CN113323645A - Separation method and separation device for oil, gas and water at well mouth and application of separation device - Google Patents
Separation method and separation device for oil, gas and water at well mouth and application of separation device Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 212
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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Abstract
The invention discloses a separation method of oil, gas and water at a wellhead, a separation device and application thereof.A first-stage cyclone separator has an inlet end connected with a single-well mixed liquid recovery output end; the first-stage cyclone separator can separate the mixed liquid collected from the single well into a first oil-gas mixed liquid and a first water-rich mixture, an oil-gas outlet and a sewage outlet of the first-stage cyclone separator are connected with the first-stage gravity separator, the first-stage gravity separator can separate the first oil-gas mixed liquid and the first water-rich mixture into a second oil-gas mixed liquid and a second water-rich mixture, the sewage outlet of the first-stage gravity separator is connected with the second-stage cyclone separator, the second-stage cyclone separator can separate the second water-rich mixture into a rich oil mixture and a third water-rich mixture, the oil-gas outlet and the sewage outlet of the second-stage gravity separator are connected with the second-stage gravity separator, and the second-stage gravity separator can separate the rich oil mixture and the third water-rich mixture into a third oil-gas mixed liquid and water. The device solves the problem of high oil extraction, collection and transportation cost.
Description
Technical Field
The invention relates to separation of petroleum, in particular to a separation method, a separation device and application of wellhead oil, gas and water.
Background
Oil field development is common on the land of China, and oil production wells (stations) in the oil fields spread on the land where the whole county is boundless and ridges are staggered in a star-and-star manner; each oil production station usually comprises 1-5 single wells, produced liquid of each single well is gathered in the oil production station, and because a set of complete gathering and transportation pipeline for connecting each oil production station and an oil production plant is not established, an oil production collection vehicle is required to go back and forth periodically and collect intensively; the oil extraction station is provided with the storage tank, and the produced liquid is not subjected to oil-water separation to a certain degree, so that the oil extraction collection vehicle has to collect all the produced liquid and transport the produced liquid back and forth; likewise, for the reinjection water, it must also be transported to and from via special transport vehicles; therefore, the oil extraction and transportation cost, the reinjection water cost, the post-treatment cost of untreated crude oil with medium and high water content, the management cost caused by the post-treatment cost and the like are high.
Generally, an oil-gas-water separation process and device are an important treatment process and device in the oil field exploitation and post-treatment processes, and directly affect the water content of external crude oil and the oil content of sewage. Through many years of research and research at home and abroad, various oil-water separation technologies such as a thermal sedimentation separation method, an electrochemical method, a high-frequency pulse method, a microwave radiation method, a biological method, pipeline gravity sedimentation, cyclone separation and the like are obtained.
Wherein, the prior oil field is commonly used by a mixing process combining a thermal sedimentation separation method and a chemical demulsification method. The mixing process comprises the following steps: firstly, adding a chemical demulsifier (namely a dosing process) into the crude oil emulsion produced liquid to reduce the interfacial film strength and interfacial tension of emulsified water drops, prevent further emulsification of an oil-water mixture, destroy the formed crude oil emulsion, reduce the viscosity of the oil-water mixture, accelerate oil-water separation, and destroy the condensation of the interfacial film at the periphery of the emulsified water drops, so that the water drops are merged and the particle size is increased to achieve the purpose of oil-water delamination; then, the mixed liquid added with the emulsifier is introduced into a special heating settler for thermal sedimentation separation (namely a boiler heating process), wherein the heating aims to reduce the oil-water interfacial tension, increase the solubility of oil-water phases relative to the emulsifier, weaken an emulsion liquid film to facilitate coalescence, reduce the viscosity of crude oil, increase molecular thermal motion, facilitate liquid bead coalescence and improve the dehydration efficiency; then the water in the emulsion is naturally settled by utilizing the difference of the oil-water density after heating and the action of gravity, thereby achieving the effect of oil-water separation.
