A flow pressure regulating device for a wellbore

Abstract

This invention relates to a flow pressure regulating device for drilling wellbore, comprising an isolation plate, a linkage assembly, a driven assembly, and an regulating assembly. The isolation plate has a through-cavity in its center, which seals and connects two adjacent drill pipes. The outer edge of the isolation plate, specifically the outer edge portion, seals the outer wall of the drill pipes via a sealing ring, thus preventing the formation of annulus between the drill pipes and the well wall. The isolation plate has a through-hole communicating with the annulus. During drilling, the flow of drilling fluid drives the linkage blades to rotate within the inner cavity. When the flow pressure in the annulus of a certain well section exceeds the safe range compared to the formation fluid pressure of the well section, the operator can remotely control the controller via a remote control device to rotate the linkage blades, thereby adjusting the inclination angle of the linkage blades. This device has the advantage of being able to regulate the flow pressure in the annulus of the wellbore.

Description

Technical Field

[0001] This invention relates to the field of energy extraction technology, and in particular to a flow pressure regulating device for drilling wellbore. Background Technology

[0002] The space between the drill pipe and the wellbore is called the annulus. During drilling, drilling fluid is pumped into the bottom of the well through the drill pipe and returns to the surface through the annulus. There are hydrostatic pressure and circulating flow pressure in the annulus, and the sum of the two is called the annulus pressure. The annulus flow pressure can increase the bottom hole pressure, which helps to inhibit the intrusion of formation fluids into the well, but it can also easily cause well leakage. Therefore, it needs to be maintained within a safe range.

[0003] Generally, drilling fluid of a certain density is used to provide sufficient annular pressure in the wellbore. However, due to the required drilling depth, it is often necessary to penetrate rock formations of different hardness or fracture structures. This necessitates timely adjustment of the annular flow pressure in well sections with different structural layers. Currently, there is a lack of a wellbore flow pressure regulating device, making it difficult to regulate the annular flow pressure in the corresponding well section and maintain the pressure difference between the annular flow pressure and the formation fluid pressure within the well section within a safe range. During drilling, if the annular pressure is much greater than the formation fluid pressure, well leakage will occur, affecting wellbore safety. Therefore, a wellbore flow pressure regulating device is urgently needed. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention provides a flow pressure regulating device for drilling wellbore, which has the advantage of being able to regulate the flow pressure in the wellbore annulus.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A flow pressure regulating device for drilling wellbore, the flow pressure regulating device comprising:

[0007] An isolation disc has an inner cavity extending through its center, which is used to seal and connect two adjacent drill pipes. The outer edge of the isolation disc is used to block the wellbore annulus formed by the drill pipe and the well wall. The isolation disc has a through hole communicating with the wellbore annulus.

[0008] The linkage assembly includes a linkage blade located inside the inner cavity and movably mounted on the isolation disc. The linkage blade rotates circumferentially along the drill pipe inside the inner cavity under the push of the drilling fluid.

[0009] A driven assembly, comprising a driven fan blade movably disposed within the through hole, the driven fan blade being driveably connected to a linkage blade, the linkage blade driving the driven fan blade to adjust the liquid flow rate within the through hole; and

[0010] An adjustment assembly includes a drive component and a controller. The drive component is connected to the linkage blade, and the linkage blade has an inclination angle in the drilling fluid flow direction of the drill pipe. The drive component drives the linkage blade to rotate to adjust the inclination angle. The controller is electrically connected to the drive component to control the drive component, and the controller is wirelessly connected to an external remote control device.

[0011] In one embodiment, the linkage assembly further includes a linkage rotating ring located inside the inner cavity, and the linkage rotating ring is rotatably and sealingly connected to the isolation disc;

[0012] The inner wall of the linkage rotating ring is provided with a mounting base, and the linkage blade is rotatably connected to the mounting base.

[0013] In one embodiment, the mounting base includes a turntable, and the linkage blade is rotatably connected to the mounting base via the turntable;

[0014] The driving component includes a hydraulic telescopic cylinder, the telescopic shaft of which is connected to the turntable via a transmission connection, and the telescopic action of the telescopic shaft pulls the turntable to rotate.

[0015] In one embodiment, the driven component further includes a driven rotating ring, which is rotatably connected to the isolation disk, and the inner wall of the driven rotating ring forms the through hole;

[0016] The driven fan blade is fixedly disposed inside the driven rotating ring, and the axial direction of the driven fan blade is the same as the rotation axis of the driven rotating ring.

[0017] In one embodiment, a first filter screen is provided at the bottom end of the inner wall of the driven rotating ring.

[0018] In one embodiment, a pressing roller is disposed below the first filter screen, and the pressing roller is fixedly connected to the driven rotating ring.

