A lost circulation circulating device while drilling

Abstract

This utility model relates to a drilling-while-operating (DWI) plugging and circulation device, including a delivery mechanism for conveying plugging fluid and a drive mechanism. The delivery mechanism includes a signal transmission component disposed in a first drill collar and a switching component disposed in a second drill collar. The second drill collar is provided with a bypass hole for connecting the flow channel in the delivery mechanism and the annulus between the DWI plugging and circulation device and the wellbore. The drive mechanism is configured to open or close the bypass hole through hydraulic pressure after the signal transmission component receives a signal, thereby switching the delivery mechanism between plugging and circulation states. This allows for the transmission of wireless signals from the wellhead to the downhole to control the drive mechanism, which in turn drives the switching component of the delivery mechanism to open or close the bypass hole, thus enabling an unlimited number of plugging operations. The DWI plugging and circulation device eliminates the need for a ball seat for ball-dropping and pressure buildup, ensuring a larger flow diameter.

Description

Technical Field

[0001] This utility model relates to the field of well drilling plugging technology, specifically to a well-drilling plugging circulation device. Background Technology

[0002] Currently, domestic drilling plugging and circulation devices typically use wellhead ball dropping to control the opening and closing of bypass holes. These devices have drawbacks such as limited opening and closing times, high requirements for plugging discharge rate and pump pressure, and small inner diameter. Utility Model Content

[0003] In view of the above-mentioned problems in the existing technology, the present invention provides a drilling plugging circulation device that can complete an unlimited number of plugging operations, has no requirements on the discharge volume of subsequent operations, and can ensure a large flow diameter in both the open and closed states.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to provide a drilling plugging circulation device, comprising,

[0005] A delivery mechanism for delivering plugging fluid, the delivery mechanism including a signal transmission component disposed within a first drill collar and a switching component disposed within a second drill collar, the second drill collar having a bypass hole for connecting the flow channel within the delivery mechanism and the annulus between the drilling plugging circulation device and the wellbore; and

[0006] Drive mechanism;

[0007] The drive mechanism is configured to open or close the bypass hole by hydraulic pressure after the signal transmission component receives a signal, so as to switch the conveying mechanism between a plugging state and a circulation state.

[0008] Furthermore, the switching assembly includes a piston cylinder disposed within the second drill collar and a piston cylinder disposed within the piston cylinder. The piston cylinder is provided with a drain hole. The piston cylinder and the piston cylinder define a first hydraulic chamber and a second hydraulic chamber that communicate with the drive mechanism. The drive mechanism is configured to inject hydraulic fluid into the first hydraulic chamber or the second hydraulic chamber, such that the piston cylinder can move in the axial direction so that the drain hole can coincide with or be offset from the bypass hole in the axial direction.

[0009] Furthermore, a raft plate is provided at the lower end of the piston cylinder. The raft plate is configured to engage with the piston cylinder when the drain hole and the bypass hole coincide in the axial direction, so that the plugging fluid in the flow channel can only enter the annulus through the drain hole and the bypass hole, thereby putting the conveying mechanism in a plugging state.

[0010] Furthermore, a piston sleeve is provided at the upper end of the piston cylinder. The piston cylinder, the piston sleeve, and the piston cylinder together define the first hydraulic chamber, so that the piston cylinder can move to engage with the raft plate under the action of the hydraulic fluid in the first hydraulic chamber.

[0011] Furthermore, the lower end of the piston cylinder is provided with a protrusion for defining the second hydraulic chamber with the piston cylinder, so that the piston cylinder can separate from the raft plate under the action of the hydraulic fluid in the second hydraulic chamber, so that the drain hole is offset from the bypass hole in the axial direction, thereby putting the conveying mechanism in a cyclic state.

[0012] Furthermore, the signal transmission component is electrically connected to the drive mechanism, and the signal transmission component is configured to enable the drive mechanism to inject hydraulic fluid into the first hydraulic chamber or the second hydraulic chamber after receiving a signal.

