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Demulsifying dehydration method of oilfield produced fluid

A production fluid and oilfield technology, applied in chemical dehydration/demulsification, etc., can solve problems such as hysteresis, achieve good effect, less equipment investment, and strong surface activity

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

In addition, the development of new demulsifiers is also a solution, but this method has a certain degree of hysteresis and strong pertinence. With the replacement of emulsified viscosity reducers, demulsifiers also need to be constantly updated

Method used

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  • Demulsifying dehydration method of oilfield produced fluid
  • Demulsifying dehydration method of oilfield produced fluid
  • Demulsifying dehydration method of oilfield produced fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The water content of the produced fluid is 20%, the added amount of the emulsification viscosity reducer is 200 ppm, and the demulsification aid is dodecyl tributyl phosphorus chloride, and the added amount is 20 ppm. The results are shown in Table 1.

[0029] Table 1

[0030]

Embodiment 2

[0036] The water content of the produced fluid is 20%, the addition amount of the emulsification viscosity reducer is 300ppm, and the demulsification aid is tetradecyltriphenylphosphonium bromide, and the addition amount is 30ppm. The results are shown in Table 3.

[0037] table 3

[0038]

Embodiment 3

[0045] The water content of the produced fluid is 30%, the added amount of the emulsification viscosity reducer is 500 ppm, and the demulsification aid is dodecyloxymethyltributylphosphorus chloride, and the added amount is 50 ppm. The results are shown in Table 5.

[0046] table 5

[0047]

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Abstract

A demulsifying dehydration method of an oilfield produced fluid comprises a step that the demulsifying dehydration is carried out through mixing the oilfield produced fluid, a demulsifying assistant and a demulsifying agent. The oilfield produced fluid contains an emulsified viscosity reducer; the application amount of the demulsifying assistant is 10-200ppm on the basis of the quality of the oilfield produced fluid; and the demulsifying assistant has a structure represented by a general formula of [R1P<+>(R2)3]nX<n->, R1 is a C6-22 alkyl or alkoxy group, R2 is a C1-4 alkyl, hydroxyalkyl, phenyl, benzyl or tolyl group, n is an integer between 1 and 3, X is Cl<->, Br<-> or HCOO<-> when n is 1, X is SO4<2-> when n is 2, and X is PO4<3-> when n is 3.

Description

technical field [0001] The invention relates to a method for demulsification and dehydration of oil field produced fluid. Background technique [0002] 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 refers to crude oil with a viscosity greater than 50mPa.s at 50°C. According to the viscosity at 50°C, heavy oil can be further divided into ordinary heavy oil (50-10000mPa.s), extra-heavy oil (10000-50000mPa.s) and ultra-heavy oil. Oil (above 50000mPa.s). Heavy oil has high viscosity and poor fluidity, so its extraction, gathering and transportation are very difficult. Chemical viscosity reduction technology is of great significance to the exploitation and transportation of heavy oil, and emulsification viscosity reduction technology is one of them. [0003] Emulsifying viscosity reducers are mostly composed of surface-active main agents and auxiliary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
Inventor 沈明欢于丽王振宇余伟发秦冰李本高
Owner CHINA PETROLEUM & CHEM CORP
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