CN113322096A - Demulsifier for low-temperature dehydration of complex mixed liquid produced by oil well - Google Patents
Demulsifier for low-temperature dehydration of complex mixed liquid produced by oil well Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 61
- 239000003129 oil well Substances 0.000 title claims abstract description 56
- 230000018044 dehydration Effects 0.000 title claims abstract description 38
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 7
- 229920000570 polyether Polymers 0.000 claims description 7
- ZQTYRTSKQFQYPQ-UHFFFAOYSA-N trisiloxane Chemical class [SiH3]O[SiH2]O[SiH3] ZQTYRTSKQFQYPQ-UHFFFAOYSA-N 0.000 claims description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 6
- 229960000583 acetic acid Drugs 0.000 claims description 6
- 239000012362 glacial acetic acid Substances 0.000 claims description 6
- 239000013538 functional additive Substances 0.000 claims description 4
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000084 colloidal system Substances 0.000 abstract description 7
- 238000007710 freezing Methods 0.000 abstract description 7
- 230000008014 freezing Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 36
- 208000005156 Dehydration Diseases 0.000 description 29
- 239000010779 crude oil Substances 0.000 description 11
- 239000001993 wax Substances 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/04—Dewatering or demulsification of hydrocarbon oils with chemical means
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1033—Oil well production fluids
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well, which comprises the following components in parts by mass: demulsifier TA-1031: 12-15 parts of Shandong Binshi group Limited company; and (3) a demulsifier HD-6: 4-5 parts of Shandong Binshi group Limited company; functional auxiliary agent TC-2: 35-40 parts of a solvent; methanol: 18-20 parts. The invention is applied to the low-temperature treatment of complex mixed liquid produced by different oil reservoir oil wells, and has better demulsification and dehydration effects on the low-temperature treatment of the complex mixed liquid produced by different oil reservoir oil wells. For a density of 0.892g/cm3The viscosity is 109mPa.S at 50 ℃, and the content of colloid asphaltene is 34.2%. The complex mixed liquid is extracted from an oil well with the wax content of 12.3 percent, the freezing point of 35 ℃ and the water content of 48.5 percent, 100mg/l of a demulsifier for low-temperature dehydration of the complex mixed liquid extracted from the oil well is added under the condition of 42 ℃ according to the oil and gas industry standard SY/T5281-plus 2000 of the people's republic of China, and the average dehydration rate is 99.59 percent and the oil content in dehydrated water is 0.41 percent through test detection.
Description
Technical Field
The invention relates to the technical field of oil extraction in oil fields, in particular to a demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well.
Background
Along with the increase of the difficulty of oil development and the deepening of the exploitation degree, on one hand, along with the implementation of measures for improving the recovery ratio such as forced extraction and forced injection, acidification, large-scale profile control and flooding, and the like, some crude oil with relatively heavy components adsorbed on the surface of pores of a reservoir is exploited, so that the properties of the produced liquid in the development process are greatly changed compared with those of primary oil extraction and secondary oil extraction stages, and the properties of the produced liquid tend to be more complex; on the other hand, along with the rolling development of the oil reservoir, the hard-to-recover reserves with relatively poor crude oil physical properties are continuously discovered and exploited, and the complex mixed liquid extracted from the oil well is seriously emulsified due to the increase of the density and the viscosity of the crude oil or the high content of heavy paraffin components, so that the natural settling separation speed of the oil-water mixed liquid is reduced. The difficulty of the produced mixed liquid of the oil wells with complex oil reservoirs is increased along with the treatment of the conventional produced liquid, so that the demulsification and dehydration effects are poor when the conventional demulsifier is used for treatment, the water content of the separated crude oil is higher, the oil content of the sewage exceeds the standard, the oil does not meet the specified requirements, and even the normal production is affected seriously due to the difficulty in treatment. Meanwhile, with the simplified and optimized processing flow of the produced liquid, one combined processing station needs to process mixed liquid produced by oil wells of different oil reservoirs in different blocks, long-term water injection exploitation of the oil reservoirs and mixing of a plurality of produced liquids of the oil reservoirs after being collected and conveyed to the combined processing station cause the temperature of the produced liquids to be lowered year by year, and the temperature rise and heating of a processing system not only consumes a large amount of energy, but also has the defects of environmental pollution and environmental protection.
