CN111115754A - Oil-water separation process for high-oil-content emulsified produced water - Google Patents
Oil-water separation process for high-oil-content emulsified produced water Download PDFInfo
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- CN111115754A CN111115754A CN202010022080.6A CN202010022080A CN111115754A CN 111115754 A CN111115754 A CN 111115754A CN 202010022080 A CN202010022080 A CN 202010022080A CN 111115754 A CN111115754 A CN 111115754A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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Abstract
The invention provides an oil-water separation process for high oil content emulsified produced water, which is characterized in that high oil content emulsified produced water separated in a gas collecting station is stored in a buried sewage tank, floating oil easy to separate is separated into oil and water through natural sedimentation, the produced water enters and exits from a produced water treatment station through an automobile hauling mode, oil-water separation is completed through adding a low-temperature demulsifier for demulsification, and the treated produced water enters an in-station produced water treatment system for treatment and reinjection under the cooperation of an oil-water separator and a three-phase separator. The invention solves the problem of oil-water transportation without gathering and transportation pipe network, the light oil easy to float upwards in the gas gathering station is pulled away, the water is gathered and transported nearby, and the operation cost is saved. The oil-water separator and the three-phase separator are arranged in the produced water treatment station, so that the problem of high-oil-content emulsified produced water treatment is solved, floating oil and most emulsified oil in the produced water are further removed through secondary demulsification oil-water separation, the oil content of the produced water is less than 0.1%, and the subsequent treatment load is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of gas field produced water treatment, and particularly relates to an oil-water separation process for high-oil-content emulsified produced water.
Background
The oil content in the produced water in the Su-Li-Ge region is high and the volume ratio is 8-32%. Along with the drainage and gas production measures of the gas field, high molecular substances such as a foam discharging agent, a corrosion inhibitor and the like enter produced water to form a large amount of oil, water and mud mixed emulsion.
At present, a settling oil removal tank is adopted in a station to separate dirty oil, incoming water treated by the station is high in oil content and serious in emulsification, and the normal operation of a produced water treatment system of a downstream treatment station is seriously influenced due to the difficulty in oil-water separation of static settling.
In the prior art, the produced water after dirty oil separation is treated by the following method: and (3) carrying out air floatation treatment on the produced water to enable oil and suspended matters in the produced water to be adhered to the air bubbles and float upwards along with the air bubbles so as to remove the oil and the suspended matters. Wherein, when the air floatation treatment is carried out. And performing water softening treatment on the oilfield produced water subjected to air floatation treatment to respectively remove residual suspended matters, calcium, magnesium and other ions which are easy to scale.
However, the prior art has at least the following problems: most of the oil and suspended matters are adhered to the bubbles in the air floatation process, and the bubbles are easy to contact with scaling-prone ions to scale in the air floatation processing equipment in the movement process, even damage the air floatation processing equipment.
Disclosure of Invention
The invention aims to provide an oil-water separation process for high-oil-content emulsified produced water, which overcomes the technical problems in the prior art.
Therefore, the technical scheme provided by the invention is as follows:
the oil-water separation process for high oil content emulsified produced water includes the first oil-water separation of the produced water in the gas collecting station, the second oil-water separation and the third oil-water separation in the water treating station, the treatment of the produced water in the water treating station, re-injection and treatment of the effluent oil separated into oil and water in the effluent oil station.
After the produced water is subjected to gas-water separation in the gas collecting station, the separated natural gas is collected and transported through a process pipeline, the separated produced water is temporarily stored in a buried sewage tank of the gas collecting station, the first oil-water separation is completed through natural sedimentation, and the floating oil easy to separate is separated.
And (4) conveying the produced water subjected to the first oil-water separation to an produced water treatment station, performing second oil-water separation by using a treatment station oil-water separator, and storing the separated sump oil in a treatment station sump oil tank.
And lifting the produced water subjected to the second oil-water separation by a treatment station booster pump, adding a demulsifier, fully mixing by a treatment station pipeline mixer, and conveying to a treatment station three-phase separator for demulsification and third oil-water separation.
The volume percentage of the oil in the produced water is 8-32%, and the volume percentage of the oil in the produced water after the oil-water separation for three times is lower than 0.1%.
