Beta-CD gemini viscoelastic surfactant, preparation method and temperature-resistant and salt-resistant clean fracturing fluid

A surfactant, cleaning fracturing fluid technology, applied in chemical instruments and methods, dissolution, drilling composition, etc., to achieve the effect of excellent temperature resistance and shear resistance

Pending Publication Date: 2021-11-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the clean fracturing fluid formulated with gemini surfactant as a thickening agent can achieve temperature resistance, there is no report on the clean fracturing fluid that can improve the temperature resistance and also have salt resistance

Method used

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  • Beta-CD gemini viscoelastic surfactant, preparation method and temperature-resistant and salt-resistant clean fracturing fluid
  • Beta-CD gemini viscoelastic surfactant, preparation method and temperature-resistant and salt-resistant clean fracturing fluid
  • Beta-CD gemini viscoelastic surfactant, preparation method and temperature-resistant and salt-resistant clean fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of β-CD gemini viscoelastic surfactant, its structural formula is:

[0044]

[0045] The preparation method of above-mentioned β-CD gemini viscoelastic surfactant, comprises the following steps:

[0046] (1) Preparation of mono-6-p-toluenesulfonyl-β-cyclodextrin (6-OTs-β-CD)

[0047] Take a 250mL beaker and suspend 50g (44.1mmol) of β-cyclodextrin in a mixture of 100mL of ethanol and water (volume ratio 5:1) by magnetic stirring under ice-salt bath conditions, and dissolve 16.7mL of sodium hydroxide solution (8.5mol / L) was slowly dropped into the β-cyclodextrin suspension, and the suspension became clear. Then 25.22g (132.3mmol) of p-toluenesulfonyl chloride (p-TsCl) was dissolved in acetonitrile solution and dropped into the above sodium hydroxide solution of cyclodextrin. After the dropwise addition, the reaction was continued at 22°C for 2 hours. After the reaction, the unreacted p-TsCl was filtered off with suction, and the filtrate was neutralized with di...

Embodiment 2

[0061] A kind of β-CD gemini viscoelastic surfactant, its structural formula is:

[0062]

[0063] The preparation method of above-mentioned β-CD gemini viscoelastic surfactant, comprises the following steps:

[0064] (1) Preparation of mono-6-p-toluenesulfonyl-β-cyclodextrin (6-OTs-β-CD)

[0065] Take a 250mL beaker and suspend 50g (44.1mmol) of β-cyclodextrin in a mixture of 100mL of ethanol and water (volume ratio 5:1) by magnetic stirring under ice-salt bath conditions, and dissolve 16.7mL of sodium hydroxide solution (8.5mol / L) was slowly dropped into the β-cyclodextrin suspension, and the suspension became clear. Then 25.22g (132.3mmol) of p-toluenesulfonyl chloride (p-TsCl) was dissolved in acetonitrile solution and dropped into the above sodium hydroxide solution of cyclodextrin. After the dropwise addition, the reaction was continued at 22°C for 2 hours. After the reaction, the unreacted p-TsCl was filtered off with suction, and the filtrate was neutralized with ...

Embodiment 3

[0079] A kind of β-CD gemini viscoelastic surfactant, its structural formula is:

[0080]

[0081] The preparation method of above-mentioned β-CD gemini viscoelastic surfactant, comprises the following steps:

[0082] (1) Preparation of mono-6-p-toluenesulfonyl-β-cyclodextrin (6-OTs-β-CD)

[0083] Take a 250mL beaker and suspend 50g (44.1mmol) of β-cyclodextrin in a mixture of 100mL of ethanol and water (volume ratio 5:1) by magnetic stirring under ice-salt bath conditions, and dissolve 16.7mL of sodium hydroxide solution (8.5mol / L) was slowly dropped into the β-cyclodextrin suspension, and the suspension became clear. Then 25.22g (132.3mmol) of p-toluenesulfonyl chloride (p-TsCl) was dissolved in acetonitrile solution and dropped into the above sodium hydroxide solution of cyclodextrin. After the dropwise addition, the reaction was continued at 22°C for 2 hours. After the reaction, the unreacted p-TsCl was filtered off with suction, and the filtrate was neutralized with ...

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Abstract

The invention discloses a beta-CD gemini viscoelastic surfactant, a preparation method and a temperature-resistant salt-resistant clean fracturing fluid. The beta-CD gemini viscoelastic surfactant is prepared from a cyclodextrin group, long-chain tertiary amine and epichlorohydrin, the critical micelle concentration of the surfactant is 2-3 orders of magnitude lower than that of a common surfactant, and the prepared surfactant serves as a thickening agent to be used for preparing the clean fracturing fluid. The clean fracturing fluid prepared by compounding the surfactant and counter ion salt or inorganic salt is low in usage amount, the viscosity can be maintained at about 150mPa.s after 60 minutes at the temperature of 120 DEG C and 170s<-1>, the viscosity requirement of on-site construction on the clean fracturing fluid is met, and the clean fracturing fluid has excellent temperature resistance, shearing resistance, viscoelasticity and suspension supporting effect and can be used for fracturing yield increase transformation of high-temperature oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a β-CD gemini viscoelastic surfactant, a preparation method and a temperature-resistant and salt-resistant cleaning fracturing fluid. Background technique [0002] In today's world, most of the world's large-scale high-permeability oil and gas fields have entered the late stage of exploitation, but the demand for oil in countries around the world continues to rise. Domestic and foreign oil exploration and development teams have begun to enter low-permeability, ultra-low-permeability and unconventional marginal oil and gas reservoirs. Reservoir fracturing has become the key to improving oil recovery. Oilfield production has continuously increased requirements for reservoir production and fracturing efficiency. Conventional reservoir stimulation (including stimulation technology and working fluid) has exposed various drawbacks. Especially with the development of unconven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/18B01F17/22C09K8/60C09K8/68C09K8/90C08B37/16C09K23/18C09K23/22
CPCC09K8/604C09K8/68C09K8/90C08B37/0012C09K2208/30
Inventor 毛金成徐涛毛金桦张阳杨小江林冲
Owner SOUTHWEST PETROLEUM UNIV
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