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Low-temperature demulsifier for dehydration of produced liquid by polymer flooding and preparation method thereof

A demulsifier and produced fluid technology, which is applied to the components and preparation of low temperature demulsifier for crude oil dehydration in polymer flooding produced fluid, and the field of crude oil dehydration treatment agent, which can solve the problem that the water content of crude oil emulsion increases, cannot be reached, and increases broken Emulsion dosage and other issues, to achieve the effect of anti-static sterilization, strong dehydration ability, and good washing and conditioning

Active Publication Date: 2009-11-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer flooding leads to a variety of polymer components in the crude oil production fluid, which causes a sharp increase in the water content of the crude oil emulsion. In particular, the presence of chemical oil displacement agents makes the stability of the crude oil emulsion better and better. The difficulty of dehydration increases, and the existing demulsifiers are far from meeting the needs of demulsification and dehydration of high water content crude oil, heavy oil, and waxy crude oil
Some people increase the amount of demulsifier or increase the temperature of the demulsification process, but the dehydration speed and dehydration effect of these methods are not ideal
When the production fluid dehydration demulsifier is added in an amount of 50-70mg / l at 50-55℃, the water content of the crude oil after dehydration is less than 0.5%, and the oil content of the sewage is less than 300mg / l; but it still cannot meet the national energy-saving and emission-reduction standards.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: The weight percentages of each component of the polymer flooding crude oil production fluid dehydration low-temperature demulsifier are respectively:

[0040] 1. Demulsifier SAP1187 (industrial product): 16%;

[0041] 2. Demulsifier PFA311 (industrial product): 25%;

[0042] 3. Demulsifier 101 (industrial product): 12%;

[0043] 4. Alkyl amidopropyl betaine (industrial product): 0.05%;

[0044] 5. Ferrous chloride (industrial product): 0.05%;

[0045] 6. Vitamin C (industrial product): 0.06%;

[0046] 7. Fluorocarbon surfactant FN-3 (industrial product): 0.09%;

[0047] 8. Water: 46.75%.

[0048] Preparation:

[0049] First, add demulsifier SAP1187, demulsifier PFA311 and demulsifier 101 into the enamel reaction kettle in proportion. Slowly raise the temperature to 62°C. Secondly, add 5% of the total amount of water under constant stirring, and then continue to stir for 30 minutes, then add alkylamidopropyl betaine and vitamin C in proportion while st...

Embodiment 2

[0051] Embodiment 2: The preparation method is the same as in Embodiment 1, and the weight percentages of each component of the dehydration low-temperature demulsifier for crude oil production fluid produced by polymer flooding are:

[0052] 1. Demulsifier SAP1187 (industrial product): 19%;

[0053] 2. Demulsifier PFA311 (industrial product): 22%;

[0054] 3. Demulsifier 101 (industrial product): 13%;

[0055] 4. Alkyl amidopropyl betaine (industrial product): 0.06%;

[0056] 5. Ferrous chloride (industrial product): 0.05%;

[0057] 6. Vitamin C (industrial product): 0.06%;

[0058] 7. Fluorocarbon surfactant FN-3 (industrial product): 0.1%;

[0059] 8. Water: 45.73%.

[0060] Effect: When the dehydration temperature of the produced fluid of polymer flooding is 41°C, and the addition amount of low-temperature demulsifier for the dehydration of the produced fluid of polymer flooded crude oil is 57 mg / l, the water content of the dehydrated crude oil is less than 0.2%, and t...

Embodiment 3

[0061] Embodiment 3: The preparation method is the same as in Embodiment 1, and the weight percentages of each component of the dehydration low-temperature demulsifier for crude oil production fluid produced by polymer flooding are:

[0062] 1. Demulsifier SAP1187 (industrial product): 20%;

[0063]2. Demulsifier PFA311 (industrial product): 21%;

[0064] 3. Demulsifier 101 (industrial product): 14%;

[0065] 4. Alkyl amidopropyl betaine (industrial product): 0.07%;

[0066] 5. Ferrous chloride (industrial product): 0.06%;

[0067] 6. Vitamin C (industrial product): 0.07%;

[0068] 7. Fluorocarbon surfactant FN-3 (industrial product): 0.11%;

[0069] 8. Water: 44.69%.

[0070] Effect: When the dehydration temperature of the produced fluid of polymer flooding is 43°C, and the addition of low-temperature demulsifier for the dehydration of the produced fluid of polymer flooded crude oil is 65mg / l, the water content of the dehydrated crude oil is less than 0.2%, and the separ...

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PUM

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Abstract

A low-temperature demulsifier for dehydration of produced liquid by polymer flooding in the oil field is characterized in that the demulsifier comprises the following components according to the weight percentage: 15.0-25% of demulsifier SAP 1187; 17-25% of demulsifier PFA311; 12-16% of demulsifier 101; 0.04-0.1% of alkyl amidopropyl betaine; 0.05-0.08% of iron dichloride; 0.06-0.09% of Vitamin C; 0.08-0.15% of fluorocarbon surfactant FN-3 and the balance of water. The invention has the following effects: when the temperature of produced liquid by polymer flooding is 40 DEG C and the dosage is 50-70mg / l, the water content of the dehydrated crude oil is less than 0.2% and the oil content of the separated sewage is less than 500mg / l.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, and relates to a crude oil dehydration treatment agent, in particular to a component of a crude oil dehydration low-temperature demulsifier for polymer flooding production fluid and a preparation method thereof. Background technique [0002] Many oilfields in China have entered the late stage of development, and crude oil production has entered a period of high water cut. In order to increase the sweep coefficient of the oil layer in the late stage of oilfield development, obtain some recoverable reserves, and increase the recovery rate of crude oil, mining technicians have adopted steam flooding, polymer flooding, surface Enhanced oil recovery technologies such as active agent flooding and ASP flooding. There are many ways to use polymer flooding. For example, polymer flooding methods such as weak gel control and flooding have been carried out in some oil fields...

Claims

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Application Information

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IPC IPC(8): C10G33/04
Inventor 付丽霞付亚荣李造吉李冬青吴泽美解宏伟蒲祥金蔡远红游靖杨中锋牛宝歧陈宝新孟威姚为有
Owner PETROCHINA CO LTD
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