CN116333779A - Thickened oil dehydration method and dehydration system - Google Patents
Thickened oil dehydration method and dehydration system Download PDFInfo
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- CN116333779A CN116333779A CN202111582329.XA CN202111582329A CN116333779A CN 116333779 A CN116333779 A CN 116333779A CN 202111582329 A CN202111582329 A CN 202111582329A CN 116333779 A CN116333779 A CN 116333779A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000018044 dehydration Effects 0.000 title abstract description 53
- 238000006297 dehydration reaction Methods 0.000 title abstract description 53
- 239000003921 oil Substances 0.000 claims abstract description 265
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 159
- 238000010438 heat treatment Methods 0.000 claims abstract description 77
- 239000010779 crude oil Substances 0.000 claims abstract description 50
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 238000001704 evaporation Methods 0.000 claims abstract description 17
- 230000008020 evaporation Effects 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 13
- 239000002904 solvent Substances 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 8
- 239000000839 emulsion Substances 0.000 claims description 6
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims 5
- 238000007701 flash-distillation Methods 0.000 claims 3
- 239000000654 additive Substances 0.000 abstract description 8
- 239000012535 impurity Substances 0.000 abstract description 6
- 239000000047 product Substances 0.000 description 14
- 230000000704 physical effect Effects 0.000 description 11
- 238000004062 sedimentation Methods 0.000 description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000003995 emulsifying agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- 238000009835 boiling Methods 0.000 description 2
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- 230000005684 electric field Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 230000005653 Brownian motion process Effects 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 229910052801 chlorine Inorganic materials 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
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- 239000003814 drug Substances 0.000 description 1
- 238000009296 electrodeionization Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002569 water oil cream Substances 0.000 description 1
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- 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
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- 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 thickened oil dehydration method and a dehydration system, wherein the thickened oil dehydration method comprises the following steps: (1) Adding water into the extracted thick oil, and uniformly mixing the crude oil and the water, so that chemical components which are soluble in water in the extracted thick oil are dissolved in the water; (2) Performing primary water-oil separation on the mixture obtained in the step (1); (3) Adding a light oil product and a demulsifier into the oil liquid obtained by the separation in the step (2), and heating; (4) Settling the heated oil liquid to separate the oil from water to obtain crude oil; (5) And (3) carrying out flash evaporation on the crude oil obtained in the step (4), volatilizing the light oil and water to separate the light oil from the crude oil, recovering the evaporated light oil, and taking the recovered light oil as a part of the light oil added in the step (3). The method and the system for dewatering the thick oil can be used for dewatering the water-containing thick oil containing a large amount of chemical additives and mechanical impurities.
Description
Technical Field
The invention relates to the field of oil and gas treatment, in particular to a thickened oil dehydration method and a dehydration system.
Background
In the crude oil dehydration process, the lower part of the sedimentation dehydration tank is used for emulsifying the crude oil, and the crude oil is initially extracted after the measures of improving recovery ratio by adopting acid fracturing, polymer injection and the like.
The technology for the crude oil difficult to dehydrate at present mainly comprises the following steps: electric field treatment, thermal gravity sedimentation, centrifugal separation, ultrasonic treatment and the like. The electric field treatment generally has the problems that certain requirements are required on the water content of crude oil, the water content is too high, the electric dehydrator is frequently tripped to influence the normal production; the thermal gravity sedimentation has higher requirements on dehydration temperature, sedimentation time and medicament addition amount, has high treatment cost, and is difficult to play an effective role when aiming at high-viscosity high-asphaltene-content thick oil; the centrifugal separation technology has good effect on high-water-content crude oil, and has the defects of high energy consumption, incapability of continuous operation of equipment and the like because ultrahigh-speed centrifugation is often required when the water-in-oil thickened oil with water content less than 30% is dehydrated; the application of the ultrasonic treatment technology in demulsification has certain limits on ultrasonic power and ultrasonic frequency, and the effective effect on thick oil with larger property change is difficult to achieve. In conclusion, the existing alkalizing agent, high-frequency electrodeionization, demulsifier and oil-solid separation can not thoroughly solve the problem of dewatering thick oil containing a large amount of chemical additives and mechanical impurities.
