CN115788396B - Downhole oil-water cyclone separation assembly and device and method using same - Google Patents
Downhole oil-water cyclone separation assembly and device and method using sameInfo
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Abstract
一种井下油水旋流分离组件及应用其的装置、方法。其特征在于：所述分离组件包括一级旋流分离模块、二级旋流拓展模块以及微旋流精细分离模块；所述旋流分离模块用于油水混合液的初步分离；所述旋流拓展模块用于分离高进液量时旋流分离模块未分离的油水混合液；所述微旋流精细分离模块用于旋流分离模块和旋流拓展模块初步分离后水相中含有的小粒径油滴完全分离出来；应用所述组件的分离装置采用串并联分离合用的方式，在加大处理量的同时又能把细小油滴分离出来，从而提高处理精度，保证了旋流器进液的稳定性，还能够在有限的空间内实现油相的举升和水相的回注，能够应用于油田现场同井注采工艺高处理量下的各种工况。
A downhole oil-water cyclone separation component and an apparatus and method for using the same. The characteristics are as follows: the separation component includes a primary cyclone separation module, a secondary cyclone expansion module, and a micro-cyclone fine separation module; the cyclone separation module is used for preliminary separation of oil-water mixtures; the cyclone expansion module is used for separating oil-water mixtures that have not been separated by the cyclone separation module when the liquid inflow is high; the micro-cyclone fine separation module is used for completely separating small-particle oil droplets contained in the water phase after preliminary separation by the cyclone separation module and the cyclone expansion module; the separation device using the component adopts a series-parallel separation method, which can increase the processing capacity while separating fine oil droplets, thereby improving the processing accuracy, ensuring the stability of the cyclone liquid inflow, and realizing the lifting of the oil phase and the reinjection of the water phase in a limited space. It can be applied to various working conditions under high processing capacity of the same-well injection and production process in the oil field.
Description
Technical Field
The disclosure relates to the field of downhole same-well injection and production, in particular to an underground oil-water cyclone separation device applied to an oilfield under a high-water-content working condition.
Background
At present, the dominant oil fields in China, such as Daqing oil fields, victory oil fields and the like, enter the middle and later stages of oil field development, most of oil fields adopt a water injection oil displacement mode for exploitation, so that the water injection cost is high, most of water is exploited along with oil during exploitation, the oil exploitation cost is high, and the economic benefit of the oil fields is greatly reduced. Aiming at the condition of high liquid inlet amount under an oilfield well, the prior art mostly adopts parallel-connected same-stage cyclone separators to improve the liquid inlet amount, for example, a horizontal shaft multi-stage oil-water separation device and a same well injection and production device are adopted in China, and a horizontal multi-stage oil-water separation device is disclosed in the patent number CN202011286616.1, and the underground oil-water separation is carried out in a multi-stage parallel connection mode. The publication shows that the multistage parallel connection method adopted greatly improves the treatment capacity, but the parallel rotational flow structure has lower separation precision, especially has poorer treatment capacity on tiny oil drops, and can not increase the treatment capacity and ensure the treatment precision.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the specification provides a specific technical scheme of an underground oil-water cyclone separation assembly, a device and a method using the same, and provides a plurality of specific embodiments, and the underground oil-water cyclone separation device provided by the specific embodiments can separate small oil drops while increasing the treatment capacity, so that the treatment precision is improved. In addition, the device can be connected with more secondary rotational flow expansion modules in series according to the liquid inlet amount of the actual working condition. In addition, the inverted cone structure of the secondary cyclone fixer in the secondary cyclone expansion module can uniformly split the oil-water mixed liquid into four secondary cyclones, and various innovative designs are adopted, so that the treatment accuracy is ensured while the treatment capacity is considered.
