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Demulsifying dehydration method of oilfield produced liquid

A production fluid and oilfield technology, applied in the direction of chemical dehydration/emulsification, etc., to achieve the effect of wide application range, convenient industrial application, and simple operation

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another way is to develop new demulsifier products, but the disadvantage of this method is that with the replacement of emulsified viscosity reducers, demulsifiers also need to be updated continuously

Method used

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  • Demulsifying dehydration method of oilfield produced liquid
  • Demulsifying dehydration method of oilfield produced liquid
  • Demulsifying dehydration method of oilfield produced liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The water content of the production fluid is 20%, the addition of emulsifying viscosity reducer is 200ppm, and the demulsification aid is liquid polyaluminum chloride (product index: alumina content ≥ 10.0%, basicity 40.0%-85.0%, water insoluble content ≤0.5), the addition amount is 150ppm, the results are shown in Table 1.

[0029] Table 1

[0030]

Embodiment 2

[0036] The water content of the production fluid is 20%, the addition of emulsifying viscosity reducer is 300ppm, and the demulsification aid is liquid polyferric sulfate (product index: total iron content ≥ 11.0%, basicity 9.0%-14.0%, water insoluble content ≤ 0.3), addition 200ppm, the results are shown in Table 3.

[0037] table 3

[0038]

Embodiment 3

[0044] The water content of the production fluid is 30%, the addition of emulsifying viscosity reducer is 500ppm, and the demulsification aid is polyaluminum ferric chloride (product index: alumina content ≥ 27.0%, iron oxide content 3.0%-6.0%, basicity ≥ 70.0%, water-insoluble content≤0.75%), the addition amount is 500ppm, and the results are shown in Table 5.

[0045] table 5

[0046]

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Abstract

The invention relates to a demulsifying dehydration method of an oilfield produced liquid. The method comprises a step that emulsifying dehydration is carried out by mixing the oilfield produced liquid with a demulsifying assistant and a demulsifying agent, wherein the oilfield produced liquid contains an emulsified viscosity reducer, the demulsifying assistant comprises one or more of a polymeric aluminum flocculant, a polymeric iron flocculant and a metal-polysilicate flocculant, and the application amount of the demulsifying assistant is 50-10000pm on the basis of the quality of the oilfield produced liquid.

Description

technical field [0001] The invention relates to a method for demulsification and dehydration of oilfield production fluid. Background technique [0002] The heavy and inferior quality of crude oil is the trend of crude oil production in the world, and heavy oil resources account for a considerable proportion of the world's oil and gas resources. According to statistics, heavy oil and ultra-heavy oil account for more than 20% of the world's proven crude oil reserves. With the continuous reduction of light and easy-to-recover crude oil, the exploitation of heavy oil has increasingly attracted the attention of various countries. Heavy oil has high content of colloid and asphaltenes, high viscosity and poor fluidity, so it is very difficult to exploit and gather. The production technology using emulsified viscosity reducer can replace dilute crude oil for mining and transportation, and has the advantages of low energy consumption and less equipment investment. Chemical viscosit...

Claims

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Application Information

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IPC IPC(8): C10G33/04
Inventor 王振宇沈明欢秦冰罗咏涛于丽李本高
Owner CHINA PETROLEUM & CHEM CORP
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