Disclosure of Invention
The invention provides a method for dewatering thick oil, which can dewater water-containing thick oil containing a large amount of chemical additives and mechanical impurities.
The invention relates to a thickened oil dehydration method, which comprises the following steps:
(1) Adding water into the extracted thick oil, and uniformly mixing the crude oil and the water, so that chemical components which are soluble in water in the extracted thick oil are dissolved in the water;
(2) Performing primary water-oil separation on the mixture obtained in the step (1);
(3) Adding a light oil product and a demulsifier into the oil liquid obtained by the separation in the step (2), and heating;
(4) Settling the heated oil liquid to separate the oil from water to obtain crude oil;
(5) And (3) carrying out flash evaporation on the crude oil obtained in the step (4), volatilizing the light oil and water to separate the light oil from the crude oil, recovering the evaporated light oil, and taking the recovered light oil as a part of the light oil added in the step (3).
Preferably, the light oil is 6# solvent oil. In the step (3), the volume ratio of the light oil to the oil is 0.6-1.1.
Preferably, the method further comprises a step of heating the oil separated in the step (4) at 80-90 ℃ before the step (5).
Preferably, the pressure at which the oil is flashed is from 0.15 to 0.18Mpa.
Preferably, in step (1), water and thickened oil are thoroughly mixed by a mixer, and the mixture formed by the mixing is subjected to ultrasonic treatment to break the emulsion.
Preferably, the ultrasonic power density is 0.8 to 1.4W/L.
Preferably, the volume ratio of the thick oil to the water in the step (1) is 0.7-1.1.
Preferably, the water separated in step (4) is sent to the produced thickened oil as part of the water in step (1) to be mixed with the thickened oil, and the other part of the water in step (1) is from the purified oilfield produced water.
Preferably, the heating temperature in step (3) is 68 to 75 ℃.
The invention also provides a thickened oil dehydration system which comprises a separator, a first heating furnace for heating the oil separated by the separator, a sedimentation tank for sedimentation of the oil heated by the heating furnace, a second heating furnace for further heating the oil obtained by the sedimentation tank, and a flash evaporation tower for flash evaporation of the oil heated by the second heating furnace, wherein the flash evaporation tower is provided with a recovery device for recovering evaporated light oil in the oil.
Preferably, the thickened oil dehydration system further comprises an adding device for adding light oil products to the oil liquid separated by the separator, and the adding device is connected with the recovery device through a pipeline so as to receive the recovered light oil products.
Preferably, the thickened oil dehydration system further comprises a mixing device for mixing the produced thickened oil with water, wherein the mixing device comprises a mixer and an ultrasonic device, and the mixing device is connected with the bottom of the settling tank through a pipeline so as to receive the water separated from the settling tank. ,
compared with the prior art, the thickened oil dehydration method and the dehydration system have the following beneficial effects:
1. the method for dewatering thick oil of the invention firstly fully mixes and separates thick oil and water, separates soluble chemical additives and partial mechanical impurities in the thick oil from crude oil, thereby reducing the influence of the chemical additives and solid particles on the stability of thick oil emulsion, then reduces the viscosity of the thick oil and increases the density difference by adding volatile light oil products, promotes the separation of oil and water, and finally carries out flash evaporation. Meanwhile, the light oil can take away the residual moisture in the oil during flash evaporation, and the water content of the oil can be further reduced.
2. The thickened oil dehydration method of the invention supplements the water separated in the step (4) into the crude oil extracted in the step (1), can raise the temperature of the crude oil, is beneficial to dehydration, and can fully utilize the residual emulsifying agent in the crude oil.
Drawings
Fig. 1 is a flow chart of a method for dewatering thick oil according to an embodiment of the invention.