[0013] Furthermore, the drive mechanism includes a motor assembly electrically connected to the signal transmission component, and an oil pump connected to the motor assembly. The oil pump connects the first hydraulic chamber and the second hydraulic chamber, and is configured to pump hydraulic fluid in the first hydraulic chamber to the second hydraulic chamber, or pump hydraulic fluid in the second hydraulic chamber to the first hydraulic chamber, under the drive of the motor assembly.

[0014] Furthermore, the oil pump connects the first hydraulic chamber and the second hydraulic chamber via a cylinder assembly. The cylinder assembly includes a body and a control valve within the body that connects the oil pump, the first hydraulic chamber, and the second hydraulic chamber. The control valve is configured to disconnect the connection between the first hydraulic chamber and the second hydraulic chamber when the motor assembly stops driving the oil pump.

[0015] Furthermore, the control valve includes a valve seat, a first valve core and a second valve core disposed within the valve seat, and an adjusting piston disposed between the first valve core and the second valve core. The adjusting piston is configured to allow the oil pump to connect to the second hydraulic chamber through the second valve core when the oil pump injects hydraulic fluid into the first hydraulic chamber, so that fluid in the second hydraulic chamber can flow into the oil pump; or to allow the first valve core of the oil pump to connect to the first hydraulic chamber when the oil pump injects hydraulic fluid into the second hydraulic chamber, so that fluid in the first hydraulic chamber can flow into the oil pump.

[0016] Furthermore, the regulating piston is also configured to cause the first valve spool to disconnect the oil pump and the first hydraulic chamber when the motor assembly stops driving the oil pump, and to cause the second valve spool to disconnect the oil pump and the second hydraulic chamber.

[0017] The beneficial effects of this utility model are as follows: This utility model provides a drilling-while-operating (DWI) plugging and circulation device, including a conveying mechanism for conveying plugging fluid and a driving mechanism. The conveying mechanism includes a signal transmission component disposed in a first drill collar and a switching component disposed in a second drill collar. The second drill collar is provided with a bypass hole for connecting the flow channel in the conveying mechanism and the annulus between the DWI plugging and circulation device and the wellbore. The driving mechanism is configured to open or close the bypass hole using hydraulic pressure after the signal transmission component receives a signal, thereby switching the conveying mechanism between plugging and circulation states. This allows for the transmission of wireless signals from the wellhead to the downhole to control the driving mechanism, which in turn drives the switching component of the conveying mechanism to open or close the bypass hole, thus enabling an unlimited number of plugging operations. Furthermore, the DWI plugging and circulation device eliminates the need for a ball seat for ball-dropping and pressure buildup, ensuring a larger flow diameter. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 The image shown is a cross-sectional view of the conveying mechanism of a drilling plugging circulation device when it is in the plugging state.

[0020] Figure 2 As shown Figure 1 An enlarged view of a partial structure of the conveying mechanism shown.

[0021] Figure 3 As shown Figure 1 Another enlarged view of the conveyor mechanism in a cyclic state.

[0022] Figure 4 As shown Figure 1 Another enlarged view of the conveying structure shown when it is in a leak-proof state.

[0023] Figure 5 The diagram shows a schematic of the drive mechanism of a drilling plugging circulation device.

[0024] Figure 6 As shown Figure 5 The diagram shows a cross-sectional view of the motor assembly of the drive mechanism.

[0025] Figure 7 As shown Figure 5 A partial structural cross-sectional view of the oil pump of the drive mechanism shown.

[0026] Figure 8 As shown Figure 5 The structural cross-sectional view of the connecting component of the drive mechanism shown.

[0027] Figure 9 As shown Figure 5 The hydraulic cylinder assembly of the drive mechanism shown is a structural cross-sectional view from one perspective.

[0028] Figure 10 As shown Figure 5 The hydraulic cylinder assembly of the drive mechanism shown is viewed from another perspective in a structural cross-sectional view.

[0029] In the figure, the following reference numerals are used: 10, conveying mechanism; 20, driving mechanism; 30, flow channel.