One or more embodiments of the present description are implemented according to the following schemes:
first embodiment:
an underground oil-water cyclone separation assembly comprises a primary cyclone separation module, and is characterized in that:
The primary cyclone separation module 1 is provided with a cross flow channel 101, a primary connecting ring 102, a primary annular channel 103, a primary central tube 104, a primary spiral flow passage fixer 105, a primary cyclone fixer 106, a primary spiral flow passage 107, a primary cyclone 108, a primary central pipeline 109 and a primary underflow collector (110).
The cross flow channel 101 is cylindrical, includes a main overflow port 1011 and an oil-water inlet 1012, and has a snap ring 1013.
One end of the primary annular channel 103 is provided with an overflow through hole 1031 and a primary central pipe connecting port 1032, and the interior of the primary annular channel 103 is provided with a primary overflow cavity 1033 and a primary cyclone separation unit mounting pipe 1034.
The primary spiral flow passage fixer 105 is internally provided with a plurality of primary spiral flow passage fixing holes 1051 with screw threads in the circumferential direction and a primary central tube first connecting hole 1052 with screw threads at the center of a circle, and the primary cyclone fixer 106 is provided with a plurality of primary cyclone fixing holes 1061 with screw threads in the circumferential direction and a primary central tube second connecting hole 1062 at the center of a circle.
An overflow channel 1071 is arranged in the primary spiral flow passage 107, a swirl chamber 1081 is arranged in the primary cyclone 108, and an oil-water channel 1091 is arranged in the primary central pipeline 109.
The primary underflow collector 110 is internally provided with a plurality of annular primary underflow opening fixing holes 1101 and a primary central pipeline fixing hole 1102 at the center of a circle, and a primary overflow channel 1103 is arranged outside.
The cross flow channel 101 is nested with a limiting ring 1021 on the primary connecting ring 102 through an internal clamping ring 1013, the primary connecting ring 102 is connected with a lower primary annular channel 103 through threads, a primary central pipe 104 is connected with the primary annular channel 103 and a primary spiral flow channel fixing device 105 through peripheral threads, the upper part of the primary spiral flow channel 107 is connected with a primary spiral flow channel fixing hole 1051 on the primary spiral flow channel fixing device 105 through threads, the lower part of the primary spiral flow channel is embedded into the cyclone through matching with a primary cyclone 108 hole, the primary cyclone 108 and the primary central pipe 109 are connected with a primary cyclone fixing hole 1061 and a primary central pipe second connecting hole 1062 through threads, and the primary annular channel 103 and the primary underflow collector 110 are connected together through threads.
The primary overflow chamber 1033 communicates with the main overflow port 1011.
The oil-water mixture in the first-stage cyclone separation module flows according to the following paths:
From the oil-water inlet 1012, the oil enters the primary central pipe 104 and is divided into two flow paths, wherein the first flow path enters the cyclone chamber 1081 for primary cyclone separation, the separated oil enters the primary overflow chamber 1033 through the overflow channel 1071, and the second flow path enters the primary central pipe 109.
The downhole oil-water cyclone separation assembly is characterized in that a technical optimization means is added on the basis of the first embodiment, so that a second embodiment is obtained:
The assembly further comprises at least one secondary swirl expansion module 2.
The secondary rotational flow expansion module 2 is provided with a secondary annular channel 201, a secondary central tube 202, a secondary spiral flow passage fixer 203, a secondary rotational flow device fixer 204, a secondary spiral flow passage 205, a secondary rotational flow device 206 and a secondary underflow collector 207.
The secondary annular channel 201 is provided with a secondary overflow cavity 2011, a secondary central pipe threaded connection hole 2012, a secondary underflow cavity 2013 and a secondary cyclone separation unit mounting pipe 2014.
The secondary central tube 202 is of a hollow tubular structure with threads on the outside, and a plurality of secondary spiral flow passage fixing holes with threads on the circumferential direction and secondary central tube connecting holes with threads on the circle center are formed in the secondary spiral flow passage fixing device 203.
The secondary cyclone fixer 204 is provided with a plurality of secondary cyclone fixing holes 2041 with threads in the circumferential direction and a reverse cone 2042 at the center of the circle.
