Demulsifier for eliminating aged oil mixture in oil-water interlayer in settling tank

Abstract

The invention discloses a demulsifier for eliminating an aged oil mixture in an oil-water interlayer in a settling tank. The demulsifier comprises the following components in parts by mass: 3-4 partsof fatty alcohol-polyoxyethylene ether, 6-7 parts of methanol, 75-80 parts of a functional main agent F, 2-3 parts of erucylamide propyl hydroxysulfobetaine and the balance of water. The demulsifier is applied to the treatment of eliminating the middle-layer aged oil mixture in a settling tank, and has good demulsification and dehydration treatment effects on combined treatment stations of different oil reservoirs and the middle-layer aged oil mixture at different depths in the settling tank. For treating an interlayer aged oil mixture, from the position 3.5 m in a settling tank of a certain combined treatment station, of which raw oil density is 0.8765 g / cm <3>, the viscosity is 54.7 mPa*S at the temperature of 50 DEG C, the content of colloid asphaltene is 54.3%, the wax content is 10.2%and the water content of the middle-layer aging oil mixture is 38.7%, 0.7% of the demulsifier is added at 60 DEG C according to the Petroleum and Natural Gas Industry Standard SY / T 5281-2000 of the People's Republic of China, and test results show that the average dehydration rate of the demulsifier in 30 min is 96.6%, and the average dehydration rate of the demulsifier after settlement for 6 h is 99.6%.

Description

technical field

[0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a demulsifier for eliminating the aged oil mixture in the oil-water intermediate layer in a settling tank. Background technique

[0002] With the continuous deepening of oil field development, on the one hand, in the case of water displacement medium for oil displacement, part of the relatively heavy crude oil that cannot be driven by conventional water and adsorbed on the pore surface of underground reservoirs relies on technology. Innovative technical means have been produced; on the other hand, along with the further improvement of the technical level of reservoir understanding, some low-quality and difficult-to-recover reserves with relatively poor physical properties of crude oil have been discovered and put into production. The composition of the produced fluid of these oil wells is complex and the content of heavy components is high. Due to the increase o...

Examples

Embodiment 1

[0027] Embodiment 1: be used to eliminate the mass parts of each component of the demulsifier of the intermediate layer aging oil mixture in the settling tank:

[0028] Fatty alcohol polyoxyethylene ether: 3 parts;

[0029] Methanol: 6 parts;

[0030] Functional main agent F: 75 parts;

[0031] Erucamidopropyl Hydroxysultaine: 2 parts;

[0032] The balance is water.

[0033] The preparation method of the demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank: add 140 parts by mass of deionized water to the reaction kettle, heat up to 35°C, and then add fatty alcohol poly 30 parts by mass of oxyethylene ether, 60 parts by mass of methanol, 750 parts by mass of functional main agent F, 20 parts by mass of erucamide propyl sulfobetaine, react at a constant temperature for 35 minutes and then cool to room temperature.

[0034] The demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank is used:

[0035...

Embodiment 2

[0041] Embodiment 2: the mass parts of each component of the demulsifier used to eliminate the middle layer aging oil mixture in the settling tank are:

[0042] Fatty alcohol polyoxyethylene ether: 3.5 parts;

[0043] Methanol: 6.5 parts;

[0044] Functional main agent F: 80 parts;

[0045] Erucamidopropyl Hydroxysultaine: 3 parts;

[0046] The balance is water.

[0047] The preparation method of the demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank: add 97 parts by mass of deionized water to the reaction kettle, heat up to 35°C, and then add fatty alcohol poly 35 parts by mass of oxyethylene ether, 65 parts by mass of methanol, 800 parts by mass of functional main agent F, 3 parts by mass of erucamide propyl hydroxysultaine, react at a constant temperature for 35 minutes and then cool to room temperature.

[0048] The demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank is used:

[0049] P...