[0030] 11. First connector; 12. Second connector; 13. First drill collar; 14. Second drill collar; 141. Bypass hole;

[0031] 15. Signal transmission assembly; 151. Isolation sleeve; 152. First antenna frame; 153. Second antenna frame; 154. Protective sleeve; 155. Coil; 156. Support sleeve; 157. Balance piston; 158. Spring; 159. Electronic compartment; 1591. Buffer sleeve;

[0032] 16. Switch assembly; 161. Piston cylinder; 1611. Protrusion; 162. Piston sleeve; 163. Piston barrel; 1631. Drain hole; 164. First hydraulic chamber; 165. Second hydraulic chamber; 166. Nozzle; 17. Valves; 18. Upper retaining sleeve;

[0033] 21. Motor assembly; 211. Motor; 212. Tailstock; 2121. Wire guide hole;

[0034] 22. Oil pump; 221. Pump shaft; 222. First delivery port; 223. Second delivery port; 224. Connecting part; 225. Connecting component; 226. Coupling; 227. Bearing;

[0035] 23. Hydraulic cylinder assembly; 231. Main body; 2311. Connecting hole; 2312. First channel; 2313. Second channel; 2314. Third channel; 232. First nozzle; 233. Second nozzle; 234. Control valve; 2341. Valve seat; 2342. First valve core; 2343. Second valve core; 2344. Adjusting piston; 2345. First connecting hole; 2346. Second connecting hole; 24. Filter element. Detailed Implementation

[0036] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic structure of the present utility model in a schematic manner; therefore, it only shows the components relevant to the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] refer to Figure 1 and Figure 5 As shown, the present invention provides a drilling plugging and circulation device including a conveying mechanism 10 for conveying plugging fluid and a drive mechanism 20 for switching the conveying mechanism 10 between a plugging state and a circulation state. The conveying mechanism 10 includes a first connector 11 for the upper tubing string, a second connector 12 for connecting the lower tubing string, and a first drill collar 13 and a second drill collar 14 disposed between the first connector 11 and the second connector 12. The conveying mechanism 10 also includes a signal transmission component 15 and a switching component 16 disposed within the first drill collar 13 and the second drill collar 14. A bypass hole 141 is provided on the second drill collar 14 for connecting the flow channel 30 inside the drilling plugging and circulation device and the annulus between the drilling plugging and circulation device and the wellbore. The drive mechanism 20 is configured to open or close the bypass hole 141 by hydraulic pressure, thereby enabling the conveying mechanism 10 to switch between a plugging state and a circulation state. This eliminates the need for a ball seat in the drilling plugging circulation device, and also eliminates the need to control the opening and closing of the bypass hole 141 by dropping balls at the wellhead. This ensures that the drilling plugging circulation device has a large diameter and can complete an unlimited number of plugging operations.

[0038] Combination Figure 1 and Figure 2 As shown, in some embodiments, the signal transmission component 15 of the conveying mechanism 10 includes an isolation sleeve 151 coaxially arranged within the first drill collar 13, a first antenna frame 152 disposed between the first drill collar 13 and the isolation sleeve 151, and a second antenna frame 153 disposed at the upper end of the isolation sleeve 151. A protective sleeve 154 is also disposed between the first antenna frame 152 and the isolation sleeve 151 to further separate the first antenna frame 152 from the leak-blocking fluid in the flow channel 30. Preferably, the protective sleeve 154 is made of ceramic material, and the isolation sleeve 151 is made of polymer material, such as polyetheretherketone (PEEK).

[0039] In some embodiments, a coil 155 is wound around the first antenna frame 152 to serve as a loop antenna for the RFID tag. RFID tags are well known to those skilled in the art and will not be described in detail herein.

