Shale gas fracturing fluid and preparation method thereof

A gas pressure and shale technology, which is applied in the field of shale gas fracturing fluid and its preparation, can solve the problems of formation permeability damage, affecting the effect of fracturing production increase, etc., and achieve formation permeability without damage, good gel breaking effect, easy The effect of mass production

Inactive Publication Date: 2019-11-15
四川洁能锐思石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional fracturing fluids have a high amount of insoluble residues after gel breaking. These residues can block rock pores, easily cause damage to formation permeability, and seriously affect the effect of fracturing stimulation.

Method used

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  • Shale gas fracturing fluid and preparation method thereof
  • Shale gas fracturing fluid and preparation method thereof
  • Shale gas fracturing fluid and preparation method thereof

Examples

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preparation example Construction

[0032] The present invention provides the preparation method of the shale gas fracturing fluid described in the above scheme, comprising the following steps:

[0033] (1) Mix cetyltrimethylammonium bromide, 2-acrylamide-2-methylpropanesulfonic acid, N, N-dimethylacrylamide, KCl and water under heating conditions, and after cooling get mixed solution;

[0034] (2) Mixing the mixed liquid with a co-surfactant and low-carbon small molecule alcohol to obtain the shale gas fracturing liquid.

[0035] In the present invention, cetyltrimethylammonium bromide, 2-acrylamide-2-methylpropanesulfonic acid, N, N-dimethylacrylamide, KCl and water are mixed under heating conditions, and obtained after cooling Mixture. In the present invention, the heating temperature is preferably 40-60°C, more preferably 50°C. The present invention has no special requirements on the heating method, and a heating method well known in the art can be used. In the present invention, the order of mixing is p...

Embodiment 1

[0040] A shale gas fracturing fluid, comprising the following components in mass percentage: cetyltrimethylammonium bromide 2%, 2-acrylamide-2-methylpropanesulfonic acid 3.5%, N, N - Dimethacrylamide 5%, Sodium Lauryl Sulfonate 0.7%, Propylene Glycol 3%, KCl 2%, balance water.

[0041] The fracturing fluid is prepared by the following method:

[0042](1) Mix cetyltrimethylammonium bromide, 2-acrylamide-2-methylpropanesulfonic acid, N, N-dimethylacrylamide, KCl and water under heating conditions, and after cooling Obtain a mixed solution; add cetyltrimethylammonium bromide into water to dissolve completely, raise the temperature to 40°C, and then add 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethyl Acrylamide and KCl were stirred for 70 minutes; each component was uniformly dissolved and cooled to room temperature, and aged at room temperature for 8 hours.

[0043] (2) Add sodium dodecylsulfonate and propylene glycol to the mixed liquid obtained in (1), and stir evenly...

Embodiment 2

[0059] A shale gas fracturing fluid, comprising the following components in mass percentage: cetyltrimethylammonium bromide 3.5%, 2-acrylamide-2-methylpropanesulfonic acid 3.5%, N, N -Dimethacrylamide 4%, sodium tetradecylsulfonate 1%, propylene glycol 3%, KCl 2.5%, balance water.

[0060] The fracturing fluid is prepared by the following method:

[0061] (1) Mix cetyltrimethylammonium bromide, 2-acrylamide-2-methylpropanesulfonic acid, N, N-dimethylacrylamide, KCl and water under heating conditions, and after cooling Obtain a mixed solution; add cetyltrimethylammonium bromide into water to dissolve completely, raise the temperature to 40°C, and then add 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethyl Acrylamide and KCl were stirred for 70 minutes; each component was uniformly dissolved and cooled to room temperature, and aged at room temperature for 8 hours.

[0062] (2) Add sodium tetradecylsulfonate and propylene glycol to the mixed liquid obtained in (1), and sti...

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Abstract

The invention provides shale gas fracturing fluid and a preparation method thereof, and relates to the technical field of oil and gas exploitation. The shale gas fracturing fluid provided by the invention comprises the following components in percentages by mass: 2-6.5% of cetyltrimethylammonium bromide, 2.5-5.5% of 2-acrylamide-2-methylpropanesulfonic acid, 3-6.5% of N, N-dimethylacrylamide, 0.4-1.6% of a cosurfactant, 2-7.5% of low-carbon micromolecular alcohol, 2-4% of KCl and the balance of water. According to the shale gas fracturing fluid, the hexadecyl trimethyl ammonium bromide and other components act together, so that the shale gas fracturing fluid has a good gel breaking effect, residues do not exist basically after gel breaking, and the in-place permeability is hardly damaged;and moreover, the shale gas fracturing fluid provided by the invention also has good shearing stability and sand suspending capacity, and is beneficial to improving mining and production improvement of shale gas. The invention provides a preparation method of the shale gas fracturing fluid. The preparation method is simple to operate, and large-scale production is easy to implement.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a shale gas fracturing fluid and a preparation method thereof. Background technique [0002] In the process of exploration and development of oil and gas fields, hydraulic fracturing of oil layers plays a very important role in improving the production and recoverable reserves of oil and gas reservoirs. Fracturing fluid is a general term for all highly viscous liquids used to create fractures and carry proppant into wells during hydraulic fracturing. Fracturing fluid not only plays the role of transmitting pressure in fracturing, but also can create fractures in the formation and transport proppant in the fractures, which is a key part of the fracturing process. [0003] Shale oil and gas resources refer to oil and natural gas stored in fine-grained clastic rocks rich in organic matter, part of which exists in pores and fractures in a free state, and part of whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/86
CPCC09K8/68C09K8/86
Inventor 赵仁凤
Owner 四川洁能锐思石油技术有限公司
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