The traditional mixing process can effectively remove most of suspended water in the crude oil, and the equipment is simple and easy to operate; however, the method has the problems of large scale of sedimentation equipment, long time consumption in the sedimentation process, high energy consumption caused by heating and environmental protection caused by adding a large amount of chemical agents.
Disclosure of Invention
The invention aims to provide a separation method and a separation device for oil, gas and water at a wellhead and application thereof, and aims to solve the problems of high oil extraction and gathering cost, high crude oil post-treatment cost, high reinjection water cost, large oil-water separation scale, long oil-water separation time consumption, high oil-water separation energy consumption and no environmental protection of oil-water separation in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a separation device of wellhead oil, gas and water comprises a primary cyclone separator, a primary gravity separator, a secondary cyclone separator and a secondary gravity separator; the inlet end of the primary cyclone separator is connected with the output end of the single-well collected mixed liquid; the first-stage cyclone separator can separate the single-well recovery mixed liquid into a first oil-gas mixed liquid and a first water-rich mixture, an oil-gas outlet and a sewage outlet of the first-stage cyclone separator are respectively connected with an inlet end of the first-stage gravity separator, the first-stage gravity separator can separate the first oil-gas mixed liquid and the first water-rich mixture into a second oil-gas mixed liquid and a second water-rich mixture, a sewage outlet of the first-stage gravity separator is connected with an inlet end of the second-stage gravity separator, the second-stage cyclone separator can separate the second water-rich mixture into an oil-rich mixture and a third water-rich mixture, an oil-gas outlet and a sewage outlet of the second-stage gravity separator are respectively connected with an inlet end of the second-stage gravity separator, and the second-stage gravity separator can separate the oil-rich mixture and the third water-rich mixture into a third oil-gas mixed liquid and water, and oil-gas outlets of the first-stage gravity separator and the second-stage gravity separator are connected with an oil-gas storage mechanism to collect the second oil-gas mixed liquid and the third oil-gas mixed liquid, and a water outlet of the second-stage gravity separator is connected with a water storage mechanism.
As a preferable scheme of the invention, the separation device for oil, gas and water at the wellhead further comprises a coalescing mechanism, the coalescing mechanism is arranged between a water outlet of the second-stage gravity separator and the water storage mechanism, and the coalescing mechanism can perform fine oil-water separation on the water separated by the second-stage gravity separator.
In a preferred embodiment of the present invention, the first stage cyclone separator and the second stage cyclone separator are each independently selected from one of a side-inlet cyclone and a bottom-inlet spiral-guided cyclone.
As a preferable scheme of the present invention, the primary gravity separator and the secondary gravity separator are both provided with two inlet ends;
an oil-gas outlet of the first-stage cyclone separator is connected with one inlet end of the first-stage gravity separator, and a sewage outlet of the first-stage cyclone separator is connected with the other inlet end of the first-stage gravity separator;
and an oil-gas outlet of the second-stage cyclone separator is connected with one inlet end of the second-stage gravity separator, and a sewage outlet of the second-stage cyclone separator is connected with the other inlet end of the second-stage gravity separator.
As a preferred scheme of the present invention, the first-stage gravity separator and the second-stage gravity separator each include a multi-layer horizontal pipeline and a multi-stage vertical pipeline, and the vertical pipeline is communicated with the horizontal pipeline; the oil gas pipeline comprises a top layer horizontal pipeline, a bottom layer horizontal pipeline, an oil gas outlet A, a water outlet A and a water outlet A, wherein the inlet ends are respectively arranged at one end of the top layer horizontal pipeline and one end of the bottom layer horizontal pipeline, the oil gas outlet A is arranged at the other end of the top layer horizontal pipeline, and the water outlet A is arranged on the bottom layer horizontal pipeline.
As a preferable scheme of the invention, the bottommost horizontal pipeline is also provided with a sewage draining outlet, and the sewage draining outlet is connected with a sewage draining pipeline.
In a preferred embodiment of the present invention, the coalescing mechanism is provided with a porous medium material.
The invention also provides application of the wellhead oil-gas-water separation device in wellhead oil-gas-water separation, crude oil produced liquid oil-water pre-separation and crude oil produced liquid post-treatment fine oil-water separation.
