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Reverse demulsifier for heavy oil produced fluid and preparation method of reverse demulsifier

A reverse-phase demulsifier and production fluid technology, which is applied in chemical dehydration/demulsification, hydrocarbon oil treatment, petroleum industry, etc., can solve the problem that reverse-phase demulsifiers are not suitable for heavy oil or oil sand production fluid treatment, etc. problems, to achieve good demulsification, low equipment requirements, and rapid separation promotion

Active Publication Date: 2018-06-19
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the existing conventional reverse-phase demulsifiers are not suitable for the treatment of heavy oil or oil sand production fluid, and to provide a new type of special-purpose heavy oil production fluid reverse-phase demulsifier and its preparation method

Method used

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  • Reverse demulsifier for heavy oil produced fluid and preparation method of reverse demulsifier
  • Reverse demulsifier for heavy oil produced fluid and preparation method of reverse demulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the synthesis of inverse demulsifier a

[0020] (1) Synthesis of cationic modified polyvinyl alcohol

[0021] At room temperature, slowly add 2,3-epoxypropyltrimethylammonium chloride dropwise to the aqueous solution of polyvinyl alcohol with a molecular weight of 1000. After the addition, add NaOH aqueous solution as a catalyst, and stir the reaction at 50°C for 3h . After the reaction, adjust the pH value of the system to 7-8 with dilute hydrochloric acid to obtain cation-modified polyvinyl alcohol a-1; polyvinyl alcohol, 2,3-epoxypropyltrimethylammonium chloride and The amounts of NaOH added were 20 g, 4 g and 0.23 g, respectively.

[0022] (2) Synthesis of epichlorohydrin-diethylamine polymer

[0023] At room temperature, first add epichlorohydrin, slowly add diethylamine under stirring, dropwise, then add crosslinking agent diethylenetriamine, stir and react at 70°C for 5h, and purify the obtained product with absolute ethanol-acetone , the precip...

Embodiment 2

[0028] Embodiment 2: the synthesis of inverse demulsifier b

[0029] (1) Synthesis of cationic modified polyvinyl alcohol

[0030] At room temperature, slowly add 2,3-epoxypropyltrimethylammonium chloride dropwise to the aqueous solution of polyvinyl alcohol with a molecular weight of 1500. After the addition, add NaOH aqueous solution as a catalyst, and stir the reaction at 55°C for 4h . After the reaction, adjust the pH value of the system to 7-8 with dilute hydrochloric acid to obtain cation-modified polyvinyl alcohol b-1; polyvinyl alcohol, 2,3-epoxypropyltrimethylammonium chloride and The added amounts of NaOH were 20 g, 3 g and 0.69 g, respectively.

[0031] (2) Synthesis of epichlorohydrin-diethylamine polymer

[0032] At room temperature, first add epichlorohydrin, slowly add diethylamine under stirring, after the dropwise addition, add the crosslinking agent triethylenetetramine, stir and react at 75°C for 6h, and purify the obtained product with absolute ethanol-a...

Embodiment 3

[0037] Embodiment 3: the synthesis of inverse demulsifier c

[0038] (1) Synthesis of cationic modified polyvinyl alcohol

[0039] At room temperature, slowly add 2,3-epoxypropyltrimethylammonium chloride dropwise to the aqueous solution of polyvinyl alcohol with a molecular weight of 2000. After the addition, add NaOH aqueous solution as a catalyst, and stir the reaction at 60°C for 5h . After the reaction, adjust the pH value of the system to 7-8 with dilute hydrochloric acid to obtain cation-modified polyvinyl alcohol c-1; polyvinyl alcohol, 2,3-epoxypropyltrimethylammonium chloride and The amounts of NaOH added were 20 g, 4.5 g and 1.23 g, respectively.

[0040] (2) Synthesis of epichlorohydrin-diethylamine polymer

[0041] At room temperature, first add epichlorohydrin, then slowly add diethylamine under stirring, after the dropwise addition, add the crosslinking agent tetraethylenepentamine, stir and react at 80°C for 7 hours, and purify the obtained product with abso...

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Abstract

The invention relates to a reverse demulsifier for heavy oil produced fluid and a preparation method of the reverse demulsifier. The method comprises the following steps: (1) polyvinyl alcohol and 2,3-epoxy propyl trimethyl ammonium chloride are subjected to a reaction under the condition of alkali catalysis, and comb-type cation modified polyvinyl alcohol is obtained; (2) diethylamine and epichlorohydrin are subjected to a polymerization reaction in the presence of a crosslinking agent polyethylene polyamine, and a quaternary ammonium salt type epichlorohydrin-diethylamine polymer is obtained; (3) zinc hydroxide and acrylamide are subjected to a polymerization reaction in an oxidation-reduction initiation system, and hybrid zinc-based polyacrylamide is obtained; (4) cationic modified polyvinyl alcohol, an ethylene oxide-diethylamine polymer, hybrid zinc-based polyacrylamide and water are mixed, and the reverse demulsifier is obtained. The reverse demulsifier has good demulsification and oil-water separation effects on heavy oil or oil sand produced fluid produced with a steam thermal recovery process; besides, the preparation method has the characteristics that operation is simple, and requirements for equipment are low.

Description

Technical field: [0001] The invention belongs to the technical field of crude oil exploitation, especially steam thermal exploitation of heavy oil or oil sand, and in particular relates to an inverse demulsifier for heavy oil production fluid and a preparation method thereof. Background technique: [0002] The global recoverable reserves of heavy oil are about 400 billion tons, which is 2.7 times the recoverable reserves of conventional crude oil (150 billion tons). After more than 20 years of development, the annual output of heavy oil and tar sands has increased from 20 million tons to nearly 100 million tons. More than 70 heavy oil fields have been discovered onshore in China, with a total geological reserve of about 1.2 billion cubic meters. The annual production has increased from 1 million tons in 1985 to 13 million tons, accounting for 9% of the total onshore crude oil production. The cumulative production has exceeded 100 million tons. Tons; heavy oil in offshore oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08F8/44C08F16/06C08G65/26C08F120/56C08F4/40
CPCC08F4/40C08F8/44C08F120/56C08G65/2624C10G33/04C10G2300/1033C08F16/06
Inventor 丁秋炜王素芳李志元徐慧丁舒林蓓于晓微滕厚开
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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