The key technology is to find a proper low-temperature demulsifier on the premise of not changing the existing production treatment process. In order to solve the problem of low-temperature dehydration treatment of complex mixed liquid produced by an oil well, exploratory research is carried out successively in related petroleum colleges and oil fields, and the research results are mostly based on the properties of crude oil of each oil reservoir, the problem of demulsifying agent dosage increase or different types of demulsifying agent compounding is adopted for a treatment station with smaller daily treatment capacity, or the problem of demulsifying and dehydrating of the complex mixed liquid produced by the oil well is solved by heating the temperature of the mixed liquid by heating, and a low-temperature demulsifying agent with wide application range and strong adaptability for the treatment station with larger daily treatment capacity is not formed.
Disclosure of Invention
The demulsifier has strong broad spectrum, can effectively reduce the using amount of the demulsifier for dehydrating the complex mixed liquid extracted from the oil well, can obviously reduce the using temperature of the demulsifier, improve the dehydration efficiency of the complex mixed liquid extracted from the oil well, and is suitable for being applied to combined treatment stations with large daily treatment amount.
In order to achieve the aim, the invention provides a demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well, which is characterized by comprising the following components in parts by weight:
demulsifier TA-1031: 12-15 parts of Shandong Binshi group Limited company;
and (3) a demulsifier HD-6: 4-5 parts of Shandong Binshi group Limited company;
functional auxiliary agent TC-2: 35-40 parts of a solvent;
methanol: 18-20 parts of a solvent;
the balance being water.
The preparation method of the functional assistant TC-2 comprises the following steps:
654-746 Kg of deionized water and 280-320 Kg of isopropanol are added into a reaction kettle, then 53-57 Kg of 10% glacial acetic acid and 450-470 Kg of erucamidopropylhydroxysulfobetaine are added under the stirring condition of 1000 revolutions per minute, after the temperature is raised to 55 ℃, 73-77 Kg of triethanolamine and 350-370 Kg of polyether modified trisiloxane are sequentially added, the reaction is carried out for 60min under the constant temperature of 55 ℃, 48-52 Kg of 4% sodium hydroxide solution is added after the heating is stopped, the mixture is continuously stirred for 30min and then naturally cooled to the room temperature for standby.
The preparation method of the demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well comprises the following steps:
adding 400-620 parts by mass of deionized water into a reaction kettle, heating to 45 ℃, then sequentially adding 240-300 parts by mass of a demulsifier TA-1031, 80-100 parts by mass of a demulsifier HD-6, 700-800 parts by mass of a functional additive TC-2 and 360-400 parts by mass of methanol under the condition of stirring at 1000 revolutions per minute, reacting at constant temperature for 30min, and cooling to room temperature.
The using steps comprise:
the on-site pipeline dosing mode is adopted, and the required equipment comprises a dosing tank, a metering pump, a pipeline, a valve and other related auxiliary equipment.
1) Selecting a proper dosing point on the station-entering conveying pipeline and installing dosing equipment;
2) the demulsifier for dehydrating the complex mixed liquid produced by the oil well at low temperature is prepared, the using concentration of the demulsifier is 80-120 mg/L, and the using temperature is 40-65 ℃.
Firstly, preparing a functional additive TC-2, and then preparing a demulsifier for dehydrating complex mixed liquid produced by an oil well at a low temperature.