The invention further provides a separation method of wellhead oil, gas and water, which comprises the following steps:
the method comprises the following steps: outputting single-well produced liquid from a well mouth, and then carrying out primary cyclone gas-liquid separation to obtain a first oil-gas mixed liquid and a first water-rich mixture;
step two: performing primary gravity oil-water separation on the first oil-gas mixed solution and the first water-rich mixture to obtain a second oil-gas mixed solution and a second water-rich mixture, and collecting the second oil-gas mixed solution;
step three: performing secondary cyclone oil-water separation on the second water-rich mixture to obtain an oil-rich mixture and a third water-rich mixture;
step four: and performing secondary gravity oil-water separation on the oil-rich mixture and the third water-rich mixture to obtain a third oil-gas mixed solution and water, and respectively collecting the third oil-gas mixed solution and the water.
As a preferable mode of the present invention, after the fourth step, the separation method further comprises subjecting the water to a coalescence treatment to finely separate the water.
As a preferable mode of the present invention, the coalescence treatment treats the water with a porous medium material.
Compared with the prior art, the invention has the following improvement points:
1) the crude oil is recovered from a single well and then separated from oil, gas and water on the spot to obtain oil-gas mixture with high purity and water with high purity, wherein the oil-gas mixture with high purity can be transported for further treatment, and the water with high purity can be used as reinjection water.
2) In the separation method and the separation device, two-stage cyclone separation and two-stage gravity separation are adopted, wherein the cyclone separation realizes oil-water separation by adopting spiral flow or under the coupling action of inertial centrifugal force and viscous force, and the center of the cyclone is an oil core with higher concentration; the gravity type separation adopts layered flow, and oil-gas-water gravity separation is realized under the action of gravity buoyancy.
The cyclone separation and the gravity separation have the advantages of simple structure, small occupied area, quick and efficient oil-water separation, simple and convenient operation, easy production standardization and scale and greatly reduced production cost relative to a tank-type separator. In addition, the cyclone separation and the gravity separation do not need additional heating or adding a medicinal reagent, so that the energy consumption required by heating in the later advanced treatment is reduced, and the characteristics of low energy consumption and environmental protection are ensured.
In conclusion, the separation method and the separation device provided by the invention can realize the rapid separation of oil, gas and water on site in a single-well oil production station, improve the oil content of the produced liquid collected by an oil extraction collection vehicle, reduce the oil content of the separated water, even realize the on-site reinjection of the separated water, and obviously reduce the water content of the collected oil, thereby reducing the round trip times of an oil extraction or water injection transport vehicle and the related costs, realizing the requirements of energy conservation and emission reduction, greatly reducing the round trip transport cost of single-well oil extraction, reducing the treatment cost of crude oil at the later stage of collection and transportation and the management cost of the whole process, and achieving the purposes of reducing cost, improving efficiency and improving environmental protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a flow chart of a wellhead oil-gas-water separation method provided by the invention;
FIG. 2 is a block diagram of a preferred embodiment of the wellhead oil-gas-water separation device provided by the invention;
FIG. 3 is a schematic structural diagram of a preferred embodiment of the wellhead oil-gas-water separation device provided by the invention;
fig. 4 is a schematic structural diagram of a preferred embodiment of the primary gravity separator or the secondary gravity separator of fig. 3.