Detailed Description
The invention provides a method for dehydrating thick oil, which is used for dehydrating thick oil containing a large amount of chemical additives and mechanical impurities, and is suitable for dehydrating thick oil with viscosity of 1000-3000 mPas (50 ℃). Fig. 1 is a flow chart of a method for dewatering thick oil according to an embodiment of the invention. As shown in fig. 1, the heavy oil dehydration method of the present invention comprises the steps of:
(1) Adding water into the extracted thick oil, and uniformly mixing the thick oil and the water, so that chemical components which are soluble in water in the extracted thick oil are dissolved in the water;
(2) Performing primary water-oil separation on the mixture obtained in the step (1);
(3) Adding oil liquid obtained in the step (2) to have the density of less than 0.9g/cm 3 Heating the light oil and the demulsifier;
(4) Settling and separating the heated oil to obtain crude oil;
and (3) carrying out flash evaporation on the crude oil obtained in the step (4), volatilizing the light oil, simultaneously evaporating water to separate the water from the oil, recovering the evaporated light oil, and taking the recovered light oil as a part of the light oil added in the step (3).
According to the method for dewatering thick oil, disclosed by the invention, the thick oil and water are fully mixed and separated, and the soluble chemical additives and part of mechanical impurities in the thick oil are separated from the thick oil, so that the influence of the chemical additives and solid particles on the stability of thick oil emulsion is reduced, and then the state of a water-oil phase in the thick oil emulsion is broken by adding the demulsifier, so that the oil-water separation is promoted. And the light oil product which is easy to volatilize is added, so that the viscosity of the thickened oil can be reduced, the density difference between the oil liquid and the water can be increased, namely, the density of the thickened oil is reduced, the floating of the thickened oil is promoted, and the demulsification and the dehydration are promoted. And finally, carrying out flash evaporation, wherein the pressure of a container filled with oil is reduced during the flash evaporation, and the pressure is reduced to ensure that the boiling point of the light oil product is low and the oil is volatilized, so that the light oil product is separated from the oil, the volatilized light oil product can be recovered, and the light oil product can be put in the step (3) in the new heavy oil dehydration process again, thereby forming recycling. Meanwhile, the light oil can take away the residual moisture in the oil liquid during flash evaporation, and the water content of the crude oil can be further reduced.
In the step (1), water and thick oil are fully mixed by a mixer, and then the mixture is subjected to ultrasonic treatment to break emulsion, so as to break the state of water-oil encapsulation. The ultrasonic power density is preferably 0.8 to 1.4W/L. And in the step (1), the volume ratio of the thick oil to the water is more than or equal to 0.7, preferably 0.7-1.1.
In the step (2), a separator is adopted to separate the mixture, and in the step, the separator adopts a gravity sedimentation separation mode, and the separation time is 30-40min. After separation, the water is positioned below, the oil is positioned above, the step realizes the preliminary separation of water and oil, and the obtained oil is mainly in the state of oil-water emulsion.
The light oil product in the step (3) can adopt No. 6 solvent oil. The volume ratio of the light oil to the oil is preferably 0.6-1.1. The heating temperature in step (3) is preferably 68 to 75 ℃. In this embodiment, the heating in step (3) is performed in the first heating furnace, and the heating can increase the brownian motion of the oil-water molecules, promote water-water aggregation and oil-oil aggregation, and thus promote water-oil separation; secondly, the viscosity of the oil is further reduced, the density of the oil is reduced, the density difference between the oil and the water is increased, and the oil is promoted to float upwards.
The sedimentation time in the step (4) is 12-18 h. After settling, the crude oil is located above and the water is located below.
Preferably, the method further comprises a step of heating the crude oil separated in the step (4), wherein the step is performed before the step (5), and the heating is performed in a second heating furnace. The heating temperature is 80-90 ℃. When the heated oil liquid is subjected to flash evaporation, the light oil product is easier to separate from the oil.