Embodiment 3

[0055] Embodiment 3: be used to eliminate the mass parts of each component of the demulsifier of the middle layer aging oil mixture in the settling tank:

[0056] Fatty alcohol polyoxyethylene ether: 4 parts;

[0057] Methanol: 7 parts;

[0058] Functional main agent F: 77 parts;

[0059] Erucamidopropyl Hydroxysultaine: 2 parts;

[0060] The balance is water.

[0061] The preparation method of the demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank: add 100 parts by mass of deionized water to the reaction kettle, heat up to 35°C, and then add fatty alcohol poly 40 parts by mass of oxyethylene ether, 70 parts by mass of methanol, 770 parts by mass of functional main agent F, 20 parts by mass of erucamide propyl hydroxysultaine, react at a constant temperature for 35 minutes and then cool to room temperature.

[0062] The demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank is used:

[0063] P...

technical field

[0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a demulsifier for eliminating the aged oil mixture in the oil-water intermediate layer in a settling tank. Background technique

[0002] With the continuous deepening of oil field development, on the one hand, in the case of water displacement medium for oil displacement, part of the relatively heavy crude oil that cannot be driven by conventional water and adsorbed on the pore surface of underground reservoirs relies on technology. Innovative technical means have been produced; on the other hand, along with the further improvement of the technical level of reservoir understanding, some low-quality and difficult-to-recover reserves with relatively poor physical properties of crude oil have been discovered and put into production. The composition of the produced fluid of these oil wells is complex and the content of heavy components is high. Due to the increase o...

Examples

Embodiment 1

[0027] Embodiment 1: be used to eliminate the mass parts of each component of the demulsifier of the intermediate layer aging oil mixture in the settling tank:

[0028] Fatty alcohol polyoxyethylene ether: 3 parts;

[0029] Methanol: 6 parts;

[0030] Functional main agent F: 75 parts;

[0031] Erucamidopropyl Hydroxysultaine: 2 parts;

[0032] The balance is water.

[0033] The preparation method of the demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank: add 140 parts by mass of deionized water to the reaction kettle, heat up to 35°C, and then add fatty alcohol poly 30 parts by mass of oxyethylene ether, 60 parts by mass of methanol, 750 parts by mass of functional main agent F, 20 parts by mass of erucamide propyl sulfobetaine, react at a constant temperature for 35 minutes and then cool to room temperature.

[0034] The demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank is used:

[0035...

Embodiment 2

[0041] Embodiment 2: the mass parts of each component of the demulsifier used to eliminate the middle layer aging oil mixture in the settling tank are:

[0042] Fatty alcohol polyoxyethylene ether: 3.5 parts;

[0043] Methanol: 6.5 parts;

[0044] Functional main agent F: 80 parts;

[0045] Erucamidopropyl Hydroxysultaine: 3 parts;

[0046] The balance is water.

[0047] The preparation method of the demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank: add 97 parts by mass of deionized water to the reaction kettle, heat up to 35°C, and then add fatty alcohol poly 35 parts by mass of oxyethylene ether, 65 parts by mass of methanol, 800 parts by mass of functional main agent F, 3 parts by mass of erucamide propyl hydroxysultaine, react at a constant temperature for 35 minutes and then cool to room temperature.

[0048] The demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank is used:

[0049] P...

Embodiment 3

[0055] Embodiment 3: be used to eliminate the mass parts of each component of the demulsifier of the middle layer aging oil mixture in the settling tank:

[0056] Fatty alcohol polyoxyethylene ether: 4 parts;

[0057] Methanol: 7 parts;

[0058] Functional main agent F: 77 parts;

[0059] Erucamidopropyl Hydroxysultaine: 2 parts;

[0060] The balance is water.

[0061] The preparation method of the demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank: add 100 parts by mass of deionized water to the reaction kettle, heat up to 35°C, and then add fatty alcohol poly 40 parts by mass of oxyethylene ether, 70 parts by mass of methanol, 770 parts by mass of functional main agent F, 20 parts by mass of erucamide propyl hydroxysultaine, react at a constant temperature for 35 minutes and then cool to room temperature.

[0062] The demulsifier used to eliminate the aging oil mixture in the middle layer of the settling tank is used:

[0063] P...