[0040] In some preferred embodiments, the first drill collar 13 is also provided with an oil injection hole (not shown) for injecting hydraulic oil between the first drill collar 13 and the isolation sleeve 151, so that the first antenna frame 152 and its electronic components are immersed in the hydraulic oil. This allows the hydraulic oil to balance the fluid pressure in the flow channel 30, preventing the first antenna frame 152 and its electronic components from being subjected to pressure in the radial direction. More preferably, the portion of the first connector 11 located inside the first drill collar 13 abuts against the support sleeve 156. A balance piston 157 and a spring 158 abutting against the balance piston 157 and the support sleeve 156 are provided between the support sleeve 156 and the second antenna frame 153. The balance piston 157 and the spring 158 can balance the pressure of the hydraulic oil between the first drill collar 13 and the isolation sleeve 151 to protect the second antenna frame 153 and its electronic components.

[0041] Combination Figure 1 As shown, in some embodiments, the signal transmission assembly 15 further includes an electronic compartment 159 located within the second drill collar 14, for housing modules such as a power module, a signal processing module, and a control module. The electronic compartment 159 is electrically connected to electronic components on the first antenna frame 152 and the second antenna frame 153, as well as the drive mechanism 20. The signal processing module of the electronic compartment 159 processes the signal received from the wellhead by the loop antenna and then sends commands to the control module to cause the drive mechanism 20 to perform corresponding driving actions.

[0042] In some preferred embodiments, a buffer sleeve 1591 is provided between the electronic compartment 159 and the isolation sleeve 151 and the first antenna frame 152 to prevent collisions between the electronic compartment 159 and the isolation sleeve 151 and the first antenna frame 152 due to column vibration. The buffer sleeve 1591 can be made of flexible silicone or rubber material.

[0043] More preferably, sealing rings are provided between the support sleeve 156 and the balance piston 157 and the first drill collar 13, between the first antenna frame 152 and the first drill collar 13, between the electronic compartment 159 and the buffer sleeve 1591, and between the electronic compartment 159 and the second drill collar 14, to ensure the sealing of the inside of the conveying mechanism 10.

[0044] refer to Figure 1 , Figure 3 and Figure 4As shown, in some embodiments, the switching assembly 16 of the conveying mechanism 10 includes a piston cylinder 161 coaxially arranged within the second drill collar 14, a piston sleeve 162 disposed on the upper part of the piston cylinder 161 and abutting against the electronic compartment 159, and a piston cylinder 163 disposed between the piston cylinder 161 and the piston sleeve 162. The upper end of the piston cylinder 163 defines a first hydraulic chamber 164 between the piston sleeve 162 and the piston cylinder 161, and the lower end of the piston cylinder 163 defines a second hydraulic chamber 165 between the piston cylinder 161 and the piston cylinder 163. Both the first hydraulic chamber 164 and the second hydraulic chamber 165 are connected to the drive mechanism 20, so that the drive mechanism 20 injects hydraulic fluid into the first hydraulic chamber 164 or the second hydraulic chamber 165 to move the piston cylinder 163 axially, thereby allowing the drain hole 1631 on the piston cylinder 163 to coincide with or be offset from the bypass hole 141 on the second drill collar 14 in the axial direction. Preferably, a nozzle 166 is provided in the bypass hole 141, which penetrates the piston cylinder 161 in the radial direction, to prevent the piston cylinder 161 and the second drill collar 14 from being worn by the leaking fluid when the conveying mechanism 10 is in a leak-proof state.

[0045] Combination Figure 3 and Figure 4 As shown, in some embodiments, the lower end of the piston cylinder 161 is provided with a protrusion 1611 extending radially inward, for sliding sealing engagement with the outer wall of the piston cylinder 163. The protrusion 1611 and the stepped surface on the piston cylinder 163 together define a second hydraulic chamber 165 between the outer wall of the piston cylinder 163 and the inner wall of the piston cylinder 161. More preferably, a circumferential limiting structure is provided between the inner wall of the piston cylinder 161 and the outer wall of the piston cylinder 163, so that the piston cylinder 161 can circumferentially limit the piston cylinder 163, preventing the piston cylinder 163 from rotating during axial movement, thereby ensuring that the drain hole 1631 can only coincide with or be offset from the bypass hole 141 in the axial direction. The circumferential limiting structure can be a spline.

