Composition for fracturing fluid drag reducer

A composition and compound technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as the narrow temperature range of drag reducers

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US 4615825 (Friction reduction using a viscoelasticsurfactant) discloses the use of cetyltrimethylammonium hydroxide, salicylic acid, etc. to form a friction reducer in an appropriate proportion, but the temperature range of the friction reducer in the prior art is narrow

Method used

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  • Composition for fracturing fluid drag reducer
  • Composition for fracturing fluid drag reducer
  • Composition for fracturing fluid drag reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 0.5mol hexadecane bromide, 0.75mol N-methyldiethanolamine, and 300g absolute ethanol together into a 2000ml reaction flask equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving flask. 100°C, the reaction was refluxed for 16h. The product obtained was cooled down and recrystallized in absolute ethanol to obtain a white solid, which was confirmed as the target product N-methyl-N, N-di(2-hydroxyethyl)-1-hexadecylammonium bromide by mass spectrometry[ MS-ESI (m / z): theoretical, 424; actual, 344 (M-Br)]. N,N-Dimethyl-N-(2-hydroxyethyl)-1-hexadecylammonium bromide and sodium salicylate are mixed in equal mass ratio. Dissolve it in water to prepare a 2000ppmw drag reducing agent aqueous solution, and keep it clear and transparent without precipitation for 7 days at 2°C. Test the drag reduction rate at different temperatures, the highest drag reduction rate can be maintained at 73%. figure 1 It is the drag reduction rate cur...

Embodiment 2

[0042] Add 0.5mol hexadecane bromide, 0.75mol N-methyldiethanolamine, and 300g absolute ethanol together into a 2000ml reaction flask equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving flask. 100°C, the reaction was refluxed for 16h. The product obtained was cooled down and recrystallized in absolute ethanol to obtain a white solid, which was confirmed as the target product N-methyl-N, N-di(2-hydroxyethyl)-1-hexadecylammonium bromide by mass spectrometry[ MS-ESI (m / z): theoretical, 424; actual, 344 (M-Br)]. The prepared cationic surfactant and sodium salicylate were dissolved in water to prepare a 2000ppmw drag reducer aqueous solution, which was kept clear and transparent at 2°C for 7 days without precipitation. Test the drag reduction rate at different temperatures, the highest drag reduction rate can be maintained at 70%. The applicable temperature range is 2~60℃.

Embodiment 3

[0044] Add 0.5mol hexadecane bromide, 0.75mol triethanolamine, and 300g absolute ethanol together into a 2000ml reaction bottle equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving bottle. The temperature of the oil bath is 100°C. Reflux for 16h. The obtained product was cooled down and recrystallized in absolute ethanol to obtain a white solid, which was confirmed by mass spectrometry as the target product N,N,N-tris(2-hydroxyethyl)-1-hexadecylammonium bromide [MS-ESI (m / z): theoretical value, 454; actual value, 374 (M-Br)]. The prepared cationic surfactant and sodium salicylate were dissolved in water to prepare a 2000ppmw drag reducer aqueous solution, which was kept clear and transparent at 2°C for 7 days without precipitation. Test the drag reduction rate at different temperatures, the highest drag reduction rate can be maintained at 70%. The applicable temperature range is 2~55℃.

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Abstract

The invention relates to a composition for a water-based fracturing fluid resistance reducing agent and an application of the composition serving as a fracturing fluid resistance reducing agent. The composition is mainly used for solving the problem of a narrow application temperature range of a resistance reducing agent in the prior art. The following technical scheme is adopted in the invention to well solve the technical problem: the water-based fracturing fluid resistance reducing agent comprises the cationic surface active agent and the aromatic acid salt as shown in formula (I); the aromatic acid salt is selected from at least one of the aromatic acid salt as shown in formula (II) or formula (III); the weight ratio of the cationic surface active agent to the aromatic acid salt is 1:1 to 1:50, and the composition can be used in a shale gas fracturing mining process. The formulas are described in the specification.

Description

technical field [0001] The invention relates to a composition for a water-based fracturing fluid drag reducer and an application of the composition as a fracturing fluid drag reducer. Background technique [0002] Shale gas reservoirs generally belong to ultra-low porosity and low permeability reservoirs, and the permeability is 2-3 orders of magnitude lower than that of tight clastic gas reservoirs. For such gas reservoirs, fracturing is an important aspect of exploration and development. means. The fracturing technology suitable for mining low-permeability and low-porosity unconventional reservoirs has been more and more applied in the exploitation of shale gas reservoirs. However, the injected water is hindered by the flow shear stresses in the pipes as well as in the rock formation, and the fluid displacement is greatly reduced. Effectively reducing the friction of the liquid can reduce the demand for equipment and reduce the construction cost to a certain extent. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K2208/28
Inventor 喻德峰翟晓东沙鸥李应成
Owner CHINA PETROLEUM & CHEM CORP
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