After natural sedimentation for a certain time, oil and water are layered, produced water is discharged from the lower part of a buried sewage tank through a gas collecting station, collected by a water collecting system and then pulled to a produced water treatment station, and dirty oil is discharged from the upper part of the sewage tank and periodically recovered to the dirty oil treatment station through a dirty oil recovery vehicle.
And the produced water after the oil-water separation for three times enters a treatment system of the produced water of the treatment station for treatment, and the treatment process comprises air floatation treatment, filtration treatment, sterilization treatment and softening treatment which are sequentially carried out.
The treatment process of the dirty oil by the dirty oil station comprises biodegradation, heating degradation and dehydration treatment which are sequentially carried out.
The demulsifier is a low-temperature demulsifier, and the applicable temperature is not more than 5 ℃.
The produced water after the second oil-water separation is lifted to 0.3-0.4MPa by a pressure pump of a treatment station.
The invention has the beneficial effects that:
according to the oil-water separation process for the high-oil-content emulsified produced water, provided by the invention, the oil content is greatly reduced through three times of oil-water separation, and the normal operation of a treatment station produced water treatment system is ensured. The first oil-water separation solves the problem of oil-water transportation without a gathering pipe network through natural sedimentation, light oil which is easy to float upwards in the gas collecting station is pulled away, water is gathered and transported nearby, and the operation cost is saved. The oil-water separation of the second time and the oil-water separation of the third time are respectively realized by arranging a treatment station oil-water separator and a treatment station three-phase separator in the produced water treatment station, so that the problem of high oil content emulsified produced water treatment is solved, through the two-stage demulsification oil-water separation, the floating oil and most emulsified oil in the produced water are further removed, the oil content of the produced water is less than 0.1%, and the subsequent treatment load is greatly reduced.
According to the invention, the demulsification process added in the sewage tank of the upstream gas gathering station is adjusted to the downstream, so that the production operation management difficulty is reduced, the number of adding stations and management points are reduced, and the produced water is subjected to centralized demulsification and oil-water separation.
The problem of produced water going out is solved, the produced water enters a produced water system through the tail end to be treated and reinjected, the produced water is brought out of the ground along with natural gas development, and the produced water is reinjected into a closed loop of a stratum after being treated.
Most of the oil is floated and most of the suspended matters are sunk through sedimentation treatment in the earlier stage of the produced water, and a large amount of oil is removed through oil-water separation twice, so that a large amount of oil and a large amount of suspended matters are removed, and the scale formation of the large amount of oil, the large amount of suspended matters, calcium, magnesium and other easily-scaling ions in the air flotation treatment equipment in the air flotation treatment of the produced water treatment system of the treatment station is avoided.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a process flow diagram of the present invention.
In the figure:
description of reference numerals:
1. the gas collecting station is buried in a sewage tank; 2. a treatment station oil-water separator; 3. a treatment station booster pump; 4. a processing station pipeline mixer; 5. a processing station three-phase separator; 6. a treatment station produced water treatment system; 7. and (4) processing the dirty oil tank of the station.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides a high oil content emulsified produced water oil-water separation process, produced water is subjected to gas-water separation at a gas collecting station, the separated produced water is subjected to first oil-water separation in the gas collecting station, then, second oil-water separation and third oil-water separation are performed at a produced water treatment station, the produced water after the third oil-water separation enters a treatment station produced water treatment system 6 for treatment and then is reinjected, and dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
In order to solve the problems of demulsification and oil-water separation, incoming water is pretreated by a high-oil-content emulsified produced water oil-water separation process at the front end of a produced water treatment system 6 of a treatment station, so that the requirements of the produced water treatment system 6 of a downstream treatment station are met. The high oil content emulsified produced water means that the volume percentage of oil in the produced water is 8-32%, and the oil content of the produced water treated by the process is less than 0.1%, so that the subsequent treatment load is greatly reduced.
The process solves the problem of produced water outlet, and the produced water enters the produced water system through the tail end to be treated and reinjected, so that the produced water is brought out of the ground along with natural gas development, and is reinjected into a closed loop of a stratum after treatment.
