A pulsating frequency adjustable cyclone separation device and method of use thereof

Abstract

The application provides a pulsation frequency adjustable cyclone separation device and a related use thereof. The pulsation frequency adjustable cyclone separation device comprises an oil-water separation module and at least two frequency control modules which are sequentially connected inside the cyclone separation device. The oil-water separation module comprises an outer cylinder, a spiral flow channel, an overflow pipe and a guide cone which are sequentially connected inside the outer cylinder. The overflow pipe comprises at least two overflow pipe sections which are connected. The guide cone comprises at least two guide cone sections which are connected. The frequency control module comprises a fixed valve, a first bevel gear, a second bevel gear, a hollow cylinder and a moving valve which are sequentially connected inside the fixed valve. The first bevel gear and the second bevel gear are meshed with each other. Compared with a conventional cyclone separation device, the cyclone separation device can improve the cyclone separation efficiency under different well conditions by changing the guide cone and the overflow pipe section number, and the separated oil phase can be efficiently produced and the water phase can be efficiently injected back to the formation at the same time through the frequency control module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oilfield development, in particular to a pulsation frequency adjustable cyclone separation device and a method thereof. BACKGROUND

[0002] With the continuous development of oilfield, the water content of oilfield produced liquid increases year by year, and the difficulty and cost of treating the oil-containing water on the ground gradually increase. Under this background, downhole oil-water separation and injection-production technology emerge as the times require. This technology can realize oil-water separation in the well and make the oil-rich phase lift to the ground and the water-rich phase back to the formation, providing technical support for stabilizing oil and controlling water and improving recovery. The existing injection-production technology in the same well uses the previous oil-water cyclone separation device, which has low separation efficiency, and the conventional sucker rod pump has low oil production efficiency, which to some extent affects the popularization and application of the injection-production technology in the same well. More importantly, with the development of oilfield, the oil-water separation ratio in the well changes constantly, and the conventional cyclone separation device can only be applied to one well condition and cannot realize efficient separation of oil-water phases with the change of well conditions. SUMMARY

[0003] The present application relates to the field of oilfield development, in particular to a pulsation frequency adjustable cyclone separation device and a method thereof.

[0004] In view of the above problems, the present application is proposed to provide a pulsation frequency adjustable cyclone separation device to overcome the above problems or at least partially solve the above problems.

[0005] The pulsation frequency adjustable cyclone separation device provided by the embodiment of the present application comprises: an oil-water separation module and at least two frequency control modules connected in sequence inside the cyclone separation device.

[0006] The oil-water separation module comprises: an outer cylinder, a spiral flow channel, an overflow pipe and a guide cone connected in sequence from top to bottom in the outer cylinder.

[0007] The overflow pipe comprises at least two overflow pipe sections, and the guide cone comprises at least two guide cone sections, each overflow pipe section and each guide cone section being connected in sequence.

[0008] The frequency control module comprises: a fixed valve, a first bevel gear, a second bevel gear, a hollow cylinder and a moving valve connected in sequence in the fixed valve.

[0009] The first bevel gear and the second bevel gear are meshed with each other, and the number of teeth of the first bevel gear is more than the number of teeth of the second bevel gear.

[0010] In some optional embodiments, the frequency control module is two, which are injection frequency control module and oil production frequency control module respectively;

[0011] The injection frequency control module comprises an injection pump fixed valve, an injection pump first bevel gear, an injection pump second bevel gear, an injection pump hollow cylinder and an injection pump moving valve which are connected in sequence in the injection pump fixed valve;

[0012] The oil production frequency control module comprises an oil production pump fixed valve, an oil production pump first bevel gear, an oil production pump second bevel gear, an oil production pump hollow cylinder and an oil production pump moving valve which are connected in sequence in the oil production pump fixed valve.

[0013] In some optional embodiments, the diameters of the overflow pipe segments are different, and the diameters of the overflow pipe segments gradually decrease from top to bottom;

[0014] The spiral flow channel is connected with the overflow pipe segment with the largest diameter.

[0015] In some optional embodiments, the spiral flow channel is hollow inside the overflow pipe.

[0016] In some optional embodiments, the diameters of the guide cone segments are different, and the diameters of the guide cone segments gradually increase from top to bottom;

[0017] The outer cylinder is connected with the guide cone segment with the largest diameter.

[0018] In some optional embodiments, a gear seat is arranged on the inner wall of the injection pump fixed valve; and a cylindrical center hole is opened at the center of the injection pump first bevel gear;

[0019] The injection pump first bevel gear is installed on the gear seat through the cylindrical center hole.

[0020] In some optional embodiments, a threaded hole is arranged on the injection pump fixed valve; and a positioning groove is opened on the injection pump hollow cylinder;

[0021] The injection pump hollow cylinder is connected with the injection pump fixed valve through the threaded hole and the positioning groove.

[0022] In some optional embodiments, a sliding groove is further arranged on the inner wall of the injection pump fixed valve; and a sliding port boss is arranged on the injection pump moving valve;

[0023] The injection pump moving valve and the injection pump fixed valve are connected through the cooperation of the sliding port boss and the sliding groove;

[0024] In some optional embodiments, a stepped gear seat and a frequency conversion groove are further arranged on the injection pump hollow cylinder; and a threaded through hole is further arranged on the injection pump moving valve;

[0025] The moving valve of the reinjection pump is connected with the variable frequency groove and the hollow cylinder of the reinjection pump through the threaded through hole.

