A phase redistribution type automatic steady flow three-phase separation device

Abstract

The present invention provides a phase-redistribution type automatic steady-flow three-phase separation device, comprising a three-phase separation module and a high-flow precision separation module; the three-phase separation module comprises a three-phase separation cylinder, a primary separator, a primary spiral flow channel, a tangential inlet sealing disk, a flat-bottom spring and a sliding float; the tangential inlet sealing disk is installed on the top of the three-phase separation cylinder and the primary separator; the high-flow precision separation module comprises a secondary separator, a secondary main screw channel and a secondary separation unit; the flat-bottom spring and the sliding float are located between the primary cover and the water phase outlet; the secondary unit comprises a reducing cylinder, an umbrella-shaped valve, a cross-connecting bridge, a secondary screw channel housing and a secondary secondary screw channel; one end of the reducing cylinder is connected to the secondary through hole, and the other end is connected to the secondary screw channel housing through a cross-connecting bridge; the umbrella-shaped valve is located inside the reducing cylinder. The present invention solves the problem that the existing three-phase separation device cannot maintain steady flow and is difficult to control flow under high liquid inlet conditions.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield produced fluid pretreatment, and in particular to a phase redistribution type automatic steady-flow three-phase separation device. Background Art

[0002] As the production situation in the later stage of oilfield exploitation becomes increasingly complex, the water and sand content of the produced fluid gradually increases, and the difficulty of separation gradually increases. The pretreatment of the produced fluid has become an important part of oilfield exploitation. At present, many well separation devices have problems such as difficult flow control, low separation efficiency and large footprint. In order to improve the separation accuracy of multiphase media on the well and alleviate the impact of changes in the amount of liquid inlet on the separation performance, it is very necessary to propose an efficient three-phase separation device suitable for the well. Patent CN202011424982.9 discloses an integrated sludge wastewater three-phase separation device, and patent CN202220837283.5 discloses an oil sludge water three-phase separation device in sludge cleaning. Although the solutions provided by the above two invention patents can realize the three-phase separation of oil, water and sand, there are still difficulties in flow control, large footprint, low separation accuracy and the need for an external power source to provide power for separation. Therefore, it is very necessary to develop a compact three-phase separation device that can adapt to high liquid inlet, does not require an external power source, and does not reduce the separation accuracy. Summary of the invention

[0003] In view of the above-mentioned technical problems that the existing three-phase separation devices cannot maintain steady flow and are difficult to control flow under high liquid inlet conditions, a phase redistribution type automatic steady flow three-phase separation device is provided, which can adapt to three-phase separation devices with ultra-large liquid inlet ranges, so that it can still run smoothly under normal flow rates or ultra-high liquid inlet rates without affecting the separation efficiency, and automatically stabilize the liquid inlet volume while enhancing the processing capacity, thereby enhancing the applicability of cyclone separation equipment to unstable flow conditions. It has high separation efficiency and simple processing technology, and will be widely recognized and applied in multiphase flow separation fields such as petroleum and environmental protection.

[0004] The technical means adopted by the present invention are as follows:

[0005] The present invention provides a phase redistribution type automatic steady flow three-phase separation device, comprising a three-phase separation module and a high flow precision separation module;

[0006] The three-phase separation module comprises a three-phase separation cylinder, a primary separator, a primary spiral flow channel, a tangential inlet sealing disk, a primary cover, a flat-bottom spring and a sliding float; a water phase separation chamber and a sand phase separation cavity are arranged inside the three-phase separation cylinder; a water phase outlet and a secondary through hole are arranged at the bottom and the lower part of the water phase separation chamber respectively; the primary separator is located inside the three-phase separation cylinder, and the primary spiral flow channel is located inside the primary separator; the tangential inlet sealing disk is installed on the top of the three-phase separation cylinder and the primary separator, and the tangential inlet sealing disk is provided with a tangential outlet, and the interior of the primary separator is connected with the water phase separation chamber through the tangential outlet; the primary cover is installed at the bottom of the primary separator;

[0007] The high-flow precision separation module includes a secondary separator, a secondary main screw channel and a secondary separation unit; the secondary separator is fixedly connected to the three-phase separation cylinder and the top opening is communicated with the water phase outlet, the secondary main screw channel is located inside the secondary separator, the secondary main screw channel includes a main overflow guide pipe and a hollow shaft, and a hole is provided at the lower part of the main overflow guide pipe; the through-axis of the primary spiral flow channel is connected to the hollow shaft; the flat-bottom spring and the sliding float are located between the primary cover and the water phase outlet; the secondary unit includes a reducing cylinder, an umbrella-shaped valve, a cross-connecting bridge, a secondary screw channel housing and a secondary secondary screw channel; one end of the reducing cylinder is connected to the secondary through hole, and the other end is connected to the secondary screw channel housing through the cross-connecting bridge; the umbrella-shaped valve is located inside the reducing cylinder, the sliding rod extends into the connecting bridge axial hole of the cross-connecting bridge, and the sliding rod outer sleeve is provided with a spring; the secondary secondary screw channel is located inside the secondary screw channel housing, and the top is fixedly connected to the connecting bridge axial hole.