Example 2:
the embodiment provides a high oil content emulsified produced water oil-water separation process, produced water is subjected to gas-water separation at a gas collecting station, the separated produced water is subjected to first oil-water separation in the gas collecting station, then, second oil-water separation and third oil-water separation are performed at a produced water treatment station, the produced water after the third oil-water separation enters a treatment station produced water treatment system 6 for treatment and then is reinjected, and dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
The produced water is subjected to gas-water separation in the gas collecting station, the separated natural gas is collected and transported through a process pipeline, the separated produced water is temporarily stored in the buried sewage tank 1 of the gas collecting station, the first oil-water separation is completed through natural sedimentation, and the floating oil easy to separate is separated.
The invention solves the problem of oil-water transportation without gathering pipe network: the process avoids the problem of oil-water transportation, the light oil which is easy to float upwards in the gas collecting station is pulled away, the water is collected and transported nearby, and the operation cost is saved.
Example 3:
the embodiment provides a high oil content emulsified produced water oil-water separation process, produced water is subjected to gas-water separation at a gas collecting station, the separated produced water is subjected to first oil-water separation in the gas collecting station, then, second oil-water separation and third oil-water separation are performed at a produced water treatment station, the produced water after the third oil-water separation enters a treatment station produced water treatment system 6 for treatment and then is reinjected, and dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
Wherein, the produced water after the first oil-water separation is transported to a produced water treatment station, the oil-water separation is carried out for the second time by the oil-water separator 2 of the treatment station, and the separated sump oil is stored in a sump oil tank 7 of the treatment station.
The produced water enters a station for unloading in an automobile hauling mode and enters the oil-water separator 2 of the treatment station to complete oil-water separation, thereby creating conditions for downstream treatment.
Example 4:
the embodiment provides a high oil content emulsified produced water oil-water separation process, produced water is subjected to gas-water separation at a gas collecting station, the separated produced water is subjected to first oil-water separation in the gas collecting station, then, second oil-water separation and third oil-water separation are performed at a produced water treatment station, the produced water after the third oil-water separation enters a treatment station produced water treatment system 6 for treatment and then is reinjected, and dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
And (3) lifting the produced water subjected to the second oil-water separation by using a treatment station booster pump 3, adding a demulsifier, fully mixing by using a treatment station pipeline mixer 4, and conveying to a treatment station three-phase separator 5 for demulsification and third oil-water separation.
Wherein the demulsifier is a low-temperature demulsifier, and the applicable temperature is not more than 5 ℃. The produced water after the second oil-water separation is lifted to 0.3-0.4MPa by a pressure pump 3 of a treatment station.
According to the invention, the demulsification process added in the sewage tank of the gas collection station is adjusted to the downstream, the number of adding stations and management points are reduced, the produced water is subjected to centralized demulsification and oil-water separation, and the difficulty in production operation management is reduced.
The invention solves the problem of treatment of high oil content emulsified produced water, the treatment station oil-water separator 2 and the treatment station three-phase separator 5 are arranged in the station, floating oil and most emulsified oil in the produced water are further removed through secondary demulsification oil-water separation, the oil content of the produced water is less than 0.1%, and the subsequent treatment load is greatly reduced.
Example 5:
the embodiment provides a high oil content emulsified produced water oil-water separation process, produced water is subjected to gas-water separation at a gas collecting station, the separated produced water is subjected to first oil-water separation in the gas collecting station, then, second oil-water separation and third oil-water separation are performed at a produced water treatment station, the produced water after the third oil-water separation enters a treatment station produced water treatment system 6 for treatment and then is reinjected, and dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
After the produced water is subjected to gas-water separation in the gas collecting station, the separated natural gas is collected and transported through a process pipeline, the separated produced water is temporarily stored in a buried sewage tank 1 of the gas collecting station, the first oil-water separation is completed through natural sedimentation, and the floating oil easy to separate is separated.
After a certain period of natural sedimentation, oil and water are layered, produced water is discharged from the lower part of the buried sewage tank 1 through the gas collecting station, collected by the water collecting system and then pulled to the produced water treatment station, and dirty oil is discharged from the upper part of the sewage tank and periodically recovered to the dirty oil treatment station through the dirty oil recovery vehicle.