As a preferred solution, the water separated in step (4) may also be transported to the thickened oil as part of the water in step (1) to be mixed with the thickened oil, the other part of the water in step (1) being derived from the purified oilfield produced water. The water separated in the step (4) contains part of the emulsifying agent and has higher temperature, and the water is supplemented into the thick oil extracted in the step (1), so that the temperature of the thick oil can be increased, the dehydration is facilitated, and meanwhile, the residual emulsifying agent in the water can be fully utilized.
Specific examples of the thickened oil dehydration method of the present invention are described below,
example 1
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 0.7:1 are mixed by a mixer and an ultrasonic device, the ultrasonic power density is 0.8W/L, and the residence time is 30min. Wherein the water comprises purified oilfield produced water and separated water from a settling tank.
(2) And (5) performing preliminary oil-water separation by using a separator.
(3) Adding No. 6 solvent oil with the volume being 0.6 times of that of the separated oil, adding 400mg/L demulsifier, and heating to 70 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 1 are shown in Table 1.
TABLE 1 physical Properties of thickened oil and dehydration Process related index
Example 2
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 1.1:1 is mixed with an ultrasonic device through a mixer, wherein water comprises purified oilfield produced water and separated water of a settling tank, the ultrasonic power density is 0.8W/L, and the residence time is 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume being 0.6 times of that of the separated oil, adding 400mg/L demulsifier, and heating to 70 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 2 are shown in Table 2.
TABLE 2 physical Properties of thickened oil and dehydration Process related index
Example 3
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 1:1, mixing the water with an ultrasonic device through a mixer, wherein the water comprises purified oilfield produced water and separated water of a settling tank. The ultrasonic power density was 1.1W/L and the residence time was 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume being 0.6 times of that of the separated oil, adding 400mg/L demulsifier, and heating the first heating furnace to 70 ℃.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 3 are shown in Table 3.
TABLE 3 physical Properties of thickened oil and dehydration Process related index
Example 4
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 0.8:1, mixing the water with an ultrasonic device through a mixer, wherein the water comprises purified oilfield produced water and separated water of a settling tank. The ultrasonic power density of the ultrasonic device was 1.4W/L, and the residence time was 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume being 0.6 times of that of the separated oil, adding 400mg/L demulsifier, and heating to 70 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 4 are shown in Table 4.
TABLE 4 physical Properties of thickened oil and dehydration Process related index
Example 5
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 0.9:1, mixing the water with an ultrasonic device through a mixer, wherein the water comprises purified oilfield produced water and separated water of a settling tank. The ultrasonic power density of the ultrasonic device was 1.4W/L, and the residence time was 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume being 0.9 times of the volume of the separated oil, adding 400mg/L demulsifier, and heating to 69 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 5 are shown in Table 5.
TABLE 5 physical Properties of thickened oil and dehydration Process related index
Example 6
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 1:1, mixing the water with an ultrasonic device through a mixer, wherein the water comprises purified oilfield produced water and separated water of a settling tank. The ultrasonic power density of the ultrasonic device was 1.1W/L, and the residence time was 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume 1.1 times of the volume of the separated oil, adding 400mg/L demulsifier, and heating to 71 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 6 are shown in Table 6.
TABLE 6 physical Properties of thickened oil and dehydration Process related index
Example 7
(1) The thick oil with the water content of 30 percent and water are mixed according to the volume ratio of 1:1, mixing the water with an ultrasonic device through a mixer, wherein the water comprises purified oilfield produced water and separated water of a settling tank. The ultrasonic power density of the ultrasonic device was 1.1W/L, and the residence time was 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume 1.1 times of the volume of the separated oil, adding 400mg/L demulsifier, and heating to 68 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 85 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.25MPa to finally obtain qualified crude oil. The results obtained in example 7 are shown in Table 7.