[0008] Furthermore, the high-flow fine separation module also includes a water phase collecting pipe and an oil phase collecting pipe; the main overflow conducting pipe and the hollow shaft both pass through the secondary separator and are connected to the oil phase collecting pipe; the secondary separator is connected to the water phase collecting pipe through a main bottom flow conducting pipe arranged at the bottom; the secondary screw housing is connected to the oil phase collecting pipe through a secondary overflow conducting pipe arranged at the bottom, and is connected to the water phase collecting pipe through a secondary bottom flow conducting pipe arranged at the bottom.

[0009] Furthermore, the three-phase separation device also includes a truncated cone tripod, and a supporting ring plate is installed outside the three-phase separation cylinder, and the supporting ring plate is fixedly installed in the annular groove on the top of the truncated cone tripod.

[0010] Furthermore, the water phase outlet of the three-phase separation cylinder is installed with a necked flange, and the top opening of the secondary separator is installed with a flange connector, the two ends of the flange connector are respectively a flange and a stepped disc, the flange is fixedly connected to the necked flange, and the stepped disc is threadedly connected to the top opening of the secondary separator.

[0011] Furthermore, the tangential inlet sealing disk includes an outer stepped shaft shoulder and an inner stepped shaft shoulder, and the outer stepped shaft shoulder and the inner stepped shaft shoulder are respectively connected to the three-phase separation cylinder and the first-stage separator through threads; the tangential inlet sealing disk also includes a top cone, and the top cone is located inside the first-stage separator.

[0012] Furthermore, a sand phase separation plate is installed inside the three-phase separation cylinder, and the sand phase separation cavity is formed between the sand phase separation plate and the three-phase separation cylinder.

[0013] Furthermore, the secondary separator includes an overflow conducting hole and an overflow isolation plate; the hollow shaft is arranged inside the main overflow conducting pipe; the overflow isolation plate is located outside the main overflow conducting pipe, and an annular space area for gathering the oil phase is formed between the overflow isolation plate and the main overflow conducting pipe; the main overflow conducting pipe is installed in the overflow conducting hole, and the main overflow conducting pipe and the hollow shaft pass through the overflow conducting hole to be connected to the oil phase collecting pipe.

[0014] Furthermore, the water phase collecting pipe is an annular collecting pipe, which includes a secondary underflow connecting pipe, an annular channel, a main underflow connecting pipe and an underflow collecting pipe, the secondary underflow conducting pipe is flange-connected to the secondary underflow connecting pipe, the main underflow conducting pipe is flange-connected to the main underflow connecting pipe, and the secondary underflow connecting pipe and the main underflow connecting pipe are connected to the underflow collecting pipe through the annular channel.

[0015] Furthermore, the high-flow separation module also includes an overflow connecting pipe, both ends of which are respectively connected to the auxiliary overflow conducting pipe and the oil phase collecting pipe; the oil phase collecting pipe is a forked collecting pipe, and the forked collecting pipe includes a collecting main pipe and a collecting auxiliary pipe, the main overflow conducting pipe and the hollow shaft are both connected to the forked collecting pipe through the collecting main pipe, and the auxiliary overflow conducting pipe is connected to the collecting auxiliary pipe through the overflow connecting pipe, and then connected to the forked collecting pipe.

[0016] Furthermore, the high-flow fine separation module includes a plurality of the auxiliary separation units, a plurality of the auxiliary through holes are evenly arranged along the circumferential direction at the lower part of the water phase separation chamber, and each of the auxiliary through holes is provided with a corresponding auxiliary separation unit.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The phase redistribution type automatic steady flow three-phase separation device provided by the present invention adopts a vertical structure design, and the working process is from top to bottom, realizing the three-phase separation of oil, water and sand, and at the same time can achieve high flow processing capacity and automatic steady flow function.

[0019] 2. The phase redistribution type automatic steady flow three-phase separation device provided by the present invention has a three-phase separation module on the top. The mixed phase medium enters the module for preliminary pre-separation. In order to increase the cyclone field intensity, a tangential inlet sealing disk is designed at the outlet of the mixed liquid, and the outflow along the tangential velocity direction provides a strong centrifugal force for solid-liquid phase separation.

[0020] 3. The phase redistribution type automatic steady flow three-phase separation device provided by the present invention allows the bottom flow liquid flowing out of the three-phase separation module to enter the high-flow fine separation module for high-precision separation of the oil and water phases. At the same time, a sliding float is provided at the inlet of the high-flow fine separation module to stabilize the flow of the mixed phase entering the secondary separator, thereby avoiding a decrease in separation performance due to unstable flow.

[0021] 4. In the phase redistribution type automatic steady flow three-phase separation device provided by the present invention, the auxiliary through hole in the three-phase separation tube structure design and the hole near the neck flange are both the inlet for the bottom flow liquid outflowing from the three-phase separation module. The two holes cooperate with each other, and the change of the liquid level allows the secondary auxiliary screw channel to work intermittently at irregular intervals to meet the requirements of both stabilizing the flow rate and handling the separation of media with high liquid inlet volume.

[0022] 5. The phase redistribution type automatic steady flow three-phase separation device provided by the present invention has a compact configuration, adopts multiple screw channels in series and in parallel in space, and innovatively adopts annular tube collection in the bottom flow collection method, converting multiple spatial direction outlets into the same outlet, so that the same-direction media all flow out through one outlet, which is suitable for actual on-site applications.