The reference numerals in the drawings denote the following, respectively:
1. single well mixed liquid recovery output end 2, oil gas storage mechanism
3. Water storage mechanism 4, connect blowdown pipeline
5. The topmost horizontal pipeline 6 and the vertical pipeline
7. The bottommost layer horizontal pipeline 8 and the water outlet A
9. Oil gas outlet A10 and sewage outlet
CA. First-stage cyclone separator CB and second-stage cyclone separator
CP, coalescence mechanism T1, first-stage gravity separator
T2, two-stage gravity separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a separation device of wellhead oil, gas and water, which is shown in figures 2-3 and comprises a primary cyclone separator CA, a primary gravity separator T1, a secondary cyclone separator CB and a secondary gravity separator T2; the inlet end of the first-stage cyclone separator CA is connected with the single-well mixed liquor recovery output end 1; the first-stage cyclone separator CA can separate the single-well recovery mixed liquid into a first oil-gas mixed liquid and a first water-rich mixture, an oil-gas outlet and a sewage outlet of the first-stage cyclone separator CA are respectively connected with an inlet end of the first-stage gravity separator T1, the first-stage gravity separator T1 can separate the first oil-gas mixed liquid and the first water-rich mixture into a second oil-gas mixed liquid and a second water-rich mixture, a sewage outlet of the first-stage gravity separator T1 is connected with an inlet end of the second-stage cyclone separator CB, the second-stage cyclone separator CB can separate the second water-rich mixture into an oil-rich mixture and a third water-rich mixture, an oil-gas outlet and a sewage outlet of the second-stage gravity separator CB are respectively connected with an inlet end of the second-stage gravity separator T2, and the second-stage gravity separator T2 can separate the oil-rich mixture and the third water-rich mixture into a third oil-gas mixed liquid and water, oil gas outlets of the first-stage gravity separator T1 and the second-stage gravity separator T2 are connected with an oil gas storage mechanism 2 to collect the second oil gas mixed liquid and the third oil gas mixed liquid, and a water outlet of the second-stage gravity separator T2 is connected with a water storage mechanism 3.
In the above separation device, the water separated by the second gravity separator T2 has high purity, but there is still a very small amount of oil and gas in the water, and in order to further improve the purity of the water, so that it can further meet the requirement of reinjection water, preferably, as shown in fig. 2-3, the separation device for wellhead oil, gas and water further includes a coalescing mechanism CP, which is disposed between the water outlet of the second gravity separator T2 and the water storage mechanism 3, and the coalescing mechanism CP can finely separate the water separated by the second gravity separator T2 from oil and water. As can be seen from fig. 3, the two-stage gravity separator T2 can be connected directly to the water storage means 3, or can be connected to the water storage means 3 through the coalescing means CP, with two options. The oil-water fine separation is realized by the coalescence mechanism CP under the condition of different oil-water adhesive forces, so that the oil-water separation efficiency is improved better.
In the above embodiment, the principle of oil-water separation of the coalescing means may also be selected within a wide range, but in order to further enhance the oil-water separation effect, it is preferable that the coalescing means is provided with a porous medium material. The porous medium material adsorbs coalesced residues and tiny oil drops in sewage to be treated by utilizing the difference of physical properties that the viscosity of an oil phase is far higher than that of a water phase, so that the fine oil-water separation is realized.
Here, the kind of the porous medium material is not particularly limited in the present invention, but in order to further improve the oil-water separation effect, it is preferable that the porous medium material is selected from granular media (such as quartz sand), oleophilic fibers, diatomaceous earth, coke, activated carbon, and the like.
Meanwhile, the structure of the coalescing mechanism CP is not particularly limited in the present invention, but in order to further improve the oil-water separation effect and efficiency, it is preferable that the coalescing mechanism CP has a tubular structure. -
In the present invention, the structures of the first-stage cyclone CA and the second-stage cyclone CB are not particularly limited, but in order to further improve the cyclone separation effect, it is preferable that the first-stage cyclone CA and the second-stage cyclone CB are each independently selected from one of a side-inlet cyclone and a bottom-inlet spiral-guiding cyclone. In fig. 3, the first-stage cyclone separator CA is a side inlet cyclone, and the second-stage cyclone separator CB is a bottom inlet spiral guide cyclone. No matter the cyclone is laterally imported or spirally guided at the bottom, the oil-water separation is realized through spiral flow or under the coupling action of inertial centrifugal force and viscous force, and the center of the cyclone is oil nuclei with higher concentration.