TABLE 7 physical Properties of thickened oil and dehydration Process related index
Example 8
(1) Mixing the thickened oil with 30% of water content with purified oilfield produced water and separating water from a settling tank according to the volume ratio of 1:1 are mixed by a mixer and an ultrasonic device, the ultrasonic power density is 1.1W/L, and the residence time is 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume 1.1 times of the volume of the separated oil, adding 400mg/L demulsifier, and heating to 72 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 90 ℃ by a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.15MPa to finally obtain qualified crude oil. The results obtained in example 8 are shown in Table 8.
TABLE 8 physical Properties of thickened oil and dehydration Process related index
Example 9
(1) Mixing the thickened oil with 30% of water content with purified oilfield produced water and separating water from a settling tank according to the volume ratio of 1:1 are mixed by a mixer and an ultrasonic device, the ultrasonic power density is 1.1W/L, and the residence time is 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Adding No. 6 solvent oil with the volume 1.1 times of the volume of the separated oil, adding 400mg/L demulsifier, and heating to 75 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 90 ℃ by a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.30MPa to finally obtain qualified crude oil. The results obtained in example 9 are shown in Table 9.
TABLE 9 physical Properties of thickened oil and dehydration Process related indicators
Example 10
(1) Mixing the thickened oil with 30% of water content with purified oilfield produced water and separating water from a settling tank according to the volume ratio of 1:1 are mixed by a mixer and an ultrasonic device, the ultrasonic power density is 1.1W/L, and the residence time is 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) 120# solvent oil with the volume 1.0 times of the volume of the separated oil is added into the separated oil, 400mg/L demulsifier is added into the oil, and then the oil is heated to 70 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 80 ℃ through a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.18MPa to finally obtain qualified crude oil. The results obtained in example 10 are shown in Table 10.
TABLE 10 physical Properties of thickened oil and dehydration Process related indicators
Example 11
(1) Mixing the thickened oil with 30% of water content with purified oilfield produced water and separating water from a settling tank according to the volume ratio of 1:1 are mixed by a mixer and an ultrasonic device, the ultrasonic power density is 1.1W/L, and the residence time is 30min.
(2) The mixture was subjected to preliminary oil-water separation with a separator.
(3) Toluene with the volume 1.1 times of the volume of the separated oil is added into the separated oil, 400mg/L demulsifier is added into the oil, and then the oil is heated to 70 ℃ through a first heating furnace.
(4) Settling and dewatering in a settling tank. The water which is removed is led to the step (1) and mixed with the water-containing thickened oil according to the volume ratio in the step (1).
(5) And heating the crude oil obtained by dehydration to 90 ℃ by a second heating furnace, and recovering the No. 6 solvent oil under the operating pressure of a flash tower of 0.2MPa to finally obtain qualified crude oil. The results obtained in example 11 are shown in Table 11.
TABLE 11 physical Properties of thickened oil and dehydration Process related indicators
In the invention, the No. 6 solvent oil is one of basic organic chemical raw materials, is colorless transparent liquid, volatile flammable liquid and hydrocarbon mixture, and various hydrocarbon solvents contain aliphatic hydrocarbon, aromatic hydrocarbon and cyclic hydrocarbon with different components, and the melting point is-92.5 ℃. The boiling point is 67.5 ℃, is inflammable, low in toxicity, soluble in benzene, chlorine, acetone, carbon tetrachloride and other organic solvents, but insoluble in water.
The invention also provides a thickened oil dehydration system, referring to fig. 1, the thickened oil dehydration system comprises a separator, a first heating furnace for heating oil separated by the separator, a settling tank for settling the oil heated by the heating furnace, a second heating furnace for further heating the oil obtained by the settling tank, and a flash evaporation tower for flash evaporation of the oil heated by the second heating furnace, wherein the flash evaporation tower is provided with a recovery device (not shown in the figure) for recovering evaporated light oil in the oil.
The thickened oil dehydration system can carry out final dehydration on oil products through the flash tower, and the recovery device arranged in the flash tower can recover light oil products added into oil liquid in the dehydration procedure and recycle the light oil products, thereby saving resources.