[0023] To sum up, the three-phase separation device described in the present invention integrates the functions of three-phase separation, flow adaptation and ultra-high processing capacity. The spiral flow channel and the tangential outlet accelerate and enhance the cyclone field strength to preferentially separate the sand phase with higher density. The oil phase and the water phase continue to separate after passing through the high-flow fine separation module. When the flow rate is large, the effective flow area of ​​the sliding float and the neck flange is reduced to achieve a steady flow effect. At the same time, part of the surplus liquid phase is discharged through the secondary through hole, so that the operation of the secondary auxiliary machine enhances the high liquid intake processing capacity. The secondary main mechanism and the secondary width mechanism complement each other and reasonably allocate the actual proportion of the required processing flow. The multiple outlets of the same phase are innovatively merged into a single outlet. The compact and reasonable spatial layout greatly enhances the applicability.

[0024] Based on the above reasons, the present invention can be widely promoted in the field of multiphase flow separation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a schematic diagram of the overall structure of the phase redistribution type automatic steady-flow three-phase separation device.

[0027] Figure 2 It is an exploded diagram of the phase redistribution type automatic steady flow three-phase separation device.

[0028] Figure 3 It is a cross-sectional view of the phase redistribution type automatic steady flow three-phase separation device.

[0029] Figure 4 Schematic diagram of the overall structure of the three-phase separation module.

[0030] Figure 5 2 is an exploded diagram of the three-phase separation module.

[0031] Figure 6 It is a cross-sectional view of the three-phase separation module.

[0032] Figure 7 It is a cross-sectional view of the three-phase separation cylinder.

[0033] Figure 8 It is a schematic diagram of the structure of the tangential inlet sealing disk.

[0034] Fig. 9 This is a cross-sectional view of the tangential inlet sealing disk.

[0035] Fig.10 It is a cross-sectional view of the sliding float.

[0036] Fig.11 Schematic diagram of the overall structure of the high-flow precision separation module.

[0037] Fig.12 This is a cross-sectional view of the high-flow precision separation module.

[0038] Fig.13 This is an exploded view of the high-flow precision separation module.

[0039] Fig.14 It is a schematic diagram of the structure of the flange connector.

[0040] Fig.15 It is a schematic diagram of the structure of the secondary separator.

[0041] Fig.16Schematic diagram of the secondary main screw channel structure.

[0042] Fig.17 This is a cross-sectional view after the secondary separator and the secondary main screw channel are assembled.

[0043] Fig.18 It is a cross-sectional view of the umbrella valve.

[0044] Fig.19 Schematic diagram of the cross connection bridge structure.

[0045] Fig. 20 It is a cross-sectional view of the cross connecting bridge.

[0046] Fig.21 It is a schematic diagram of the spatial position of the three-phase separation device under the condition of appropriate liquid inlet volume.

[0047] Fig. 22 It is a schematic diagram of the spatial position change of the three-phase separation device under super flow conditions.

[0048] Fig.23 It is a cross-sectional view of the lower end shell.

[0049] Fig.24 It is a schematic diagram of the secondary auxiliary screw channel structure.

[0050] Fig.25 It is a schematic diagram of the forked collecting tube structure.

[0051] Fig.26 Schematic diagram of the annular collecting pipe structure.

[0052] Fig. 27 It is a schematic diagram of the structure of the truncated table tripod.

[0053] In the figure: 1, three-phase separation module; 2, high flow precision separation module; 3, three-phase separation cylinder; 301, liquid inlet; 302, liquid inlet pipe; 303, sand phase isolation plate; 304, sand phase outlet; 305, neck flange; 306, secondary through hole; 307, support ring plate; 4, primary separator; 5, primary spiral flow channel; 6, tangential inlet sealing disk; 601, tangential outlet; 602, top cone; 60 3. Outer stepped shoulder; 604, inner stepped shoulder; 7, primary cover; 8, flat bottom spring; 9, sliding float; 901, float groove; 10, flange connector; 11, secondary separator; 1101, overflow conduction hole; 1102, overflow isolation plate; 1103, main bottom flow conduction pipe; 12, secondary main screw channel; 1201, main overflow conduction pipe; 1202, flute hole; 1203, hollow shaft; 13, reducer; 14, umbrella valve; 1401, umbrella cap; 1402, sliding rod; 1403, upper limit annular groove; 1404, spring; 15, cross connecting bridge; 1501, connecting bridge axial hole; 1502, lower limit annular groove; 1503, cross beam; 16, upper end shell; 17, lower end shell; 1701, auxiliary overflow guide pipe; 1702, auxiliary underflow guide pipe; 18 , secondary auxiliary screw channel; 19, overflow connecting pipe; 20, annular collecting pipe; 2001, auxiliary underflow connecting pipe; 2002, annular channel; 2003, main underflow connecting pipe; 2004, underflow collecting pipe; 2005, water phase outlet; 21, fork-shaped collecting pipe; 2101, collecting main pipe; 2102, collecting auxiliary pipe; 2103, oil phase outlet; 22, truncated tripod; 2201, annular groove. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] Example 1

[0061] like Figure 1-3 As shown, the present invention provides a phase redistribution type automatic steady flow three-phase separation device, which is in a vertical working state and can finely separate the sand phase, oil phase and water phase of a multiphase medium mixture and collect them separately; it includes a three-phase separation module 1 and a high-flow precision separation module 2 arranged in upper and lower positions;