In the above embodiment, the connection manner of the oil gas outlet and the sewage outlet of the primary cyclone CA to the inlet end of the primary gravity separator T1, respectively, and the connection manner of the oil gas outlet and the sewage outlet of the secondary cyclone CB to the secondary gravity separator T2, respectively, can be selected within a wide range, but in order to further improve the oil-water separation effect, preferably, the primary gravity separator T1 and the secondary gravity separator T2 are provided with two inlet ends; an oil-gas outlet of the primary cyclone separator CA is connected with one inlet end of the primary gravity separator T1, and a sewage outlet of the primary cyclone separator CA is connected with the other inlet end of the primary gravity separator T1; an oil-gas outlet of the secondary cyclone separator CB is connected with one inlet end of the secondary gravity separator T2, and a sewage outlet of the secondary cyclone separator CB is connected with the other inlet end of the secondary gravity separator T2.
Therefore, the oil-rich mixture and the water-rich mixture generated by the first-stage cyclone CA and the second-stage cyclone CB respectively enter the first-stage gravity separator T1 or the second-stage gravity separator T2 through two inlet ends, so that the oil-rich mixture and the water-rich mixture are not emulsified and fused again, and the oil-water separation effect of the first-stage gravity separator T1 and the second-stage gravity separator T2 is ensured.
The structures of the first-stage gravity separator T1 and the second-stage gravity separator T2 are various, but from the viewpoint of reducing energy consumption, it is preferable that the first-stage gravity separator T1 and the second-stage gravity separator T2 are each independently a pipeline gravity separator.
On the basis of the above embodiment, in order to further improve the oil-water separation effect of the first-stage gravity separator T1 and the second-stage gravity separator T2, preferably, as shown in fig. 4, each of the first-stage gravity separator T1 and the second-stage gravity separator T2 includes a multi-layer horizontal pipe and a multi-layer vertical pipe 6, and the vertical pipe 6 and the horizontal pipe are communicated with each other; the oil-gas pipeline comprises a topmost horizontal pipeline 5, a bottommost horizontal pipeline 7, an oil-gas outlet A9, an oil-gas outlet A8 and a water outlet A8, wherein the oil-gas outlet A9 is formed in one end of the topmost horizontal pipeline 5 and one end of the bottommost horizontal pipeline 7 respectively. The oil-gas outlet A9 is an oil-gas outlet of the first-stage gravity separator T1 or an oil-gas outlet of the second-stage gravity separator T2, and the water outlet A8 is a water outlet of the first-stage gravity separator T1 or a water outlet of the second-stage gravity separator T2.
Due to the large difference in density of the oil, gas and water three phases, in the embodiment, the oil-rich mixture mainly flows in the upper layer, the water-rich mixture mainly flows in the lower layer, and the water and the oil move downwards and upwards under the action of gravity in the flowing process of the oil-rich mixture and the water-rich mixture, so that the efficient separation of oil and water is realized.
In the above embodiment, in order to collect the sewage efficiently, it is preferable that the lowest horizontal pipe 7 is further provided with a sewage discharge outlet 10, and the sewage discharge outlet 10 is connected to the sewage receiving and discharging line 4. The sewage draining outlet 10 can discharge a small amount of impurities (such as silt) deposited in the pipeline periodically during production operation, and can drain fluid in the pipeline during production stoppage and maintenance. In the present invention, in order to further facilitate the control of the opening and closing of the respective lines in the apparatus, it is preferable to provide control valves between the respective elements, such as the control valve between the primary cyclone CA and the primary gravity separator T1, the control valve between the primary cyclone CA and the secondary cyclone CB, and the control valve between the secondary cyclone CB and the secondary gravity separator T2 in fig. 3.
In conclusion, after the single-well produced fluid is treated by the separation device, almost all the discharged fluid in the water outlet pipe of the secondary gravity separator T2 finally contains free water; the free water discharged liquid can be directly used as reinjection water through a branch pipeline; and the residual discharge liquid (namely the second oil-gas mixed liquid and the third oil-gas mixed liquid) which has the oil content remarkably increased and flows out from the top oil outlet pipe can still enter other treatment facilities through the original pipeline or be subjected to advanced treatment according to the traditional or other oil-water process flows.