[0026] The second bevel gear of the reinjection pump is installed on the stepped gear seat.

[0027] In some optional embodiments, the variable frequency groove is arranged in a wavy manner around the hollow cylinder of the reinjection pump.

[0028] In some optional embodiments, a gear seat is arranged on the inner wall of the fixed valve of the oil production pump; and a cylindrical center hole is formed at the center of the first bevel gear of the oil production pump.

[0029] The first bevel gear of the oil production pump is installed on the gear seat through the cylindrical center hole.

[0030] In some optional embodiments, a threaded hole is arranged on the fixed valve of the oil production pump; and a positioning groove is formed on the wall of the hollow cylinder of the oil production pump.

[0031] The hollow cylinder of the oil production pump is connected with the fixed valve of the reinjection pump through the threaded hole and the positioning groove.

[0032] In some optional embodiments, a sliding groove is further arranged on the inner wall of the fixed valve of the oil production pump; and a sliding port boss is arranged on the moving valve of the oil production pump.

[0033] The moving valve of the oil production pump is connected with the fixed valve of the oil production pump through cooperation of the sliding port boss and the sliding groove.

[0034] In some optional embodiments, a stepped gear seat and a variable frequency groove are further arranged on the hollow cylinder of the oil production pump; and a threaded through hole is further arranged on the moving valve of the oil production pump.

[0035] The moving valve of the oil production pump is connected with the variable frequency groove and the hollow cylinder of the oil production pump through the threaded through hole.

[0036] The second bevel gear of the oil production pump is installed on the stepped gear seat.

[0037] In some optional embodiments, the variable frequency groove is arranged in a wavy manner around the hollow cylinder of the oil production pump.

[0038] Based on the same inventive concept, the embodiments of the present application also provide a method for simultaneous injection and production in the same well by using the above-mentioned pulsation frequency adjustable cyclone separation device, which comprises the following steps:

[0039] According to the current well condition, the length between the overflow pipe and the guide cone is changed by adjusting the number of overflow pipe segments and the number of guide cone segments in the pulsation frequency adjustable cyclone separation device.

[0040] According to the frequency adjustment requirement of the regulation module in the pulsating frequency adjustable cyclone separation device, different first bevel gears and second bevel gears are adjusted to mesh with each other.

[0041] The pulsating frequency adjustable cyclone separation device is used for the same well injection and production operation.

[0042] The beneficial effects of the above technical solutions provided by the embodiments of the present application at least include:

[0043] The pulsating frequency adjustable cyclone separation device provided by the embodiments of the present application has the following structure: the overflow pipe includes at least two overflow pipe segments, the guide cone includes at least two guide cone segments, and each overflow pipe segment and each guide cone segment are connected in sequence; the frequency regulation module includes a first bevel gear and a second bevel gear that mesh with each other; therefore, the length between the overflow pipe and the guide cone can be changed by changing the number of segments of the overflow pipe and the guide cone in the oil-water separation module, so as to realize efficient separation of the water phase and the oil phase in the oil-water separation module under different well conditions; and the conversion of different frequencies of the regulation module can be realized by adjusting the size of the first bevel gear and the second bevel gear that mesh with each other in the regulation module, so as to efficiently produce oil while injecting water into the formation, improve the oil-water separation efficiency of the same well injection and production process, and the cyclone separation device provided by the embodiments of the present application is used in combination with frequency conversion oil production and frequency conversion injection and efficient oil-water separation, has a simple overall appearance structure, is easy to manufacture, is more suitable for the limited radial space in the well, provides protection for accurate control in the well, and provides technical support for the popularization and application of the same well injection and production technology.

[0044] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and achieved by the structure particularly pointed out in the written description, claims, and drawings.

[0045] The technical solutions of the present application will be further described in detail below by means of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0047] Figure 1 The schematic diagram of the pulsating frequency adjustable cyclone separation device of the embodiments of the present application.

[0048] Figure 2 The cross-sectional view of the pulsating frequency adjustable cyclone separation device of the embodiments of the present application.

[0049] Figure 3The exploded view of the pulse frequency adjustable cyclone separation device of the embodiment of the present application.

[0050] Figure 4 The schematic diagram of the oil-water separation module of the embodiment of the present application.

[0051] Figure 5 The sectional view of the oil-water separation module of the embodiment of the present application.

[0052] Figure 6 The exploded view of the oil-water separation module of the embodiment of the present application.

[0053] Figure 7 The sectional view of the spiral flow channel of the embodiment of the present application.

[0054] Figure 8 The sectional view of the second section of the overflow pipe of the embodiment of the present application.

[0055] Figure 9 The sectional view of the fourth section of the overflow pipe of the embodiment of the present application.

[0056] Figure 10 The sectional view of the first section of the guide cone of the embodiment of the present application.

[0057] Figure 11 The sectional view of the fourth section of the guide cone of the embodiment of the present application.

[0058] Figure 12 The schematic diagram of the sixth section of the guide cone of the embodiment of the present application.

[0059] Figure 13 The schematic diagram of the reinjection frequency regulation module of the embodiment of the present application.

[0060] Figure 14 The sectional view of the reinjection frequency regulation module of the embodiment of the present application.

[0061] Figure 15 The exploded view of the reinjection frequency regulation module of the embodiment of the present application.

[0062] Figure 16 The sectional view of the fixed valve of the reinjection pump of the embodiment of the present application.

[0063] Figure 17 The schematic diagram of the first bevel gear of the reinjection pump of the embodiment of the present application.