[0046] In some embodiments, a raft plate 17 located within the flow channel 30 is further disposed below the piston cylinder 161 for engaging the lower end of the piston cylinder 163 when the conveying mechanism 10 is in a leak-proof state. An upper retaining sleeve 18 is disposed between the raft plate 17 and the piston cylinder 161 so that the piston cylinder 163 can engage with the raft plate 17 only after moving a certain distance in the axially downward direction.

[0047] Combination Figure 3 As shown, the conveying mechanism 10 is in a circulating state. At this time, the drain hole 1631 of the piston cylinder 163 is misaligned with the bypass hole 141 of the second drill collar 14, so that the bypass hole 141 is closed by the piston cylinder 163. The plugging fluid in the flow channel 30 can flow from the lower end of the piston cylinder 163 through the upper sleeve 18 and the raft plate 17, and then flow from the second connector 12 into the tubing below the conveying mechanism 10.

[0048] When the drive mechanism 20 injects hydraulic fluid into the first hydraulic chamber 164, the hydraulic fluid in the first hydraulic chamber 164 pushes the piston cylinder 163 to move axially downward until the lower end of the piston cylinder 163 engages with the raft plate 17. Figure 4 As shown, the delivery mechanism 10 is in a plugging state. At this time, the drain hole 1631 of the piston cylinder 163 coincides axially with the bypass hole 141 of the second drill collar 14. The plugging fluid in the flow channel 30 can only flow into the annulus between the drilling plugging circulation device and the wellbore from the drain hole 1631 and the bypass hole 141. The plugging material mixed in the plugging fluid can then enter and seal the formation fractures to facilitate subsequent fracturing operations.

[0049] When the drive mechanism 20 injects hydraulic fluid into the second hydraulic chamber 165, the hydraulic fluid in the second hydraulic chamber 165 pushes the piston cylinder 163 to move axially upward until the piston cylinder 163 returns to its original position. Figure 3 As shown, the conveying mechanism 10 is now back in a cyclic state.

[0050] refer to Figure 5 As shown, in some embodiments, the drive mechanism 20 includes a motor assembly 21, an oil pump 22 connected to the motor assembly 21, and a cylinder assembly 23 connected to the oil pump 22. The oil pump 22 is a bidirectional pump, capable of changing its pumping direction via the motor assembly 21. The cylinder assembly 23 is configured to disconnect the connection between the oil pump 22 and the switch assembly 16 when the oil pump 22 stops pumping.

[0051] Combination Figure 6 As shown, in some embodiments, the motor assembly 21 includes a motor 211 and a tailstock 212 disposed on the motor 211. Specifically, the tailstock 212 is mounted at the end away from the output shaft of the motor 211. The tailstock 212 is provided with a wire hole 2121 for electrically connecting the power cable and / or data cable of the motor 211 to pass through. The motor 211 is electrically connected to the electronics compartment 159 via the power cable and / or data cable so that the control module of the electronics compartment 159 can control the speed, direction of rotation, and angle of rotation of the output shaft of the motor 211.

[0052] refer to Figure 7 As shown, in some embodiments, the oil pump 22 includes a pump shaft 221 connected to the output shaft of the motor 211, and a first inlet 222 and a second inlet 223 for conveying hydraulic fluid. Since the oil pump 22 is a bidirectional pump, the rotation direction of the pump shaft 221 can be adjusted by changing the rotation direction of the output shaft of the motor 211, thereby adjusting the pumping direction of the oil pump 22. In some embodiments, the oil pump 22 can be a bidirectional vane pump or a bidirectional gear pump. The structure of the oil pump 22 for pumping fluid is well known to those skilled in the art and will not be described in detail in this application.

