Cation crude oil pre-dehydrating agent and method of preparing the same

A cationic and pre-dehydration technology, which is applied in the direction of dehydration/demulsification by chemical methods, can solve the problems of increased production cost, poor demulsification ability, increasing the amount of demulsifier, etc., and achieve the effect of reducing operating costs

Active Publication Date: 2009-10-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional nonionic surfactants have poor demulsification ability and slow dehydration speed
The solution is to increase the amount of demulsifier and increase the dehydration temperature, which will increase the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: the weight percent of each component of cationic crude oil pre-dehydrating agent is:

[0032] Cationic polyacrylamide (industrial product): 1.1%;

[0033] N, N-polyoxyethylene rosin RAXEO (industrial product): 19%;

[0034] Polyoxyethylene sorbitan trioleate (industrial product): 10%;

[0035] Water: 69.9%.

[0036] Preparation:

[0037] First, add cationic polyacrylamide into the enamel reaction kettle according to the above ratio. Add 25% of the amount of water used under constant stirring, and continue stirring for 30 minutes, then add N, N-polyoxyethylene rosin RAXEO, polyoxyethylene sorbitan trioleate (emulsifier T-85) in proportion , Stir while adding, and slowly heat up to 43 ° C, after stirring for 60 minutes, finally add the remaining water in proportion, stir for 30 minutes to stop heating, stir while cooling, and cool to room temperature. A cationic crude oil pre-dehydrating agent is obtained.

[0038] Effect: The daily liquid production i...

Embodiment 2

[0039] Embodiment 2: preparation method is identical with embodiment 1, and each component weight percent of cationic crude oil pre-dehydrating agent is:

[0040] Cationic polyacrylamide (industrial product): 1.3%;

[0041] N, N-polyoxyethylene rosin RAXEO (industrial product): 20%;

[0042] Emulsifier T-85 (industrial product): 9%;

[0043] Water: 69.7%.

[0044] Effect: The daily liquid production in an oilfield is 1700m 3 About 92.7% comprehensive water content, only use demulsifier dosing concentration of 55mg / l; add 13.5mg / l cationic crude oil pre-dehydrating agent in the first stage of dehydration to treat the crude oil into crude oil with water content less than 20%, and dehydrate in the second stage When adding 6mg / l demulsifier, the water content of crude oil is less than 0.3%, and the oil content in water is less than 200mg / l.

Embodiment 3

[0045] Embodiment 3: preparation method is identical with embodiment 1, and each component weight percent of cationic crude oil pre-dehydrating agent is:

[0046] Cationic polyacrylamide (industrial product): 1.5%;

[0047] N, N-polyoxyethylene rosin RAXEO (industrial product): 22%;

[0048] Polyoxyethylene sorbitan trioleate (industrial product): 8%;

[0049] Water: 68.5%.

[0050] Effect: The daily fluid production in an oilfield is 2100m 3 About 94.9% comprehensive water content, only use demulsifier dosing concentration of 43mg / l; add 15.5mg / l cationic crude oil pre-dehydrating agent in the first stage of dehydration to treat the crude oil into crude oil with water content less than 20%, and dehydrate in the second stage When adding 4mg / l demulsifier, the water content of crude oil is less than 0.2%, and the oil content in water is less than 200mg / l.

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Abstract

Cation crude oil pre-dehydrating agent applied in oilfield fluid dehydration. The characteristic is: each component weight percentage as: cation polyacrylamide 1.0-2.0%; N, N-polyoxyethylene rosin RAXEO 18-24%; polyoxyethylene sorbitol anhydride triolein 6-10%; the rest is water. The results are: apply the cation pre-dehydrating agent to use with demulsifier, use with the demulsifier at a amount of 10-20 mg / l to make water in the crude oil is less than 0.5% and water in sewerage is less than 500 mg / l, being able to reduce operating cost.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, in particular to the technical field of chemical dehydration of oil field crude oil. It is a formula of a cationic crude oil pre-dehydrating agent and a preparation method thereof. Background technique [0002] After the mining of old oilfields has entered the period of ultra-high water cut, the water content of the produced fluid has been increasing year by year, and the comprehensive water cut has exceeded 90%. The produced crude oil generally exists in the form of emulsion, which needs to be demulsified and separated before it can meet the requirements for export. Generally, the settling time in a thermochemical settling tank at 55°C is as long as 48h. There are disadvantages such as long dehydration treatment cycle, high heat energy consumption, high production fluid treatment cost, high water content of exported crude oil and high oil content of treated sew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04C08L93/04C08L33/26
Inventor 付亚荣李造吉吴泽美付丽霞李冬青付森解宏伟蒲祥金蔡远红游靖牛宝歧陈宝新孟威姚为有王军峰
Owner PETROCHINA CO LTD
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