According to the description, the wellhead oil-gas-water separation device can be applied to oil fields on site, but the oil-gas separation is far away, the wellhead oil-gas-water separation device can also have other purposes, and in order to expand the application scope of the wellhead oil-gas-water separation device, the wellhead oil-gas-water separation device can be applied to wellhead oil-gas-water separation, crude oil produced liquid oil-water pre-separation and crude oil produced liquid post-treatment fine oil-water separation.
The invention further provides a separation method of wellhead oil gas water, which comprises the following steps of:
the method comprises the following steps: outputting single-well produced liquid from a well mouth, and then carrying out primary cyclone gas-liquid separation to obtain a first oil-gas mixed liquid and a first water-rich mixture;
step two: performing primary gravity oil-water separation on the first oil-gas mixed solution and the first water-rich mixture to obtain a second oil-gas mixed solution and a second water-rich mixture, and collecting the second oil-gas mixed solution;
step three: performing secondary cyclone oil-water separation on the second water-rich mixture to obtain an oil-rich mixture and a third water-rich mixture;
step four: and performing secondary gravity oil-water separation on the oil-rich mixture and the third water-rich mixture to obtain a third oil-gas mixed solution and water, and respectively collecting the third oil-gas mixed solution and the water.
According to the method, the separated water can be reinjected on site, the water content in the collected oil is obviously reduced, and the oil-water separation effect is improved. Meanwhile, the method does not need to use extra heating or add medicinal reagents, and reduces the energy consumption required by heating in the later advanced treatment, thereby ensuring that the method has the characteristics of low energy consumption and environmental protection.
In the above method, in order to make the separated water more pure so as to meet the criteria of reinjection water, preferably, after the fourth step, the separation method further comprises subjecting the water to a coalescence treatment to finely separate the water. The coalescence treatment realizes the fine oil-water separation under the condition of different oil-water viscosity and adhesive force, thereby better improving the oil-water separation efficiency.
On the basis of the above embodiment, in order to further enhance the coalescence effect of the coalescence treatment, it is preferable that the coalescence treatment treats the water by a porous medium material. The porous medium material adsorbs coalesced residues and tiny oil drops in sewage to be treated by utilizing the difference of physical properties that the viscosity of an oil phase is far higher than that of a water phase, so that the fine oil-water separation is realized. Among them, the kind of the porous medium material may be selected in a wide range, but in order to further improve the oil-water separation effect, it is preferable that the porous medium material is selected from granular media (such as quartz sand), oleophilic fibers, diatomaceous earth, coke, activated carbon, and the like.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. The utility model provides a separator of well head oil gas water which characterized in that: the separation device of the wellhead oil, gas and water comprises a primary cyclone separator (CA), a primary gravity separator (T1), a secondary cyclone separator (CB) and a secondary gravity separator (T2); the inlet end of the primary cyclone separator (CA) is connected with the single-well mixed liquor recovery output end (1); the single well recovery mixed liquor can be separated into first oil-gas mixed liquor and first water-rich mixture by the primary cyclone separator (CA), an oil-gas outlet and a sewage outlet of the primary cyclone separator (CA) are respectively connected with an inlet end of the primary gravity separator (T1), the first gravity separator (T1) can separate the first oil-gas mixed liquor and the first water-rich mixture into second oil-gas mixed liquor and second water-rich mixture, the sewage outlet of the primary gravity separator (T1) is connected with an inlet end of the secondary cyclone separator (CB), the secondary cyclone separator (CB) can separate the second water-rich mixture into oil-rich mixture and third water-rich mixture, the oil-gas outlet and the sewage outlet of the secondary cyclone separator (CB) are respectively connected with an inlet end of the secondary gravity separator (T2), the second-stage gravity separator (T2) can separate the oil-rich mixture and the third water-rich mixture into a third oil-gas mixed liquid and water, oil-gas outlets of the first-stage gravity separator (T1) and the second-stage gravity separator (T2) are connected with the oil-gas storage mechanism (2) to collect the second oil-gas mixed liquid and the third oil-gas mixed liquid, and a water outlet of the second-stage gravity separator (T2) is connected with the water storage mechanism (3).