[0019] In one embodiment, the inner wall of the driven rotating ring is further provided with a second filter screen, the pores of the second filter screen being larger than those of the first filter screen, and the second filter screen being located between the driven fan blade and the first filter screen.

[0020] In one embodiment, the flow pressure regulating device further includes a transmission assembly, the transmission assembly comprising:

[0021] A first transmission gear ring, the first transmission gear ring being fixedly disposed outside the linkage rotating ring; and

[0022] The second transmission gear ring is fixedly disposed outside the driven rotating ring;

[0023] The first transmission gear ring meshes with the second transmission gear ring.

[0024] In one embodiment, multiple linkage blades are provided and are evenly distributed along the circumference of the linkage ring.

[0025] In one embodiment, when the tilt angle of the linkage blade is at the maximum value of the adjustment range, the blocking area formed by the projection of the linkage blade in the direction of drilling fluid flow is 3 / 4 of the drilling cross-sectional area.

[0026] The present invention has the following advantages due to the adoption of the above technical solutions:

[0027] 1. During drilling, drilling fluid is continuously pumped into the drill pipe. The flow of drilling fluid drives the linkage blades to rotate in the inner cavity. At this time, the linkage blades drive the driven fan blades to rotate in the through hole. The rotating fan blades regulate the flow rate of the return drilling fluid through the through hole. When the flow pressure in the annulus of a certain well section exceeds the safe range of the fluid pressure difference in the formation where the well section is located, in order to adjust the flow pressure, the operator can use the remote control device to remotely control the controller to drive the linkage blades to rotate, thereby adjusting the inclination angle of the linkage blades. This has the advantage of being able to regulate the flow pressure in the annulus of the well.

[0028] 2. In order to optimize the smoothness of the rotation of the linkage blades, multiple linkage blades are set, specifically 6, and they are evenly distributed along the circumference of the linkage ring. The number and position of the mounting base and adjustment components are set to correspond to each linkage blade.

[0029] 3. The first filter screen filters out rock cuttings in the fluid in the wellbore annulus, and the crushing roller crushes the rock cuttings trapped in the area of ​​the first filter screen. This allows for timely processing of new rock cuttings generated and flowing during drilling, which helps ensure the smooth flow of fluid in the wellbore annulus and makes the distribution of fluid and rock cuttings in the wellbore annulus uniform. This, in turn, helps to evenly distribute the pressure of the fluid in the wellbore annulus on the formation outside the wellbore, making the pressure generated during fluid circulation more uniform. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the specific structure of the flow pressure regulating device in one embodiment of the present invention;

[0031] Figure 2This is a schematic diagram of the installation position of the flow pressure regulating device in one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the flow pressure regulating device in one embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the specific structure of the adjustment component in one embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the specific structure of the driven component in one embodiment of the present invention;

[0035] The markings in the diagram are as follows:

[0036] 1. Wellbore annulus; 2. Drill pipe; 3. Outer edge; 4. I-shaped connector; 5. Isolation disc; 6. Sealing ring; 7. Linkage rotating ring; 8. First transmission gear ring; 9. Linkage assembly; 10. Through hole; 11. Driven rotating ring; 12. Second transmission gear ring; 13. Driven assembly; 14. Adjustment assembly; 15. Drive component; 16. First connecting rod; 17. Telescopic shaft; 18. Mounting base; 19. Turntable; 20. Linkage blade; 21. Third connecting rod; 22. Second connecting rod; 23. Fixed mounting bracket; 24. Driven fan blade; 25. Compressing roller; 26. First filter screen; 27. Second filter screen; 28. Controller. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," "third," "fourth," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0039] Currently, there is a lack of wellbore pressure regulating devices, making it difficult to maintain the pressure difference between the annular flow pressure in the wellbore and the formation fluid pressure within the wellbore within a safe range. During drilling, if the annular pressure is significantly higher than the formation fluid pressure, well leakage will occur, affecting wellbore safety. Therefore, a wellbore pressure regulating device is urgently needed. To address the above technical problems, this invention provides a pressure regulating device for drilling wellbores, which has the advantage of being able to regulate the annular flow pressure in the wellbore. The technical solution of this invention will be described in detail below with specific examples.

[0040] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, the present invention relates to a flow pressure regulating device for drilling wellbore, comprising an isolation plate 5, a linkage assembly 9, a driven assembly 13, and an regulating assembly 14. The isolation plate 5 has an inner cavity extending through its center, which is used to seal and connect two adjacent drill pipes 2. The outer edge of the isolation plate 5, specifically the outer edge portion 3, seals the outer wall of the drill pipe 2 via a sealing ring 6. The outer edge portion 3 is used to block the wellbore annulus 1 formed by the drill pipe 2 and the well wall. The isolation plate 5 has a through hole 10 communicating with the wellbore annulus 1.

