Dehydration method of oilfield produced fluid

A technology for produced fluids and oil fields, applied in the direction of dehydration/demulsification by chemical methods, can solve the problems of increasing the processing load of the sedimentation tank, the cost of chemicals, and the unsatisfactory effect, and achieve good demulsification effect, good bactericidal effect, and good effect. good effect

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of increasing demulsification and water separation time and / or increasing the amount of demulsifier is usually used to deal with the dehydration problem of emulsified viscosity-reducing produced fluid, but the effect is often unsatisfactory, and increasing the demulsification and water separation time and the amount of demulsifier will also increase Settling Tank Treatment Load and Chemical Cost

Method used

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  • Dehydration method of oilfield produced fluid
  • Dehydration method of oilfield produced fluid
  • Dehydration method of oilfield produced fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The water content of the produced fluid is 20%, the addition of the emulsifying viscosity reducer is 200ppm, and the demulsification aid is ethylene bis(tetradecyldimethylammonium chloride), and the addition is 30ppm. The results are shown in Table 1.

[0033] Table 1

[0034]

Embodiment 2

[0040] The water content of the produced fluid is 20%, the addition of emulsifying viscosity reducer is 300ppm, and the demulsification aid is propylene bis(dodecyl polyoxyethylene ammonium chloride), and the addition is 50ppm. The results are shown in Table 3.

[0041] The structural formula of the demulsifier is as follows:

[0042]

[0043] table 3

[0044]

Embodiment 3

[0050] The water content of the production fluid is 30%, the addition amount of the emulsifying viscosity reducer is 500ppm, and the demulsification aid is propylene bis(decyl polyoxyethylene / polyoxypropylene chloride / ammonium bromide), the addition amount is 100ppm, the results are shown in table 5.

[0051] The structure of the demulsifier is as follows:

[0052]

[0053] table 5

[0054]

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Abstract

The invention relates to a dehydration method of oilfield produced fluid. According to the invention, oilfield produced fluid, quaternary ammonium salt and a demulsifying agent are mixed, such that demulsification dehydration is carried out. The oilfield produced fluid contains an emulsification viscosity reducer. According to the mass of the oilfield produced fluid as a reference, the dosage of quaternary ammonium salt is 10-300ppm. The cation portion of the quaternary ammonium salt has a structure represented by the formula below. R1 and R2 can be the same or different, and R1 and R2 are C8-C22 alkyl or C8-C22 substituted alkyl; R4, R5, R6, and R7 can be the same or different, and R4, R5, R6, and R7 are C1-C4 alkyl, C1-C4 alkoxy, polyoxyethylene with polymerization degree of 1-20, or polyoxyethylene/polyoxypropylene with polymerization degree of 1-20; and R3 is C2-C8 alkylene or diethylene maleate.

Description

technical field [0001] The invention relates to a method for dehydrating oilfield production fluid. Background technique [0002] With the continuous reduction of light crude oil, heavy oil resources have attracted increasing attention from various countries. However, heavy oil has high colloid and asphaltene content, high viscosity, and poor fluidity, making it very difficult to exploit and collect. The emulsified viscosity-reducing mining technology can replace dilute crude oil for mining, gathering and transportation, and has the advantages of low energy consumption and equipment investment, and is gradually favored by people. [0003] The principle of emulsification viscosity reduction technology is to reduce the oil-water interfacial tension through the adsorption of emulsification viscosity reducer on the oil-water interface, so that the heavy oil can be transformed from the emulsified state of water-in-oil to the state of oil-in-water, thereby greatly reducing the vis...

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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