[0062] like Figures 4 to 7 As shown, the three-phase separation module 1 includes a three-phase separation cylinder 3, a primary separator 4, a primary spiral flow channel 5, a tangential inlet sealing disk 6, a primary cover 7, a flat bottom spring 8 and a sliding float 9;

[0063] The three-phase separation cylinder 3 is provided with a liquid inlet 301, a sand phase outlet 304 and a secondary through hole 306;

[0064] The three-phase separation cylinder 3 is provided with a water phase separation chamber and a sand phase separation cavity; the bottom and lower part of the water phase separation chamber are provided with a water phase outlet and the auxiliary through hole 306 respectively; the sand phase outlet 304 is connected to the sand phase separation cavity;

[0065] The primary separator 4 is located inside the three-phase separation cylinder 3, the primary spiral flow channel 5 is located inside the primary separator 4, and the liquid inlet 301 is connected to the primary separator 4; the tangential inlet sealing disk 6 is installed on the top of the three-phase separation cylinder 3 and the primary separator 4, and the tangential inlet sealing disk 6 is provided with a tangential outlet 601, and the interior of the primary separator 4 is connected to the water phase separation chamber through the tangential outlet 601; the primary cover 7 is installed at the bottom of the primary separator 4;

[0066] The high flow rate separation module 2 is used to finely separate the oil phase and the water phase and reasonably distribute the flow of each channel to avoid excessive liquid inflow resulting in poor separation performance; Figures 11 to 13 As shown, the high flow fine separation module 2 includes a secondary separator 11, a secondary main screw channel 12, a secondary separation unit, a water phase collection pipe and an oil phase collection pipe;

[0067] The secondary separator 11 is fixedly connected to the three-phase separation cylinder 3 and the top opening is communicated with the water phase outlet. The secondary main screw channel 12 is located inside the secondary separator 11. Fig.16 As shown, the secondary main screw channel 12 is provided with a spiral flow channel, and the secondary main screw channel 12 includes a main overflow guide pipe 1201 and a hollow shaft 1203. A flute-shaped hole 1202 is provided at the lower part of the main overflow guide pipe 1201. The main overflow guide pipe 1201 and the hollow shaft 1203 both pass through the secondary separator 11 and are connected to the oil phase collection pipe;

[0068] The through-axis of the primary spiral flow channel 5 passes through the primary cover 7 and the water phase outlet to communicate with the hollow shaft 1203 to form a continuous closed oil phase discharge channel; the flat-bottom spring 8 and the sliding float 9 are located between the primary cover 7 and the water phase outlet, and are sequentially sleeved on the through-axis, one end of the flat-bottom spring 8 is fixedly mounted on the primary cover 7, and the other end is fixedly mounted on the sliding float 9; the sliding float 9 can slide axially along the through-axis; the end of the hollow shaft 1203 connected to the through-axis is provided with a stepped shoulder for limiting the sliding position of the sliding float 9;

[0069] The secondary separator 11 is connected to the water phase collecting pipe through the main underflow conducting pipe 1103 arranged at the lower part;

[0070] The auxiliary unit comprises a reducing cylinder 13, an umbrella-shaped valve 14, a cross connecting bridge 15, an auxiliary screw channel housing and a secondary auxiliary screw channel 18; one end of the reducing cylinder 13 is connected to the auxiliary through hole 306, and the other end is connected to the auxiliary screw channel housing through the cross connecting bridge 15; the umbrella-shaped valve 14 is located inside the reducing cylinder 13, and a sliding rod 1402 extends into the connecting bridge axial hole 1501 of the cross connecting bridge 15, and a spring 1404 is provided on the sliding rod 1402, and its two ends are respectively fixedly installed on the umbrella-shaped valve 14 and the cross bridge 15; the sliding rod 1402 cooperates with the connecting bridge axial hole 1501 so that the umbrella-shaped valve 14 can only move in the axial direction, and the spring 1404 can play a role in supporting the umbrella-shaped valve 14 under the action of reverse elastic force;

[0071] The secondary auxiliary screw channel 18 is located inside the auxiliary screw channel housing, and the top is fixedly connected to the connecting bridge axial hole 1501;

[0072] The auxiliary screw channel housing is connected to the oil phase collecting pipe through the auxiliary overflow conducting pipe 1701 arranged at the bottom, and is connected to the water phase collecting pipe through the auxiliary underflow conducting pipe 1702 arranged at the lower part;

[0073] The three-phase medium mixture enters the device through the liquid inlet 301, and flows through the three-phase separation module 1 to achieve the preliminary separation of the oil phase and the water phase and the separate separation of the sand phase. The separated sand phase is discharged through the sand phase outlet 304, and the water phase separated by the three-phase separation module 1 continues to flow into the high-flow fine separation module 2 to achieve fine oil-water separation of the water-rich phase. The separated oil phase is collected in the oil phase collection pipe and finally discharged through the oil phase outlet 2103, and the separated water phase is collected in the water phase collection pipe and discharged through the water phase outlet 2005.

[0074] Furthermore, if Fig. 27As shown, the three-phase separation device also includes a truncated cone tripod 22, and a supporting ring plate 307 is installed outside the three-phase separation cylinder 3. The supporting ring plate 307 is fixedly installed in the annular groove 2201 on the top of the truncated cone tripod 22. The truncated cone tripod 22 is used to support the three-phase separation cylinder 3 so that the entire device can run smoothly in a vertical state.

