A kind of surfactant for seawater-based recyclable clean fracturing fluid and preparation method thereof

A technology for cleaning fracturing fluids and surfactants, which is applied in the preparation of sulfonic acid, sulfate esters, chemical instruments and methods, etc., can solve the problems of unrecyclable fracturing fluid, large formation damage, and complicated fluid dispensing steps. Achieve the effect of improving the fracturing effect, reducing the damage of formation permeability, and eliminating the problem of environmental pollution

Active Publication Date: 2022-06-14
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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  • A kind of surfactant for seawater-based recyclable clean fracturing fluid and preparation method thereof
  • A kind of surfactant for seawater-based recyclable clean fracturing fluid and preparation method thereof
  • A kind of surfactant for seawater-based recyclable clean fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

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

[0048] Add 0.5mol of stearic acid and 150ml of DMF to a 500mL three-necked flask, stir and dissolve at 30°C, add 50ml of thionyl chloride dropwise through a constant pressure funnel, and then heat up to 80°C for reflux reaction for 2 hours; the excess is recovered by distillation under reduced pressure Thionyl chloride and DMF, the residual oily liquid is the intermediate of stearoyl chloride; add 100 mL of distilled water, 100 mL of acetone and 50 mL of 20% sodium hydroxide into a 500 mL three-necked flask, and 0.8 mol of O-sulfo-L- Serine was added to the flask and stirred to dissolve. The temperature of the ice bath was controlled at 5°C. The stearoyl chloride intermediate was slowly added dropwise to the three-necked flask with a constant pressure funnel, and 20% sodium hydroxide solution was simultaneously added dropwise to maintain pH=9 , After the dropwise addition of the fatty acid chloride intermediate...

Embodiment 2

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

[0061] Add 0.5mol palmitic acid and 150ml DMF to a 500mL three-necked flask, stir and dissolve at 30°C, add 50ml thionyl chloride dropwise through a constant pressure funnel, then heat up to 80°C for reflux reaction for 2h; Excessive thionyl chloride and DMF, the residual oily liquid is palmitic acid chloride intermediate; add 100 mL distilled water, 100 mL acetone and 50 mL 20% sodium hydroxide to a 500 mL three-necked flask, add 0.8 mol DL-B-sulfonic acid Alanine was added to the flask and stirred to dissolve. The temperature in the ice bath was controlled at 5°C, and the palmitic acid chloride intermediate was slowly added dropwise to the three-necked flask with a constant pressure funnel, and 20% sodium hydroxide solution was simultaneously added dropwise to maintain pH. =9, after the dropwise addition of the palmitic acid chloride intermediate, the temperature of the water bath was adjusted to 25°C and th...

Embodiment 3

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

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

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Abstract

The 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 N -acyl-O-serine sulfate surfactants, N-acyl sulfoalanine surfactants, N-acyl-O-phosphoserine surfactants, and combinations of the above surfactants and viscosity builders Prepare seawater-based recyclable clean fracturing fluid, which is used to solve the technical problems that the existing seawater-based fracturing fluid cannot be recycled, has great damage to the formation, and cumbersome liquid preparation steps; the N-acyl-O-sulfuric acid prepared by the present invention Serine surfactants, N-acyl sulfoalanine salt surfactants and N-acyl-O-phosphoserine surfactants, use their own pH response properties to realize multiple recycling of clean fracturing fluids, eliminating It solves the problem of environmental pollution caused by flowback fluid, greatly improves the effect of fracturing reconstruction and the efficiency of fracturing construction, and is worth popularizing.

Description

technical field [0001] The invention relates to a surfactant and a preparation method thereof, in particular to a surfactant for seawater-based recyclable clean fracturing fluid and a preparation method thereof. Background technique [0002] At present, hydraulic fracturing technology is the preferred means of stimulation for the development of offshore low-permeability oil and gas reservoirs. However, due to the limitations of space, transportation, and cost, conventional freshwater-based fracturing fluids are difficult to meet the needs of large-scale fracturing offshore. At the same time, fracturing flowback The fluid needs to be transported back to land for treatment and then reinjected or discharged, 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 fractur...

Claims

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Application Information

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Patent Type & Authority Patents(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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