CN115746901A - Compound demulsifier and application thereof, and method for treating polymer-containing produced liquid in oil field through physicochemical coupling - Google Patents
Compound demulsifier and application thereof, and method for treating polymer-containing produced liquid in oil field through physicochemical coupling Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 120
- 238000004581 coalescence Methods 0.000 claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 40
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 12
- 229920000570 polyether Polymers 0.000 claims abstract description 12
- 239000000080 wetting agent Substances 0.000 claims abstract description 12
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- 239000003921 oil Substances 0.000 claims description 73
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 21
- 239000010779 crude oil Substances 0.000 claims description 18
- 230000005684 electric field Effects 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 15
- 239000003960 organic solvent Substances 0.000 claims description 9
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 7
- HEBRGEBJCIKEKX-UHFFFAOYSA-M sodium;2-hexadecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O HEBRGEBJCIKEKX-UHFFFAOYSA-M 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
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Abstract
The invention provides a compound demulsifier, application thereof and a method for treating polymer-containing produced liquid in an oil field by physicochemical coupling, belonging to the technical field of treatment of produced liquid in the oil field. The compound demulsifier adopts a nonionic demulsifier, and has a structure obtained by modifying branched chain silane with polyether starting from polyamine, so that the compound demulsifier can be better spread on an oil-water interface and is convenient for demulsification; according to the invention, the viscosity reducer and the wetting agent are added at the same time, so that the viscosity can be reduced, the viscosity can act on an oil-water interface, demulsification separation is realized, and an interface film is opened, so that oil-water separation is realized. The compound demulsifier disclosed by the invention can be directly added to polymer-containing produced liquid without heating, and is effectively coupled to a high-frequency coalescence device under a low-temperature condition, so that the demulsifier and a separator act together, the oil-water separation performance is improved, the high-efficiency separation of the polymer-containing produced liquid under the low-temperature condition is realized, and the energy consumption and the cost are greatly reduced.
Description
Technical Field
The invention relates to the technical field of oilfield produced liquid treatment, in particular to a compound demulsifier, application thereof and a method for treating polymer-containing oilfield produced liquid through physicochemical coupling.
Background
The polymer flooding technology is the most mature economic technology in the tertiary oil recovery technology at present and is popularized and applied in large scale in victory oil fields, daqing oil fields and the like. However, the polymer flooding technology can cause the property of produced liquid to change, namely, the produced liquid has high emulsification stability, small oil drop particle size, high viscosity and more stable oil-water interface, so that the problems of difficult oil-water separation, high content of suspended matters and the like are caused. At present, a three-phase separator is generally adopted in a combined station for pre-dehydration so as to reduce the water content of crude oil and the oil content of sewage, and greatly reduce the energy consumption of a subsequent heating furnace and the pressure of a sewage station. However, the separation effect of the conventional three-phase separator on the polymer-containing produced liquid is not ideal due to the strong interface stability of the polymer-containing produced liquid, and the water content in oil is still higher than 85% at the outlet of the conventional three-phase separator, so that the subsequent treatment pressure is extremely high. The high-frequency coalescence water separator can effectively separate water in oil, and after separation, the water content of outlet oil can be reduced to below 65%, so that the burden of a subsequent process is greatly reduced. However, the high-frequency coalescence water separator is characterized in that the free water in the incoming liquid can be effectively separated, but the polymer-containing produced liquid system is complex and has multiple emulsibility, the emulsion type is changed from water-in-oil type at the initial development stage of an oil field to oil-in-water type and water-in-oil-in-water type multiple emulsification states, namely, water and oil in the polymer-containing produced liquid are mutually emulsified, the water exists in the system in an emulsification state, and the water-oil separation is difficult to realize by adopting physical devices such as a three-phase separator, a high-frequency coalescence separation device and the like.
At present, the traditional treatment process of polymer-containing produced liquid comprises the following steps: and separating the polymer-containing produced liquid in a three-phase separator, and then heating the separated polymer-containing produced liquid to reach a demulsification condition, and adding a demulsifier to perform demulsification. The method has the problems that the water content of oil at the outlet of the three-phase separator is higher than 70%, the energy consumption for heating the subsequent sewage is very large, the amount of added demulsifying agent is large due to huge incoming liquid, and the waste of the agent is serious. In addition, in the traditional treatment process, a cation pre-dehydrating agent is added at the front end of a three-phase separator (the first treatment process of a combined station), and for a polymer-containing system, polymer-containing oil sludge is generated and attached to parts of the separator, so that the original functions are difficult to exert, and the separation efficiency is reduced.
