Preparation of sulfonic acid amphoteric double-ion viscoelastic surfactant and application in fracturing fluid

A technology of surfactant and viscoelasticity, which is applied in the field of preparation of sulfonic acid amphoteric gemini viscoelastic surfactants, can solve the problems of temperature resistance and salt resistance performance limiting further application, and achieve the effect of excellent temperature resistance and shear resistance

Inactive Publication Date: 2020-01-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since Schlumberger first applied viscoelastic surfactant fracturing fluid to hydraulic fracturing in 1997, after more than 20 years of development, domestic and foreign scholars have developed viscoelastic surfactants mainly based on cationic, anionic, and non-ionic surfactants. Ionic and zwitterionic systems or mixed systems are the main ones, among which cationic viscoelastic surfactants are the most commonly used clean fracturing fluids, but the temperature and salt resistance of these surfactants limit their further application in production stimulation

Method used

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  • Preparation of sulfonic acid amphoteric double-ion viscoelastic surfactant and application in fracturing fluid
  • Preparation of sulfonic acid amphoteric double-ion viscoelastic surfactant and application in fracturing fluid
  • Preparation of sulfonic acid amphoteric double-ion viscoelastic surfactant and application in fracturing fluid

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Experimental program
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Embodiment 1

[0032] (1) First, dissolve 100mmol of erucamidopropyldimethylamine in a 500mL single-necked round bottom flask containing 150mL of isopropanol, then add 110mmol of epichlorohydrin into the round bottom flask, and stir at 80°C for 12h , after the reaction is over, the intermediate DNPC is obtained.

[0033] (2) Add 50mmol of sodium p-aminobenzenesulfonate and 200mL of distilled water to the intermediate DNPC obtained in the first step, and react at 90°C for 24h, and remove the solvent with a rotary evaporator after the reaction to obtain a light yellow viscous Thick liquid, that is, sulfonic acid amphoteric gemini viscoelastic surfactant VBS.

[0034] (3) The H NMR spectrum of sulfonic acid amphoteric gemini viscoelastic surfactant VBS is attached figure 1 shown.

[0035] (4) The clean fracturing fluid system composed of 20mmol / L sulfonic acid amphoteric gemini viscoelastic surfactant VBS and 120mmol / L NaSal was heated at 90°C for 170s. -1 After shearing for 90 minutes, the ...

Embodiment 2

[0037] (1) First, dissolve 100mmol of erucamidopropyldimethylamine in a 500mL single-necked round-bottomed flask containing 200mL of ethanol, then add 140mmol of epichlorohydrin to the round-bottomed flask, stir at 80°C for 12h, and react After the end, the intermediate DNPC is obtained.

[0038] (2) Add 48 mmol of sodium p-aminobenzenesulfonate and 200 mL of distilled water to the intermediate DNPC obtained in the first step, and react at 80° C. for 18 h, and remove the solvent with a rotary evaporator after the reaction to obtain a light yellow viscous Thick liquid, that is, sulfonic acid amphoteric gemini viscoelastic surfactant VBS.

[0039] (3) The clean fracturing fluid system composed of 30mmol / L sulfonic acid amphoteric gemini viscoelastic surfactant VBS and 120mmol / L NaSal was heated at 120°C for 170s. -1 After shearing for 90 minutes, the viscosity can be maintained above 25mPa·s. image 3 shown.

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Abstract

The invention discloses preparation of a sulfonic acid amphoteric double-ion viscoelastic surfactant and application in fracturing fluid. The preparation method includes: firstly subjecting long-chainaliphatic tertiary amine and epichlorohydrin to quaternization reaction on obtain an intermediate DNPC; and then reacting the DNPC with sodium sulfanilate to obtain the sulfonic acid amphoteric double-ion surfactant VBS. The preparation method disclosed by the invention has the characteristics of high yield, no industrial waste residue and environmental friendliness. In addition, the sulfonic acid amphoteric double-ion viscoelastic surfactant VBS is compounded with an inorganic salt counter ion to obtain a clean fracturing fluid system with excellent rheological properties. The system has theadvantages of strong sand suspending performance, simple on-site preparation, automatic gel breaking and small stratum damage. After 90min of shearing at 90DEG C and under 170s<-1>, the 10mmol/L VBSfracturing fluid system can maintain the viscosity at about 50mPa.S, and can meet the viscosity requirement of site construction for clean fracturing fluid.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and relates to the preparation of a sulfonic acid amphoteric gemini viscoelastic surfactant and its application in fracturing fluid. Background technique [0002] With the development of the petroleum industry to low-permeability reservoirs, due to the harsh downhole environment of deep wells, the amount of oil and gas recovered by conventional techniques is becoming less and less. Therefore, it is urgent to find a new way to develop these resources. At the same time, hydraulic fracturing technology is an effective means to improve oil and gas recovery for low-permeability reservoirs. As the working fluid in the process of hydraulic fracturing to stimulate oil and gas reservoirs, the performance of fracturing fluid directly affects the success or failure of fracturing operations and the stimulation effect of reservoirs after fracturing. Conventional polymer fracturing fluid and guar gum fractu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/22C07C303/32C07C309/46C09K8/68C09K23/22
CPCC07C309/46C09K8/68C09K23/00
Inventor 毛金成张阳林冲徐涛杨小江
Owner SOUTHWEST PETROLEUM UNIV
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