An overflow channel 2051 is arranged in the secondary spiral flow channel 205, a secondary cyclone cavity 2061 is arranged in the secondary cyclone 206, and a plurality of annular secondary underflow opening fixing holes 2071, a secondary overflow channel 2072 and a secondary underflow channel 2073 are arranged in the secondary underflow collector 207.
The secondary annular channel 201 is connected with the primary underflow collector 110 through threads, the secondary central tube 202 connects the secondary annular channel 201 with the secondary spiral flow channel fixing device 203 through peripheral threads, the secondary cyclone fixing device 204 is connected with the secondary annular channel 201 through external threads, the secondary spiral flow channel 205 is connected with the secondary spiral flow channel fixing device 203 through threads, the secondary cyclone 206 is connected with the secondary cyclone fixing device 204 through external threads at the top end, the secondary underflow collector 207 connects the secondary annular channel 201 and the micro-cyclone annular channel 301 through internal threads, the secondary underflow channel 2073 is communicated with the secondary underflow cavity 2013, and the secondary overflow channel 2072 is communicated with the secondary overflow cavity 2011.
The primary cyclone separation module and the secondary cyclone expansion module are connected together through threads on the primary underflow collector 110, after the connection, the primary central pipeline 109 is communicated with the secondary central pipeline connection port 2021, the secondary overflow cavity 2011, the primary overflow cavity 1033 and the main overflow port 1011 are mutually communicated, and the main overflow port 1011 is used for discharging the final oil phase.
The oil-water mixture entering the secondary rotational flow expansion module flows according to the following paths:
After entering through the primary central pipeline 109 and the secondary central pipeline connection port 2021, the oil phase enters the secondary cyclone 206 for secondary cyclone separation, the separated oil phase enters the secondary overflow cavity 2011 through the secondary overflow channel 2072, and the water phase enters the secondary underflow channel 2073.
More secondary rotational flow expansion modules can be connected in series according to the liquid inlet amount of the actual working condition.
The downhole oil-water cyclone separation assembly is added with a technical optimization means on the basis of the second embodiment to obtain a third embodiment:
the assembly further comprises a micro cyclone fine separation module 3.
The micro cyclone fine separation module comprises a micro cyclone annular channel 301, a micro cyclone holder 302, a micro cyclone 303, a three-stage connecting ring 304 and an underflow tray 305.
The micro cyclone annular channel 301 is internally provided with a three-stage overflow channel 3011 and a three-stage underflow channel 3012.
The micro cyclone fixer 302 is arranged into a disc structure with an upper layer and a lower layer, the lower layer is provided with a plurality of threaded micro cyclone fixing holes 3021, the upper layer is provided with a plurality of overflow pipe fixing holes 3022, and the middle is provided with a three-stage underflow cavity 3023.
The micro cyclone 303 is internally provided with a micro cyclone overflow pipe 3031, a micro cyclone liquid inlet 3032 and a micro cyclone bottom flow port 3033.
The tertiary connecting ring 304 is identical in construction to the primary connecting ring 102.
The underflow plate 305 is internally constructed with a micro cyclone underflow port fixture hole 3051 and a total underflow port 3052.
The micro cyclone ring channel 301 is connected with the secondary underflow collector 207 through external threads, the micro cyclone holder 302 is connected with the micro cyclone 303 through threads on the micro cyclone fixing holes 3021 and the overflow pipe fixing holes 3022, the micro cyclone holder 302 is connected with the internal threads of the micro cyclone ring channel 301 through peripheral external threads, and the underflow tray 305 is connected with the micro cyclone ring channel 301 through threads on a three-stage connecting ring 304.
The secondary rotational flow expansion module and the micro rotational flow fine separation module are connected together through threads on the secondary bottom flow collector 207, after the connection, the secondary bottom flow cavity 2013 is communicated with the secondary bottom flow channel 2073, the secondary bottom flow channel 2073 is communicated with the tertiary bottom flow channel 3012, and the secondary overflow cavity 2011 is communicated with the secondary overflow channel 2072.