[0053] In some preferred embodiments, the oil pump 22 is further provided with a connecting portion 224 for connecting the cylinder assembly 23. A first delivery port 222 and a second delivery port 223 are both provided on the connecting portion 224 so that the first delivery port 222 and the second delivery port 223 communicate with a channel within the cylinder assembly 23 when the oil pump 22 is connected to the cylinder assembly 23 via the connecting portion 224. Specifically, the first delivery port 222 is located on the side wall of the connecting portion 224, and the second delivery port 223 is located at the end of the connecting portion 224. A plurality of sealing rings are also provided on the connecting portion 224 to enhance the sealing performance when the oil pump 22 and the cylinder assembly 23 are connected, preventing hydraulic fluid leakage between the oil pump 22 and the cylinder assembly 23.

[0054] Combination Figure 8 As shown, in some preferred embodiments, a connector 225 for connecting the motor assembly 211 and the oil pump 22, and a coupling 226 disposed within the connector 225, are further provided between the motor assembly 21 and the oil pump 22. The connector 225 is generally cylindrical in shape and is used to connect the housing of the motor 211 and the housing of the oil pump 22. The coupling 226 is used to connect the output shaft of the motor 211 and the pump shaft 221 of the oil pump 22 to improve the reliability of torque transmission between the output shaft of the motor 211 and the pump shaft 221. Specifically, a bearing 227 is provided between the coupling 226 and the connector 225 so that the coupling 226 can rotate relative to the connector 225.

[0055] refer to Figure 9 and Figure 10 As shown, in some embodiments, the cylinder assembly 23 includes a body 231, a first nozzle 232 and a second nozzle 233 disposed on the body 231, and a control valve 234 communicating with the first nozzle 232 and the second nozzle 233 within the body 231. The first nozzle 232 and the second nozzle 233 are respectively connected to the first hydraulic chamber 164 and the second hydraulic chamber 165 of the switch assembly 16. When hydraulic fluid is injected into the first hydraulic chamber 164 by the first nozzle 232, hydraulic fluid in the second hydraulic chamber 165 enters the cylinder assembly 23 through the second nozzle 233. Similarly, when hydraulic fluid is injected into the second hydraulic chamber 165 by the second nozzle 233, hydraulic fluid in the first hydraulic chamber 164 enters the cylinder assembly 23 through the first nozzle 232.

[0056] The first nozzle 232 is connected to the first delivery port 222 via the control valve 234, and the second nozzle 233 is connected to the second delivery port 223 via the control valve 234. When the hydraulic fluid output from the first delivery port 222 flows to the first hydraulic chamber 164 through the control valve 234 and the first nozzle 232, the control valve 234 allows the fluid in the second hydraulic chamber 165 to flow from the second nozzle 233 to the second delivery port 223. When the hydraulic fluid output from the second delivery port 223 flows to the second hydraulic chamber 165 through the control valve 234 and the second nozzle 233, the control valve 234 allows the hydraulic fluid in the first hydraulic chamber 164 to flow from the first nozzle 232 to the first delivery port 222. This allows the delivery mechanism 10 to switch between a leak-proof state and a circulation state.

[0057] Furthermore, the control valve 234 is configured to close the first delivery port 222 and the second delivery port 223 when the oil pump 22 stops pumping fluid, so that the hydraulic fluid in the switching assembly 16 cannot enter the oil pump 22 through the first delivery port 222 and / or the second delivery port 223, thereby ensuring that the delivery mechanism 10 is reliably in a plugged or circulating state.

[0058] Combination Figure 9 and Figure 10 As shown, in some embodiments, one end of the main body 231 is provided with a connection hole 2311 for connecting the connection portion 224 of the oil pump 22. Several channels are provided inside the main body 231 for connecting the first nozzle 232, the second nozzle 233, and the control valve 234. These channels include a first channel 2312 for connecting the first delivery port 222, a second channel 2313 for connecting the second delivery port 223, and a third channel 2314 for connecting the second nozzle 233.