[0075] Furthermore, the three-phase separation cylinder 3 further includes a liquid inlet pipe 302 , which cooperates with the liquid inlet hole of the primary separator 4 to achieve axial positioning, and the liquid inlet 301 is connected to the primary separator 4 through the liquid inlet pipe 302 .

[0076] Furthermore, the water phase outlet of the three-phase separation cylinder 3 is installed with a necked flange 305, and the top opening of the secondary separator 11 is installed with a flange connector 10, such as Fig.14 As shown, the two ends of the flange connector 10 are a flange and a stepped disc respectively, the flange is fixedly connected to the necked flange 305 by bolts, and the stepped disc is threadedly connected to the top opening of the secondary separator 11 by a thread set on the side wall; the necked flange 305 and the flange connector 10 are both provided with a cavity inside, and the through shaft is connected to the hollow shaft 2103 in the cavity.

[0077] like Figure 4 As shown, the supporting ring plate 307 is the force-bearing position of the entire device, and cooperates with the annular groove 2201 inside the truncated cone tripod 22 to support the entire device. The necked flange 305 is bolted to the flange connector 10 to connect and fix the three-phase separation module 1 and the high-flow precision separation module 2 to each other.

[0078] Furthermore, if Figure 8 As shown, the tangential inlet sealing disk 6 includes an outer stepped shaft shoulder 603 and an inner stepped shaft shoulder 604, and the outer stepped shaft shoulder 603 and the inner stepped shaft shoulder 604 are respectively connected to the three-phase separation cylinder 3 and the primary separator 4 through threads, and the outer stepped shaft shoulder 603 serves to seal the three-phase separation cylinder 3, and the inner stepped shaft shoulder 604 serves to fix the primary separator 4.

[0079] Furthermore, the tangential inlet sealing disk 6 further includes a top cone 602 , which is located inside the primary separator 4 and is used to accelerate the axial migration of the oil core in the axial region inside the primary separator 4 .

[0080] Furthermore, the tangential inlet sealing disk 6 is evenly provided with five tangential inlets 601 along the circumferential direction.

[0081] Fig. 9It is a cross-sectional view of the tangential inlet sealing disk 6. The water phase separated inside the primary separator 4 is discharged through the tangential outlet 601, and at the same time flows out along the circumferential tangential speed direction to achieve secondary rotation acceleration.

[0082] Furthermore, the primary sealing cover 7 is threadedly connected to the primary separator 4 via a thread provided on the side wall, and the primary sealing cover 7 is connected to the through shaft via a thread provided on the inner wall of the center hole.

[0083] Furthermore, the first-stage separator 4 is a hollow structure, including cylindrical sections with different diameters at both ends and a reducing cone section in the middle. The end face of the small-diameter cylindrical section of the first-stage separator 4 is connected to the tangential inlet sealing disk 6, and the end face of the large-diameter cylindrical section is connected to the first-stage cover 7.

[0084] Furthermore, if Fig.10 As shown, the interior of the sliding float 9 is a hollow cavity to reduce the weight of the sliding float 9, thereby reducing the sliding resistance of the sliding float 9 on the outer wall of the through shaft, and more quickly sensing the water surface pressure to stabilize the flow.

[0085] Furthermore, the primary sealing cover 7 is provided with an annular groove, the sliding float 9 is provided with a float groove 901 , and both ends of the flat bottom spring 8 are respectively welded and fixed to the annular groove 701 and the float groove 901 .

[0086] Furthermore, a sand phase separation plate 303 is installed inside the three-phase separation cylinder 3 , and the sand phase separation cavity is formed between the sand phase separation plate 303 and the three-phase separation cylinder 3 .

[0087] Furthermore, if Fig.15 , 17 As shown, the secondary separator 11 is in the shape of a variable diameter long cylinder, and the secondary separator 11 includes an overflow conducting hole 1101 and an overflow isolation plate 1102; the hollow shaft 1203 is arranged inside the main overflow conducting pipe 1201; the overflow isolation plate 1102 is located outside the main overflow conducting pipe 1201, and an annular space area for gathering the oil phase is formed between the overflow isolation plate 1102 and the main overflow conducting pipe 1201; the main overflow conducting pipe 1201 is installed on the overflow conducting hole 1101 by threads, and the main overflow conducting pipe 1201 and the hollow shaft 1203 pass through the overflow conducting hole 1101 to be connected to the oil phase collecting pipe.

[0088] Furthermore, the small diameter end of the reducer 13 is threadedly connected to the secondary through hole 306 , and the large diameter end is threadedly connected to the cross connecting bridge 15 .

[0089] Furthermore, if Fig.18 , 19As shown, the interior of the umbrella-shaped valve 14 is a hollow cavity, and the bottom surface of the umbrella top cap 1401 of the umbrella-shaped valve 14 is provided with an upper limit annular groove 1403 for installing the spring 1404. The umbrella top cap 1401 can sensitively sense the change of the liquid surface pressure to control the opening and closing degree of the umbrella-shaped valve 14, and the top surface of the cross connecting hole is provided with a lower limit annular groove 1502 for installing the spring 1404. The spring 1404 can realize reciprocating motion by being limited by the upper limit annular groove 1403 and the lower limit annular groove 1502.

