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Composite coolant and preparation method thereof, and demulsification method of high-wax crude oil produced fluid

A composite cooling and production fluid technology, applied in the fields of hydrocarbon oil dehydration/demulsification, chemical instruments and methods, petroleum industry, etc., can solve problems that are not conducive to large-scale application on site, long time required, sensitive to parameter changes, etc.

Active Publication Date: 2013-03-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the ultrasonic method and the microwave method have dual functions of demulsification and emulsification, are sensitive to parameter changes, and have high operating costs, which are not conducive to large-scale application in the field
In addition, the membrane method and freeze-thaw method are also used in the demulsification of high-wax crude oil production fluid, but the membrane method has a small processing capacity and the membrane pores are easily blocked, which is not conducive to continuous production on site; the freeze-thaw method is only suitable for the continuous phase with high viscosity and The emulsification system rich in solid particles has a better effect, and it consumes a lot of energy and takes a long time. At present, there are few industrial applications

Method used

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  • Composite coolant and preparation method thereof, and demulsification method of high-wax crude oil produced fluid
  • Composite coolant and preparation method thereof, and demulsification method of high-wax crude oil produced fluid
  • Composite coolant and preparation method thereof, and demulsification method of high-wax crude oil produced fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This example is used to illustrate the preparation method of the composite coolant.

[0050] Preparation of condensation nuclei: spray the melted microcrystalline wax through a nozzle with a 1mm aperture, and then cool it in a cooling tower at -20°C for rapid cooling (the equivalent diameter of wax crystal particles produced under this condition is determined to be 0.3- 1.2mm); freeze the clay raw material (irregular shape) to -15°C, and crush it with a crusher until the equivalent diameter is between 0.1 and 1.5mm. According to the mass ratio of 2:1, the wax crystal particles and the clay particles are uniformly mixed to obtain mixed condensation nuclei.

[0051] Preparation of composite coolant: take 50g of the above-mentioned mixed condensation nuclei, spray atomized water on the condensation nuclei under stirring and dry ice cooling conditions, the diameter of the atomization nozzle is 1mm, and the water volume is 40g; add 100g, the equivalent diameter is 0.05 ~ 1.5...

Embodiment 2

[0053] Crude oil from an oilfield is low-sulfur-paraffinic, and its properties are shown in Table 1.

[0054] Table 1

[0055]

[0056] The water content of crude oil production fluid on site is 91.9%, and the temperature at the metering station is 47.5°C (environment temperature is 16°C). Part of the production fluid without additives (demulsifier and water treatment agent) is diverted from the metering station, and the compound coolant is added after exchanging heat with the reinjection water through the heat exchanger. The dosage of the composite coolant is 0.3% of the mass of the crude oil production fluid. %; in the composite coolant, the mass ratio of ice, coolant and condensation nuclei is 1:2:1; the equivalent diameter of the composite coolant is between 0.5 and 3.5mm, and the equivalent diameter of the coolant is 0.05 to 1.5mm The ammonium chloride in between, the condensation nucleus is a mixed system of wax crystals and clay particles with an equivalent diameter...

Embodiment 3

[0060] Crude oil from an oilfield is of sulfur-intermediate type, and its properties are shown in Table 2.

[0061] Table 2

[0062]

[0063] The moisture content of the produced fluid on site is 87.8%, and the temperature at the metering station is 51.5°C (environment temperature is 21°C). Part of the production fluid without adding agent (demulsifier) ​​is diverted from the metering station, and the compound coolant is added after exchanging heat with the reinjection water through the heat exchanger. The amount of the composite coolant is 0.4% of the mass of the crude oil production fluid; the composite cooling In the agent, the mass ratio of ice, coolant and condensation nuclei is 1:1.4:0.5; the equivalent diameter of the composite coolant is between 0.5 and 3.5mm, and the coolant is chlorine with an equivalent diameter between 0.05 and 1.5mm. A mixture of ammonium chloride and potassium nitrate particles, the mass ratio of ammonium chloride and potassium nitrate is 2:1...

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Abstract

The invention relates to a composite coolant and a preparation method thereof, and a high-wax crude oil produced fluid demulsification method based on the composite coolant. The demulsification method comprises the steps that: the crude oil produced fluid is mixed with the composite coolant; the mixture is subjected to standing, such that a hardened crude oil layer is formed on the surface layer of produced fluid; the hardened crude oil layer is crushed; and filtering is carried out, such that primary crude oil is obtained. With the demulsification method, no demulsifier is needed. The method is simple and feasible, and has the characteristics such as low cost, good oil-water separation effect, good universality, and substantially no influence on subsequent crude oil processing process.

Description

technical field [0001] The invention relates to a composite coolant, a preparation method thereof, and a demulsification method for high-wax crude oil production fluid based on the composite coolant. Background technique [0002] The freezing point of crude oil refers to the highest temperature corresponding to the loss of fluidity of crude oil under specified test conditions. There are two main reasons for the loss of crude oil fluidity: one is that the viscosity of crude oil will increase with the decrease of temperature; ". Crude oil is divided into low-condensation crude oil (freezing point below 0°C), easy-condensing crude oil (freezing point between 0°C and 30°C) and high-condensing crude oil (freezing point above 30°C) according to the freezing point. [0003] The wax content of crude oil is an important factor affecting the freezing point of crude oil. Generally, the higher the wax content, the higher the freezing point of crude oil. According to the wax content, ...

Claims

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Application Information

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IPC IPC(8): C09K5/06C10G33/00
Inventor 杨青高峰桑军强
Owner CHINA PETROLEUM & CHEM CORP