For example: for crude oil physical information: the density is 0.892g/cm3, the viscosity is 109mPa.S at 50 ℃, and the content of colloid asphaltene is 35.6%. The wax content is 18.3 percent, the freezing point is 35 ℃, the specific situation that the water content of the extracted complex mixed solution is 49.4 percent, the preparation method of the functional auxiliary agent TC-2 and the addition amount of each component are as follows: adding 654Kg of deionized water and 320Kg of isopropanol into a reaction kettle, then adding 57Kg of 10 percent glacial acetic acid and 470Kg of erucamidopropylhydroxysulfobetaine under the stirring condition of 1000 revolutions per minute, heating to 55 ℃, then sequentially adding 77Kg of triethanolamine and 370Kg of polyether modified trisiloxane, reacting at the constant temperature of 55 ℃ for 60min, stopping heating, adding 52Kg of 4 percent sodium hydroxide solution, continuing to stir for 30min, and naturally cooling to room temperature for later use; the addition and preparation method of each component in the demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well comprises the following steps: adding 520 parts by mass of deionized water into a reaction kettle, heating to 45 ℃, sequentially adding TA-1031270 parts by mass, HD-690 parts by mass, a functional assistant TC-2740 parts by mass and methanol under the stirring condition of 1000 revolutions per minute, reacting at constant temperature for 30 minutes, and cooling to room temperature.
3) And determining the dosing amount according to the daily treatment amount of the produced liquid collected by the corresponding transmission pipeline of each oil well, and adjusting the discharge amount of the metering pump to dose.
The amount of demulsifier used in the field is generally determined mainly by the indoor evaluation test results and daily treatment fluid amount. For example, the total amount of the complex mixed liquid produced after the oil well gathering pipelines are collected is 1000m3/d, and when the concentration is 100mg/l according to the evaluation test result, the addition amount of the demulsifier for dehydrating the complex mixed liquid produced by the oil well at low temperature is 100 kg/d.
The invention has the beneficial effects that: the method starts from the research on the structural characteristics of the oil-water interfacial tension and the interfacial activity of the complex mixed liquid extracted from the oil well, and determines that the main factor influencing the oil-water sedimentation separation is the difference between the oil-water interfacial tension and the interfacial activity by summarizing and analyzing the influence factors of a plurality of factors in the complex mixed liquid extracted from the oil well on the demulsification and dehydration effects. Therefore, the erucamide propyl hydroxysulfobetaine in the functional assistant TC-2 capable of obviously reducing the oil-water interfacial tension is introduced into a low-temperature demulsifier system, the polyether modified trisiloxane capable of improving the interfacial activity is obtained, and the demulsifier and the dosage for dehydrating complex mixed liquid produced by an oil well at a low temperature are obtained through screening determination, dosage change and compatibility test of each raw material composition, so that the high-quality oil standard that the water content of crude oil after demulsification and dehydration is not more than 0.5 percent is realized, and the oil content in sewage simultaneously meets the discharge requirement.
The results of laboratory tests show that the different dosage of one of the medicinesThe complex mixed liquid low-temperature dehydration demulsifier produced from the oil well has better demulsification and dehydration effects on complex mixed liquid produced from oil wells with different oil reservoirs. For a density of 0.892g/cm3The viscosity is 109mPa.S at 50 ℃, and the content of colloid asphaltene is 34.2%. The complex mixed liquid is extracted from an oil well with the wax content of 12.3 percent, the freezing point of 35 ℃ and the water content of 49.4 percent, 100mg/l of a demulsifier for low-temperature dehydration of the complex mixed liquid extracted from the oil well is added under the condition of 42 ℃ according to the oil and gas industry standard SY/T5281-plus 2000 of the people's republic of China, and the average dehydration rate is 99.54 percent and the oil content in dehydrated water is 0.46 percent through test detection.
Detailed Description
In the embodiment, all the adopted chemical raw materials are industrial-grade products, and the adding proportion is mass parts.
Example 1: the demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well comprises the following components in parts by mass:
demulsifier TA-1031: 12 parts of Shandong Binshi group Limited company;
and (3) a demulsifier HD-6: 4 parts of Shandong Binshi group Limited company;
functional auxiliary agent TC-2: 35 parts of (B);
methanol: 18 parts of a mixture;
the balance being water.