The oil-water mixture entering the micro-cyclone fine separation module flows according to the following paths:
the oil-water mixture reaching the micro-cyclone fine separation module is separated by secondary cyclone, the separated oil phase enters a secondary overflow channel 2072, and the separated water phase finally reaches a total bottom flow port 3052 to be discharged.
Any one of the downhole oil-water cyclone separation assemblies described in the first to third embodiments is selected according to the actual working condition, and then corresponding auxiliary components are configured, so that a new downhole oil-water cyclone separation device can be formed. After the downhole oil-water cyclone separation device is connected to the downhole process pipe column for injection and production in the same well, the separated water phase is injected into the water phase reinjection port of the process pipe column, and the separated oil phase is injected into the oil phase lifting channel of the process pipe column.
The foregoing embodiment shows a specific application of a new downhole oil-water cyclone separation method, where the method is summarized as follows:
sequentially connecting a primary cyclone separation module, a plurality of secondary cyclone expansion modules connected in series and a micro cyclone fine separation module on a same-well injection-production underground process pipe column;
The primary cyclone separation module is used for primarily separating the oil-water mixed liquid;
The cyclone expansion module is positioned at the lower end of the primary cyclone separation module and is used for treating oil-water mixed liquid which is not separated in time by the primary cyclone separation module when the liquid inlet amount is high;
the micro-cyclone fine separation module is used for carrying out secondary separation on the water phase obtained after primary separation of the cyclone separation module and the cyclone expansion module, and completely separating out small-particle-diameter oil drops contained in the water phase after primary separation
The above-mentioned at least one technical solution adopted by one or more embodiments of the present disclosure can achieve the following beneficial effects:
Firstly, the whole structure of the device adopts a mode of serial-parallel connection of multistage rotational flow modules, improves the processing capacity of the device, enhances the oil-water separation precision of the device, saves the exploitation cost of petroleum and improves the applicability. The device is simple to connect, and more secondary rotational flow expansion modules can be connected in series when the device faces the ultrahigh liquid inlet amount, so that various working conditions of an oilfield site can be met.
Secondly, the inverted cone structure of the secondary cyclone fixer in the secondary cyclone expansion module can uniformly split the oil-water mixed liquid into four secondary cyclones, and can improve the separation efficiency and the separation precision.
And thirdly, the adopted overflow runner and the adopted underflow runner can realize the transportation of the separated oil and water to the total overflow port and the total underflow port in a narrow space in the shaft, and finally realize the same injection and production well.
In addition, the adopted micro-cyclone fine separation module can carry out secondary separation on the water phase separated by the primary cyclone separation module and the secondary cyclone expansion module, so that the oil concentration of reinjection water is reduced, and the recovery efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present description, the drawings that are required to be used in the embodiments will be briefly described below, in which the drawings are only some of the embodiments described in the present description, and other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a cross-sectional view of a downhole cyclonic separating apparatus.
FIG. 2 is an overall exploded view of a downhole cyclonic separating apparatus.
Fig. 3 is an exploded view of a primary cyclonic separating module.
Fig. 4 is a cross-sectional view of a cross-flow channel.
Fig. 5 is an external view of the primary annular channel.
FIG. 6 is a cross-sectional view of a primary annular channel.
FIG. 7 is a cross-sectional view of a primary helical flow passage retainer.
Fig. 8 is an external view of the primary cyclone holder.
Fig. 9 is a cross-sectional view of a primary spiral flow path.
Fig. 10 is an external view of the primary cyclone.
Fig. 11 is an external view of the primary central duct.
Fig. 12 is a cross-sectional view of a primary underflow collector.
FIG. 13 is an enlarged view of a portion of a flow channel of a primary cyclone module.