Disclosure of Invention
The invention aims to provide a compound demulsifier, application thereof, and a method for treating polymer-containing produced fluid in an oil field by physicochemical coupling, which can realize high-efficiency oil-water separation of the polymer-containing produced fluid.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a compound demulsifier, which comprises the following components in percentage by mass:
20-30% of first demulsifier, 10-20% of second demulsifier, 15-25% of organic solvent, 5% of viscosity reducer, 2-5% of wetting agent and the balance of water; the first demulsifier is polyamine polyether demulsifier; the second demulsifier is phenolic resin polyether demulsifier.
Preferably, the first demulsifier is JH-203; the model of the second demulsifier is SLHG-03; the organic solvent comprises methanol.
Preferably, the viscosity reducer comprises sodium hexadecylbenzene sulfonate.
Preferably, the wetting agent comprises Span-80.
The invention provides application of the compound demulsifier in treating polymer-containing produced fluid in an oil field.
The invention provides a method for treating polymer-containing produced liquid in an oil field by physicochemical coupling, which comprises the following steps:
mixing the polymer-containing produced liquid with a demulsifier to obtain polymer-containing produced liquid containing the demulsifier; the demulsifier is the compound demulsifier in the technical scheme;
and (3) placing the polymer-containing produced liquid containing the demulsifier in a high-frequency coalescence device, and performing oil-water separation to obtain a water phase and a crude oil produced liquid.
Preferably, the concentration of the demulsifier in the polymer-containing produced fluid is 50-100 ppm.
Preferably, the frequency of the electric field of the high-frequency coalescence device is 10000-15000 Hz, and the time for oil-water separation is 50-200 min.
Preferably, the water content of the crude oil produced liquid is less than or equal to 40%.
Preferably, the oil content of the water phase is less than or equal to 100mg/L.
The invention provides a compound demulsifier, which comprises the following components in percentage by mass: 20-30% of first demulsifier, 10-20% of second demulsifier, 15-25% of organic solvent, 5% of viscosity reducer, 2-5% of wetting agent and the balance of water; the first demulsifier is polyamine polyether demulsifier; the second demulsifier is phenolic resin polyether demulsifier. The compound demulsifier adopts a nonionic demulsifier, has a structure obtained by modifying branched chain silane with polyether starting from polyamine, can be better spread on an oil-water interface, is convenient for demulsification, can respectively exert the effects of water purification (a first demulsifier) and dehydration (a second demulsifier), and is beneficial to exerting the demulsification effect after compounding; according to the invention, the viscosity reducer and the wetting agent are added simultaneously, so that the viscosity can be reduced, the dehydration is facilitated, the emulsification degree of solid impurities to the interface is weakened, the emulsion breaking separation is realized, the interface membrane is opened, and the oil-water separation is realized.
The compound demulsifier has good demulsification effect, does not need to be heated to improve the demulsification effect, can be directly added to polymer-containing produced liquid, can be effectively coupled to a high-frequency coalescence device under the low-temperature condition (the temperature of polymer-containing liquid at a well head is 35-45 ℃), enables the demulsifier to act together with a separator, enables the demulsifier to better separate multiple emulsified produced liquid under the action of an electric field of the high-frequency coalescence device, enables separated free water to be separated out more quickly under the action of coalescence materials in the high-frequency coalescence device, enables the separated crude oil to float in the device and further purify and separate, enables more produced water in the produced liquid to be separated out, improves oil-water separation performance, realizes efficient separation of the polymer-containing produced liquid under the low-temperature condition, greatly reduces the subsequent treatment pressure and energy consumption required by subsequent heating treatment, and reduces the cost. After separation, the water content in the oil is greatly reduced, the subsequent treatment pressure is greatly improved, the energy consumption is reduced, chemical demulsifiers added in the whole process are all nonionic, the possibility of reunion of sludge is avoided, the addition amount is low, and the process technology is mature.
Drawings
FIG. 1 is a flow diagram of a method for treating polymer-containing produced fluid in an oil field by physicochemical coupling.
Detailed Description
The invention provides a compound demulsifier, which comprises the following components in percentage by mass:
20-30% of first demulsifier, 10-20% of second demulsifier, 15-25% of organic solvent, 5% of viscosity reducer, 2-5% of wetting agent and the balance of water; the first demulsifier is a polyamine polyether demulsifier; the second demulsifier is a phenolic resin polyether demulsifier.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
The compound demulsifier provided by the invention comprises 20-30% of a first demulsifier, preferably 25% of the first demulsifier by mass percentage; the first demulsifier is polyamine polyether demulsifier; the first demulsifier is preferably JH-203 in model number. The first demulsifier of the present invention is preferably purchased from Jinhua auxiliary factory.