The preparation method of the functional assistant TC-2 comprises the following steps:
746Kg of deionized water and 280Kg of isopropanol are added into a reaction kettle, then 53Kg of 10 percent glacial acetic acid and 450Kg of erucamidopropylhydroxysulfobetaine are added under the stirring condition of 1000 r/min, after the temperature is raised to 55 ℃, 73Kg of triethanolamine and 350Kg of polyether modified trisiloxane are sequentially added, the reaction is carried out for 60min under the constant temperature condition of 55 ℃, 48Kg of 4 percent sodium hydroxide solution is added after the heating is stopped, the stirring is continued for 30min, and the mixture is naturally cooled to the room temperature for standby.
A preparation method of a demulsifier for dehydrating complex mixed liquid produced by an oil well at a low temperature comprises the following steps: adding 620 parts by mass of deionized water into a reaction kettle, heating to 45 ℃, and then sequentially adding TA-1031240 parts by mass and HD-680 parts by mass under the stirring condition of 1000 revolutions per minuteThe preparation method comprises the following steps of reacting for 30min at constant temperature, wherein the components are TC-2700 parts by mass of functional auxiliary agent and 360 parts by mass of methanol, and cooling to room temperature. The physical properties of the crude oil of the complex mixed liquid extracted from a certain oil reservoir oil well are as follows: density 0.887g/cm3The viscosity of the crude oil at 50 ℃ is 43.7mPa.S, and the content of colloid asphaltene is 32.9%. The complex mixed liquid is extracted from an oil well with the wax content of 10.3 percent, the freezing point of 34 ℃ and the water content of 48.5 percent, 100mg/l of a demulsifier for low-temperature dehydration of the complex mixed liquid extracted from the oil well is added under the condition of 42 ℃ according to the oil and gas industry standard SY/T5281-plus 2000 of the people's republic of China, and the average dehydration rate is 99.59 percent and the oil content in dehydrated water is 0.41 percent through test detection.
The using concentration of the demulsifier is 80-120 mg/L, and the using temperature is 40-65 ℃.
Example 2: the demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well comprises the following components in parts by mass:
demulsifier TA-1031: 15 parts of Shandong Binshi group Limited company;
and (3) a demulsifier HD-6: 5 parts of Shandong Binshi group Limited company;
functional auxiliary agent TC-2: 40 parts of a mixture;
methanol: 20 parts of (1);
the balance being water.
The preparation method of the functional assistant TC-2 comprises the following steps:
adding 700Kg of deionized water and 300Kg of isopropanol into a reaction kettle, then adding 55Kg of 10% glacial acetic acid and 460Kg of erucamidopropylhydroxysulfobetaine under the stirring condition of 1000 revolutions per minute, heating to 55 ℃, then sequentially adding 75Kg of triethanolamine and 360Kg of polyether modified trisiloxane, reacting for 60min at a constant temperature of 55 ℃, adding 50Kg of 4% sodium hydroxide solution after stopping heating, continuing to stir for 30min, and naturally cooling to room temperature for later use.
A preparation method of a demulsifier for dehydrating complex mixed liquid produced by an oil well at a low temperature comprises the following steps: adding 400 parts by mass of deionized water into a reaction kettle, heating to 45 ℃, and then sequentially adding TA-1031300 parts by mass, HD-6100 parts by mass, TC-2800 parts by mass of functional assistant, 400 parts by mass of methanol, and the like under the stirring condition of 1000 revolutions per minute,Reacting at constant temperature for 30min, and cooling to room temperature. The physical properties of the crude oil of the complex mixed liquid extracted from a certain oil reservoir oil well are as follows: density 0.891g/cm3The viscosity is 96mPa.S at 50 ℃, and the content of colloid asphaltene is 36.2%. The complex mixed liquid is extracted from an oil well with the wax content of 12.3 percent, the freezing point of 34 ℃ and the water content of 49.4 percent, 100mg/l of a demulsifier for low-temperature dehydration of the complex mixed liquid extracted from the oil well is added under the condition of 42 ℃ according to the standard SY/T5281-plus 2000 of the oil and gas industry of the people's republic of China, and the average dehydration rate is 99.54 percent and the oil content in dehydrated water is 0.46 percent through test detection.