FIG. 14 is an exploded view of a two-stage swirl expansion module.
Fig. 15 is a cross-sectional view of a secondary annular channel.
Fig. 16 is an external view of the two-stage cyclone holder.
Fig. 17 is a cross-sectional view of a secondary underflow collector.
FIG. 18 is an enlarged view of a portion of the overflow channel of the two-stage swirl expansion module.
Fig. 19 is a partial enlarged view of the underflow channel of the secondary cyclone expansion module.
Fig. 20 is an exploded view of a micro cyclone fine separation module.
FIG. 21 is a cross-sectional view of a micro-cyclone annular channel.
Fig. 22 is a cross-sectional view of a micro-cyclone holder.
Fig. 23 is an external view of the micro cyclone.
FIG. 24 is a cross-sectional and partial enlarged view of a micro cyclone.
Fig. 25 is a cross-sectional view of an underflow tray.
In the figure, a 1-stage cyclone separation module, a 101-cross flow channel, a 1011-general overflow port, a 1012-oil-water inlet, a 1013-snap ring, a 102-stage connecting ring, a 1021-limiting ring, a 103-stage annular channel, a 1031-overflow through hole, a 1032-stage central pipe connecting port, a 1033-stage overflow cavity, a 1034-stage cyclone separation unit mounting pipe, a 104-stage central pipe, a 1041-liquid inlet, a 105-stage spiral flow channel fixer, a 1051-stage spiral flow channel fixing hole, a 1052-stage central pipe first connecting hole, a 106-stage cyclone fixer, a 1061-stage cyclone fixing hole, a 1062-stage central pipe second connecting hole, a 107-stage spiral flow channel, a 1071-overflow channel, a 108-stage cyclone, a 1081-cyclone cavity, a 109-stage central pipe, a 1091-oil-water channel, a 110-stage underflow collector, a 1101-stage underflow port fixing hole, a 1102-stage central pipe fixing hole and a 1103-stage overflow channel are shown; the 2-secondary cyclone expansion module, 201-secondary annular channel, 2011-secondary overflow cavity, 2012-secondary central tube threaded connection hole, 2013-secondary underflow cavity, 2014-secondary cyclone separation unit installation tube, 202-secondary central tube, 2021-secondary central tube connection hole, 203-secondary spiral flow passage fixer, 204-secondary cyclone fixer, 2041-secondary cyclone fixing hole, 2042-back taper, 205-secondary spiral flow passage, 206-secondary cyclone, 2061-secondary cyclone cavity, 2062-back taper, 207-secondary underflow collector, 2071-secondary underflow opening fixing hole, 2072-secondary overflow channel, 2073-secondary underflow channel, 3-micro-cyclone fine separation module, 301-micro-cyclone annular channel, 3011-tertiary overflow channel, 302-micro-cyclone fixer, 3021-micro-cyclone fixing hole, 3022-overflow pipe fixing hole, 3023-tertiary underflow cavity, 303-micro-cyclone, 3031-micro-cyclone overflow pipe, 3032-micro-cyclone liquid inlet, 3033-micro-cyclone underflow opening, 304-tertiary connecting ring, 305-underflow plate, 3051-micro-cyclone underflow opening fixing hole, 3052-total underflow opening.
Detailed Description
The technical scheme provided by the disclosure is further described below with reference to the accompanying drawings:
The whole cross-sectional view of the downhole oil-water cyclone separation device is shown in fig. 1, the oil-water mixture with high water content enters the device from an oil-water inlet 1012 to perform cyclone separation, the separated water phase is discharged from a lower total bottom flow port 3052, and the separated oil phase is lifted to the ground from an upper total overflow port 1011.
The explosion view of the underground oil-water cyclone separation device is shown in fig. 2, and the device mainly comprises a primary cyclone separation module 1, a secondary cyclone expansion module 2 and a micro cyclone fine separation module 3.
