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Compound desulfurizer suitable for high oil content oil well and preparation method thereof

A technology of oil content and desulfurization agent, which is applied in the field of compound desulfurization agent and its preparation, can solve the problems of poor miscibility between desulfurization agent and crude oil, difficult handling of reaction products, and low antifreeze performance, so as to facilitate subsequent processing and prevent sulfide High effect of iron deposition and antifreeze performance

Inactive Publication Date: 2019-04-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a compound desulfurizer suitable for oil wells with high oil content and its preparation method, which can overcome the poor miscibility between desulfurizer and crude oil, low antifreeze performance, low sulfur capacity, long processing time and low desulfurization efficiency. , Reaction products are difficult to handle and other shortcomings

Method used

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  • Compound desulfurizer suitable for high oil content oil well and preparation method thereof
  • Compound desulfurizer suitable for high oil content oil well and preparation method thereof
  • Compound desulfurizer suitable for high oil content oil well and preparation method thereof

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preparation example Construction

[0025] The preparation method of the desulfurizer: adjust the pH to 7 with ethanolamine, place it at 0°C for 12 hours, put it into a three-necked flask, place it in an ice-water bath, add formaldehyde at 0°C for 12 hours, stir and adjust the pH to 8, and add a surfactant Stir for 10 minutes, store at 0°C for 2 hours, add small molecule alcohols, stir for 10 minutes, add water, continue stirring for 10 minutes, and blow liquid nitrogen for 10 minutes to obtain the product.

[0026] Among them, formaldehyde was added at a rate of 1.5 mL / min. After the formaldehyde was added, the stirring gradient was adjusted, and the pH was adjusted to 8 after rapid stirring for 1 hour and slow stirring for 0.5 hour.

[0027] Principle of the present invention is:

[0028] The core component of the desulfurizer is the reaction product of aldehydes and alcohol amine compounds. It is easy to undergo a nucleophilic substitution reaction with hydrogen sulfide, and the nitrogen atom on the ring is e...

Embodiment 1

[0031] Adjust the pH to 7 with 42g of ethanolamine, place it at 0°C for 12h, put it into a 500mL three-necked flask, put it in an ice-water bath, add 42g of formaldehyde at a rate of 1.5mL / min, put it at 0°C for 12h, and adjust the stirring gradient, quickly Stir for 1 h, then slowly stir for 0.5 h, adjust the pH to 8, add 4 g of nonylphenol ethoxylate-10, stir rapidly for 10 min, and store at 0°C for 2 h. Add 2 g of ethanol, stir rapidly for 10 minutes, add water, continue stirring rapidly for 10 minutes, and then blow liquid nitrogen for 10 minutes to store.

Embodiment 2

[0033] Operation method is the same as embodiment 1. The masses of the substances taken were: 42g ethanolamine, 46g formaldehyde, 11g alkylphenol polyoxyethylene ether-10, 5g methanol, and 96g water.

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Abstract

The invention discloses a compound desulfurizer suitable for a high oil content oil well and a preparation method thereof. The desulfurizer is prepared from the following components in percent by mass: 20-27.5% of formaldehyde, 20-27.5% of ethanol amine, 2-7% of a surfactant, 1-5% of small molecular alcohol and the balance water. The desulfurizer is low in viscosity and is in full contact with rawoil. The desulfurizer is good in mutual dissolution effect, high in antifreezing performance, short in reaction time and easy to prepare. The desulfurizer achieves an effect through a reaction of a reaction product of aldehyde and a alkylol amine compound and hydrogen sulfide, and the surfactant plays an emulsifying role, so that the mutual dissolution effect of raw oil and the desulfurizer is good. The small molecular alcohol is taken as an anti-freezing liquid, the desulfurizer can be still used in a subzero environment. The sulphur removal efficiency of the desulfurizer reaches over 98%, the reaction product is easy for follow-up treatment, deposition of ferrous sulfide is prevented, and a normal oil extraction operation is not affected.

Description

technical field [0001] The invention belongs to the technical field of crude oil exploitation, and relates to the treatment of hydrogen sulfide in oil well associated gas and secondary hydrogen sulfide gas produced by bacteria, in particular to a compound desulfurizer suitable for oil wells with high oil content and its preparation. Background technique [0002] Hydrogen sulfide in associated gas will increase the cost and difficulty of crude oil extraction. Hydrogen sulfide is an acidic gas, which will cause corrosion of metal equipment and pipelines and aging of non-metallic materials through a series of chemical reactions; the produced ferrous sulfide is deposited in pipelines and equipment, increasing the difficulty of mining and potential safety hazards. At the same time, hydrogen sulfide is a toxic substance, and associated gas and secondary hydrogen sulfide will pose potential safety hazards to oil well workers and surrounding residents. In addition, hydrogen sulfide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G29/20C10G19/00
CPCC10G19/00C10G29/20C10G2300/207
Inventor 张璇周立辉李岩刘沛华穆谦益冀忠伦
Owner PETROCHINA CO LTD
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