[0064] Figure 18 The schematic diagram of the hollow cylinder of the reinjection pump of the embodiment of the present application.

[0065] Figure 19 The schematic diagram of the moving valve of the reinjection pump of the embodiment of the present application.

[0066] Figure 20 The schematic diagram of the oil production frequency regulation module of the embodiment of the present application.

[0067] Figure 21 The profile view of the oil production frequency regulation module for the embodiment of the present application.

[0068] Figure 22 The exploded view of the oil production frequency regulation module for the embodiment of the present application.

[0069] Figure 23 The profile view of the oil production pump fixed valve for the embodiment of the present application.

[0070] Figure 24 The schematic diagram of the first bevel gear of the oil production pump for the embodiment of the present application.

[0071] Figure 25 The schematic diagram of the hollow cylinder of the oil production pump for the embodiment of the present application.

[0072] Figure 26 The schematic diagram of the moving valve of the oil production pump for the embodiment of the present application.

[0073] Figure 27 The schematic diagram of the method for the same-well injection and production using the pulsating frequency adjustable cyclone separation device for the embodiment of the present application.

[0074] Explanation of reference signs:

[0075] 1-oil-water separation module, 2-injection frequency regulation module, 3-oil production frequency regulation module, 4-outer cylinder, 5-spiral flow channel, 6-overflow pipe first section, 7-overflow pipe second section, 8-overflow pipe third section, 9-overflow pipe fourth section, 10-guide cone first section, 11-guide cone second section, 12-guide cone third section, 13-guide cone fourth section, 14-guide cone fifth section, 15-guide cone sixth section, 16-injection pump fixed valve, 17-injection pump first bevel gear, 18-injection pump second bevel gear, 19-injection pump hollow cylinder, 20-injection pump moving valve, 21-oil production pump fixed valve, 22-oil production pump first bevel gear, 23-oil production pump second bevel gear, 24-oil production pump hollow cylinder, 25-oil production pump moving valve, 26-injection pump connecting rod, 27-oil production pump connecting rod;

[0076] 401-thread;

[0077] 501-internal thread;

[0078] 601-external thread, 602-internal thread;

[0079] 701-external thread, 702-internal thread;

[0080] 801-external thread, 802-internal thread;

[0081] 901-external thread, 902-internal thread;

[0082] 101-internal thread;

[0083] 111 - external thread, 112 - internal thread;

[0084] 121 - external thread, 122 - internal thread;

[0085] 131 - external thread, 132 - internal thread;

[0086] 141 - external thread, 142 - internal thread;

[0087] 151 - external thread, 152 - tapered section;

[0088] 161 - through hole, 162 - boss, 163 - thread, 164 - gear seat, 165 - boss, 166 - thickened wall plate, 167 - boss, 168 - tapered through hole, 169 - sliding groove, 1610 - threaded hole;

[0089] 171 - cylindrical hole, 172 - cylindrical center hole;

[0090] 191 - variable frequency groove, 192 - positioning groove, 193 - stepped gear seat, 194 - circumferentially equidistant threaded hole;

[0091] 201 - sliding port boss, 202 - threaded through hole, 203 - water injection through hole;

[0092] 211 - through hole, 212 - boss, 213 - thread, 214 - gear seat, 215 - boss, 216 - thickened wall plate, 217 - boss, 218 - tapered through hole, 219 - sliding groove, 2110 - threaded hole;

[0093] 221 - cylindrical hole, 222 - cylindrical center hole;

[0094] 241 - variable frequency groove, 242 - positioning groove, 243 - stepped gear seat, 244 - circumferentially equidistant threaded hole;

[0095] 251 - sliding port boss, 252 - threaded through hole, 253 - oil extraction through hole. DETAILED DESCRIPTION

[0096] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be thoroughly understood and fully conveyed to those skilled in the art.

[0097] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0098] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0099] In order to solve the problem that the cyclone separation device in the prior art cannot realize high-efficiency separation of different well conditions of oil-water two-phase and cannot realize high-efficiency production of separated oil phase and high-efficiency injection of water phase, the embodiment of the present application provides a pulsation frequency adjustable type cyclone separation device, which can realize high-efficiency separation of oil and water and conversion of frequency of oil production and injection module by selecting lengths of guide cone and overflow pipe and different gear meshing according to different well conditions. The present application innovatively uses variable frequency oil production and variable frequency injection together with high-efficiency separation of oil and water, thereby improving the oil-water separation efficiency of the injection-production process in the same well.

[0100] The pulsation frequency adjustable type cyclone separation device provided by the embodiment of the present application comprises an oil-water separation module and at least two frequency control modules connected in sequence inside the cyclone separation device.

[0101] The oil-water separation module comprises an outer cylinder, a spiral flow channel, an overflow pipe and a guide cone connected in sequence from top to bottom in the outer cylinder, and the overflow pipe comprises at least two overflow pipe sections, and the guide cone comprises at least two guide cone sections, and each overflow pipe section and each guide cone section are connected in sequence.

[0102] The frequency control module comprises a fixed valve, a first bevel gear, a second bevel gear, a hollow cylinder and a moving valve connected in sequence in the fixed valve, wherein the first bevel gear and the second bevel gear are meshed with each other, and the number of teeth of the first bevel gear is more than the number of teeth of the second bevel gear.

[0103] As Figures 1-3As shown, the frequency control modules of the cyclone separation device provided in the embodiment of the present invention can be, for example, two, namely the reinjection frequency control module 2 and the oil production frequency control module 3; and the oil production frequency control module 3, the reinjection frequency control module 2 and the oil-water separation module 1 are connected in sequence from top to bottom in the cyclone separation device.