[0090] Furthermore, if Fig. 20 As shown, the cross connecting bridge 15 includes an outer ring for connecting to the reducer 13, and a cross beam 1503 for connecting the outer ring and the axial hole 1501 of the connecting bridge. The cross beam 1503 serves to connect and fix the outer ring and the axial hole 1501 of the connecting bridge. At the same time, the liquid can flow out through the gap between the cross beams 1503.

[0091] Furthermore, the cross connecting bridge 15 is threadedly connected and fixed to the reducing cylinder 13 and the auxiliary screw channel housing respectively, and the lower end of the connecting bridge axial hole 1501 is threadedly connected to the secondary auxiliary screw channel 18 .

[0092] Furthermore, the auxiliary screw channel housing includes an upper housing 16 and a lower housing 17, and both ends of the upper housing 16 are respectively threadedly connected to the cross connecting bridge 15 and the lower housing 17, as shown in FIG. Fig.23 As shown, the secondary overflow conduit 1701 and the secondary underflow conduit 1702 are respectively arranged at the bottom and the lower part of the lower end shell 17.

[0093] Furthermore, if Fig.24 As shown, one end of the secondary auxiliary screw channel 18 is cylindrical and is connected to the axial center hole 1501 of the connecting bridge by threads to tighten the secondary auxiliary screw channel 18, and the other end is conical.

[0094] Furthermore, if Fig.26 As shown, the water phase collecting pipe is an annular collecting pipe 20, and the annular collecting pipe 20 includes a secondary underflow connecting pipe 2001, an annular channel 2002, a main underflow connecting pipe 2003 and an underflow collecting pipe 2004, the secondary underflow conducting pipe 1702 is flange-connected to the secondary underflow connecting pipe 2001, the main underflow conducting pipe 1103 is flange-connected to the main underflow connecting pipe 2003, and the secondary underflow connecting pipe 2001 and the main underflow connecting pipe 2003 are connected to the underflow collecting pipe 2004 through the annular channel 2002.

[0095] Furthermore, the high-flow separation module 2 also includes an overflow connecting pipe 19, which is a cylinder with an axial through hole, and both ends of which are respectively provided with stepped shoulders with threads on the inner wall. The two ends of the overflow connecting pipe 19 are respectively connected to the auxiliary overflow conduit 1701 and the oil phase collection pipe through the stepped shoulders.

[0096] Furthermore, if Fig.25 As shown, the oil phase collecting pipe is a forked collecting pipe 21, and the forked collecting pipe 21 includes a collecting main pipe 2101 and a collecting sub-pipe 2102. The main overflow conducting pipe 1201 and the hollow shaft 1203 are both connected to the forked collecting pipe 21 through the collecting main pipe 2101, and the sub-overflow conducting pipe 1701 is connected to the collecting sub-pipe 2102 through the overflow connecting pipe 19, and then connected to the forked collecting pipe 21.

[0097] Furthermore, the high-flow separation module 2 includes a plurality of auxiliary separation units, and a plurality of auxiliary through holes 306 are evenly arranged along the circumference at the lower part of the water phase separation chamber, and each of the auxiliary through holes 306 is provided with a corresponding auxiliary separation unit; the secondary separator 11 and the secondary main screw channel 12 are arranged along the axis of the three-phase separation device, and the auxiliary separation units are evenly distributed along the circumference on the periphery of the secondary separator 11.

[0098] Furthermore, the high-flow fine separation module 2 includes four auxiliary separation units.

[0099] The working process of the phase redistribution type automatic steady flow three-phase separation device of the present invention is as follows:

[0100] The three-phase mixed liquid enters the primary separator 4 through the liquid inlet 301, and forms a strong cyclonic flow field after the spiral acceleration of the primary spiral flow channel 5. The light oil phase with lower density gathers at the axis and is separated through the through-axis of the primary spiral flow channel 5. The wall-attached sand phase and a large amount of water phase are discharged into the water phase separation chamber and the sand phase separation chamber of the three-phase separation cylinder 3 through the tangential inlet sealing disk 6. The fluid flowing through the tangential inlet sealing disk 6 will produce a strong tangential acceleration to strengthen the centripetal force of the separated heterogeneous medium. The sand phase and water phase spiraled out through the tangential inlet sealing disk 6 continue to separate, and the heavy sand phase is coated in the three-phase separation. The inner wall of the three-phase separation cylinder 3 falls into the sand phase separation cavity between the inner wall of the three-phase separation cylinder 3 and the sand phase isolation plate 303, and is finally discharged through the sand phase outlet 304. The remaining water phase falls into the bottom and is discharged through the neck flange 305. If the liquid inlet volume increases sharply, the water phase will also flow out through the secondary through hole 306, so that the neck flange 305 and the secondary through hole 306 discharge water at the same time and flow into the high-flow fine separation module 2 one after another. The flat-bottom spring 8 and the sliding float 9 are used to stabilize the water phase flow through the neck flange 305 to avoid excessive flow causing adverse effects on oil-water separation in the secondary separator 11;

[0101] The water-rich phase separated by the three-phase separation module 1 flows into the secondary separator 11 through the flange connector 10 and generates a strong centrifugal force through the secondary main screw channel 12. A small amount of oil phase approaches the wall of the main overflow conducting pipe 1201 and finally moves to the annular area formed by the lower overflow isolation plate 1102 and the main overflow conducting pipe 1201, enters the main overflow conducting pipe 1201 through the flute hole 1202, merges with the oil phase separated by the three-phase separation module 1, and finally flows into the fork-shaped collecting pipe 21 through the collecting main pipe 2101;