[0059] In some embodiments, the control valve 234 includes a valve seat 2341, a first valve core 2342 and a second valve core 2343 disposed within the valve seat 2341, and an adjusting piston 2344 disposed between the first valve core 2342 and the second valve core 2343. The first end of the valve seat 2341 is directly connected to the first nozzle 232, while the second end of the valve seat 2341 is connected to the second nozzle 233 via a third channel 2314. Furthermore, the valve seat 2341 is also provided with a first connecting hole 2345 and a second connecting hole 2346. The first valve core 2342 allows the first connecting hole 2345 to connect the first channel 2312 and the first end of the valve seat 2341, so that the first nozzle 232 can connect to the first delivery port 222. The second valve core 2343 allows the second connecting hole 2346 to connect the second channel 2313 and the third channel 2314, so that the second nozzle 233 can connect to the second delivery port 223.

[0060] In some embodiments, when the first nozzle 232 injects hydraulic fluid into the first hydraulic chamber 164, the hydraulic fluid passing through the first valve core 2342 pushes the adjusting piston 2344 to move towards the second valve core 2343, until the second valve core 2343 connects the second channel 2313 and the third channel 2314. At this time, the hydraulic fluid in the second hydraulic chamber 165 enters the second delivery port 223 of the oil pump 22 through the second nozzle 233, the third channel 2314, the second valve core 2343, and the second channel 2313.

[0061] When the second nozzle 233 injects fluid into the second hydraulic chamber 165, the hydraulic fluid passing through the second valve core 2343 pushes the adjusting piston 2344 towards the first valve core 2342 until the first valve core 2342 connects the first end of the first channel 2312 and the valve seat 2341. At this time, the hydraulic fluid in the first hydraulic chamber 164 enters the first delivery port 222 of the oil pump 22 through the first nozzle 232, the first valve core 2342, and the first channel 2312.

[0062] When neither the first nozzle 232 nor the second nozzle 233 supplies hydraulic fluid to the switching assembly 16, the adjusting piston 2344 cannot move toward either the first valve core 2342 or the second valve core 2343. At this time, the first valve core 2342 cuts off the connection between the first nozzle 232 and the first delivery port 222, and the second valve core 2343 cuts off the connection between the second nozzle 233 and the second delivery port 223. Therefore, the hydraulic fluid in the switching assembly 16 cannot flow into the oil pump 22 through the cylinder assembly 23, thus ensuring that the delivery mechanism 10 can reliably operate in a plugged or circulating state.

[0063] In some preferred embodiments, the second ends of the first nozzle 232, the second nozzle 233, and the valve seat 2341 are all provided with filter elements 24 for filtering impurities in the hydraulic fluid.

[0064] It should be noted that the conveying mechanism 10 and the drive mechanism 20 of the leak-proof circulation device are both mounted on the tubing string. The connection structure and specific arrangement of the conveying mechanism 10 and the drive mechanism 20 can be configured by those skilled in the art as needed. This will not be elaborated further in this application.

[0065] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0067] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A circulating device for plugging leaks while drilling, characterized in that, include, The conveying mechanism (10) is used to convey plugging fluid. The conveying mechanism (10) includes a signal transmission component (15) disposed in the first drill collar (13) and a switch component (16) disposed in the second drill collar (14). The second drill collar (14) is provided with a bypass hole (141) for connecting the flow channel (30) in the conveying mechanism (10) and the annulus between the plugging circulation device and the well wall. as well as Drive mechanism (20); The drive mechanism (20) is configured to open or close the bypass hole (141) by hydraulic pressure after the signal transmission component (15) receives a signal, so that the delivery mechanism (10) can switch between a plugging state and a circulation state.

2. The drilling plugging and circulation device according to claim 1, characterized in that, The switching assembly (16) includes a piston cylinder (161) disposed within the second drill collar (14) and a piston cylinder (163) disposed within the piston cylinder (161). The piston cylinder (163) is provided with a drain hole (1631). The piston cylinder (161) and the piston cylinder (163) define a first hydraulic chamber (164) and a second hydraulic chamber (165) communicating with the drive mechanism (20). The drive mechanism (20) is configured to inject hydraulic fluid into the first hydraulic chamber (164) or the second hydraulic chamber (165) so that the piston cylinder (163) can move in the axial direction so that the drain hole (1631) can coincide with or be offset from the bypass hole (141) in the axial direction.

