolerant structural polymer emulsion which comprises the following components in percentage by mass: 30-50% of an oil phase, 50-70% of a water phase and 3-10% of a steering surfactant. A preparation method of the salt-tolerant structural polymer emulsion comprises the following steps: S1, adding emulsified oil, an emulsifier and an oil-soluble initiator into a jacketed reaction kettle I, and starting stirring; S2, adding water, acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl diallyl ammonium chloride (DMDAAC) and dodecyl allyl ammonium bromide into a jacketed reaction kettle II; S3, pouring the water phase into the jacketed reaction kettle I, and starting stirring; S4, slowly dropwise adding a reductive initiator solution by using a micro-injector to perform polymerization reaction; and S5, adding a steering surfactant accounting for 3.0-10% of the total mass into the emulsion. The salt-tolerant structural polymer emulsion provided by the invention has the advantages that the salt-tolerant structural polymer emulsion is suitable for on-site continuous mixing type construction and has a relatively high viscosity retentionrate, the flow-back liquid can be repeatedly used, and a large amount of fracturing water is saved.

Description

technical field [0001] The invention relates to the technical field of polymer emulsions, in particular to a polymer emulsion with a salt-tolerant structure and a preparation method thereof. Background technique [0002] At present, tight oil and gas development tends to be developed with large displacement and large liquid volume. The purpose is to create more complex fractures, transport support agents to far-reaching formations, and enhance oil and gas flow conductivity. 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. idea proposed. [0003] The difficulty of reusing flowback fluid as fracturing fluid is that a large amount of formation water is mixed in the f...

Claims

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Application Information

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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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