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Drag reducer and preparation method thereof

A technology of drag reducer and solvent, which is applied in the field of drag reducer and the preparation of the drag reducer, which can solve the problems of single effect of drag reducer, difficulty in achieving drag reduction effect, poor shear resistance, etc., and achieve good shale suppression The effects of high resistance, good salt resistance, and good shear resistance

Active Publication Date: 2022-01-04
新疆兰德伟业油田服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned drag reducer, due to the characteristics of the polymer drag reducer itself, has poor shear resistance and a fast degradation rate in the formation, and it is difficult to achieve the desired drag reduction effect in the follow-up process. The effect of the above drag reducer is single

Method used

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  • Drag reducer and preparation method thereof
  • Drag reducer and preparation method thereof

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preparation example Construction

[0026] A preparation method of drag reducer, comprising the following steps:

[0027] Take 1 mole part of polyethylene polyamine and dissolve it in the first solvent, and take another 1 mole part of unsaturated quaternary ammonium salt and dissolve it in the second solvent. Add the quaternary ammonium salt solution dropwise to the polyethylene polyamine solution. After the dropwise addition, maintain the above conditions and continue the reaction for 2-4 hours. After the reaction is completed, G1 can be obtained by purification;

[0028] Take 1 mole part of G1 and dissolve it in the first solvent, and take another 1 mole part of unsaturated quaternary ammonium salt and dissolve it in the second solvent, repeat the above steps, and the number of repetitions is m-2 or m-1, wherein, m is polyvinyl The number of hydrogen atoms on the amino group in the polyamine is the branched quaternary ammonium salt G; in this step and the previous step, the unsaturated quaternary ammonium salt...

Embodiment 1

[0046] Preparation of branched quaternary ammonium salt monomer: take equimolar parts of triethylenetetramine and trimethylvinyl ammonium bromide respectively dissolved in acetone, under 70°C, nitrogen atmosphere and continuous stirring, trimethyl Vinyl ammonium bromide solution was added dropwise to triethylenetetramine solution. After the dropwise addition was completed, the aforementioned conditions were maintained for 3 hours of continuous reaction. After the reaction was completed, S1- G1;

[0047] Get S1-G1 and trimethylvinyl ammonium bromide of equimolar amount, repeat above-mentioned steps altogether 5 times, finally make branched quaternary ammonium salt S1-G; Times" means, including the initial step and subsequent repeated steps, a total of 5 times.

[0048] Take equimolar parts of S1-G and acryloyl chloride and dissolve them in tetrahydrofuran respectively. Under the condition of ice bath, blow nitrogen gas and keep stirring, add N,N-diisopropylethylamine to the S1...

Embodiment 2

[0051] Preparation of branched quaternary ammonium salt monomer: take equimolar parts of diethylenetriamine and trimethylvinylammonium bromide and dissolve them in acetone respectively. Vinyl ammonium bromide solution was added dropwise to diethylenetriamine solution. After the dropwise addition was completed, the aforementioned conditions were maintained for 3 hours of continuous reaction. After the reaction was completed, S2- G1;

[0052] Get S2-G1 and trimethylvinyl ammonium bromide of equimolar amount, repeat above-mentioned steps altogether 4 times, finally make branched quaternary ammonium salt S2-G; Times" means, including the initial step and subsequent repeated steps, a total of 4 times.

[0053] Take equimolar parts of S2-G and acryloyl chloride and dissolve them in tetrahydrofuran respectively. Under the condition of ice bath, blow nitrogen gas and keep stirring, add N,N-diisopropylethylamine to the S2-G solution, where N , the molar ratio of N-diisopropylethylami...

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Abstract

The invention discloses a drag reducer and a preparation method thereof.The method comprises the following steps: firstly, preparing branched quaternary ammonium salt from polyethylene polyamine and unsaturated quaternary ammonium salt, then blocking the branched quaternary ammonium salt with unsaturated acyl chloride to obtain a branched quaternary ammonium salt monomer, and finally, carrying out copolymerization on an acrylamide monomer, an acrylic acid monomer, an unsaturated polyoxyethylene ether monomer and the branched quaternary ammonium salt monomer to obtain a drag reducer. The drag reducer disclosed by the invention has a relatively good drag reduction rate in both clear water and saline water, the drag reduction rate can reach 76% or above under the condition that the addition amount is 0.1%, and the drag reduction rate can still reach 74% or above even under the condition that the salt content is 5%, so that the drag reducer disclosed by the invention has relatively good salt resistance; and meanwhile, the drag reduction rate of the drag reducer can still reach 70% or above even under the long-time shearing condition, which indicates that the drag reducer has good shear resistance.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid additives, in particular to a drag reducer and a preparation method of the drag reducer. Background technique [0002] With the increase of domestic drilling efforts, most of the shallow oil / gas reservoirs have reached the late stage of production or even been exploited. Therefore, there are more and more deep wells and ultra-deep wells. During the fracturing process, due to the high friction of the fracturing fluid , the pressure loss is large, especially for ultra-deep wells, the pressure has exceeded the limit of the existing ground fracturing equipment. [0003] Therefore, drag reducers are usually added to the fracturing fluid at home and abroad to reduce the friction of the fracturing fluid at night and reduce the pressure loss during the fracturing process. Drag reducers are usually divided into polymer drag reducers, surfactant drag reducers, and nanoparticle drag reducers. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/02C08F220/28C09K8/68C09K8/88
CPCC08F220/56C09K8/68C09K8/88C08F220/06C08F226/02C08F220/286
Inventor 姜学海初京义魏三林张世锋刘国银叶楠
Owner 新疆兰德伟业油田服务有限公司
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