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Ultrahigh-temperature-resistant low-viscosity low-corrosion emulsifier and emulsified acid system containing same

A low-viscosity, ultra-high-temperature technology, applied in the field of emulsified acid systems, can solve the problems of easily damaged structures and loss of use significance, and achieve the effects of reducing the rate of acid-rock reaction, excellent temperature resistance, and low friction

Active Publication Date: 2021-03-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the current emulsified acid system at home and abroad is easily destroyed at ultra-high temperature, thus losing the meaning of its use.

Method used

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  • Ultrahigh-temperature-resistant low-viscosity low-corrosion emulsifier and emulsified acid system containing same
  • Ultrahigh-temperature-resistant low-viscosity low-corrosion emulsifier and emulsified acid system containing same
  • Ultrahigh-temperature-resistant low-viscosity low-corrosion emulsifier and emulsified acid system containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0036] An emulsified acid system resistant to ultra-high temperature, low viscosity and low corrosion, comprising the following components in parts by weight:

[0037] 4 parts of viscoelastic surfactant with 3 hydrophobic tail chains prepared from docosenoic acid acyl propyl dimethyl tertiary amine and halogenated compound, 4 parts of sorbitan fatty acid ester polyoxyethylene ether, 2 parts of corrosion inhibitor (Mannich base synthesized from ethylenediamine, acetophenone and formaldehyde), 2 parts of iron ion stabilizer (sodium erythorbate), 30 parts of hydrochloric acid, and the balance is diesel oil.

[0038] Wherein, the preparation method of the halogenated compound is as follows: drip epichlorohydrin into the ethanol solution of N,N-dimethylpropylenediamine, react at room temperature for 10 hours, then remove the solvent and perform solid-liquid separation to obtain A compound with 3 halogenated head groups; the molar ratio of N,N-dimethylpropylenediamine to epichlorohy...

Embodiment 2

[0043] An emulsified acid system resistant to ultra-high temperature, low viscosity and low corrosion, comprising the following components in parts by weight:

[0044] 4 parts of viscoelastic surfactant with 2 hydrophobic tail chains prepared from docosenoic acid acyl propyl dimethyl tertiary amine and halogenated compound, 4 parts of sorbitan fatty acid ester polyoxyethylene ether, 2 parts of corrosion inhibitor (Mannich base synthesized from ethylenediamine, acetophenone and formaldehyde), 2 parts of iron ion stabilizer (sodium erythorbate), 30 parts of hydrochloric acid, and the balance is diesel oil.

[0045] Wherein, the preparation method of the halogenated compound is as follows: drip epichlorohydrin into the organic solution of butanolamine, react at room temperature for 10 hours, then remove the solvent and perform solid-liquid separation to obtain the compound having two halogenated head groups. Compound; the molar ratio of butanolamine to epichlorohydrin is 1:2.

...

Embodiment 3

[0050] An emulsified acid system resistant to ultra-high temperature, low viscosity and low corrosion, comprising the following components in parts by weight:

[0051] 4 parts of viscoelastic surfactant with 1 hydrophobic tail chain prepared from docosenoic acid acyl propyl dimethyl tertiary amine and halogenated compound (1-chlorobutane), 4 parts of sorbitan fatty acid ester 4 parts of polyoxyethylene ether, 2 parts of corrosion inhibitor (Mannich base synthesized by ethylenediamine, acetophenone and formaldehyde), 2 parts of iron ion stabilizer (sodium erythorbate), 30 parts of hydrochloric acid, and the balance is diesel fuel.

[0052] The preparation process is as follows: add emulsifier and corrosion inhibitor to diesel oil, add iron ion stabilizer to acid solution, put the oil phase in a high-speed disperser at a speed of 2800r / min for ten minutes, and at the same time use peristaltic The pump drips the acid solution into the oil phase at a rate of 6mL / min to obtain an ...

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Abstract

The invention discloses an ultrahigh-temperature-resistant low-viscosity low-corrosion emulsifier and an emulsified acid system containing the same. The ultrahigh-temperature-resistant low-viscosity low-corrosion emulsifier comprises at least one viscoelastic surfactant; the viscoelastic surfactant is prepared from fatty acid acyl propyl dimethyl tertiary amine and a halogenated compound through quaternization reaction; or the viscoelastic surfactant is prepared from a long-chain halogenated hydrocarbon and a tertiary amine compound through quaternization reaction; or the viscoelastic surfactant is prepared by reacting a fatty acid acyl propyl dimethyl tertiary amine with a linking group generated by reaction of epoxy chloropropane and alkylamine compounds. The preparation method is simple, and the prepared emulsified acid is an acid-in-oil emulsion, has very excellent temperature resistance, stability, low viscosity, low friction resistance and slight corrosion to metal pipes, can bestabilized for not less than 7 hours at 160 DEG C, and can effectively reduce the rate of acid-rock reaction in a high-temperature deep well and reduce the corrosion rate of acid liquor to the pipes.

Description

technical field [0001] The invention belongs to the technical field of emulsified acid system development in oil and gas fields, and in particular relates to an emulsifier resistant to ultra-high temperature, low viscosity and low corrosion and an emulsified acid system containing the emulsifier. Background technique [0002] In the later stage of oil and gas production, acidizing is often used to increase production due to reasons such as low production. Hydrochloric acid is the most commonly used in acidizing construction. Hydrochloric acid is a non-oxidizing acid. The injection of acid into the dissolution and penetration channels will produce artificial fractures and dredge pores, so the recovery rate can be greatly improved. However, in the acidizing process for carbonate rocks, long fractures cannot be effectively formed because the acid rocks react very quickly. In order to solve the problem of fast reaction speed of acid rock, an emulsified acid system is proposed t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72C09K8/74
CPCC09K8/72C09K8/74C09K2208/30C09K2208/32C09K8/54C09K8/602
Inventor 毛金成韩涤非杨小江张恒
Owner SOUTHWEST PETROLEUM UNIV
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