Downhole bypass valve capable of being activated infinitely through displacement control

Abstract

The invention discloses a displacement control infinite activation downhole bypass valve which comprises an upper connector, an upper piston, a central pipe, a middle connector, a lower piston and a lower connector. The upper joint and the lower joint are respectively provided with an upper bypass hole and a lower bypass hole; an inner step is arranged in the middle connector, and a connector overflowing hole is formed in the inner step. The upper connector, the middle connector and the lower connector are sequentially connected. The upper end of the central tube is mounted in the lower end of the upper piston; the upper piston is mounted in the upper joint; the lower end of the central pipe is mounted in the lower joint; a limiting rail is arranged on the outer wall of the upper piston; a pin matched with the limiting rail for limiting is arranged on the upper joint; an upper spring, a lower piston and a lower spring sequentially sleeve the lower end of the central pipe; the lower end of the lower spring is connected to the bottom end of the center pipe in an abutting mode, and the upper end of the lower spring abuts against the lower end face of the inner step. The bypass function can be activated only by changing the displacement without pitching, and activation can be carried out for infinite times.

Description

Technical Field

[0001] This invention relates to a downhole bypass valve with unlimited activation for displacement control, belonging to the field of oil drilling technology. Background Technology

[0002] During drilling, lost circulation is a common occurrence. To reduce tripping time, a common solution is to add a bypass valve to the drill string assembly for plugging the leakage without tripping. The bypass valve is typically installed on the upper part of specialized drill string assemblies such as directional drilling, speed-up drilling, and measurement-while-drilling (MWD) systems. It can be opened and closed promptly according to downhole tools, increasing the applicability of specialized drill string assemblies, improving production efficiency, and reducing well control risks.

[0003] Currently, the most commonly used bypass valve in the field is the ball-drop method, which involves dropping a ball from the surface to activate the bypass valve for opening and closing operations. This operation is time-consuming, especially at deeper wells where it takes even longer for the ball to reach the bypass valve. Furthermore, the size of the ball basket is limited by the internal space of the drill string, thus restricting the number of ball drops. More importantly, with the development of highly deviated and horizontal wells, the gravity-based ball-drop method is no longer suitable for highly deviated or horizontal well sections. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a flow rate control for unlimited activation of a downhole bypass valve.

[0005] The technical solution provided by this invention to solve the above-mentioned technical problems is: a discharge control infinitely activated downhole bypass valve, comprising an upper connector, an upper piston, a central tube, an intermediate connector, a lower piston, and a lower connector;

[0006] The upper connector and the lower connector are respectively provided with an upper bypass hole and a lower bypass hole in the radial direction; the intermediate connector has an inner step, and a connector flow hole is provided axially on the inner step;

[0007] The upper connector, intermediate connector, and lower connector are connected in sequence; the upper end of the central tube is installed inside the lower end of the upper piston; the upper piston is installed inside the upper connector, and the lower end of the central tube is installed inside the lower connector.

[0008] The upper piston has a limiting track on its outer wall, and the upper connector has a pin that cooperates with the limiting track for limiting.

[0009] An upper spring, a lower piston, and a lower spring are sequentially fitted onto the lower end of the central tube. The two ends of the upper spring are respectively connected to the upper piston and the upper end face of the inner step. The lower end of the lower spring is connected to the bottom end of the central tube, and the upper end pushes the lower piston to the lower end face of the inner step.

[0010] A further technical solution is that the upper piston has a manifold cavity, a central flow cavity, a drilling channel, a plugging channel, and a slot communicating with the drilling channel, wherein the drilling channel, the manifold cavity, and the central flow cavity are connected in sequence; the upper connector has a diversion cavity, wherein the diversion cavity is connected with the slot.

[0011] A further technical solution is that the gap between the upper connector, the intermediate connector and the central tube is an upper spring cavity, and the upper spring cavity is connected to the connector flow hole; the gap between the lower connector and the central tube is a lower spring cavity, and the lower bypass hole is connected to the lower spring cavity.

[0012] A further technical solution is to fill the upper spring cavity with hydraulic oil.

[0013] A further technical solution is that the central tube is provided with an anti-rotation ring located in the upper spring cavity.

[0014] A further technical solution is that the outer wall of the central tube is provided with an anti-rotation protrusion, and the inner wall of the upper piston is provided with a groove that cooperates with the anti-rotation protrusion.

[0015] A further technical solution is that sealing rings are provided between the upper piston and the upper connector, and between the central tube and the upper piston.

[0016] A further technical solution is that the upper piston is provided with a piston cap at its upper end.