[0102] A large amount of water phase flows out through the main underflow conducting pipe 1103 under the strong cyclonic flow field in the secondary separator 11, passes through the main underflow connecting pipe 2003 and the underflow collecting pipe 2004 in sequence, and finally is discharged through the water phase outlet 2005 of the annular collecting pipe 20;

[0103] If the water phase flow rate increases sharply until the water level in the three-phase separation cylinder 3 reaches the position of the secondary through hole 306, part of the water phase will enter the reducer 13 through the secondary through hole 306 and be separated through the secondary secondary screw channel 18. The separated oil phase passes through the secondary overflow conducting pipe 1701, the overflow connecting pipe 19 and the collecting secondary pipe 2102 in turn to enter the collecting main pipe 2101 and merge with the oil phase separated by the secondary main screw channel 12, and finally be discharged through the oil phase outlet 2103; the separated water phase passes through the secondary bottom flow conducting pipe 1702, the secondary bottom flow connecting pipe 2001, and the annular channel 2002 in turn to enter the bottom flow collecting pipe 2004 and merge with the water phase separated by the secondary main screw channel 12, and finally be discharged through the water phase outlet 2005, thus completing the entire separation process.

[0104] Fig.21 It is a schematic diagram of the spatial position of the three-phase separation device under the condition of appropriate liquid inflow. The overall device is arranged in a centrally symmetrical manner. It can be seen from the figure that under appropriate liquid inflow, the water-rich phase after separation by the three-phase separation module 1 is deposited at the bottom of the three-phase separation cylinder 3 and flows into the high-flow fine separation module 2 through the neck flange 305. Since the liquid inflow is stable, the liquid level height is relatively balanced, and the water-rich phase flows through the secondary separator 11 for fine separation.

[0105] Fig. 22Schematic diagram of the spatial position change of the three-phase separation device under superflow conditions. If the liquid inflow increases sharply, the liquid level gradually increases. When the liquid level reaches a certain height in the three-phase separation cylinder 3, part of the water phase flows into the secondary through hole 306, and the liquid surface pressure directly impacts the umbrella cap 1401. Under the reverse elastic force of the spring 1404, the secondary through hole 306 can be closed by utilizing the special structure of the umbrella cap 1401. If the liquid level in the three-phase separation cylinder 3 continues to rise, the internal pressure of the secondary through hole 306 increases, and the reverse elastic force of the spring 1404 is insufficient to support the hydraulic pressure. At this time, under the impact of the liquid phase pressure, the umbrella valve 14 will move downward, and an annular gap area will be formed between the umbrella valve 14 and the reducer 13. The greater the liquid inflow, the higher the liquid level, the greater the pressure in the secondary through hole 306, resulting in the umbrella valve 14 moving farther downward, and the water phase exits through the secondary separation unit. The greater the flow rate, the less the processing capacity of the secondary separator 11 is indirectly reduced, thereby ensuring the separation efficiency. At the same time, it can be seen that after the high-speed fluid impacts the flat bottom surface of the upper surface, the sliding float 9 can still move downward for a distance under the strong pulling force of the flat bottom spring 8. Since the channel cross-section at the outlet of the necked flange 305 gradually becomes smaller, the farther the sliding float 9 moves downward, the easier it is to block more liquid from entering the secondary separator 11. At the same time, the stepped shoulder arranged on the end face of the hollow shaft 1203 can limit the continuous downward movement of the sliding float 9, that is, when the sliding float 9 moves the farthest distance to contact the stepped shoulder of the hollow shaft 1203, as the inlet liquid volume increases, the liquid phase entering the secondary separator 11 is relatively stable, resulting in the increase of the liquid level in the three-phase separation cylinder 3, which flows out through the secondary through hole 306 to achieve a steady flow process under high flow.

[0106] When the three-phase separation device provided by the present invention is working, it first passes through the three-phase separation module 1 to realize the sand phase separation and the preliminary separation of the oil-water phase of the three-phase mixed liquid, and then passes through the high-flow fine separation module 2 to perform a secondary fine separation on the bottom flow water phase. At the same time, the three-phase separation device provided by the present invention can adapt to the flow rate and has a flow stabilization function, and can adjust the flow rate entering the high-flow fine separation module, thereby avoiding the influence of flow instability on separation efficiency. It is suitable for industrial multiphase medium separation and has high practical value.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A phase redistribution type automatic steady flow three-phase separation device, characterized in that: Including three-phase separation module and high-flow precision separation module; The three-phase separation module comprises a three-phase separation cylinder, a primary separator, a primary spiral flow channel, a tangential inlet sealing disk, a primary cover, a flat-bottom spring and a sliding float; a water phase separation chamber and a sand phase separation cavity are arranged inside the three-phase separation cylinder; a water phase outlet and a secondary through hole are arranged at the bottom and the lower part of the water phase separation chamber respectively; the primary separator is located inside the three-phase separation cylinder, and the primary spiral flow channel is located inside the primary separator; the tangential inlet sealing disk is installed on the top of the three-phase separation cylinder and the primary separator, and the tangential inlet sealing disk is provided with a tangential outlet, and the interior of the primary separator is connected with the water phase separation chamber through the tangential outlet; the primary cover is installed at the bottom of the primary separator; The high-flow precision separation module includes a secondary separator, a secondary main screw channel and a secondary separation unit; the secondary separator is fixedly connected to the three-phase separation cylinder and the top opening is communicated with the water phase outlet, the secondary main screw channel is located inside the secondary separator, the secondary main screw channel includes a main overflow guide pipe and a hollow shaft, and a hole is provided at the lower part of the main overflow guide pipe; the through-axis of the primary spiral flow channel is connected to the hollow shaft; the flat-bottom spring and the sliding float are located between the primary cover and the water phase outlet; the secondary separation unit includes a reducing cylinder, an umbrella-shaped valve, a cross-connecting bridge, a secondary screw channel housing and a secondary secondary screw channel; one end of the reducing cylinder is connected to the secondary through hole, and the other end is connected to the secondary screw channel housing through the cross-connecting bridge; the umbrella-shaped valve is located inside the reducing cylinder, the sliding rod extends into the connecting bridge axial hole of the cross-connecting bridge, and the sliding rod outer sleeve is provided with a spring; the secondary secondary screw channel is located inside the secondary screw channel housing, and the top is fixedly connected to the connecting bridge axial hole.