[0104] like Figures 4-5 As shown, the oil-water separation module 1 of the cyclone separation device provided in an embodiment of the present invention comprises: an outer cylinder 4, a spiral flow channel 5 connected to the outer cylinder 4 from top to bottom, an overflow pipe, and a guide cone. The overflow pipe includes four overflow pipe sections: overflow pipe section 1 6, overflow pipe section 2 7, overflow pipe section 3 8, and overflow pipe section 4 9; the guide cone includes six guide cone sections: guide cone section 1 10, guide cone section 2 11, guide cone section 3 12, guide cone section 4 13, guide cone section 5 14, and guide cone section 6 15. The diameter of each overflow pipe section is different, gradually decreasing from top to bottom, that is, from overflow pipe section 1 6 to overflow pipe section 4 9; similarly, the diameter of each guide cone section is different and gradually increases from top to bottom, that is, from guide cone section 6 15 to guide cone section 10.

[0105] like Figures 6-12 As shown, in the cyclone separation device provided by the embodiment of the present invention, the guide cone and the overflow pipe, the spiral flow channel 5 and the outer cylinder 4 are all provided with threads to facilitate connection.

[0106] The outer cylinder 4 is connected to the cyclone separation device through a thread 401; the spiral flow channel 5 is fixed inside the outer cylinder 4 through a threaded connection, and the guide cone section 10 is fixed in the outer cylinder 4 through a connecting plate (not shown in the figure). The internal thread 501 at the bottom of the spiral flow channel 5 is connected to the external thread 601 at the top of the overflow pipe section 1 6, the internal thread 602 at the bottom of the overflow pipe section 1 6 is connected to the external thread 701 at the top of the overflow pipe section 2 7, the internal thread 702 at the bottom of the overflow pipe section 2 7 is connected to the external thread 801 at the top of the overflow pipe section 3 8, the internal thread 802 at the bottom of the overflow pipe section 3 8 is connected to the external thread 901 at the top of the overflow pipe section 4 9 The internal thread 101 at the top of the guide cone section 10 is connected to the external thread 111 at the bottom of the guide cone section 2, the internal thread 112 at the top of the guide cone section 11 is connected to the external thread 121 at the bottom of the guide cone section 3, the internal thread 122 at the top of the guide cone section 12 is connected to the external thread 131 at the bottom of the guide cone section 4, the internal thread 132 at the top of the guide cone section 4 is connected to the external thread 141 at the bottom of the guide cone section 5, the external thread 151 at the guide cone section 6 is connected to the internal thread 142 at the top of the guide cone section 5; the cavity formed between the outer cylinder 4 and the spiral flow channel 5, the overflow pipe and the guide cone is a separation cavity; Figure 12 The top of the guide cone section 15 is provided with a cone section 152, and the wedge-shaped space formed by the cone section 152 and the outer cylinder 4 can better lift the separated oil phase, and the spiral flow channel 5 and the overflow pipe are hollow, providing a guide channel for the separated oil phase to flow out of the oil-water separation module.

[0107] Optionally, the number of overflow pipe segments and guide cone segments included in the overflow pipe and guide cone, the diameter, and the connection method between each overflow pipe segment and each guide cone segment can be selected according to actual application conditions while meeting process requirements, and the embodiments of the present invention do not limit this.

[0108] It should be noted that the distance between the top of the guide cone structure and the bottom of the overflow pipe structure is called the oil core length, and the size of the oil core length affects the oil-water separation efficiency. According to different well conditions such as the downhole oil content, oil viscosity and other polymers, adjusting the oil core length under reasonable structure can achieve higher separation efficiency. Before oil production, technicians in this technical field can adjust the appropriate oil core length for different well conditions based on relevant experience or simulation methods. The guide sections and overflow pipe sections of the embodiment of the present invention are connected by threads, which are convenient for disassembly and assembly. Without changing the equipment, the appropriate oil core length can be adjusted by changing the number of overflow pipe sections and guide cone sections, thereby improving the oil-water separation efficiency and saving equipment manufacturing costs.

[0109] When performing oil-water separation in the cyclone separation device provided in an embodiment of the present invention, after the oil-water mixture enters the oil-water separation module, it is accelerated through the spiral flow channel 5 into the separation chamber. Under the action of the centrifugal force, the oil and water phases are separated in the separation chamber. Due to the lower density of the oil phase, the separated oil phase gathers at the central axis of the separation chamber and then flows out of the oil-water separation module 1 through the overflow pipe and the guide channel of the spiral flow channel 5. The separated water phase is thrown onto the inner wall of the outer cylinder 4 under the action of the centrifugal force. Under the action of the centrifugal force, it moves downward along the inner wall of the outer cylinder 4, flows into the liquid guide ring cavity (not shown in the figure), and then exits the oil-water separation module 1.

[0110] like Figures 13-15 As shown, the reinjection frequency control module 2 includes: a fixed valve 16 of the reinjection pump, a first bevel gear 17 of the reinjection pump connected in sequence to the fixed valve 16 of the reinjection pump, a second bevel gear 18 of the reinjection pump, a hollow cylinder 19 of the reinjection pump and a movable valve 20 of the reinjection pump; and the first bevel gear 17 of the reinjection pump and the second bevel gear 18 of the reinjection pump are engaged with each other, so that when the first bevel gear 17 of the reinjection pump rotates, the second bevel gear 18 of the reinjection pump is driven to rotate.