Example 6:
on the basis of embodiment 4, the embodiment provides an oil-water separation process for high oil content emulsified produced water,
the produced water after the oil-water separation for three times enters a treatment station produced water treatment system 6 for treatment, and the treatment process comprises air floatation treatment, filtration treatment, sterilization treatment and softening treatment which are sequentially carried out.
Because the produced water is settled in the earlier stage, most of the oil floats upwards, most of the suspended matters sink, and a large amount of oil is removed through oil-water separation twice, so that a large amount of oil and a large amount of suspended matters are removed, and the scale formation of the large amount of oil, the large amount of suspended matters, calcium, magnesium and other easily-scaling ions in the air-flotation treatment equipment in the air-flotation treatment is avoided. Residual oil and suspended matters in the produced water after the three times of oil-water separation are adhered to the bubbles and removed through air floatation treatment. And the gas-liquid ratio is controlled to be less than 1.5-2.5: 0.5-1.5, so that the volume of the bubbles is reduced, and the bubbles are further prevented from carrying large-volume suspended matters and oil to form scales in the air floatation treatment equipment. The suspended matter is further removed by filtration treatment. Removing easy scaling ions such as calcium, magnesium and the like through water softening treatment.
Example 7:
the embodiment provides a high oil content emulsified produced water oil-water separation process, produced water is subjected to gas-water separation at a gas collecting station, the separated produced water is subjected to first oil-water separation in the gas collecting station, then, second oil-water separation and third oil-water separation are performed at a produced water treatment station, the produced water after the third oil-water separation enters a treatment station produced water treatment system 6 for treatment and then is reinjected, and dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
The treatment process of the dirty oil by the dirty oil station comprises biodegradation, heating degradation and dehydration treatment which are sequentially carried out.
Through biodegradable pond, heating degradation jar and dehydration jar with sump oil treatment process distinguish the classification, reduce the sump oil and handle the degree of difficulty, improve the concentrated recovery processing effect to all impurities in the sump oil, reduce the emission of pollutant, increase the output of recovered oil, further improve sump oil recovery processing's efficiency.
Example 8:
the embodiment provides an oil-water separation process for high oil content emulsified produced water, which comprises the following steps as shown in figure 1:
1) water collection: in the Su Li Ge area, gas-water separation is completed in a gas collecting station, and after separation, natural gas is collected and transported through a process pipeline. The produced water after separation is temporarily stored in a buried sewage tank 1 of a gas gathering station, floating oil easy to separate is subjected to oil-water separation through natural sedimentation, dirty oil in the buried tank is periodically recovered through a dirty oil recovery vehicle, and the average water volume of the produced water in the tank is 10m3D, the minimum delivery volume of the pipeline system cannot be reached, and the water collecting system mostly adopts an automobile pulling mode to a nearby extraction water treatment station;
as shown in fig. 1, the produced water treatment station comprises a treatment station oil-water separator 2, a treatment station pressure pump 3, a treatment station pipeline mixer 4, a treatment station three-phase separator 5 and a treatment station produced water treatment system 6 which are connected in sequence, wherein dirty oil outlets of the treatment station oil-water separator 2 and the treatment station three-phase separator 5 are communicated with a treatment station dirty oil tank 7;
2) demulsifying and separating oil from water: the produced water enters a station for unloading in an automobile hauling mode and enters the oil-water separator 2 of the treatment station to complete oil-water separation, thereby creating conditions for downstream treatment. Sump oil recovered by the oil-water separator 2 of the treatment station enters a sump oil tank 7 of the treatment station for storage, produced water in the oil-water separator 2 of the treatment station is lifted by a pressure pump 3 of the treatment station, and meanwhile, a low-temperature demulsifier is added, fully mixed by a pipeline mixer 4 of the treatment station and then conveyed to a three-phase separator 5 of the treatment station to complete demulsification and oil-water separation. And the sump oil recovered by the treatment station three-phase separator 5 enters a treatment station sump oil tank 7 for storage, and the produced water separated by the treatment station three-phase separator 5 enters a treatment station produced water treatment system 6 for treatment and reinjection.