[0017] The present invention has the following beneficial effects: The present invention does not require throwing; it only requires changing the displacement to activate the bypass function, which can be activated an unlimited number of times. Attached Figure Description

[0018] Figure 1 A three-dimensional schematic diagram of the discharge control activating the downhole bypass valve AA an infinite number of times in the initial state;

[0019] Figure 2 A three-dimensional schematic diagram of the discharge control activating the downhole bypass valve BB an infinite number of times in the initial state;

[0020] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0021] Figure 4 A three-dimensional schematic diagram of the downhole bypass valve AA being activated an unlimited number of times by the discharge control when the well is in the plugging state;

[0022] Figure 5 A three-dimensional schematic diagram of the downhole bypass valve AA being activated an unlimited number of times by the discharge control when the well is in the plugging state;

[0023] Figure 6 for Figure 4 A magnified view of a portion of the image;

[0024] Figure 7 This is a schematic diagram of the limiting track structure. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, 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 also refer to a mechanical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figures 1-7 As shown, the present invention provides a displacement control for unlimited activation of a downhole bypass valve, comprising an upper connector 1, an upper piston 3, a central tube 4, an intermediate connector 6, a lower piston 7, and a lower connector 8;

[0030] The upper connector 1 and the lower connector 8 are respectively provided with an upper bypass hole 9 and a lower bypass hole 19 in the radial direction; the intermediate connector 6 has an inner step, and a connector flow hole 14 is provided axially on the inner step;

[0031] The upper connector 1, the middle connector 6, and the lower connector 8 are connected in sequence; the upper end of the central tube 4 is installed inside the lower end of the upper piston 3; the upper piston 3 is installed inside the upper connector 1, and the lower end of the central tube 4 is installed inside the lower connector 8.

[0032] The upper piston 3 has a limiting track on its outer wall, and the upper connector 1 has a pin 10 that cooperates with the limiting track for limiting.

[0033] The lower end of the central tube 4 is sequentially fitted with an upper spring 9, a lower piston 7, and a lower spring 10.

[0034] The upper spring 9 is connected to the upper piston 3 and the upper end face of the inner step at both ends respectively. The lower end of the lower spring 10 is connected to the bottom end of the central tube 4 at the bottom end. The upper end pushes the lower piston 7 to the lower end face of the inner step and seals the flow hole 14 of the connector.

[0035] In this embodiment, the upper piston 3 has a manifold 12, a central flow chamber 13, a drilling channel 15, a plugging channel 16, and a slot communicating with the drilling channel 15. The drilling channel 15, the manifold 12, and the central flow chamber 13 are connected in sequence. The upper connector 1 has an inlet channel, a diversion chamber 11, and an installation cavity connected in sequence from top to bottom. The diversion chamber 11 is connected with the slot. The upper piston 3 is installed in the diversion chamber 11 and the installation cavity, and its upper end abuts against the end face of the inlet channel to seal the inlet channel.

[0036] In this embodiment, the gap between the upper connector 1, the intermediate connector 6 and the central tube 4 is the upper spring cavity 17, which is connected to the connector flow hole 14; the gap between the lower connector 8 and the central tube 4 is the lower spring cavity 18, which is connected to the lower bypass hole 19; and the upper spring cavity 17 is filled with hydraulic oil.

[0037] In this embodiment, to prevent the central tube 4 from rotating, a preferred implementation is that the central tube 4 is provided with an anti-rotation ring 5 located in the upper spring cavity 17, and the anti-rotation ring 5 is provided with a connecting hole axially communicating with the connector flow hole 14, so that the upper spring cavity 17, the connecting hole, and the connector flow hole 14 are connected.

[0038] In this embodiment, to prevent the upper piston 3 from rotating relative to the central tube 4, the outer wall of the central tube 4 is provided with an anti-rotation protrusion, and the inner wall of the upper piston 3 is provided with a groove that cooperates with the anti-rotation protrusion. When the upper piston 3 is pressed to a certain position in the central tube 4, the anti-rotation protrusion is located in the groove, which plays a limiting role and prevents the two from rotating relative to each other.

[0039] In this embodiment, in order to improve the sealing effect, a preferred implementation is that sealing rings are provided between the upper piston 3 and the upper connector 1, and between the central tube 4 and the upper piston 3.

[0040] In this embodiment, in order to facilitate pressing open the upper piston 3, a piston cover 2 is provided at the upper end of the upper piston 3, and the piston cover 2 is located in the liquid inlet channel.

[0041] In this embodiment, the structure of the limiting track is as follows: Figure 7As shown, the limiting track has an initial track P1, a flow track P2, a drilling track P3, a pump stop track P4, and a leak-sealing track P5; the pump stop track P4 is connected to the initial track P1, the drilling track P3, and the leak-sealing track P5 respectively, and the flow track P2 is connected to the initial track P1 and the drilling track P3 respectively.