[0111] like Figures 16-19As shown, the inner wall of the fixed valve 16 of the reinjection pump is provided with a gear seat 164, and the gear seat 164 is provided with threads 163; the first bevel gear 17 of the reinjection pump is provided with a cylindrical center hole 172 at the center and a cylindrical hole 171 at the end, a cylindrical pin is installed in the cylindrical hole 171, and the cylindrical pin is connected with the connecting rod 26 of the reinjection pump through a sleeve, the connecting rod 26 of the reinjection pump is fixed with the first bevel gear 17 of the reinjection pump through a bayonet pin; the first bevel gear 17 of the reinjection pump is matched with the gear seat 164 on the fixed valve 16 through two high-alloy steel bearing bushings in the cylindrical center hole 172, is adjusted by a gear gasket, and is finally fixed by a hexagonal nut used in cooperation with the threads 163. The external water pump of the connecting rod 26 of the reinjection pump is connected, and in working, the water pump drives the connecting rod 26 of the reinjection pump to move, and further drives the first bevel gear 17 of the reinjection pump to rotate on the gear seat 164.

[0112] Optionally, the fixed valve 16 of the reinjection pump is provided with a threaded hole 1610, and a small thickened wall plate 166 is additionally arranged at the position where the threaded hole 1610 is arranged to reinforce the threaded hole 1610, so as to prevent the outer wall of the fixed valve of the oil pump from being deformed or the threaded hole from being deformed, burrs and the like when drilling the threaded hole; the hollow cylinder 19 of the reinjection pump is provided with a positioning groove 192 and a stepped gear seat 193;

[0113] The hollow cylinder 19 of the reinjection pump is connected with the fixed valve 16 of the reinjection pump through the positioning groove 192 and the threaded hole 1610, in the connection, the axial positioning is first completed through the boss 165 arranged inside the fixed valve 16 of the reinjection pump, and then the positioning groove 192 of the hollow cylinder 19 of the reinjection pump and the threaded hole 1610 on the fixed valve 16 of the reinjection pump form a locking structure; the second bevel gear 18 of the reinjection pump is fixed on the stepped gear seat 193 of the hollow cylinder 19 of the reinjection pump through a flat key small interference connection mode, so that the second bevel gear 18 of the reinjection pump drives the hollow cylinder 19 of the reinjection pump to rotate coaxially in the process of rotating; and the locking structure formed by the positioning groove 192 and the threaded hole 1610 on the hollow cylinder 19 of the reinjection pump can radially position the hollow cylinder 19 of the reinjection pump when rotating.

[0114] Optionally, the inner wall of the fixed valve 16 of the reinjection pump is further provided with a sliding groove 169; the movable valve 20 of the reinjection pump is provided with a sliding port boss 201; the movable valve 20 of the reinjection pump is connected with the fixed valve 16 of the reinjection pump through the cooperation of the sliding port boss 201 and the sliding groove 169;

[0115] The variable frequency groove 191 is arranged in a wave shape around the backflow pump hollow cylinder 19. The backflow pump moving valve 20 is connected with the backflow pump hollow cylinder 19 through the threaded through hole 202 and the variable frequency groove 191. The variable frequency groove 191 forms a locking structure with the threaded hole 202 through a high alloy steel sliding pin, and the boss provided on the threaded through hole is positioned for the high alloy steel sliding pin, so that the backflow pump hollow cylinder 19 drives the backflow pump moving valve 20 to move up and down in the process of rotation, and the cooperation of the sliding groove 169 and the sliding port boss 201 provides axial positioning for the up and down movement of the backflow pump moving valve 20.

[0116] In some optional embodiments, the backflow pump fixed valve 16 is provided with a tapered through hole 168 at the bottom, and the backflow pump moving valve 20 is provided with a water injection through hole 203. The tapered through hole 168 is communicated with the water injection through hole 193 to enable the water phase separated by the oil-water separation module to enter the backflow frequency control module 2. The backflow pump fixed valve 16 is further provided with a through hole 161 at the upper portion, and the backflow pump hollow cylinder 19 is provided with a circumferential equidistant threaded hole 194 at the upper end. The circumferential equidistant threaded hole 194 is communicated with the through hole 161 to enable the water phase to be backflowed to the stratum through the backflow control module 2. The backflow pump fixed valve 16 is provided with a boss 162 and a boss 167 on the two end faces, respectively, which play a positioning role in the process of connecting the backflow pump fixed valve 16 with the connecting structure.

[0117] It should be noted that the position and size of the threaded hole 1610 on the backflow pump fixed valve 16 correspond to the position and width of the positioning groove 192 on the backflow pump hollow cylinder 19, and the number of the threaded hole 1610 meets the process requirements. The sliding groove 169 provided on the inner wall of the backflow pump fixed valve 16 and the sliding port boss 201 provided on the backflow pump moving valve 20 are correspondingly arranged in terms of quantity, shape, size and position, and meet the process requirements. Furthermore, the size and position of the threaded through hole 202 on the backflow pump moving valve 20 correspond to the size and position of the variable frequency groove 191 on the backflow pump hollow cylinder 19, and the number of the threaded through hole 202 meets the process requirements. The above embodiments of the present application are not limited.