The using concentration of the demulsifier is 80-120 mg/L, and the using temperature is 40-65 ℃.
Example 3: the demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well comprises the following components in parts by mass:
demulsifier TA-1031: 13.5 parts of Shandong Binshi group Limited;
and (3) a demulsifier HD-6: 4.5 parts of Shandong Binshi group Limited company;
functional auxiliary agent TC-2: 37 parts of;
methanol: 19 parts of a mixture;
the balance being water.
The preparation method of the functional assistant TC-2 comprises the following steps:
654Kg of deionized water and 320Kg of isopropanol are added into a reaction kettle, then 57Kg of 10 percent glacial acetic acid and 470Kg of erucamidopropylhydroxysulfobetaine are added under the stirring condition of 1000 revolutions per minute, after the temperature is raised to 55 ℃, 77Kg of triethanolamine and 370Kg of polyether modified trisiloxane are sequentially added, the reaction is carried out for 60min under the constant temperature condition of 55 ℃, 52Kg of 4 percent sodium hydroxide solution is added after the heating is stopped, the stirring is continued for 30min, and then the mixture is naturally cooled to the room temperature for standby.
A preparation method of a demulsifier for dehydrating complex mixed liquid produced by an oil well at a low temperature comprises the following steps: adding 520 parts by mass of deionized water into a reaction kettle, heating to 45 ℃, sequentially adding TA-1031270 parts by mass, HD-690 parts by mass, a functional assistant TC-2740 parts by mass and methanol under the stirring condition of 1000 revolutions per minute, reacting at constant temperature for 30 minutes, and cooling to room temperature.
The physical properties of the crude oil of the complex mixed liquid extracted from a certain oil reservoir oil well are as follows: density 0.892g/cm3The viscosity is 109mPa.S at 50 ℃, and the content of colloid asphaltene is 35.6%. The complex mixed liquid is extracted from an oil well with the wax content of 18.3 percent, the freezing point of 35 ℃ and the water content of 49.4 percent, 100mg/l of a demulsifier for low-temperature dehydration of the complex mixed liquid extracted from the oil well is added under the condition of 42 ℃ according to the oil and gas industry standard SY/T5281-plus 2000 of the people's republic of China, and the average dehydration rate is 99.56 percent and the oil content in dehydrated water is 0.44 percent through test detection.
The using concentration of the demulsifier is 80-120 mg/L, and the using temperature is 40-65 ℃.
Aiming at the treatment of complex mixed liquid produced by different blocks and different oil reservoirs and oil wells, when the demulsifier treating agent for low-temperature dehydration of complex mixed liquid produced by the oil wells is selected, targeted experiments are required to be carried out and the optimal effect is adjusted. It is recommended to use the formulation as in example (1) or to carry out a targeted adjustment on the basis of example (3).
The invention is applied to the low-temperature treatment of complex mixed liquid produced by different oil reservoir oil wells, and has better demulsification and dehydration effects on the low-temperature treatment of the complex mixed liquid produced by different oil reservoir oil wells. For a density of 0.892g/cm3The viscosity is 109mPa.S at 50 ℃, and the content of colloid asphaltene is 35.6%. The complex mixed liquid is extracted from an oil well with the wax content of 18.3 percent, the freezing point of 35 ℃ and the water content of 49.4 percent, a demulsifier with better treatment effect commonly used in the oil extraction field is adopted according to the oil and gas industry standard SY/T5281-2000 of the people's republic of China at 42 ℃, when the addition amount is 100mg/l, the test detects that the average dehydration rate is 16.2 percent, the oil content in dehydrated water is 4.5 percent, when the addition amount is 200mg/l, the test detects that the average dehydration rate is 33.4 percent and the oil content in the dehydrated water is 2.7 percent, and the normal production requirement cannot be met; when 100mg/l of demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well is added, the average dehydration rate is 99.59 percent and the oil content in dehydrated water is 0.41 percent according to test detection. Contrast tests show that the demulsifier for dehydrating the complex mixed liquid produced by the oil well at low temperature not only can realize low-temperature demulsification and dehydrationThe production requirement is met, the effect is obvious, and the technical index required by the industry standard can be met.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (4)
1. The demulsifier for low-temperature dehydration of complex mixed liquid produced by an oil well is characterized by comprising the following components in parts by weight:
demulsifier TA-1031: 12-15 parts of Shandong Binshi group Limited company;
and (3) a demulsifier HD-6: 4-5 parts of Shandong Binshi group Limited company;
functional auxiliary agent TC-2: 35-40 parts of a solvent;
methanol: 18-20 parts of a solvent;
the balance being water.