Fig. 3 is an exploded view of a primary cyclone separation module 1, which mainly comprises a cross flow channel 101, a primary connecting ring 102, a primary annular channel 103, a primary central tube 104, a primary spiral flow channel holder 105, a primary cyclone holder 106, a primary spiral flow channel 107, a primary cyclone 108, a primary central tube 109, and a primary underflow collector 110.
The cross-sectional view of the cross-flow channel 101 is shown in fig. 4, the oil-water mixture with high water content enters the device through the oil-water inlet 1012, the separated oil phase lifts from the main overflow port 1011 to the ground, and the cross-flow channel is matched with the clamping ring 1013 through the limiting ring 1021 on the primary connecting ring 102 so as to achieve the purpose of being connected with the primary annular channel 103.
The primary annular channel is shown in the external view of fig. 5, and the rotational force is converted into the axial force by the internal thread structure and is applied to the limiting ring 1021 and the clamping ring 1013, so that the cross flow channel 101 and the primary annular channel 103 are connected and fixed.
As shown in fig. 6, the cross-sectional view of the primary annular channel 103 is that the oil phases separated by the primary cyclone separation module 1, the secondary cyclone expansion module 2 and the micro cyclone fine separation module 3 are converged to the overflow cavity 1033 and then flow through the overflow through hole 1031 and the total overflow port 1011 to flow out of the device, and the primary cyclone separation unit is installed inside the primary cyclone separation unit installation tube 1034.
The appearance and the sectional view of the primary spiral flow passage fixer 105 are as shown in fig. 7, and 4 primary spiral flow passage fixing holes 1051 are uniformly distributed in the circumferential direction in the interior of the primary spiral flow passage fixer for fixing four primary spiral flow passages 107, and the primary central tube 104 can be connected to the primary central tube first connecting hole 1052 at the center of the circle through threads.
As shown in fig. 8, the outer view of the primary cyclone holder 106 is that 4 primary cyclone fixing holes 1061 are uniformly distributed in the circumferential direction inside the primary cyclone holder, for fixing four primary cyclones 108, and the primary central tube 104 may be connected to the primary central tube second connecting hole 1062 at the center of the circle by threads.
Fig. 9 is a cross-sectional view of the primary spiral flow channel 107 threadably connected to the spiral flow channel holder 105, with separated oil phase entering the primary overflow chamber 1033 through the internal overflow channel 1071.
The external view of the primary cyclone 108 is shown in fig. 10, and the oil-water mixture enters the internal cyclone chamber 1081 through the spiral flow channel for cyclone separation.
The primary central tube 109 is shown in external view in FIG. 11 and is threaded at its upper end to a primary cyclone holder.
The cross-sectional view of the primary underflow collector 110 is shown in fig. 12, in which 4 primary underflow opening fixing holes 1101 are uniformly distributed in the circumferential direction in order to fix four primary cyclones 108, and a primary central pipe fixing hole 1102 is formed at the center of the circle.
As shown in fig. 13, the flow path of the primary cyclone separation module 1 is partially enlarged, and first, the high-water-content oil-water mixture enters the oil-water inlet 1012 and then enters the primary cyclone 108 and the primary central pipe 109 through the primary central pipe 104. The oil-water mixture entering the primary cyclone 108 is separated by cyclone, the oil phase rises from the overflow channel 1071 into the primary overflow chamber 1033 and then is discharged out of the device through the main overflow port 1011, and the water phase is lowered into the secondary underflow chamber 2013 through the cyclone chamber 1081, which is the primary cyclone separation process. The oil-water mixture entering the primary central pipeline 109 can directly reach the secondary rotational flow expansion module 2.
As shown in fig. 14, the exploded view of the secondary cyclone expansion module 2 shows that the secondary cyclone expansion module 2 comprises a secondary annular channel 201, a secondary central tube 202, a secondary spiral flow passage fixer 203, a secondary cyclone fixer 204, a secondary spiral flow passage 205, a secondary cyclone 206 and a secondary underflow collector 207.