The thickened oil dehydration system further comprises an adding device (not shown in the figure) for adding light oil into the oil separated by the separator, wherein the adding device is connected with the recovery device through a pipeline to receive the recovered light oil, and the light oil can be directly conveyed to an adding position from the flash tower through the arrangement, so that the operation is simpler and more convenient.
Preferably, the heavy oil dewatering system further comprises a mixing device for mixing the extracted crude oil with water, the mixing device comprises a mixer and an ultrasonic device, the mixing device is connected with the bottom of the settling tank through a pipeline to receive water separated from the settling tank, demulsifier remains in the water separated from the settling tank, the water separated from the settling tank has a higher temperature due to a heating step in the dewatering process, the water separated from the settling tank is introduced into the mixing device, the temperature of the mixture can be increased, and the demulsifier remaining in the water can be fully utilized.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent substitutions of the invention will occur to those skilled in the art, which are within the spirit and scope of the invention.
Claims (13)
1. The method for dehydrating the thickened oil is characterized by comprising the following steps of:
(1) Adding water into the extracted thick oil, and uniformly mixing the crude oil and the water, so that chemical components which are soluble in water in the extracted thick oil are dissolved in the water;
(2) Performing primary water-oil separation on the mixture obtained in the step (1);
(3) Adding a light oil product and a demulsifier into the oil liquid obtained by the separation in the step (2), and heating;
(4) Settling the heated oil liquid to separate the oil from water to obtain crude oil;
(5) And (3) carrying out flash evaporation on the crude oil obtained in the step (4), volatilizing the light oil and water to separate the light oil from the crude oil, recovering the evaporated light oil, and taking the recovered light oil as a part of the light oil added in the step (3).
2. The method for dewatering thick oil according to claim 1, wherein the light oil is 6# solvent oil.
3. The method for dewatering thick oil according to claim 1, wherein in the step (3), the volume ratio of the light oil to the oil is 0.6-1.1.
4. The method for dehydrating thickened oil according to claim 1, further comprising a step of heating the oil separated in the step (4) at 80-90 ℃ before the step (5).
5. The method for dewatering thick oil according to claim 1, wherein the pressure of flashing the oil is 0.15-0.18 Mpa.
6. The method for dehydrating thick oil according to claim 1, wherein in the step (1), water is sufficiently mixed with the thick oil by a mixer, and the mixture formed by the mixing is subjected to ultrasonic treatment to break the emulsion.
7. The method for dewatering thick oil according to claim 6, wherein the ultrasonic power density is 0.8-1.4W/L.
8. The method for dewatering thick oil according to claim 1, wherein the volume ratio of thick oil to water in the step (1) is 0.7-1.1.
9. The method for dewatering thick oil according to claim 1, wherein the water separated in step (4) is fed to the produced thick oil as part of the water in step (1) to be mixed with the thick oil, and the other part of the water in step (1) is derived from the purified oilfield produced water.
10. The method for dewatering thick oil according to claim 1, wherein the heating temperature in the step (3) is 68 to 75 ℃.
11. The utility model provides a viscous crude dewatering system which characterized in that, includes the separator, the first heating furnace that the fluid that the separator separated was heated, the settling cask that subsides to the fluid after the heating of heating furnace, the second heating furnace that further heats the fluid that the settling cask obtained and the flash distillation tower that flash distillation was carried out to the fluid after the heating of second heating furnace, the flash distillation tower is equipped with the recovery unit who is arranged in retrieving the light oil product that is evaporated in the fluid.
12. The thickened oil dewatering system of claim 11, further comprising an addition device for adding light oil to the oil separated by the separator, the addition device being connected to the recovery device by a pipe to receive recovered light oil.
13. The thickened oil dewatering system of claim 11 further comprising a mixing device for mixing produced thickened oil with water, the mixing device comprising a mixer and an ultrasonic device, the mixing device being connected to the bottom of the settling tank by a pipe to receive water separated from the settling tank.
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