Acrylamide/sodium acrylate multi-component copolymer, method for preparing same and emulsion water-based fracturing fluid drag reducer

A technology of multi-component copolymer and acrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that cannot meet the requirements of use, and achieve the effects of easy twisting and rotation, excellent drag reduction performance, and reduced formation damage

Active Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brine drag reducer has good salt resistance and good temperature resistance, and is easy to synthesize; however, its drag reduction rate is ...

Method used

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  • Acrylamide/sodium acrylate multi-component copolymer, method for preparing same and emulsion water-based fracturing fluid drag reducer
  • Acrylamide/sodium acrylate multi-component copolymer, method for preparing same and emulsion water-based fracturing fluid drag reducer
  • Acrylamide/sodium acrylate multi-component copolymer, method for preparing same and emulsion water-based fracturing fluid drag reducer

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] The preparation method of the acrylamide / sodium acrylate multi-polymer of embodiment comprises the following steps:

[0053] 1) In a jacketed closed reactor, add an organic solvent and an emulsifier, start the agitator for mixing, and pass nitrogen gas for 10 minutes to obtain an oil phase;

[0054] Add the reaction monomer acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and diallyl polyether into water to make an aqueous solution, and use a 30% sodium hydroxide solution to adjust the pH of the system to 7.0 to 7.5, pass nitrogen gas for 20 minutes to obtain the aqueous phase; wherein, the structural formula of the bisallyl polyether is shown in the following formula VI:

[0055]

[0056] In formula VI, EO is -OCH 2 CH 2 -(Oxiranyl), PO is -OCH(CH 3 )CH 2 -(glycidyl group); 0≤x<55, 0≤y≤10, 0≤z≤16, x, y, and z are not 0 at the same time;

[0057] 2) Add the aqueous phase obtained in step 1) dropwise into the oil phase of the closed reactor, st...

experiment example 1

[0070] In this experimental example, the drag reducing performance of the drag reducing agents obtained in Examples 1-4 and Comparative Example was tested. The detection method is to add the obtained drag reducer to clear water so that the mass percentage of the multi-component copolymer is 0.06% to 0.15%, and to calculate the drag reduction rate by testing the pressure difference between two points before and after adding the drag reducer in clear water. Drag reduction effect evaluation. The formula for calculating the drag reduction rate is as follows:

[0071] D R % = ΔP 0 - ΔP D R ΔP 0 × 100 % - - - ( 1 ...

experiment example 2

[0077] In this experimental example, the gel-breaking performance of the drag reducer obtained in Examples 1-4 and Comparative Example was tested. The detection method is that the obtained drag reducer is added to clear water so that the mass percentage of the multi-polymer copolymer is 0.12%, and the mixture is obtained; 100g of the obtained mixture is weighed respectively, and 0.5g of the ammonium persulfate solution with a mass concentration of 10% is added, Placed at the set temperature, the change of the apparent viscosity of the test system is used to evaluate the breaking performance. The test results are shown in Table 2.

[0078] The gel-breaking performance detection result of the drag reducer obtained in table 2 embodiment 1-4 and comparative example

[0079]

[0080] It can be seen from Table 2 that compared with the comparative example, the initial apparent viscosity of the drag reducer obtained in Examples 1-4 is relatively large, and the apparent viscosity d...

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Abstract

The invention discloses an acrylamide/sodium acrylate multi-component copolymer, a method for preparing the same and an emulsion water-based fracturing fluid drag reducer. The acrylamide/sodium acrylate multi-component copolymer contains four structural units as shown in formulas I-IV. The method includes 1), mixing organic solvents and emulsifiers with one another to obtain oil phases; adding reactive monomers into water to obtain aqueous solution and regulating pH (potential of hydrogen) of the aqueous solution by the aid of sodium hydroxide until the pH is 7.0-7.5 so as to obtain water phases; 2), adding the water phases into the oil phases to obtain mixtures, stirring the mixtures to emulsify the mixtures, adding initiators into the mixtures and polymerizing the mixtures to obtain the acrylamide/sodium acrylate multi-component copolymer. The reactive monomers are acrylamide, acrylic acid, 2- acrylamide-2-methyl propane sulfonic acid and diallyl polyether. The acrylamide/sodium acrylate multi-component copolymer, the method and the emulsion water-based fracturing fluid drag reducer have the advantages that when the acrylamide/sodium acrylate multi-component copolymer is used as a drag reducer, the mass concentration is 0.06%-0.15%, the apparent viscosity is 6-21 mPa.s, the drag reduction rate is higher than or equal to 65%, and the acrylamide/sodium acrylate multi-component copolymer is excellent in drag reduction performance; the acrylamide/sodium acrylate multi-component copolymer is high in initial apparent viscosity, accordingly, the gel breaking speed can be increased, and the acrylamide/sodium acrylate multi-component copolymer and the emulsion water-based fracturing fluid drag reducer are excellent in gel breaking performance.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field drag-reducing fracturing fluids, and specifically relates to an acrylamide / sodium acrylate multi-polymer and a preparation method thereof, and also relates to an emulsion-type water-based fracturing fluid using the acrylamide / sodium acrylate multi-polymer Crack fluid drag reducer. Background technique [0002] With the upsurge in the exploitation of unconventional oil and gas resources, hydraulic fracturing has become more and more important as a technical measure for oil and gas stimulation, and it is suitable for the development of low-permeability unconventional reservoirs. Drag reducers and some additives are used as working fluids, fracturing operations with a small amount of proppant added during construction) are increasingly popularized. Therefore, the use of additives in slick water fracturing fluids, especially the application and demand of drag reducers more and more. [000...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/56C08F220/06C08F220/58C08F2/32C09K8/68C09K8/88
CPCC08F2/32C08F283/065C09K8/68C09K8/882C09K2208/28C08F220/585
Inventor 李克智李国锋乔国安程秋菊陈付虎梅洁姚昌宇高志军胡艾国郝以周唐勤刘伟华
Owner CHINA PETROLEUM & CHEM CORP
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