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Temperature-resistant dihydroxyl cationic viscoelastic surfactant, preparation method thereof, fracturing fluid and application of temperature-resistant dihydroxyl cationic viscoelastic surfactant

A technology of surfactant and dihydroxy cation, which is applied in the fields of high-temperature fracturing fluid, surfactant, and hot dry rock stimulation, can solve problems such as insufficient temperature and limited temperature resistance of VES clean fracturing fluid, and achieve high durability High temperature capability, excellent viscoelasticity and shear resistance, simple preparation method

Pending Publication Date: 2022-07-29
四川零碳智慧科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At the same time, during the fracturing construction process, the VES clean fracturing fluid exposed to limited temperature resistance in practical engineering applications, and the Gemini cationic VES system developed in the later stage has greatly improved the temperature resistance of VES fracturing fluid. But its temperature is not enough for hot dry rock development

Method used

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  • Temperature-resistant dihydroxyl cationic viscoelastic surfactant, preparation method thereof, fracturing fluid and application of temperature-resistant dihydroxyl cationic viscoelastic surfactant
  • Temperature-resistant dihydroxyl cationic viscoelastic surfactant, preparation method thereof, fracturing fluid and application of temperature-resistant dihydroxyl cationic viscoelastic surfactant
  • Temperature-resistant dihydroxyl cationic viscoelastic surfactant, preparation method thereof, fracturing fluid and application of temperature-resistant dihydroxyl cationic viscoelastic surfactant

Examples

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Effect test

Embodiment 1

[0040] Example 1 Synthesis of temperature-resistant dihydroxy cationic viscoelastic surfactant

[0041] The preparation method of the present embodiment is as follows:

[0042]In the solution of 2-phenylbenzoic hydrazide and epichlorohydrin in ethanol, add the amount in a molar ratio of 1:1.2, and add HCl in the same molar ratio as epichlorohydrin at the same time, and react at 80 ° C for 10 hours , and finally, ethanol, excess epichlorohydrin and HCl were removed by rotary evaporation to obtain an intermediate.

[0043] The surfactant is to dissolve the erucamidopropyl dimethylamine and the intermediate in an ethanol solution with a molar ratio of 1:1, heating the temperature to 80 ° C, and reacting for 12 hours to obtain a temperature-resistant bishydroxy cationic viscoelastic surfactant. crude product. The above-mentioned preparation process also includes its proposed process: dissolving the crude product with ethyl acetate at 50° C., and then recrystallizing the crude pr...

Embodiment 2

[0044] Example 2 Preparation of fracturing fluid

[0045] Take the viscoelastic surfactant in Example 1, configure fracturing fluid according to the water injection quality standard for hot dry rock development in a certain place in Qinghai, add 4.3% viscoelastic surfactant, and the remaining consumption is water (see Table 1 for specific water quality) , configured as a temperature-resistant and fast-dissolving clean fracturing fluid and tested its rheological properties, the results are as follows figure 1 shown, at 200°C, 170s -1 Under 2 hours of shearing, the apparent viscosity remains above 30mPa·s, which meets the requirements of the industry standard SY / T6376-2008.

Embodiment 3

[0046] Example 3 Preparation of fracturing fluid

[0047] Take the viscoelastic surfactant in Example 1, configure fracturing fluid according to the water injection quality standard for hot dry rock development in a certain place in Qinghai, add 4.3% viscoelastic surfactant, and the remaining consumption is water (see Table 1 for specific water quality) , configured as a temperature-resistant clean fracturing fluid and tested its rheological properties, the results are as follows figure 2 shown, at 220°C, 170s -1 Under 2 hours of shearing, the apparent viscosity remains above 30mPa·s, which meets the requirements of the industry standard SY / T6376-2008.

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Abstract

The invention provides a temperature-resistant dihydroxyl cationic viscoelastic surfactant, a preparation method thereof, fracturing fluid and application of the fracturing fluid, and belongs to the technical field of yield increase renovation. A double-benzene-ring structure, a dihydroxyl structure and a double-tail structure are designed in the molecular structure of the surfactant, so that the stability of the surfactant is improved, and the viscosity of the fracturing fluid is reduced; the viscoelastic surfactant can be directly prepared from water produced in the stratum; the fracturing fluid comprises 4.3-5 wt% of the superhigh-temperature-resistant surfactant, 3-8 wt% of inorganic salt and the balance of water, the clean fracturing fluid can be prepared from stratum produced water with the mineralization degree being 60000 mg / L or below, the fracturing fluid is good in temperature resistance and shearing resistance, the viscosity is maintained to be 30 mPa.s or above 2 hours after the fracturing fluid is sheared under the shearing conditions of 220 DEG C and 170 s <-1 >, and the fracturing fluid is a clean fracturing fluid which can be prepared from stratum produced water with the mineralization degree being 60000 mg / L or below. The method can be well applied to large-scale hydraulic development of hot dry rocks.

Description

technical field [0001] The invention relates to the technical field of surfactants, the technical field of high-temperature fracturing fluids, and the technical field of dry-hot rock stimulation and transformation, in particular to a temperature-resistant dihydroxy cationic viscoelastic surfactant and a preparation method thereof, and a fracturing fluids and their applications. Background technique [0002] Hot dry rock is a tight rock mass without water and steam, mainly distributed in the formation below 3000m. At this time, the temperature of hot dry rock mass is about 150-650 °C. In the conventional undeveloped hot dry rock formation, the geothermal energy stored in the rock cannot be directly extracted. This is because the natural fracture network is extremely scarce in the high temperature dry rock formation, resulting in reservoir fractures. poor connectivity. In order to develop and utilize the high-temperature geothermal stored in hot dry rock, it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C243/38C07C241/04C09K8/68C09K8/60E21B43/26
CPCC07C243/38C09K8/602C09K8/68E21B43/26C09K2208/30
Inventor 林冲
Owner 四川零碳智慧科技有限公司
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