2. A wellhead oil-gas-water separation device as claimed in claim 1, which is characterized in that: the separation device of well head oil gas water still includes coalescence mechanism (CP), coalescence mechanism (CP) set up in between delivery port, the water storage mechanism (3) of second grade gravity separator (T2), coalescence mechanism (CP) can with the separation of second grade gravity separator (T2) water carries out profit fine separation.
3. A wellhead oil-gas-water separation device as claimed in claim 1 or 2, wherein: the primary cyclone separator (CA) and the secondary cyclone separator (CB) are respectively and independently selected from one of a side inlet cyclone and a bottom inlet spiral guide type cyclone.
4. A wellhead oil-gas-water separation device as claimed in claim 1 or 2, wherein: the primary gravity separator (T1) and the secondary gravity separator (T2) are both provided with two inlet ends;
an oil-gas outlet of the primary cyclone separator (CA) is connected with one inlet end of the primary gravity separator (T1), and a sewage outlet of the primary cyclone separator (CA) is connected with the other inlet end of the primary gravity separator (T1);
an oil-gas outlet of the secondary cyclone separator (CB) is connected with one inlet end of the secondary gravity separator (T2), and a sewage outlet of the secondary cyclone separator (CB) is connected with the other inlet end of the secondary gravity separator (T2).
5. A wellhead oil-gas-water separation device as claimed in claim 1 or 2, wherein: the first-stage gravity separator (T1) and the second-stage gravity separator (T2) respectively comprise a multi-layer horizontal pipeline and a multi-stage vertical pipeline (6), and the vertical pipeline (6) is communicated with the horizontal pipeline; wherein, one of topmost horizontal pipeline (5) is served and one of bottommost horizontal pipeline (7) is served and is provided with the entry end respectively, be provided with oil gas export A (9) on topmost horizontal pipeline (5) the other end, be provided with delivery port A (8) on bottommost horizontal pipeline (7).
6. A wellhead oil-gas-water separation device as claimed in claim 5, wherein: and a drain outlet (10) is also arranged on the bottommost layer horizontal pipeline (7), and the drain outlet (10) is connected with a drain connecting pipeline (4).
7. A wellhead oil-gas-water separation device as claimed in claim 2, which is characterized in that: the coalescing mechanism is provided with a porous media material.
8. Use of the wellhead oil-gas-water separation device as claimed in any one of claims 1 to 7 in wellhead oil-gas-water separation, oil-water pre-separation of crude oil produced fluid and fine oil-water separation of crude oil produced fluid post-treatment.
9. A separation method of wellhead oil gas water is characterized by comprising the following steps:
the method comprises the following steps: outputting single-well produced liquid from a well mouth, and then carrying out primary cyclone gas-liquid separation to obtain a first oil-gas mixed liquid and a first water-rich mixture;
step two: performing primary gravity oil-water separation on the first oil-gas mixed solution and the first water-rich mixture to obtain a second oil-gas mixed solution and a second water-rich mixture, and collecting the second oil-gas mixed solution;
step three: performing secondary cyclone oil-water separation on the second water-rich mixture to obtain an oil-rich mixture and a third water-rich mixture;
step four: and performing secondary gravity oil-water separation on the oil-rich mixture and the third water-rich mixture to obtain a third oil-gas mixed solution and water, and respectively collecting the third oil-gas mixed solution and the water.
10. A wellhead oil, gas and water separation method as claimed in claim 9, wherein after step four, the separation method further comprises subjecting the water to a coalescence treatment to finely separate the water; the coalescence treatment treats the water through a porous media material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114146454A (en) * | 2020-09-07 | 2022-03-08 | 中国石油化工股份有限公司 | Online rapid oil-water separation vortex pipeline separation device and separation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114146454A (en) * | 2020-09-07 | 2022-03-08 | 中国石油化工股份有限公司 | Online rapid oil-water separation vortex pipeline separation device and separation method |
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