3. The drilling plugging and circulation device according to claim 2, characterized in that, The lower end of the piston cylinder (161) is provided with a raft plate (17), which is configured to engage with the piston cylinder (163) when the drain hole (1631) and the bypass hole (141) coincide in the axial direction, so that the plugging fluid in the flow channel (30) can only enter the annulus through the drain hole (1631) and the bypass hole (141), thereby putting the conveying mechanism (10) in a plugging state.

4. The drilling plugging and circulation device according to claim 3, characterized in that, The piston cylinder (161) is provided with a piston sleeve (162) at its upper end. The piston cylinder (161), the piston sleeve (162) and the piston cylinder (163) together define the first hydraulic chamber (164) so ​​that the piston cylinder (163) can move to engage with the raft plate (17) under the action of the hydraulic fluid in the first hydraulic chamber (164).

5. The drilling plugging and circulation device according to claim 3, characterized in that, The lower end of the piston cylinder (161) is provided with a protrusion (1611) for defining the second hydraulic chamber (165) with the piston cylinder (163), so that the piston cylinder (163) can be separated from the raft plate (17) under the action of the hydraulic fluid in the second hydraulic chamber (165), so that the drain hole (1631) is offset from the bypass hole (141) in the axial direction, thereby putting the conveying mechanism (10) in a circulating state.

6. The drilling plugging circulation device according to claim 2, characterized in that, The signal transmission component (15) is electrically connected to the drive mechanism (20), and the signal transmission component (15) is configured to enable the drive mechanism (20) to inject hydraulic fluid into the first hydraulic chamber (164) or the second hydraulic chamber (165) after receiving a signal.

7. The drilling plugging and circulation device according to any one of claims 2-6, characterized in that, The drive mechanism (20) includes a motor assembly (21) electrically connected to the signal transmission component (15) and an oil pump (22) connected to the motor assembly (21). The oil pump (22) connects the first hydraulic chamber (164) and the second hydraulic chamber (165). The oil pump (22) is configured to pump hydraulic fluid in the first hydraulic chamber (164) to the second hydraulic chamber (165) or pump hydraulic fluid in the second hydraulic chamber (165) to the first hydraulic chamber (164) under the drive of the motor assembly (21).

8. The drilling plugging and circulation device according to claim 7, characterized in that, The oil pump (22) is connected to the first hydraulic chamber (164) and the second hydraulic chamber (165) via a cylinder assembly (23). The cylinder assembly (23) includes a body (231) and a control valve (234) within the body (231) that connects the oil pump (22), the first hydraulic chamber (164), and the second hydraulic chamber (165). The control valve (234) is configured to disconnect the connection between the first hydraulic chamber (164) and the second hydraulic chamber (165) when the motor assembly (21) stops driving the oil pump (22).

9. The drilling plugging and circulation device according to claim 8, characterized in that, The control valve (234) includes a valve seat (2341), a first valve core (2342) and a second valve core (2343) disposed in the valve seat (2341), and an adjusting piston (2344) disposed between the first valve core (2342) and the second valve core (2343). The adjusting piston (2344) is configured to enable the oil pump (22) to connect to the second hydraulic chamber (165) through the second valve core (2343) when the oil pump (22) injects hydraulic fluid into the first hydraulic chamber (164), so that the fluid in the second hydraulic chamber (165) can flow into the oil pump (22), or to enable the oil pump (22) to connect to the first hydraulic chamber (164) through the first valve core (2342) when the oil pump (22) injects hydraulic fluid into the second hydraulic chamber (165), so that the fluid in the first hydraulic chamber (164) can flow into the oil pump (22).

10. The drilling plugging and circulation device according to claim 9, characterized in that, The regulating piston (2344) is also configured to cause the first valve core (2342) to disconnect the oil pump (22) from the first hydraulic chamber (164) when the motor assembly (21) stops driving the oil pump (22), and to cause the second valve core (2343) to disconnect the oil pump (22) from the second hydraulic chamber (165).

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