A cross-sectional view of the secondary annular channel 201 is shown in fig. 15, which is connected by external threads to the primary underflow collector 110 and the secondary underflow collector 207. The oil phase separated by the micro cyclone fine separation module 3 and the secondary cyclone expansion module 2 is lifted to 2011 to be merged with the oil phase in the primary overflow cavity 1033. The water phase separated by the primary cyclone separation module 1 enters the micro cyclone fine separation module 3 through the secondary underflow cavity 2013, and four secondary cyclones 206 are uniformly distributed in the secondary cyclone separation unit installation pipe 2014.
As shown in fig. 16, the outer view and the cross-sectional view of the secondary cyclone holder 204 are that 4 secondary cyclone fixing holes 2041 are uniformly distributed in the circumferential direction inside the secondary cyclone holder to fix four secondary cyclones 206, and the mixed liquid passing through the secondary central tube 202 passes through the back taper 2042 at the center of the circle and is uniformly split into the secondary cyclones 206.
As shown in fig. 17, the external view and the cross-sectional view of the secondary underflow collector 207 are shown, 4 secondary underflow opening fixing holes 2071 are uniformly distributed in the circumferential direction in the interior of the secondary underflow collector and are used for fixing four secondary cyclones 206, the water phase separated by the secondary cyclone expansion module 2 enters the micro cyclone 303 through a secondary overflow channel 2072, and the oil phase separated by the micro cyclone fine separation module 3 enters the secondary overflow cavity 2011 through a secondary underflow channel 2073.
As shown in fig. 18, the partial enlarged view of the overflow flow passage of the secondary rotational flow expansion module 2 is that the oil-water mixture from the primary central pipe 109 enters the secondary rotational flow device 206 through the secondary central pipe connection port 2021 for rotational flow separation, the separated oil phase enters the secondary overflow cavity 2011 through the overflow passage 2051, then is converged with the oil phase in the primary overflow cavity 1033, finally is discharged from the total overflow 1011, and the separated water phase is lowered into the secondary underflow cavity 2013 through the secondary rotational flow cavity 2061, wherein the above is the secondary rotational flow separation process.
As shown in fig. 19, the partial enlarged view of the underflow channel of the secondary cyclone expansion module is shown, the water phase separated by the primary cyclone separation module 1 passes through the secondary underflow cavity 2013 to reach the secondary underflow channel 2073, and then passes through the tertiary underflow channel 3012 to enter the tertiary underflow cavity 3023. Finally, the water phase separated by the primary cyclone separation module 1 and the secondary cyclone expansion module 2 enters the tertiary micro cyclone 303 for tertiary cyclone separation, the separated oil phase is lifted into the secondary overflow channel 2072, and then reaches the total overflow port 1011 through the secondary overflow cavity 2011 and the primary overflow cavity 1033 to be lifted to the ground. The separated aqueous phase exits the apparatus downwardly through the total bottom flow port 3052.
The micro cyclone fine separation module 3 is shown in an exploded view in fig. 20 and comprises a micro cyclone annular channel 301, a micro cyclone holder 302, a micro cyclone 303, a three-stage connecting ring 304 and an underflow tray 305.
A cross-sectional view of the micro-cyclone annular channel 301 is shown in FIG. 21, which connects the micro-cyclone holder 302 with an external tertiary connecting ring 304 via internal and external threads. As shown in fig. 22, the external appearance and the cross-sectional view of the micro cyclone holder 302 are that the micro cyclone 303 is connected with the micro cyclone holder hole 3021 through an external thread in the middle, the micro cyclone overflow pipe 3031 is directly inserted into the overflow pipe holder hole 3022, and the overflow pipe holder hole 3022 is a stepped through hole with fixing, limiting and liquid guiding functions.