[0118] The back-feeding frequency regulation module 2 is connected with an external water pump through a back-feeding pump connecting rod 26. The frequency of the water pump is determined. The back-feeding pump connecting rod 26 drives the back-feeding pump first bevel gear 17 to rotate under the drive of the water pump, and then drives the back-feeding pump second bevel gear 18 meshing with the back-feeding pump first bevel gear 17 to rotate, transmits the motion to the back-feeding pump second bevel gear 18. Since the number of teeth of the back-feeding pump first bevel gear 17 is more than that of the back-feeding pump second bevel gear 18, the conversion from low frequency to high frequency is completed. The rotation of the back-feeding pump second bevel gear 18 drives the back-feeding pump hollow cylinder 19 to rotate, and drives the back-feeding pump moving valve 20 to perform high-efficiency reciprocating motion, thereby realizing linkage function, and then makes the water phase entering the back-feeding frequency regulation module 2 back to the formation in a high-frequency state. In the selection process, the technician can adjust the combination of the back-feeding pump first bevel gear and the back-feeding pump second bevel gear according to the process requirements to achieve different frequency conversion.

[0119] In some optional embodiments, as shown in Figures 20-22 The oil production frequency regulation module 3 comprises an oil production pump fixed valve 21, an oil production pump first bevel gear 22, an oil production pump second bevel gear 23, an oil production pump hollow cylinder 24 and an oil production pump moving valve 25 connected in sequence in the oil production pump fixed valve 21, and the oil production pump first bevel gear 22 and the oil production pump second bevel gear 23 are meshed with each other, so that the oil production pump first bevel gear 22 drives the oil production pump second bevel gear 23 to rotate when the oil production pump first bevel gear 22 rotates.

[0120] As shown in Figures 23-26 The oil production pump fixed valve 21 is provided with a gear seat 214 on the inner wall, and the gear seat 214 is provided with a thread 213. The oil production pump first bevel gear 22 is provided with a cylindrical center hole 222 in the center and a cylindrical hole 221 at the end. A cylindrical pin is installed in the cylindrical hole 221, connected with the oil production pump connecting rod 26 through a sleeve, and connected with the oil production pump connecting rod 27 through a bayonet pin. The oil production pump first bevel gear 22 is matched with the gear seat 214 on the fixed valve 21 through two high-alloy steel bearing bushings in the cylindrical center hole 222, adjusted by a gear gasket, and finally fixed by a hexagonal nut used in cooperation with the thread 213. The oil production pump connecting rod 27 is connected with an external oil pump. In operation, the oil pump drives the oil production pump connecting rod 26 to move, and then drives the oil production pump first bevel gear 22 to rotate on the gear seat 214.

[0121] Optionally, the oil production pump fixed valve 21 is provided with a threaded hole 2110, and a small thickened wall plate 216 is additionally provided at the position of the threaded hole 2120 to reinforce the threaded hole 2110, so as to prevent the deformation of the outer wall of the oil production pump fixed valve or the deformation, burr and the like of the threaded hole during drilling of the threaded hole. The oil production pump hollow cylinder 24 is provided with a positioning groove 242 and a stepped gear seat 243.

[0122] The hollow cylinder 24 of the oil production pump is connected with the fixed valve 21 of the oil production pump through the positioning groove 242 and the threaded hole 2110. In the connection, the axial positioning is first completed through the boss 215 arranged inside the fixed valve 21 of the oil production pump, and then the positioning groove 242 of the hollow cylinder 24 of the oil production pump and the threaded hole 2110 on the fixed valve 21 of the oil production pump form a locking structure. The second bevel gear 23 of the oil production pump is fixed on the stepped gear seat 243 of the hollow cylinder 24 of the oil production pump through the flat key small interference connection mode, so that the second bevel gear 23 of the oil production pump drives the hollow cylinder 24 of the oil production pump to rotate coaxially in the process of rotation. The locking structure formed by the positioning groove 242 and the threaded hole 2110 on the hollow cylinder 24 of the oil production pump can perform radial positioning when the hollow cylinder of the oil production pump rotates.

[0123] Optionally, the inner wall of the fixed valve 21 of the oil production pump is further provided with a sliding groove 219. The movable valve 25 of the oil production pump is provided with a sliding port boss 251. The movable valve 25 of the oil production pump is connected with the fixed valve 21 of the oil production pump through the cooperation of the sliding port boss 251 and the sliding groove 219.

[0124] The hollow cylinder 24 of the oil production pump is further provided with a variable frequency groove 241, which is arranged in a wave shape around the hollow cylinder 24 of the oil production pump. The movable valve 25 of the oil production pump is connected with the hollow cylinder 24 of the oil production pump through the threaded through hole 252 and the variable frequency groove 241. The variable frequency groove 241 forms a locking structure with the threaded hole 202 through a high-alloy steel sliding pin. The boss arranged on the threaded through hole is positioned for the high-alloy steel sliding pin. In the process of rotation of the hollow cylinder 24 of the oil production pump, the movable valve 25 of the oil production pump is driven to move up and down through the variable frequency groove 241. At the same time, the cooperation of the sliding groove 219 and the sliding port boss 251 provides axial positioning for the up-and-down movement of the movable valve 25 of the oil production pump.

[0125] In some optional embodiments, the fixed valve 21 of the oil production pump is provided with a tapered through hole 218 at the bottom. The movable valve 25 of the oil production pump is provided with an oil production through hole 253. The tapered through hole 218 and the oil production through hole 253 are communicated to enable the oil phase separated by the oil-water separation module to enter the inside of the oil production frequency regulation module. The fixed valve 21 of the oil production pump is further provided with a through hole 211 at the upper part. The upper end of the hollow cylinder 24 of the oil production pump is provided with a circumferentially equidistant threaded hole 244. The circumferentially equidistant threaded hole 244 is communicated with the through hole 211 to enable the oil phase to be produced to the ground through the oil production regulation module 3. The fixed valve 21 of the oil production pump is respectively provided with a boss 212 and a boss 217 on the two end faces. The bosses 212 and 217 play a positioning role in the connection process of the fixed valve 21 of the oil production pump and the communication structure.