[0042] When the pin is in the initial track P1, the device is in its initial state, specifically as follows: Figure 1 and Figure 2 As shown;

[0043] When drilling is required, the pump is turned on, the upper piston 3 moves downward, and at the same time the pin moves from the initial track P1 through the flow track P2 to the drilling track P3. The upper piston 3 moves downward to the limit point. At this time, the drilling fluid enters the diversion chamber 11 from the inlet channel of the upper connector 1, then enters the drilling channel 15 and then enters the confluence chamber 12, and then flows out into the central pipe 4.

[0044] At the same time, the lower piston 7 will also move down accordingly, and the hydraulic oil in the upper piston chamber 17 will enter the lower spring chamber 18 through the connector flow hole 14, pushing the lower piston 7 down, so that the lower spring chamber 18 will exchange fluid with the annulus through the lower bypass hole 19.

[0045] When the pump stops, the pin returns to the initial track P1 via the pump stop track P4. At this time, the upper piston 3 and the lower piston 7 return to their initial positions due to the action of the two springs.

[0046] When leak plugging is required, reduce the pumping rate during drilling. Once the pin reaches the pump stop track P4, increase the pumping rate again. The pin will then enter the leak plugging track P5. (Specific details are as follows...) Figure 3 and Figure 4 As shown; at this time, the drilling channel through which the drilling fluid flows is blocked, and the plugging channel 16 is connected to the upper bypass hole 9, entering the plugging state.

[0047] When the pump stops, the pin returns to the initial track P1 via the pump stop track P4. At this time, the upper piston 3 and the lower piston 7 return to their initial positions due to the action of the two springs.

[0048] The above description is not intended to limit the present invention in any way. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall fall within the scope of the present invention.

Claims

1. A displacement control system for unlimited activation of a downhole bypass valve, characterized in that, Includes upper connector (1), upper piston (3), central tube (4), intermediate connector (6), lower piston (7), and lower connector (8); The upper connector (1) and lower connector (8) are respectively provided with an upper bypass hole (9) and a lower bypass hole (19) in the radial direction; the intermediate connector (6) has an inner step, and the inner step is provided with a connector flow hole (14) in the axial direction; The upper connector (1), the middle connector (6), and the lower connector (8) are connected in sequence; the upper end of the central tube (4) is installed inside the lower end of the upper piston (3); the upper piston (3) is installed inside the upper connector (1), and the lower end of the central tube (4) is installed inside the lower connector (8); The upper piston (3) has a limiting track on its outer wall, and the upper connector (1) has a pin (10) that cooperates with the limiting track for limiting. The lower end of the central tube (4) is fitted with an upper spring (9), a lower piston (7), and a lower spring (10) in sequence. The two ends of the upper spring (9) are respectively connected to the upper piston (3) and the upper end face of the inner step. The lower end of the lower spring (10) is connected to the bottom end of the central tube (4), and the upper end pushes the lower piston (7) to the lower end face of the inner step.

2. The displacement control infinite activation downhole bypass valve according to claim 1, characterized in that, The upper piston (3) has a manifold (12), a central flow chamber (13), a drilling channel (15), a plugging channel (16), and a slot communicating with the drilling channel (15). The drilling channel (15), the manifold (12), and the central flow chamber (13) are connected in sequence. The upper connector (1) has a diversion chamber (11), which is connected with the slot.

3. The discharge control infinite activation downhole bypass valve according to claim 1, characterized in that, The gap between the upper connector (1), the intermediate connector (6) and the central tube (4) is the upper spring cavity (17), which is connected to the connector flow hole (14); the gap between the lower connector (8) and the central tube (4) is the lower spring cavity (18), which is connected to the lower bypass hole (19).

4. The discharge control infinite activation downhole bypass valve according to claim 3, characterized in that, The upper spring cavity (17) is filled with hydraulic oil.

5. The displacement control infinite activation downhole bypass valve according to claim 3, characterized in that, The central tube (4) is provided with an anti-rotation ring (5) located in the upper spring cavity (17).

6. The displacement control infinitely activated downhole bypass valve according to claim 1, characterized in that, The outer wall of the central tube (4) is provided with an anti-rotation protrusion, and the inner wall of the upper piston (3) is provided with a groove that cooperates with the anti-rotation protrusion.

7. The displacement control infinite activation downhole bypass valve according to claim 1, characterized in that, A sealing ring is provided between the upper piston (3) and the upper connector (1), and between the central tube (4) and the upper piston (3).

8. The displacement control infinite activation downhole bypass valve according to claim 1, characterized in that, The upper piston (3) is provided with a piston cap (2) at its upper end.

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