The compound demulsifier provided by the invention comprises 10-20% of a second demulsifier, preferably 15% of the second demulsifier by mass percentage; the second demulsifier is a phenolic resin polyether demulsifier; the second demulsifier is preferably SLHG-03. The second demulsifier of the present invention is preferably purchased from a victory chemical plant.
The compound demulsifier provided by the invention comprises 15-25% of organic solvent, preferably 20% of organic solvent. In the present invention, the organic solvent preferably includes methanol.
The compound demulsifier provided by the invention comprises 5% of viscosity reducer by mass percentage, and the viscosity reducer preferably comprises sodium hexadecylbenzene sulfonate.
The compound demulsifier provided by the invention comprises 2-5% of wetting agent, and more preferably 3% of wetting agent. In the present invention, the wetting agent preferably comprises Span-80.
The viscosity reducer and the wetting agent are added simultaneously, so that the viscosity of the produced liquid is reduced, dehydration is facilitated, and the emulsification degree of solid impurities to the interface is weakened. The compound demulsifier can act on an oil-water interface to demulsify and separate produced liquid, open an interface film and realize oil-water separation.
The compound demulsifier provided by the invention comprises the balance of water in percentage by mass.
The invention provides application of the compound demulsifier in treating polymer-containing produced fluid in an oil field.
The compound demulsifier is added to well drainage liquid (polymer-containing produced liquid), enters a high-frequency coalescence device along with the produced liquid after being impacted by a pipeline and realizes cyclone gas separation, the produced liquid containing the demulsifier enters a coalescence separation area from a rectification separation baffle, under the synergistic action of electric field coalescence, material coalescence (coalescence material plays a role) and the demulsifier in the coalescence device, free water is firstly separated from the produced liquid and enters a water phase, in the water phase, a hydrophilic group in the demulsifier can open an interface membrane of water and oil, so that oil drops are gathered and quickly float upwards, the water is further purified, and purified water at the bottom of the water phase flows into a water chamber through a regulating water tank; in the oil phase part, the high water-containing oil phase part containing emulsified water opens an interface film for multiple emulsification of oil water and water oil under the combined action of the hydrophilic base and the hydrophilic base of the demulsifier, so that the emulsified water is separated, polymerized and rapidly sinks, oil drops float and polymerize, further separation of the oil water is realized, free water separated out by demulsification can be more rapidly separated under the synergistic action of a coalescence material and an electric field, the water content of the oil phase part is greatly reduced, the low water-containing oil continuously floats upwards, and the oil flows into an oil chamber through an oil overflow plate, so that oil-water separation is realized.
The invention provides a method for treating polymer-containing produced liquid in an oil field by physicochemical coupling, which comprises the following steps:
mixing the polymer-containing produced liquid with a demulsifier to obtain polymer-containing produced liquid containing the demulsifier; the demulsifier is the compound demulsifier in the technical scheme;
and (3) placing the polymer-containing produced liquid containing the demulsifier in a high-frequency coalescence device, and performing oil-water separation to obtain a water phase and a crude oil produced liquid.
The source of the polymer-containing produced liquid is not particularly limited and can be obtained according to a method well known in the art; the water content of the polymer-containing produced liquid is preferably 95.8%.
In the invention, the concentration of the demulsifier in the polymer-containing produced fluid is preferably 50-100 ppm, and more preferably 75ppm.
The demulsifier and the polymer-containing produced fluid are mixed without special limitation, and the demulsifier and the polymer-containing produced fluid are uniformly mixed according to the well-known process in the field.
The present invention is not particularly limited to the high-frequency coalescing apparatus, and a high-frequency coalescing apparatus disclosed to be equipped with a coalescing material, which is well known in the art, may be used; the coalescing material is preferably a stainless steel coalescing plate. Under the action of hydrophobicity, the coalescence material can enable oil drops and water drops to be coalesced into large water drops and large oil drops more quickly, so that separation is facilitated.
In the invention, the frequency of the electric field of the high-frequency coalescence device is preferably 10000-15000 Hz, more preferably 12000Hz, and the time for oil-water separation is preferably 50-200 min, more preferably 75-150 min, namely the residence time of the polymer-containing produced fluid in the high-frequency coalescence device.
In the invention, the water content of the treated crude oil produced liquid can be reduced to below 40 percent; the oil content of the treated water phase can be reduced to below 200 mg/L.
