Condensate oil emulsion de-emulsifier and applications thereof

A technology of demulsifier and condensate oil, which is applied in the field of demulsification in condensate oil emulsion, to achieve the effects of low demulsification temperature, fast demulsification speed and good oil and water quality

Active Publication Date: 2015-05-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the cationic corrosion inhibitor commonly used in acid gas fields, the invention provides a demulsifier formula with fast demulsification speed and good demulsification effect at normal temperature through compounding, and solves the problem of corrosion inhibition in acid gas fields producing condensate oil. Recovery of condensate oil after treatment

Method used

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  • Condensate oil emulsion de-emulsifier and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The demulsifier is prepared by 10% branched chain dodecylbenzene sulfonate, 8% polyoxypropylene polyoxyethylene glycol ether, 30% ethylene glycol butyl ether, and 52% deionized water. At 5°C, use a stopper measuring cylinder to take 40mL of on-site water samples with a salinity of 1.58g / L and 10mL of on-site condensate oil samples, add 0.1g (2000ppm) of cationic quaternary ammonium salt corrosion inhibitors, shake vigorously up and down for 50 times to make milk, and then add 0.05g demulsifier (1000ppm), shake 10 times and let it stand, the demulsification rate is 98% in 10 minutes.

Embodiment 2

[0017] The demulsifier is prepared by 7% branched dodecylbenzene sulfonate, 15% polyoxypropylene polyoxyethylene glycol ether, 10% isopropanol, and 68% deionized water. At 20°C, use a stopper measuring cylinder to take 40mL of on-site water samples with a salinity of 0.22g / L, and 10mL of on-site condensate oil samples. 0.05g demulsifier (1000ppm), shake 10 times and let stand, the demulsification rate measured 10min is 96%.

Embodiment 3

[0019] The demulsifier is prepared by 5% branched dodecylbenzene sulfonate, 20% polyoxypropylene polyoxyethylene glycol ether, 20% ethanol, and 55% deionized water. At 5°C, use a stopper measuring cylinder to take 80mL of on-site water samples with a salinity of 0.22g / L, and 20mL of on-site condensate oil samples, add 0.2g (2000ppm) of cationic quaternary ammonium salt corrosion inhibitors, and shake vigorously up and down for 50 times to make milk. Add 0.05g demulsifier (500ppm), shake it for 10 times and let it stand still. The demulsification rate is 96% in 10 minutes.

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Abstract

The invention relates to a condensate oil emulsion de-emulsifier and applications thereof. The de-emulsifier is composed of the following components in percentage by weight: 5 to 10% of a benzene sulfonate anionic surfactant (branched sodium dodecyl benzene sulfonate), 5 to 20% of polyether nonionic surfactant (polyoxypropylene-polyoxyethylene-glycol ether), 10 to 30% of low-molecular-weight alcohol, which is one of ethylene glycol-butyl ether, ethanol, and isopropanol, and the balance being water. The de-emulsifier is applied to acidic gas fields producing condensate oil and is used to de-emulsifying emulsion, which is produced by using a cation-type corrosion inhibitor. The application concentration of the de-emulsifier by the production amount of the oil and water is 50 to 1000 ppm, the de-emulsifying temperature is 0 to 40 DEG C, and the de-emulsifying rate is not less than 95% within 10 minutes. The provided de-emulsifier has the characteristics of low de-emulsifying temperature, quick de-emulsifying speed, low mineral degree of applicable water, and good oil quality after de-emulsification.

Description

technical field [0001] The invention relates to the field of demulsification of an emulsion formed by using a cationic corrosion inhibitor in an acid gas field producing condensate oil, and relates to the demulsification application of a demulsifier formula in a condensate oil emulsion produced by using a cationic corrosion inhibitor. Background technique [0002] In the production of sour gas fields, it is necessary to add corrosion inhibitors to protect the oil and casing from corrosion, while in sour gas fields producing condensate oil, condensate oil and formation water will form a relatively stable emulsion under the action of corrosion inhibitors . The formed emulsion brings difficulties to the separation and recovery of condensate oil. On the one hand, it will affect the efficiency of the oil-water separation device, cause equipment blockage, and reduce the recovery rate of condensate oil. In severe cases, it will affect the normal production of the gas field; on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 蒋泽银刘友权石晓松陈楠苏福燕刘爽
Owner PETROCHINA CO LTD
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