2. The demulsifier for low-temperature dehydration of complex mixed liquor produced by an oil well, according to claim 1, wherein the preparation method of the functional additive TC-2 comprises:
654-746 Kg of deionized water and 0280-320 Kg of isopropanol are added into a reaction kettle, then 53-57 Kg of 10 percent glacial acetic acid and 450-470 Kg of erucamide propyl hydroxysulfobetaine are added under the stirring condition of 1000 revolutions per minute, after the temperature is raised to 55 ℃, 73-77 Kg of triethanolamine and 350-370 Kg of polyether modified trisiloxane are sequentially added, the constant temperature reaction is carried out for 60min under the condition of 55 ℃, 48-52 Kg of 4 percent sodium hydroxide solution is added after the heating is stopped, the mixture is continuously stirred for 30min and then is naturally cooled to the room temperature for standby.
3. The demulsifier for low-temperature dehydration of complex mixed liquor produced by an oil well according to claim 1, wherein the preparation method comprises the following steps:
adding 400-620 parts by mass of deionized water into a reaction kettle, heating to 45 ℃, then sequentially adding 240-300 parts by mass of a demulsifier TA-1031, 80-100 parts by mass of a demulsifier HD-6, 700-800 parts by mass of a functional additive TC-2 and 360-400 parts by mass of methanol under the condition of stirring at 1000 revolutions per minute, reacting at constant temperature for 30min, and cooling to room temperature.
4. The demulsifier for low-temperature dehydration of complex mixed liquor produced by an oil well according to claim 1, wherein the demulsifier has a use concentration of 80-120 mg/L and a use temperature of 40-65 ℃.
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| CN202110497393.1A CN113322096A (en) | 2021-05-07 | 2021-05-07 | Demulsifier for low-temperature dehydration of complex mixed liquid produced by oil well |
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| CN202110497393.1A CN113322096A (en) | 2021-05-07 | 2021-05-07 | Demulsifier for low-temperature dehydration of complex mixed liquid produced by oil well |
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| US20110011806A1 (en) * | 2008-03-04 | 2011-01-20 | Sophia Ebert | Use of alkoxylated polyalkanolamines for splitting oil-water emulsions |
| CN107267197A (en) * | 2017-08-24 | 2017-10-20 | 马鞍山中粮生物化学有限公司 | A kind of oil high-efficient demulsifier and preparation method thereof |
| CN110093178A (en) * | 2019-04-25 | 2019-08-06 | 河北华北石油天成实业集团有限公司 | A kind of demulsifier, preparation method and application method for the dehydration of Complex Reservoir produced liquid in oil well mixture |
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- 2021-05-07 CN CN202110497393.1A patent/CN113322096A/en active Pending
Patent Citations (3)
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| US20110011806A1 (en) * | 2008-03-04 | 2011-01-20 | Sophia Ebert | Use of alkoxylated polyalkanolamines for splitting oil-water emulsions |
| CN107267197A (en) * | 2017-08-24 | 2017-10-20 | 马鞍山中粮生物化学有限公司 | A kind of oil high-efficient demulsifier and preparation method thereof |
| CN110093178A (en) * | 2019-04-25 | 2019-08-06 | 河北华北石油天成实业集团有限公司 | A kind of demulsifier, preparation method and application method for the dehydration of Complex Reservoir produced liquid in oil well mixture |
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