2. The phase redistribution type automatic steady flow three-phase separation device according to claim 1 is characterized in that: The high-flow fine separation module also includes a water phase collecting pipe and an oil phase collecting pipe; the main overflow conducting pipe and the hollow shaft both pass through the secondary separator and are connected to the oil phase collecting pipe; the secondary separator is connected to the water phase collecting pipe through a main underflow conducting pipe arranged at the bottom; the auxiliary screw housing is connected to the oil phase collecting pipe through an auxiliary overflow conducting pipe arranged at the bottom, and is connected to the water phase collecting pipe through an auxiliary underflow conducting pipe arranged at the bottom.

3. The phase redistribution type automatic steady flow three-phase separation device according to claim 1 is characterized in that: The three-phase separation device also includes a truncated cone tripod, and a supporting ring plate is installed outside the three-phase separation cylinder. The supporting ring plate is fixedly installed in the annular groove on the top of the truncated cone tripod.

4. The phase redistribution type automatic steady flow three-phase separation device according to claim 1, characterized in that: The water phase outlet of the three-phase separation cylinder is installed with a necked flange, and the top opening of the secondary separator is installed with a flange connector, the two ends of the flange connector are respectively a flange and a stepped disc, the flange is fixedly connected to the necked flange, and the stepped disc is threadedly connected to the top opening of the secondary separator.

5. The phase redistribution type automatic steady flow three-phase separation device according to claim 1, characterized in that: The tangential inlet sealing disk includes an outer stepped shaft shoulder and an inner stepped shaft shoulder, and the outer stepped shaft shoulder and the inner stepped shaft shoulder are respectively connected to the three-phase separation cylinder and the first-stage separator through threads; the tangential inlet sealing disk also includes a top cone, and the top cone is located inside the first-stage separator.

6. The phase redistribution type automatic steady flow three-phase separation device according to claim 1, characterized in that: A sand phase separation plate is installed inside the three-phase separation cylinder, and the sand phase separation cavity is formed between the sand phase separation plate and the three-phase separation cylinder.

7. The phase redistribution type automatic steady flow three-phase separation device according to claim 1, characterized in that: The secondary separator includes an overflow conducting hole and an overflow isolation plate; the hollow shaft is arranged inside the main overflow conducting pipe; the overflow isolation plate is located outside the main overflow conducting pipe, and an annular space area for gathering the oil phase is formed between the overflow isolation plate and the main overflow conducting pipe; the main overflow conducting pipe is installed in the overflow conducting hole.

8. The phase redistribution type automatic steady flow three-phase separation device according to claim 2, characterized in that: The water phase collecting pipe is an annular collecting pipe, which includes a secondary underflow connecting pipe, an annular channel, a main underflow connecting pipe and an underflow collecting pipe. The secondary underflow conducting pipe is flange-connected to the secondary underflow connecting pipe, the main underflow conducting pipe is flange-connected to the main underflow connecting pipe, and the secondary underflow connecting pipe and the main underflow connecting pipe are connected to the underflow collecting pipe through the annular channel.

9. The phase redistribution type automatic steady flow three-phase separation device according to claim 2, characterized in that: The high-flow fine separation module also includes an overflow connecting pipe, and both ends of the overflow connecting pipe are respectively connected to the auxiliary overflow conducting pipe and the oil phase collecting pipe; the oil phase collecting pipe is a forked collecting pipe, and the forked collecting pipe includes a collecting main pipe and a collecting auxiliary pipe. The main overflow conducting pipe and the hollow shaft are both connected to the forked collecting pipe through the collecting main pipe, and the auxiliary overflow conducting pipe is connected to the collecting auxiliary pipe through the overflow connecting pipe, and then connected to the forked collecting pipe.

10. The phase redistribution type automatic steady flow three-phase separation device according to claim 1, characterized in that: The high-flow fine separation module includes a plurality of auxiliary separation units, and a plurality of auxiliary through holes are evenly arranged along the circumferential direction at the lower part of the water phase separation chamber, and each of the auxiliary through holes is provided with a corresponding auxiliary separation unit.

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