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Solid type crude oil demulsifier and preparation method and application thereof

A crude oil demulsifier and body type technology, applied in the direction of chemical dehydration/demulsification, etc., can solve the problems of difficult demulsification of heavy oil, lower demulsification efficiency, general penetration and diffusion performance, etc., and achieve significant demulsification and dehydration performance, The effect of improving demulsification efficiency and demulsification performance

Active Publication Date: 2019-10-18
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the polyether demulsifiers currently studied often have disadvantages such as small molecular weight, difficult demulsification of heavy oil, uneven diffusion, slow demulsification speed, and low dehydration rate.
For example, the demulsifiers provided by CN103146418A and CN102746470A are end-capped and modified with unsaturated acids such as acrylic acid, and the molecular weight is small; CN1537924A uses water-soluble cross-linking agents to synthesize demulsifiers, and the obtained products cannot be oil-soluble, and the demulsification effect is not as good as that of oil-soluble demulsifiers. Good emulsion; CN102676209A uses dicarboxylic acid to cross-link and modify the intermediate molecule of demulsifier, but its penetration and diffusion performance in heavy oil is average, which reduces the demulsification efficiency

Method used

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  • Solid type crude oil demulsifier and preparation method and application thereof
  • Solid type crude oil demulsifier and preparation method and application thereof
  • Solid type crude oil demulsifier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 provides a method for preparing a bulk crude oil demulsifier, including the following steps:

[0059] (1) Preparation of initiator R

[0060] Add 300kg of xylene, 700kg of polyvinyl polyamine, and 90kg of molten phenol to a dry and clean electric heating reactor. The temperature is increased to 50℃~60℃, and the mixture is stirred until the state is uniform; Add 240kg of formaldehyde solution with 37% content and control the dripping time for 0.5h~1h. After the dripping is completed, keep the reaction for 2h; then increase the temperature to 120℃~130℃ and continue the constant temperature reaction for 2h, continue to increase the temperature to 150℃~160℃, Reflux dehydration for 6 hours until no water is removed, continue to heat up to 220 ℃ ~ 240 ℃, dehydration and solvent removal for 4 hours until no liquid is removed, and cool down to 100 ℃ ~ 110 ℃ to obtain body resin initiator R, which is transferred to the kettle for later use.

[0061] (2) Preparation of interm...

Embodiment 2

[0066] Example 2 provides a bulk crude oil demulsifier prepared in Example 1. The bulk crude oil demulsifier is a polymer having the following structural formula:

[0067]

[0068] In the formula, the structural formula of Y is as follows:

[0069]

[0070] In the formula, R'is the R in the following formula to remove active hydrogen:

[0071]

[0072] Where: n 1 Take 1~30, n 2 Take 1 to 5; among them, the active hydrogen on R includes the hydrogen on the phenyl hydroxyl group and the amino hydrogen on the polyvinyl polyamine structure.

[0073] The molecular weight of the obtained polymer is 8000~10000, and the density is 1.00-1.02g / cm 3 , PH value is 7-9, flash point ≥50℃; its appearance is dark yellow viscous uniform liquid, no mechanical impurities, solid content ≥95%; viscosity<300mPa.s, freezing point ≤-35℃, absolute dehydration rate ≥93%.

[0074] In the polymer represented by the above formula, the structure with subscripts x and y is derived from the raw material polyethylene ...

Embodiment 3

[0075] Example 3 Crude oil demulsification experiment

[0076] The above-mentioned crude oil demulsifier is denoted by the code name DST, and the demulsification performance test is carried out. Six kinds of agents with good indoor evaluation effects and on-site agents are selected, and the experiments are carried out under the same temperature and different dosage conditions. Among them, the crude oil sample comes from the Le'an Joint Station, the water content of the oil sample is 30%, the dehydration temperature is 75°C, and the test results obtained are Table 1:

[0077] Table 1 Comparison of the demulsification effect of the bulk crude oil demulsifier provided by the present invention and other demulsifiers at different dosages

[0078]

[0079] Note: The agent used on site is LALP.

[0080] It can be seen from Table 1 that the bulk crude oil demulsifier provided by the present invention has a fast dehydration speed, an oil-water interface is uniform, and the extracted water is c...

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Abstract

The invention provides solid type crude oil demulsifier. The solid type crude oil demulsifier is prepared by adopting the following steps that (1) starting agent is prepared: polyethylene polyamine, phenol and methanol are mixed and then successively heated, refluxed and dehydrated from water and solvent, and cooled to obtain the starting agent; (2) an intermediate is prepared: alkali powder is added to the starting agent, epoxypropane and oxirane are successively added under vacuum, reaction is conducted under 120DEG C-140DEG C for 4-6h, and the intermediate is obtained by cooling; and (3) the demulsifier is prepared: bisphenol A type epoxy resin is added to the intermediate and reaction is conducted under 75DEG C-90DEG C for 4-6h, and the demulsifier is obtained by cooling. According tothe solid type crude oil demulsifier, a solid type structural final product can be obtained, the molecular weights of final demulsifier products are increased, at the same time, the penetration and diffusion of demulsifier molecule in heavy oil can be further enhanced, the diffusion time of the demulsifier is shortened, and the demulsification performance of demulsifier products is improved.

Description

Technical field [0001] This application relates to the field of petrochemical technology, in particular to a bulk crude oil demulsifier and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of oilfields, the oilfields are gradually aging, the water content in the extracted crude oil is getting higher and higher, and some crude oil has even changed to heavy. In order to increase the oil recovery rate, each oil area adopts different enhanced oil recovery technologies according to the formation characteristics, such as alkaline flooding, acid fracturing operations, foam flooding, polymer flooding, steam flooding, surfactant flooding, surfactant-polymer two The application of these technologies, such as yuan flooding and alkali-surfactant-polymer ternary combination flooding, provides effective measures for stabilizing and increasing oilfield production, and has achieved huge economic benefits. However, due to the implementa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08G81/00C08G65/26
CPCC08G65/2624C08G81/00C10G33/04
Inventor 崔学章崔仕章王黎明于长禄谷之辉徐丽君吴丽丽刘骁
Owner DESHI ENERGY TECH GRP CO LTD
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