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Cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and preparation method thereof

A multi-component copolymerization and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of small temperature range and insufficient temperature resistance, and achieve a wide applicable temperature range, smooth construction, and increased production. obvious effect

Active Publication Date: 2014-12-03
CHENGDU BAICHUN PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with natural polymers, these polymers have the characteristics of strong thickening ability, good gel breaking performance, and less residue (or even no residue), but the synthetic polymer fracturing fluid also has the disadvantage of insufficient temperature resistance, which makes it suitable for small temperature range

Method used

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  • Cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and preparation method thereof
  • Cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and preparation method thereof
  • Cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Synthesis of cross-linkable high temperature resistant and residue-free multi-component copolymerization fracturing fluid thickener

[0050] Add acrylic acid, acrylamide, hexadecyldimethyldiallylammonium chloride, 2-acrylamido-2-methylpropanesulfonic acid and water into the reaction kettle and mix evenly, add caustic soda to adjust the pH value, The pH measured by the precise pH value is 8.8, adding the emulsifier sodium dodecylbenzene sulfonate, adding the redox initiator ammonium persulfate-sodium bisulfite, reacting at a temperature of 42°C for 5.5h, and at 90°C After hydrolysis for 5 hours, a colloidal product is obtained, and the colloid is granulated, dried, and pulverized to obtain a fracturing fluid thickener;

[0051] Taking the reaction total system quality as 100%, wherein, acrylic acid accounts for 3% of the total mass, acrylamide accounts for 33% of the total mass, cetyl dimethyl diallyl ammonium chloride accounts for 8% of the total mass, 2 -Acr...

Embodiment 2

[0053] Example 2 Synthesis of cross-linking agent for fracturing fluid

[0054] Add xylene into the reaction kettle as a solvent, add dodecyldimethyl tertiary amine, n-octadecyl alcohol and dimethyl sulfate as reactants, add sodium carbonate to adjust the pH value, and measure the pH value with precision pH test paper to be 7.9 , adding the catalyst azobisisobutyronitrile, and carrying out the hydrocarbylating reaction at 51° C. for 4 hours. After the reaction, cool and filter to obtain a solid product of the crosslinking agent for fracturing fluid.

[0055] In the above-mentioned reaction system, taking the total reaction system mass as 100%, wherein, hexadecyl dimethyl tertiary amine accounts for 18% of the total mass, n-stearyl alcohol accounts for 25% of the total mass, and dimethyl sulfate accounts for the total mass. 16% of the total mass, sodium carbonate accounts for 2% of the total mass, azobisisobutyronitrile accounts for 1% of the total mass, and the rest is the sol...

Embodiment 3

[0057] Embodiment 3 Preparation of gel breaker for fracturing fluid

[0058] Add polyimide and ethyl acetate (oil phase), a compound coating material, into the reaction kettle and stir to dissolve, then add potassium persulfate, blow nitrogen and stir, and control the solution temperature to 80°C. After reacting for 30 minutes, add emulsifier (Span 85 and Tween 60), thickener polyethylene glycol 600, and add water, keep the reaction temperature at 80°C, continue the reaction for 60 minutes, stop the reaction, spray the reactant through a spray drying device and granulate, and dried at 70°C until constant weight to obtain a gel breaker for fracturing fluid.

[0059] In the above reaction system, taking the total reaction system mass as 100%, polyimide accounts for 35% of the total mass, potassium persulfate accounts for 25% of the total mass, ethyl acetate accounts for 14% of the total mass, and the emulsifier Accounting for 8% of the total mass (the mass ratio of Span 85 to T...

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Abstract

The invention discloses a cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and a preparation method thereof. The preparation method comprises the following steps of (1) preparing a thickener for the fracturing fluid; (2) preparing a cross-linking agent for the fracturing fluid; (3) preparing a gel breaker for the fracturing fluid and (4) preparing the cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid. The fracturing fluid prepared by adopting the preparation method has the characteristics of excellent viscoelasticity, temperature resistance and shear resistance, sand-carrying performance and wide applicable temperature range; the fracturing fluid can well meet the requirement on the fracturing construction, and the content of the residue is very low; after the fracturing, the secondary harm to a reservoir is small and thus the fracturing effect is improved and the production capacity of the reservoir is increased.

Description

technical field [0001] The invention relates to the technical fields of oilfield chemistry and fracturing stimulation, in particular to a cross-linkable high-temperature-resistant and residue-free multi-component copolymerization fracturing fluid and a preparation method thereof. Background technique [0002] Apply high pressure through ground equipment and inject a suitable fluid into the development reservoir. After the formation fracture pressure is exceeded, the fluid will split the reservoir to create fractures, and at the same time carry proppant and spread it into the fracture. After the pressure is released, the fluid will After the gel is broken and flowed back into the formation, the proppant is filled in the newly generated fractures to form a fluid channel with high conductivity, thereby increasing the productivity of oil and gas wells or enhancing the injection capacity of water wells. This method of reservoir stimulation is hydraulic fracturing, and the fluid u...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F220/06C08F220/56C08F226/02C08F220/58C08F2/26
CPCC08F220/56C09K8/665C09K8/685C09K8/706C09K8/882C09K8/887C09K2208/26C08F226/02C08F220/06C08F220/585
Inventor 刘通义陈光杰林波胡永全
Owner CHENGDU BAICHUN PETROLEUM TECH
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