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Quantitative evaluation system and method of crude oil emulsion stability

A quantitative evaluation and emulsion technology, applied in the field of quantitative evaluation system of crude oil emulsion stability, can solve the problems of unfavorable reading, insufficient representativeness of water droplet size distribution results, complicated operation, etc., and achieve the effect of convenient and quick use.

Inactive Publication Date: 2015-12-16
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The evaluation system and method obviously have the following deficiencies: First, the evaluation method combining digital photomicrographs and image processing is not only relatively complicated in operation, but also affected by many human factors in the process of micro sampling and observation, the particle size of water droplets The representativeness of the distribution results is slightly insufficient; the second is that the digital photomicrograph technology is not suitable for the real crude oil emulsion with poor light transmission; the third is that the electrostatic coalescer adopts a flat-bottomed cylindrical structure design, which is not conducive to The reading of the volume of a small amount of water phase at the bottom, the reliability of the dehydration rate calculation results is poor

Method used

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  • Quantitative evaluation system and method of crude oil emulsion stability
  • Quantitative evaluation system and method of crude oil emulsion stability
  • Quantitative evaluation system and method of crude oil emulsion stability

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specific Embodiment approach

[0027] The quantitative evaluation system of crude oil emulsion stability of the present invention, its preferred embodiment is:

[0028] Including signal generator, oscilloscope, voltage amplifier, bottle test demulsifier, constant temperature water bath, emulsion test bottle, dynamic stability analyzer, computer, etc.;

[0029]Electric field demulsification or chemical demulsification by the above systems:

[0030] The electric field demulsification includes: the signal generator generates electrical signals with specific waveforms, voltage values ​​and frequencies, and after the signal is amplified by a voltage amplifier, a non-uniform high-strength The electric field makes the water particles in it electrostatically coalesce, and then accelerates the gravity sedimentation;

[0031] The chemical demulsification includes: directly adding a demulsifier to the crude oil emulsion in the bottle test type demulsification dehydrator for chemical demulsification without applying a...

specific Embodiment

[0059] Such as figure 1 , figure 2 , image 3As shown, the quantitative evaluation system for the stability of crude oil emulsion consists of a signal generator (1), an oscilloscope (2), a voltage amplifier (3), a bottle test demulsifier (6), a constant temperature water bath (7), an emulsifying A liquid test bottle (8), a dynamic stability analyzer (9), a computer (10), etc., a signal generator (1), an oscilloscope (2), and a voltage amplifier (3) together constitute a high-voltage power supply and monitoring device. The bottle test type demulsifier (6) is generally a vertical structural layout of three cylinders coaxial with the center line. The innermost cone-bottomed measuring cylinder (15) is filled with the crude oil emulsion (20) to be tested. The middle annular space between the measuring cylinder (15) and the middle cylinder is filled with electrolyte solution (19), and the outer annular space between the middle cylinder and the cylindrical outer cylinder is filled...

Embodiment 1

[0061] Example 1: Evaluate the influence of different electric field parameters on the stability of crude oil emulsion.

[0062] 1. Pour the prepared same batch of crude oil emulsion (about 50ml) into the cone-bottom measuring cylinder (15) of the bottle test electrostatic coalescer (6), and rise to the set demulsification temperature under the action of a circulating water bath; then Turn on the high-voltage power supply and monitoring device, apply a high-intensity non-uniform electric field to the crude oil emulsion (20) in the cone-bottom measuring cylinder (15), so that the dispersed phase water particles in the crude oil emulsion (20) undergo electrostatic coalescence. After continuous power supply for about 1min, turn off the high-voltage power supply and monitoring device. Put the crude oil emulsion after the demulsification into rest for a period of time, and the detached water will settle at the bottom of the cone-bottomed measuring cylinder (15). Since the cone-bott...

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Abstract

The invention discloses a quantitative evaluation system and method of a crude oil emulsion stability. The system comprises a signal generator, an oscilloscope, a voltage amplifier, a bottle-test type demulsification dehydrator, a constant-temperature water bath, an emulsion test bottle, a kinetic stability analyzer and a computer, wherein the signal generator generates electric signals with a specific waveform, voltage and frequency, signal amplification is performed through the voltage amplifier, and then an asymmetric high-intensity electric field is applied to crude oil emulsion in the bottle-test type demulsification dehydrator to enable water particles therein to produce electrostatic coalescence and further to accelerate gravity settlement; or under the situation that no electric field is applied, a demulsification agent is directly added into the crude oil emulsion in the bottle-test type demulsification dehydrator to perform chemical demulsification; quantitative analysis and evaluation are performed on the demulsification effect by calculating emulsion dehydration rate or by using the kinetic stability analyzer. The evaluation system and method are convenient, quick, accurate and reliable to use, and can provide convenience for evaluation work of the emulsion demulsification effect under various conditions in laboratories and engineering fields.

Description

technical field [0001] The invention relates to a water-in-oil type (W / O type) or oil-in-water type (O / W type) emulsion breaking technology, in particular to a quantitative evaluation system and method for the stability of a crude oil emulsion. Background technique [0002] Crude oil extracted from the formation inevitably contains a large amount of water and salt, which has brought many negative effects on subsequent storage, transportation, refining and processing, etc. Therefore, it is generally necessary to dehydrate (salt) the crude oil in the oil field In the refinery, the crude oil must be desalted before entering the atmospheric and vacuum distillation unit. Water in crude oil mainly exists in three forms: dissolved water, emulsified water, and free water. Among them, emulsified water is relatively stable and difficult to remove by conventional static sedimentation methods. So far, people have done a lot of research on the problem of demulsification and dehydration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/49G01N15/04G01N15/02
Inventor 陈家庆张龙潘泽昊蔡小垒
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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