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Emulsion breaker for dehydration of crude oil extracted from acidified oil well

A crude oil dehydration and demulsifier technology, which is applied in the field of crude oil dehydration demulsifier and oil production chemical agent after acidification, and can solve the problems of high conductivity and exceeding the safe working conductivity of electric dehydrators.

Active Publication Date: 2011-10-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the conductivity of acid-containing crude oil (water-in-oil emulsion) is too high, exceeding the safe working conductivity κw of the electric dehydrator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: The weight percentage of each component of the crude oil dehydration demulsifier used in the oil well produced after acidification is:

[0041] 1. Tristyrene phenol polyoxypropylene (7) polyoxyethylene (30) ether: 3.5%;

[0042] 2. Phenethyl phenyl polyoxypropyl polyoxyethyl ether: 3.5%;

[0043] 3. Toluene diisocyanate polyether crosslinked product: 6.7%;

[0044] 4. Nonylphenol polyoxyethylene (30) ether: 6.5%;

[0045] 5. Dodecylamine polyoxyethylene (10) ether: 2.0%;

[0046] 6. Rosin amine polyoxypropylene polyoxyethylene ether: 35.5%;

[0047] 7. Sodium hydroxide: 0.25%;

[0048] 8. Urotropine: 0.12%;

[0049] 9. Vitamin C: 0.05%;

[0050] 10. Methanol: 15%;

[0051] 11. The rest is water (26.88%), and the total weight percentage of each component is 100%.

[0052] Preparation of this embodiment: First, tristyrene phenol polyoxypropylene (7) polyoxyethylene (30) ether, phenethyl phenyl polyoxypropyl polyoxyethyl ether, toluene diisocyanate polyether crosslinked product,...

Embodiment 2

[0054] Example 2: The weight percentage of each component of the crude oil dehydration demulsifier used in the oil well produced after acidification is:

[0055] 1. Tristyrenic phenol polyoxypropylene (7) polyoxyethylene (30) ether: 3.7%;

[0056] 2. Phenethyl phenyl polyoxypropyl polyoxyethyl ether: 3.4%;

[0057] 3. Toluene diisocyanate polyether cross-linked product: 6.9%;

[0058] 4. Nonylphenol polyoxyethylene (30) ether: 6.3%;

[0059] 5. Dodecylamine polyoxyethylene (10) ether: 1.9%;

[0060] 6. Rosin amine polyoxypropylene polyoxyethylene ether: 36%;

[0061] 7. Sodium hydroxide: 0.25%;

[0062] 8. Urotropine: 0.14%;

[0063] 9. Vitamin C: 0.055%;

[0064] 10. Methanol: 15.5%;

[0065] 11. The rest is water (25.755%), and the total weight percentage of each component is 100%.

[0066] The preparation method is the same as in Example 1.

[0067] Example 2 In the case of the trial addition of 68mg / l in Jingyi Joint Station, the water content of crude oil after removal was less than 0.35%,...

Embodiment 3

[0068] Example 3: The weight percentage of each component of the crude oil dehydration demulsifier used in the oil well produced after acidification is:

[0069] 1. Tristyrene phenol polyoxypropylene (7) polyoxyethylene (30) ether: 3.9%;

[0070] 2. Phenethyl phenyl polyoxypropyl polyoxyethyl ether: 3.2%;

[0071] 3. Toluene diisocyanate polyether crosslinked product: 7.1%;

[0072] 4. Nonylphenol polyoxyethylene (30) ether: 6%;

[0073] 5. Dodecylamine polyoxyethylene (10) ether: 1.8%;

[0074] 6. Rosin amine polyoxypropylene polyoxyethylene ether: 36.5%;

[0075] 7. Sodium hydroxide: 0.25%;

[0076] 8. Urotropine: 0.16%;

[0077] 9. Vitamin C: 0.055%;

[0078] 10. Methanol: 16%;

[0079] 11. The rest is water (25.035, the sum of the weight percentage of each component is 100%.

[0080] The preparation method is the same as in Example 1.

[0081] In Example 3, when the trial dosage at Zhaoyilian Station was 62mg / l, the water content of crude oil after removal was less than 0.2%, the oil conten...

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Abstract

The invention relates to an emulsion breaker for dehydration of crude oil extracted from an acidified oil well, which is applied to the treatment of crude oil in the oil extraction field. The emulsion breaker comprises the following components by weight percent: 3.5 to 4.5% of triphenylethylene phenol polyoxypropylene (7) polyoxyethylene (30) ether, 3.0 to 3.5% of phenethyl phenyl polyoxypropylene polyoxyethylene ether, 6.7 to 7.4% of toluene diisocynate polyether crosslinked product, 5.0 to 6.5% of nonylphenol polyoxyethylene (30) ether, 1.5 to 2.0% of dodecyl primary amine polyoxyethylene (10) ether, 35.5 to 38.0% of rosin amine polyoxypropylene polyoxyethylene ether, 0.25 to 0.3% of sodium hydroxide, 0.12 to 0.20% of urotropine, 0.05 to 0.065% of vitamin C, 15 to 17% of methyl alcohol and the balance of water, wherein the sum of the weight percentage of all the components is of one hundred percent. The emulsion breaker has the beneficial effects that: in the condition of dosage of 50 to 80mg / l, after the crude oil is dehydrated, the water content is less than 0.5% and the oil content is less than 300mg / I; and water is clear. The emulsion breaker reaches the industry regulation standard.

Description

Technical field [0001] The invention relates to the technical field of oil production in oil fields, in particular to an oil production chemical agent, which is a dehydration demulsifier for crude oil produced in an oil well after acidification. Background technique [0002] At present, some oil wells in the oilfield need to be acidified and put into production. After draining the acid, the produced liquid enters the joint station for treatment. During the electric dehydration process, the electric dehydrator frequently trips. Comparative analysis of the electric conductivity of the crude oil produced by the acidified oil well and the crude oil in adjacent blocks. The reason for the trip of the electric dehydrator is that although the water content of the crude oil produced by the oil well after acidification is very low (<1%), the conductivity is high, and the working current of the electric dehydrator exceeds the rated value, so the trip occurs. [0003] Fan Zhenzhong pointed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
Inventor 付亚荣吴泽美刘春平孙玉民龙政军李冬青付茜付丽霞徐茂桐文云飞徐定光姜一超李小永
Owner PETROCHINA CO LTD
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