FIG. 1 is a flow diagram of a method for treating polymer-containing produced fluid in an oil field by physicochemical coupling, as shown in FIG. 1, comprising the following stages: oil-water pre-separation of polymer-containing produced liquid; and a second stage: purifying a water phase; and a third stage: demulsifying and separating the high-water-content crude oil; and a fourth stage: purifying and separating crude oil with low water content.
Stage one: oil-water pre-separation of polymer-containing produced liquid: the polymer-containing produced liquid containing the demulsifier enters a coalescence-separation area from a rectification separation baffle plate, the polymer-containing produced liquid is quickly layered into a water phase and an oil phase under the synergistic action of the demulsifier, the water phase sinks into a water chamber, the oil phase floats upwards, the pre-separation of the oil and the water is realized, and the water phase and the high-water-content crude oil produced liquid are obtained;
and a second stage: water phase purification, demulsification and cleaning: under the action of the coalescence material, the lipophilic group in the demulsifier can better open an oil-water interfacial film, so that oil droplets are gathered and float upwards, and the water phase is further purified, so that the oil content of an outlet is lower than 100mg/L. At the stage, the demulsifier cooperates with the coalescence material to realize the purification of the sewage;
and a third stage: demulsifying and separating high-water-content crude oil and purifying and separating low-water-content crude oil: the method comprises the steps of opening an interface film of multiple emulsification of oil water and water oil of a high water-containing oil phase part (the water content of a high water-containing crude oil produced liquid is 60-70%) containing emulsified water under the combined action of a demulsifier hydrophilic base and a hydrophilic base, so that the emulsified water is separated and polymerized and rapidly sinks, oil drops float and polymerize, further separation of the oil water is realized, and free water obtained by demulsification can be separated more rapidly under the synergistic action of a coalescing material and an electric field (the electric field has the effect of rapidly coalescing oil drops and water drops in the produced liquid in which the demulsifier breaks emulsion so as to form large water drops and oil drops and macroscopically realize oil-water separation), so that the water content of the oil phase part is greatly reduced, the oil phase part continuously floats upwards to the oil chamber through an oil overflow plate, and the bottom of the water phase part flows into a water chamber through a water purification tank. At this stage, the emulsified water in oil is fully separated into water phase part, the water content in oil is lower than 40%, and the reaction time is properly prolonged and can be reduced to below 10%.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, demulsifier JH-203 was obtained from the Kinhua auxiliary plant and demulsifier SLHG-03 was obtained from the Shengli chemical plant.
Example 1
Adding a demulsifier into polymer-containing produced liquid (with the water content of 95.8%) to enable the concentration of the demulsifier to be 50ppm, wherein the demulsifier comprises (JH-203 (20%), SLHG-03 (10%)), methanol (15%), sodium hexadecylbenzene sulfonate (5%), span-80 (2%) and tap water to be 48%; and the polymer-containing produced liquid containing the demulsifier enters a high-frequency coalescence device under the action of a medicine adding pump, demulsification and separation are carried out under the combined action of a coalescence material and an electric field in the high-frequency coalescence device, the polymer-containing produced liquid stays in the high-frequency coalescence device for 50min, the frequency of the electric field is 10000Hz, and an oil phase and a water phase after separation are obtained.
By adopting a GB/T8926-2006 crude oil water content detection method, the water content of the oil phase after treatment at the outlet of the high-frequency coalescence device is detected to be 36.8%, and the oil content of the water phase is detected to be 198.3mg/L.
Example 2
Adding a demulsifier into polymer-containing produced liquid (with the water content of 95.8%) to enable the concentration of the demulsifier to be 75ppm, wherein the demulsifier comprises (JH-203 (30%), SLHG-03 (15%)), methanol (20%), sodium hexadecyl benzene sulfonate (5%), span-80 (3%) and tap water 27%; the polymer-containing produced liquid containing the demulsifier enters a high-frequency coalescence device under the action of a medicine feeding pump, and is demulsified and separated under the combined action of a coalescence material and an electric field in the high-frequency coalescence device; the polymer-containing produced liquid stays in the high-frequency coalescence device for 75min, the electric field frequency is 10000Hz, and separated oil phase and water phase are obtained.
By adopting a GB/T8926-2006 crude oil water content detection method, the water content of the oil phase after treatment at the outlet of the high-frequency coalescence device is detected to be 20.8%, and the oil content of the water phase is detected to be 123.8mg/L.