[0126] It should be noted that the position and size of the threaded hole 2110 on the fixed valve 21 of the oil pump correspond to the position and width of the positioning groove 242 on the hollow cylinder 24 of the oil pump, the number of threaded holes 2110 meets the process requirements, the sliding groove 219 on the inner wall of the fixed valve 21 of the oil pump and the sliding port boss 251 on the outer wall of the movable valve 25 of the oil pump are correspondingly set in terms of number, shape, size and position, and meet the process requirements; Furthermore, the size and position of the threaded hole 252 on the movable valve 25 of the oil pump should be correspondingly set with the size and position of the frequency conversion groove on the hollow cylinder of the oil pump, and the number of threaded holes 252 meets the process requirements; The above embodiments of the present application are not limited.

[0127] The oil extraction frequency control module is connected with the external oil pump through the oil pump connecting rod 27, the frequency of the oil pump is determined, the oil pump connecting rod 27 drives the oil pump first bevel gear to rotate under the drive of the oil pump, and then drives the oil pump second bevel gear 23 meshing with the oil pump first bevel gear 22 to rotate, and the frequency is transmitted to the second bevel gear 23, because the number of teeth of the oil pump first bevel gear 22 meshing with each other is more than that of the oil pump second bevel gear 23, the conversion from low frequency to high frequency is completed, the rotation of the oil pump second bevel gear 23 drives the oil pump hollow cylinder 24 to rotate, and the oil pump movable valve 25 is driven to reciprocate efficiently, thereby realizing the linkage function, and then the water phase entering the oil extraction frequency control module is extracted to the formation under the high frequency state. In the selection process, the technician can adjust the combination of the oil pump first bevel gear and the oil pump second bevel gear according to the process requirements to achieve different frequency conversion.

[0128] The skilled person in the art can select different gear combinations according to the process requirements, when converting different frequency conversion structures, only the gear combination needs to be replaced to a certain extent, which is simple and convenient, reduces the manufacturing cost of related equipment, and improves the economic benefit.

[0129] The cyclone separation device provided by the embodiment of the present application has a cylindrical structure, without redundant branch structures, and is simple and beautiful in whole; and the high-efficiency oil-water separation, the variable-frequency reinjection and the variable-frequency oil extraction structures are arranged in the same device and used cooperatively, the functions are clearly divided, the design is ingenious, and the device is suitable for the limited radial space in the well.

[0130] Furthermore, the regulating module of the cyclone separation device is realized by the movement of the connecting rod driven by the pump body, the connecting rod is connected with the first bevel gear, the first bevel gear is engaged with the second bevel gear, the hollow cylinder is driven to rotate, and the moving valve is driven to move up and down at high speed to realize the linkage function, and the conversion from low frequency to high frequency is realized due to the number of teeth of the first bevel gear being more than that of the second bevel gear. The oil extraction frequency regulating module and the reinjection frequency regulating module are similar in structure, the machining process of the device structure can be reduced, and the comprehensive use value is high.

[0131] In some optional embodiments, the oil extraction frequency regulating module, the reinjection frequency regulating module and the oil-water separation module are sequentially connected in the cyclone separation device through the connecting structure from top to bottom; optionally, the oil-water separation module and the oil extraction frequency regulating module can be connected through the three-bridge channel, and the reinjection frequency control module and the oil extraction frequency regulating module can be connected through the centralizer, the bridge channel and the connecting pipe.

[0132] Based on the same inventive concept, the embodiment of the present application also provides a method for simultaneous injection and extraction in the same well by using the above-mentioned pulsating frequency adjustable cyclone separation device, as shown in Figure 27 , which comprises the following steps:

[0133] S1, according to the current well condition, the length between the overflow pipe and the guide cone is changed by adjusting the number of overflow pipe segments and the number of guide cone segments in the pulsating frequency adjustable cyclone separation device;

[0134] S2, according to the frequency requirement of the regulating module in the pulsating frequency adjustable cyclone separation device, the first bevel gear and the second bevel gear are engaged;

[0135] S3, the pulsating frequency adjustable cyclone separation device is used for simultaneous injection and extraction operation.

[0136] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for describing the above-mentioned embodiments, but those skilled in the art should recognize that various embodiments can be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations falling within the scope of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the coverage of the term is similar to the term "including", as explained in the context of "including" used as a transitional word in the claims. In addition, the use of any one term "or" in the specification or claims is intended to mean "non-exclusive or".