The external view of the micro cyclone 303 is shown in fig. 23, and the middle screw is used to connect with the micro cyclone holder 302. The sectional and partial enlarged view of the micro cyclone 303 is shown in fig. 24, the water phase separated by the first-stage cyclone separation module 1 and the second-stage cyclone expansion module 2 enters the micro cyclone 303 from the micro cyclone liquid inlet 3032 to perform secondary cyclone, the separated oil phase and the oil phases in the second-stage overflow cavity 2011 and the first-stage overflow cavity 1033 are converged to the total overflow port 1011 and discharged out of the device, and the separated water phase is discharged from the underflow disc 305 through the micro cyclone underflow port 3033.
The cross-sectional view of the underflow tray 305 is shown in fig. 25, and the water phase separated by the primary cyclone separation module 1, the secondary cyclone expansion module 2 and the micro cyclone fine separation module 3 finally enters the underflow tray 305 through the micro cyclone underflow opening fixing hole 3051, is converged to the total underflow opening 3052 and is discharged out of the device.
After the device is connected into an oil field same-well injection and production process pipe column, the oil-water mixed liquid enters a primary cyclone separation module and a secondary cyclone expansion module to carry out preliminary oil-water separation. The separated water phase enters a micro-cyclone fine separation module through a designed underflow collector and an annular channel for secondary separation, the separated oil phase is converged to a total overflow port through a flow channel and lifted to the ground, and the separated water is finally converged to the total underflow port and is reinjected to the ground.
The scheme provided by the specification utilizes the principle that the parallel cyclone improves the treatment capacity and the serial cyclone improves the separation precision, the oil-water mixed liquid with high water content is split for multiple times, the oil-water separation precision of the device is enhanced while the treatment capacity is improved, meanwhile, the flow channel which is arranged in the device in a flowing way is innovatively designed, so that the stability of the inlet liquid of the cyclone is ensured, the lifting of an oil phase and the reinjection of an aqueous phase are realized in a limited space, the separation precision is ensured while the high treatment capacity is ensured, and the applicability of the hydrocyclone in the same-well injection and production process is enhanced.
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| CN117065398B (en) * | 2023-08-26 | 2025-07-01 | 东北石油大学 | Multi-stage rotational flow purification device for underground oil and water of same well injection and production |
| CN119549300B (en) * | 2025-01-26 | 2025-03-28 | 东北石油大学三亚海洋油气研究院 | Applicable to multi-stage parallel device of downhole cyclone separator for injection and production in the same well of offshore oil field |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2241419A1 (en) * | 1996-01-12 | 1997-07-17 | Conoco Specialty Products, Inc. | Cyclonic separator assembly and method |
| CN202731870U (en) * | 2012-04-01 | 2013-02-13 | 北京化工大学 | Production-injection device for down-hole oil water separation |
| CN112240193A (en) * | 2020-11-17 | 2021-01-19 | 东北石油大学 | Multistage oil-water separation and same-well injection-production device in horizontal shaft |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6080312A (en) * | 1996-03-11 | 2000-06-27 | Baker Hughes Limited | Downhole cyclonic separator assembly |
| US8261821B2 (en) * | 2009-12-17 | 2012-09-11 | Schlumberger Technology Corporation | Downhole multi-parallel hydrocyclone separator |
| WO2013043354A1 (en) * | 2011-09-21 | 2013-03-28 | Exxonmobil Upstream Research Company | Separating oil and water streams |
| CN107473329B (en) * | 2017-10-12 | 2020-08-14 | 大庆油田有限责任公司 | Underground three-stage cyclone separation device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2241419A1 (en) * | 1996-01-12 | 1997-07-17 | Conoco Specialty Products, Inc. | Cyclonic separator assembly and method |
| CN202731870U (en) * | 2012-04-01 | 2013-02-13 | 北京化工大学 | Production-injection device for down-hole oil water separation |
| CN112240193A (en) * | 2020-11-17 | 2021-01-19 | 东北石油大学 | Multistage oil-water separation and same-well injection-production device in horizontal shaft |
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