Example 3
Adding a demulsifier into polymer-containing produced liquid (with the water content of 95.8%) to ensure that the concentration of the demulsifier is 100ppm, wherein the demulsifier comprises (JH-203 (30%), SLHG-03 (15%)), methanol (20%), sodium hexadecylbenzene sulfonate (5%), span-80 (5%) and tap water (25%); the polymer-containing produced liquid containing the demulsifier enters a high-frequency coalescence device under the action of a medicine feeding pump, and is demulsified and separated under the combined action of a coalescence material and an electric field in the high-frequency coalescence device; the polymer-containing produced liquid stays in the high-frequency coalescence device for 150min, the frequency of an electric field is 12000Hz, and an oil phase and a water phase after separation are obtained.
By adopting a GB/T8926-2006 crude oil water content detection method, the water content of the oil phase after treatment at the outlet of the high-frequency coalescence device is detected to be 15.6%, and the oil content of the water phase is detected to be 98.6mg/L.
Example 4
Adding an emulsion breaker into a polymer-containing produced liquid (with the water content of 95.8%) to enable the concentration of the emulsion breaker to be 100ppm, wherein the emulsion breaker comprises JH-203 (20%), SLHG-03 (20%), methanol (20%), sodium hexadecylbenzene sulfonate (5%), span-80 (3%) and tap water (32%); the polymer-containing produced liquid containing the demulsifier enters a high-frequency coalescence device under the action of a medicine feeding pump, and is demulsified and separated under the combined action of a coalescence material and an electric field in the high-frequency coalescence device; the polymer-containing produced liquid stays in the high-frequency coalescence device for 200min, the frequency of an electric field is 15000Hz, and an oil phase and a water phase after separation are obtained.
By adopting a GB/T8926-2006 crude oil water content detection method, the water content of the oil phase after treatment at the outlet of the high-frequency coalescence device is detected to be 11.3%, and the oil content of the water phase is detected to be 52.3mg/L.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The compound demulsifier is characterized by comprising the following components in percentage by mass:
20-30% of first demulsifier, 10-20% of second demulsifier, 15-25% of organic solvent, 5% of viscosity reducer, 2-5% of wetting agent and the balance of water; the first demulsifier is a polyamine polyether demulsifier; the second demulsifier is a phenolic resin polyether demulsifier.
2. The compound demulsifier of claim 1, wherein the first demulsifier is of the type JH-203; the model of the second demulsifier is SLHG-03; the organic solvent comprises methanol.
3. The compounded demulsifier of claim 1, wherein the viscosity reducer comprises sodium hexadecylbenzene sulfonate.
4. The compounded demulsifier of claim 1, wherein the wetting agent comprises Span-80.
5. The application of the compound demulsifier of any one of claims 1 to 4 in the treatment of polymer-containing produced fluid in oil fields.
6. A method for treating polymer-containing produced liquid in an oil field by physicochemical coupling comprises the following steps:
mixing the polymer-containing produced liquid with a demulsifier to obtain polymer-containing produced liquid containing the demulsifier; the demulsifier is the compound demulsifier of any one of claims 1 to 4;
and (3) placing the polymer-containing produced liquid containing the demulsifier in a high-frequency coalescence device, and performing oil-water separation to obtain a water phase and a crude oil produced liquid.
7. The method of claim 6, wherein the concentration of the demulsifier in the polymer-containing production fluid is from 50 to 100ppm.
8. The method according to claim 6, wherein the frequency of the electric field of the high-frequency coalescence apparatus is 10000 to 15000Hz, and the time for oil-water separation is 50 to 200min.
9. The method of claim 6, wherein the crude oil production fluid has a water content of 40% or less.
10. The method of claim 6, wherein the aqueous phase has an oil content of 100mg/L or less.
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102492460A (en) * | 2011-12-21 | 2012-06-13 | 孙安顺 | Preparation method and application of crude oil low-temperature demulsifier |
| CN103992784A (en) * | 2013-11-20 | 2014-08-20 | 克拉玛依市新融科技有限公司 | Thickened oil emulsification viscosity reduction-demulsification compound and preparation method thereof |
| CN110872526A (en) * | 2018-09-01 | 2020-03-10 | 长江三星能源科技股份有限公司 | Low-temperature crude oil demulsifier |
| CN114736707A (en) * | 2021-01-07 | 2022-07-12 | 中国石油天然气集团有限公司 | Composite polyether type demulsifier and preparation method thereof |
| CN114540076A (en) * | 2022-03-21 | 2022-05-27 | 中石化石油工程技术服务有限公司 | Crude oil extraction liquid double-field processing device |
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