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Surfactant for seawater-based recyclable clean fracturing fluid and preparation method of the surfactant

A surfactant and cleaning fracturing fluid technology, which is applied in the direction of sulfonic acid preparation, sulfuric acid ester preparation, chemical instruments and methods, etc., can solve the problems of cumbersome liquid preparation steps, large formation damage, and fracturing fluid that cannot be recycled. Achieve the effects of eliminating the problem of environmental pollution, less damage to formation permeability, and improving the effect of fracturing

Active Publication Date: 2020-05-22
JIANGSU OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention discloses a surfactant for seawater-based recyclable and clean fracturing fluid and a preparation method thereof, wherein the surfactant for seawater-based recyclable and clean fracturing fluid includes a pH Regulating and salt-tolerant N-acyl-O-sulphated serine surfactants, N-acyl sulfoalaninate surfactants, N-acyl-O-phosphoserine surfactants, and the above-mentioned surfactants The seawater-based recyclable clean fracturing fluid is obtained by compounding with a viscosifying agent, which is used to solve technical problems such as the inability to recycle the existing seawater-based fracturing fluid, great damage to the formation, and cumbersome liquid preparation steps. The specific technical solutions are as follows:

Method used

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  • Surfactant for seawater-based recyclable clean fracturing fluid and preparation method of the surfactant
  • Surfactant for seawater-based recyclable clean fracturing fluid and preparation method of the surfactant
  • Surfactant for seawater-based recyclable clean fracturing fluid and preparation method of the surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) Synthesis of N-acyl-O-serine sulfate surfactant

[0048] Add 0.5mol stearic acid and 150ml DMF into a 500mL three-necked flask, stir and dissolve at 30°C, add 50ml of thionyl chloride dropwise through a constant pressure funnel, then raise the temperature to 80°C and reflux for 2 hours; recover excess by vacuum distillation Thionyl chloride and DMF, the residual oily liquid is the stearyl chloride intermediate; in a 500mL three-necked flask, add 100mL distilled water, 100ml acetone and 50ml of 20% sodium hydroxide, 0.8mol O-sulfo-L- Add serine into the flask and stir to dissolve. Control the temperature in an ice bath at 5°C. Slowly add the stearyl chloride intermediate to the three-necked flask with a constant pressure funnel, and simultaneously add 20% sodium hydroxide solution dropwise to maintain pH = 9 After the fatty acid chloride intermediate is added dropwise, adjust the temperature of the water bath to 25°C and continue to stir the reaction for 2 hours. Aft...

Embodiment 2

[0060] (1) Synthesis of N-acyl sulfoalanine salt surfactant

[0061] Add 0.5mol palmitic acid and 150ml DMF into a 500mL three-necked flask, stir and dissolve at 30°C, add 50ml of thionyl chloride dropwise through a constant pressure funnel, then heat up to 80°C and reflux for 2 hours; recover by distillation under reduced pressure Excess thionyl chloride and DMF, the residual oily liquid is the palmitoyl chloride intermediate; add 100mL distilled water, 100ml acetone and 50ml of 20% sodium hydroxide in a 500mL three-necked flask, and 0.8mol DL-B-sulfo Add alanine into the flask and stir to dissolve. Control the temperature in an ice bath at 5°C. Slowly add the palmitoyl chloride intermediate to the three-necked flask with a constant pressure funnel, and simultaneously add 20% sodium hydroxide solution dropwise to maintain the pH =9, after the palmitoyl chloride intermediate is added dropwise, adjust the temperature of the water bath to 25°C and continue to stir the reaction f...

Embodiment 3

[0073] (1) Synthesis of N-acyl-O-phosphoserine surfactant

[0074] Add 0.5mol palmitic acid and 150ml DMF into a 500mL three-necked flask, stir and dissolve at 30°C, add 50ml of thionyl chloride dropwise through a constant pressure funnel, then raise the temperature to 80°C and reflux for 2 hours, and recover the excess by vacuum distillation Thionyl chloride and DMF, the residual oily liquid is palmitoyl chloride intermediate; add 100mL distilled water, 100ml acetone and 50ml 20% sodium hydroxide aqueous solution in a 500mL three-necked flask, add 0.8mol L-O-phosphoserine to the flask And stir to dissolve; ice bath control temperature at 5°C, slowly drop the palmitoyl chloride intermediate into the three-necked flask with a constant pressure funnel, and simultaneously add 20% aqueous sodium hydroxide solution dropwise to maintain pH = 9; palmitoyl chloride After the intermediate is added dropwise, adjust the temperature of the water bath to 25°C and continue to stir the react...

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Abstract

The invention discloses a surfactant for seawater-based recyclable clean fracturing fluid and a preparation method of the surfactant. The surfactant comprises an N-acyl-O-serine sulfate surfactant, anN-acyl sulfo alanine salt surfactant and an N-acyl-O-phosphoserine surfactant which have pH regulation and salt tolerance properties. The seawater-based recyclable clean fracturing fluid obtained bycompounding the disclosed surfactant and a tackifying auxiliary agent is used for solving the technical problems that existing seawater-based fracturing fluid cannot be recycled, damage to the stratumis large, and the fluid preparation steps are tedious. Through the pH response performance of the N-acyl-O-serine sulfate surfactant, the N-acyl sulfo alanine salt surfactant and the N-acyl-O-phosphoserine surfactant prepared, repeated cyclic utilization of the clean fracturing fluid is achieved, the problem of environmental pollution caused by flowback fluid is solved, the fracturing transformation effect and fracturing construction efficiency are greatly improved, and the surfactant is worthy of popularization.

Description

technical field [0001] The invention relates to a surfactant and a preparation method thereof, in particular to a surfactant used for seawater-based recyclable cleaning fracturing fluid and a preparation method thereof. Background technique [0002] At present, hydraulic fracturing technology is the preferred stimulation method for developing offshore low-permeability oil and gas reservoirs, but conventional freshwater-based fracturing fluids are limited by factors such as space, transportation, and cost, and it is difficult to meet the needs of large-scale offshore fracturing. The fluid needs to be transported back to the land for treatment and reinjection or discharge, which has the disadvantages of high technical difficulty and high cost; seawater-based fracturing fluid is not limited by space, transportation and cost, and can meet the needs of continuous mixing, and can realize multi-well, multi-layer and multi-stage Large-scale fracturing significantly reduces productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/68C07C303/24C07C305/06C07C303/22C07C309/18C07F9/09
CPCC09K8/602C09K8/68C07C303/24C07C303/22C07F9/091C09K2208/30C07C305/06C07C309/18
Inventor 严志虎钱锋李明孙浩南胡同欣
Owner JIANGSU OCEAN UNIV
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