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Surfactant fracturing fluid capable of recycling and preparation method

A surfactant and fracturing fluid technology, which is applied in the field of oilfield fracturing fluid, can solve problems such as difficult flowback fluid treatment, complex system composition, and poor temperature resistance, and achieve water and additive saving, cost reduction, and simple formula Effect

Inactive Publication Date: 2018-03-23
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a reusable surfactant-based fracturing fluid and its preparation method to solve the problems of complex system composition, high cost, poor temperature resistance, and difficult treatment of flowback fluid in the prior art.

Method used

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  • Surfactant fracturing fluid capable of recycling and preparation method
  • Surfactant fracturing fluid capable of recycling and preparation method
  • Surfactant fracturing fluid capable of recycling and preparation method

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preparation example Construction

[0018] The preparation method of the reusable surfactant type fracturing fluid of the present invention comprises the following steps:

[0019] (1) Mix organic acid and N,N-dimethyl-1,3-propanediamine compound evenly, heat to 150-180°C for 4-6 hours, cool to room temperature, and react to obtain an intermediate;

[0020] (2) Mix the intermediate and the dihalide evenly in an aqueous ethanol solution, stir and heat up to 60-90°C, react for 3-5 hours, and cool to room temperature to obtain a surfactant;

[0021] (3) According to mass percentage, add 2%-4% surfactant and 1%-3% halide aqueous solution into water and stir evenly to obtain surfactant fracturing fluid;

[0022] Organic acid: N,N-dimethyl-1,3-propanediamine: the molar ratio of dihalide: 1:(1.05-1.10):(0.45-0.48); the amount of ethanol aqueous solution is the total amount of reactants 8-10% of the mass.

[0023] The organic acid is C18-C20, C24 long chain unsaturated fatty acid.

[0024] The dihalide is X(CH 2 ) n...

Embodiment 1

[0030] Feeding molar ratio: linolenic acid: N,N-dimethyl-1,3-propylenediamine: dihalide = 1:1.05:0.45; ethanol aqueous solution (mass percentage concentration 50%, the same below) is added as the reactant 8% of the total mass.

[0031] After mixing linolenic acid and N,N-dimethyl-1,3-propanediamine compound evenly, heating to 150°C for 4 hours, cooling to room temperature, and reacting to obtain an intermediate. The intermediate and 1,2-dichloroethane were uniformly mixed in an aqueous ethanol solution (50%), stirred and heated to 70°C, reacted for 4 hours, cooled to room temperature, and a surfactant was obtained. 2% surfactant and 1% potassium chloride aqueous solution (20%) are sequentially added into water and stirred evenly to obtain surfactant fracturing fluid.

Embodiment 2

[0033] Feeding molar ratio: eicosenoic acid: N, N-dimethyl-1,3-propanediamine: dihalide = 1:1.08:0.47; the amount of ethanol aqueous solution (50%) is 10% of the total mass of reactants %.

[0034] After mixing eicosenoic acid and N,N-dimethyl-1,3-propanediamine compound evenly, heat to 160°C for 5 hours, cool to room temperature, and react to obtain an intermediate. The intermediate and 1,2-dichloropropane were uniformly mixed in an aqueous ethanol solution (50%), stirred and heated to 80°C, reacted for 4 hours, and cooled to room temperature to obtain a surfactant. 3% surfactant and 2% ammonium chloride aqueous solution (20%) are sequentially added into water and stirred evenly to obtain surfactant fracturing fluid.

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Abstract

The invention discloses a preparation method of a surfactant fracturing fluid capable of recycling. The preparation method comprises the following steps: after uniformly mixing organic acid with N,N-dimethyl-1,3-propane diamine compound, heating to 150 to 180 DEG C for carrying out a reaction for 4 to 6 hours, cooling to room temperature, and carrying out a reaction to obtain an intermediate; uniformly mixing the intermediate with a dihalide in an ethanol water solution, stirring and warming to 60 to 90 DEG C, carrying out a reaction for 3 to 5 hours, and cooling to room temperature to obtaina surfactant; adding 2% to 4% of the surfactant and 1% to 3% of a dihalide water solution into water in sequence in percentage by weight for uniform stirring so as to obtain the surfactant fracturingfluid. The surfactant fracturing fluid is simple in formula and high in temperature resistance and shearing resistance, a chemical gel breaker does not need to be added, gel can be broken when suffering from oil or water, the surfactant fracturing fluid is high in flowback capacity and free of residue, clay can be effectively stabilized, the formation damage is low, a flowback fluid can be recycled through simple treatment, a large quantity of water and additives can be saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing fluid, in particular to a reusable surfactant fracturing fluid and a preparation method thereof. Background technique [0002] Fracturing fluid is an important part and key link of fracturing reconstruction, and plays a very important role in oil extraction. Currently commonly used water-based plant gum fracturing fluids have the disadvantages of high fracturing fluid gel-breaking residue, low flowback rate, and great damage to the formation, which leads to a decrease in the permeability of fractures and formations and affects the effect of fracturing. [0003] Surfactant-based clean fracturing fluid has the advantages of no residue, easy gel breaking, good flowback performance, and little damage to the formation, and can effectively solve the problem of conventional water-based fracturing fluids due to incomplete gel breaking during the flowback process. More and more people pay more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/38C07C231/02C07C231/12C09K8/68C09K8/60C09K8/86
Inventor 李伟王红科牛增前马洪芬赵鹏靳剑霞王越徐昊垠徐瑞国张荣港吴浩
Owner CNPC BOHAI DRILLING ENG
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