3) And the sump oil recovered in the gas gathering station and the produced water treatment station is transported to the sump oil treatment station by an automobile hauling way for treatment and sale.
In conclusion, the oil-water separation process for the high-oil-content emulsified produced water provided by the invention solves the problem that oil and water are transported together when no gathering and transportation pipe network exists: the process avoids the problem of oil-water transportation, the light oil which is easy to float upwards in the gas collecting station is pulled away, the water is collected and transported nearby, and the operation cost is saved. The production operation management difficulty is reduced, the demulsification process is added into the sewage tank of the upstream gas gathering station and adjusted to the downstream, the number of adding stations and management points are reduced, and the produced water is subjected to centralized demulsification and oil-water separation.
The treatment station oil-water separator 2 and the treatment station three-phase separator 5 are arranged in the produced water treatment station, so that the problem of high-oil-content emulsified produced water treatment is solved, floating oil and most emulsified oil in produced water are further removed through secondary demulsification oil-water separation, the oil content of the produced water is less than 0.1%, and the subsequent treatment load is greatly reduced.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A high oil content emulsified produced water oil-water separation process is characterized in that: the produced water is subjected to gas-water separation in the gas collecting station, the produced water is separated out, first oil-water separation is carried out in the gas collecting station, then second oil-water separation and third oil-water separation are carried out in the produced water treatment station, the produced water subjected to the third oil-water separation enters a treatment station produced water treatment system (6) for treatment and then is reinjected, and the dirty oil separated from oil water each time is sent to a dirty oil station for treatment.
2. The oil-water separation process of the high oil content emulsified produced water according to claim 1, which is characterized in that: after the produced water is subjected to gas-water separation in the gas collecting station, the separated natural gas is collected and transported through a process pipeline, the separated produced water is temporarily stored in a buried sewage tank (1) of the gas collecting station, the first oil-water separation is completed through natural sedimentation, and the floating oil easy to separate is separated.
3. The oil-water separation process of the high oil content emulsified produced water according to claim 1, which is characterized in that: and (3) conveying the produced water subjected to the first oil-water separation to a produced water treatment station, performing second oil-water separation by using an oil-water separator (2) of the treatment station, and storing the separated sump oil in a sump oil tank (7) of the treatment station.
4. The oil-water separation process of the high oil content emulsified produced water according to claim 1, which is characterized in that: and (3) lifting the produced water subjected to the second oil-water separation by a treatment station booster pump (3), adding a demulsifier, fully mixing by a treatment station pipeline mixer (4), and conveying to a treatment station three-phase separator (5) for demulsification and third oil-water separation.
5. The oil-water separation process of the high oil content emulsified produced water according to claim 1, which is characterized in that: the volume percentage of the oil in the produced water is 8-32%, and the volume percentage of the oil in the produced water after the oil-water separation for three times is lower than 0.1%.
6. The oil-water separation process of the high oil content emulsified produced water according to claim 2, characterized in that: after natural sedimentation for a certain time, oil and water are layered, produced water is discharged from the lower part of the buried sewage tank (1) of the gas collecting station, collected by the water collecting system and then pulled to the produced water treatment station, and dirty oil is discharged from the upper part of the sewage tank and periodically recovered to the dirty oil treatment station by the dirty oil recovery vehicle.
7. The oil-water separation process of the high oil content emulsified produced water according to claim 1, which is characterized in that: the produced water after the oil-water separation for three times enters a treatment system (6) of the produced water of a treatment station for treatment, and the treatment process comprises air floatation treatment, filtration treatment, sterilization treatment and softening treatment which are sequentially carried out.
8. The oil-water separation process of the high oil content emulsified produced water according to claim 1, which is characterized in that: the treatment process of the dirty oil by the dirty oil station comprises biodegradation, heating degradation and dehydration treatment which are sequentially carried out.
9. The oil-water separation process of the high oil content emulsified produced water according to claim 4, which is characterized in that: the demulsifier is a low-temperature demulsifier, and the applicable temperature is not more than 5 ℃.
10. The oil-water separation process of the high oil content emulsified produced water according to claim 4, which is characterized in that: the produced water after the second oil-water separation is lifted to 0.3-0.4MPa by a pressure pump (3) of the treatment station.
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