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Salt-resistant Gemini amphoteric ion viscoelastic surfactant and preparation method of high salinity water-based cleaning fracturing fluid

A surfactant and clean fracturing fluid technology, applied in the preparation of sulfonate, chemical instruments and methods, preparation of sulfonic acid, etc., can solve problems such as non-resistance to salinity, and achieve good salt resistance and good viscoelasticity , the effect of strong surface activity

Active Publication Date: 2019-09-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a salt-tolerant gemini zwitterionic viscoelastic surfactant and its preparation method and high salinity water-based clean fracturing fluid to solve the problem of the existing viscoelastic surfactant in the application of clean fracturing fluid The problem of intolerance to salinity in

Method used

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  • Salt-resistant Gemini amphoteric ion viscoelastic surfactant and preparation method of high salinity water-based cleaning fracturing fluid

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Embodiment 1

[0049] The method of synthesizing the salt-tolerant type gemini zwitterionic viscoelastic surfactant with erucamide propyl dimethylamine of the present embodiment is as follows:

[0050] Epichlorohydrin and taurine are obtained by reacting at 40°C for 6 hours in a mixture of water and ethanol at a molar ratio of 2:1. Then, the molar ratio of erucamide propyl dimethylamine and the intermediate is (2-2.5): 1, and the mixed solution of water and ethanol is used as the solvent. Hour. Evaporate the solvent at 80°C on a rotary evaporator, dissolve the crude product with ethyl acetate at 40°C, and then recrystallize the ethyl acetate solution at 5°C to remove unreacted erucamide propyl dimethyl amine to obtain a crystalline product; the crystalline product was treated by rotary evaporation to remove ethyl acetate to obtain a pure salt-tolerant gemini zwitterionic viscoelastic surfactant.

Embodiment 2

[0052] Take the viscoelastic surfactant in Example 1, use the 3wt% seawater-based clean fracturing fluid prepared by South China Sea seawater in Table 1, at 140°C, 170s -1 Under the condition of shearing for about 2 hours, the apparent viscosity is still above 50mPa.s, which meets the requirements of the industry standard SY / T6376-2008.

Embodiment 3

[0054] Get the viscoelastic surfactant in Example 1, use the 3wt% seawater-based clean fracturing fluid prepared by the Gulf of Mexico seawater in Table 1, at 140 ° C, 170s -1 Under the condition of shearing for about 2 hours, the apparent viscosity is still above 40mPa.s, which meets the requirements of the industry standard SY / T6376-2008.

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Abstract

The invention provides a preparation method of an amphoteric ion type Gemini viscoelastic surfactant and a formula of a high salinity water-based cleaning fracturing fluid with the amphoteric ion typeGemini viscoelastic surfactant as a thickening agent, wherein the high salinity water-based cleaning fracturing fluid comprises a salt-resistant Gemini viscoelastic surfactant 2-5 wt%, inorganic salt3-20 wt% and that balance of water, namely the cleaning fracturing fluid prepared from offshore water or stratum produced water with the salinity of 30,000-200 000 mg / L. This type of viscoelastic surfactant can be directly formulated with marine water or stratum produced water, and the prepared fracturing fluid has good temperature resistance and shear resistance, at the shearing condition of 140DEG C, 170 s<-1>, the viscosity remains above 40 mPa.s after 2 hours.

Description

technical field [0001] The invention relates to the technical field of surfactants used in petroleum reservoirs, in particular to a salt-tolerant gemini zwitterionic viscoelastic surfactant, a preparation method thereof and a configuration of high-salinity water-based clean fracturing fluid, which can be used in fresh water resources High salinity formation water or seawater is used to directly prepare a clean fracturing fluid system for oil and gas well stimulation in inland areas or offshore oil and gas projects where there is a shortage. Background technique [0002] With the rapid development of oil and gas exploration, a large number of low-permeability or ultra-low-permeability unconventional oil and gas reservoirs have attracted more and more attention from petroleum workers. The exploitation of such reservoirs needs to undergo reservoir stimulation and transformation to achieve economical and effective development. . Among the reservoir stimulation technologies, hyd...

Claims

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Application Information

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IPC IPC(8): C09K8/68C07C303/32C07C309/14
CPCC07C303/22C07C303/32C09K8/602C09K8/665C09K8/68C09K2208/30C07C309/14
Inventor 毛金成张文龙林冲杨小江毛金桦
Owner SOUTHWEST PETROLEUM UNIV
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