Claims

1. A cyclone separation device with adjustable pulsation frequency, characterized in that: include: An oil-water separation module and a frequency control module are sequentially connected to the cyclone separation device; The oil-water separation module comprises: an outer cylinder, a spiral flow channel, an overflow pipe and a guide cone connected in sequence from top to bottom in the outer cylinder; The overflow pipe includes at least two overflow pipe sections, and the guide cone includes at least two guide cone sections, and the overflow pipe sections are sequentially connected to each other, and the guide cone sections are sequentially connected to each other; There are two frequency control modules, namely a reinjection frequency control module and an oil production frequency control module; The reinjection frequency control module includes: a fixed valve of the reinjection pump, a first bevel gear of the reinjection pump connected in sequence to the fixed valve of the reinjection pump, a second bevel gear of the reinjection pump, a hollow cylinder of the reinjection pump, and a movable valve of the reinjection pump; the first bevel gear of the reinjection pump and the second bevel gear of the reinjection pump are meshed with each other, and the number of teeth of the first bevel gear of the reinjection pump is greater than the number of teeth of the second bevel gear of the reinjection pump; The oil production frequency control module includes: a fixed valve of the oil production pump, a first bevel gear of the oil production pump connected in sequence in the fixed valve of the oil production pump, a second bevel gear of the oil production pump, a hollow cylinder of the oil production pump and a movable valve of the oil production pump; the first bevel gear of the oil production pump and the second bevel gear of the oil production pump are meshed with each other, and the number of teeth of the first bevel gear of the oil production pump is greater than the number of teeth of the second bevel gear of the oil production pump.

2. The cyclone separation device with adjustable pulsation frequency according to claim 1, characterized in that: The overflow pipe sections have different diameters, and the diameters of the overflow pipe sections gradually decrease from top to bottom; The spiral flow channel is connected to the overflow pipe section with the largest diameter.

3. The cyclone separation device with adjustable pulsation frequency according to claim 2, characterized in that: The spiral flow channel and the overflow pipe are hollow inside.

4. The cyclone separation device with adjustable pulsation frequency according to claim 1, characterized in that: The diameters of the guide cone sections are different, and the diameters of the guide cone sections gradually increase from top to bottom; The outer cylinder is connected to the guide cone section with the largest diameter.

5. The cyclone separation device with adjustable pulsation frequency according to claim 1, characterized in that: A gear seat is provided on the inner wall of the fixed valve of the reinjection pump; a cylindrical center hole is opened at the center of the first bevel gear of the reinjection pump; The first bevel gear of the re-injection pump is installed on the gear seat through the cylindrical center hole.

6. The cyclone separation device with adjustable pulsation frequency according to claim 5, characterized in that: The fixing valve of the reinjection pump is provided with a threaded hole; the hollow cylinder of the reinjection pump is provided with a positioning groove; The hollow cylinder of the reinjection pump is fixedly connected to the reinjection pump through the threaded hole and the positioning groove.

7. The cyclone separation device with adjustable pulsation frequency according to claim 5, characterized in that: The inner wall of the fixed valve of the reinjection pump is also provided with a slide groove; the movable valve of the reinjection pump is provided with a sliding boss; The movable valve of the reinjection pump and the fixed valve of the reinjection pump are connected through the cooperation of the sliding boss and the sliding groove.

8. The cyclone separation device with adjustable pulsation frequency according to claim 5, characterized in that: The hollow cylinder of the reinjection pump is also provided with a stepped gear seat and a frequency conversion groove; the movable valve of the reinjection pump is also provided with a threaded through hole; The movable valve of the reinjection pump is connected to the hollow cylinder of the reinjection pump through the threaded through hole and the frequency conversion groove; The second bevel gear of the re-injection pump is installed on the stepped gear seat.

9. The cyclone separation device with adjustable pulsation frequency according to claim 8, characterized in that: The frequency conversion groove is arranged in a wave-like manner on the hollow cylinder of the reinjection pump.

10. The cyclone separation device with adjustable pulsation frequency according to claim 1, characterized in that: A gear seat is provided on the inner wall of the fixed valve of the oil production pump; a cylindrical center hole is opened at the center of the first bevel gear of the oil production pump; The first bevel gear of the oil production pump is installed on the gear seat through the cylindrical center hole.

11. The cyclone separation device with adjustable pulsation frequency according to claim 10, characterized in that: The oil pump fixing valve is provided with a threaded hole; the hollow cylinder wall of the oil pump is provided with a positioning groove; The hollow cylinder of the oil production pump is connected to the fixed valve of the oil production pump through the threaded hole and the positioning groove.

12. The cyclone separation device with adjustable pulsation frequency according to claim 10, characterized in that: The inner wall of the fixed valve of the oil pump is also provided with a slide groove; the movable valve of the oil pump is provided with a sliding boss; The movable valve of the oil production pump and the fixed valve of the oil production pump are connected through the cooperation of the sliding boss and the sliding groove.

13. The cyclone separation device with adjustable pulsation frequency according to claim 10, characterized in that: The hollow cylinder of the oil production pump is also provided with a stepped gear seat and a frequency conversion groove; the movable valve of the oil production pump is also provided with a threaded through hole; The movable valve of the oil production pump is connected to the hollow cylinder of the oil production pump through the threaded through hole and the frequency conversion groove; The second bevel gear of the oil production pump is mounted on the stepped gear seat.

14. The cyclone separation device with adjustable pulsation frequency according to claim 13, characterized in that: The frequency conversion groove is arranged in a wave-like manner on the hollow cylinder of the reinjection pump.

15. A method for injection and production in the same well using the pulsation frequency adjustable cyclone separation device according to claims 1-14, characterized in that: include: According to the current well conditions, the length between the overflow pipe and the guide cone is changed by adjusting the number of overflow pipe sections and the number of guide cone sections in the pulsation frequency adjustable cyclone separation device; According to the frequency requirement of the control module in the cyclone separation device with adjustable pulse frequency, adjusting the different first bevel gears to mesh with the second bevel gears; Use the adjusted pulsation frequency adjustable cyclone separation device to carry out injection and production operations in the same well.

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