[0041] The linkage assembly 9 includes a linkage blade 20, which is located inside the inner cavity and is movably mounted on the isolation plate 5. The linkage blade 20 rotates circumferentially along the drill pipe 2 inside the inner cavity under the push of the drilling fluid.

[0042] The driven component 13 includes a driven fan blade 24, which is movably disposed inside the through hole 10. The driven fan blade 24 is connected to the linkage blade 20 for transmission. The linkage blade 20 drives the driven fan blade 24 to adjust the liquid flow rate inside the through hole 10.

[0043] The adjustment assembly 14 includes a drive unit 15 and a controller 28. The drive unit 15 is drivenly connected to the linkage blade 20, which has an inclination angle in the drilling fluid flow direction of the drill pipe 2. The drive unit 15 drives the linkage blade 20 to rotate to adjust the inclination angle. The controller 28 is electrically connected to the drive unit 15 to control the drive unit 15, and the controller 28 is wirelessly connected to an external remote control device.

[0044] It should be noted that during the drilling process, as the drilling depth increases, drill pipe 2 needs to be gradually added into the well according to the depth. This device is installed at the end of the drill pipe 2 to seal and connect adjacent drill pipes 2. As the drill pipe 2 is lowered, multiple flow pressure regulating devices are arranged in the well, corresponding to the drill pipe 2, and the devices are distributed in stages at intervals. During drilling, drilling fluid is pumped into the bottom of the well through the drill pipe 2 and returns to the surface through the annulus 1. The drilling fluid inside the drill pipe 2 flows in the inner cavity of the isolation plate 5, while the drilling fluid entering the annulus 1 from the bottom of the well gradually returns to the surface through the through hole 10.

[0045] In addition, to enhance the connection rigidity between drill rods 2, an I-shaped connector 4 is provided inside the drill rod 2. The two ends of the I-shaped connector 4 are rings, and the two rings are fixed inside the two drill rods 2 respectively.

[0046] For example, during the drilling process, drilling fluid is continuously pumped into the interior of the drill pipe 2. The flow of drilling fluid will drive the linkage blade 20 to rotate in the inner cavity. At this time, the linkage blade 20 will drive the driven fan blade 24 to rotate in the through hole 10, and the rotating fan blade will regulate the flow rate of the return drilling fluid through the through hole 10.

[0047] When the difference between the flow pressure in the annulus 1 of a certain well section and the fluid pressure in the formation of the well section exceeds the safe range, in order to adjust the flow pressure, the operator can use the remote control device remote controller 28 to make the drive component 15 drive the linkage blade 20 to rotate, thereby adjusting the inclination angle of the linkage blade 20. This has the advantage of being able to adjust the flow pressure in the annulus 1 of the well.

[0048] Regarding the tilt angle adjustment of the linkage blade 20, this invention proposes an application scenario. When the linkage blade 20 is in its initial state, the tilt angle of the linkage blade 20 is 0 degrees. At this time, the linkage blade 20 is parallel to the flow direction of the drilling fluid. The flow of the drilling fluid will cause the linkage blade 20 to rotate slightly, or not enough to cause the linkage blade 20 to rotate.

[0049] When the pressure difference between the flow pressure in the annulus 1 of a certain well section and the fluid pressure in the formation of the well section exceeds the safe range, the inclination angle of the linkage blade 20 is adjusted so that the rotation of the linkage blade 20 synchronously links the driven fan blade 24 to rotate in the through hole 10. At this time, the rotation direction of the driven fan blade 24 corresponds to the return drilling fluid. The rotation of the driven fan blade 24 promotes the flow of the return drilling fluid in the well section, thereby increasing the flow rate of the return drilling fluid in the well section, and ultimately achieving the effect of reducing the fluid pressure in the well section, thus realizing the regulation of the flow pressure in the annulus 1 of the well.

[0050] When the pressure difference between the flow pressure in the annulus 1 of a certain well section and the fluid pressure in the formation where the well section is located is lower than the safe range, the inclination angle of the linkage blade 20 is adjusted so that the rotation of the linkage blade 20 synchronously links the driven fan blade 24 to rotate in the through hole 10. At this time, the rotation direction of the driven fan blade 24 is opposite to that of the return drilling fluid. The rotation of the driven fan blade 24 inhibits the flow of the return drilling fluid in the well section, thereby reducing the flow rate of the return drilling fluid in the well section, and ultimately achieving the effect of increasing the fluid pressure in the well section, thus realizing the regulation of the flow pressure in the annulus 1 of the well.

[0051] In one embodiment, the overall structure of the linkage component 9 is further refined. The linkage component 9 also includes a linkage rotating ring 7, which is located inside the inner cavity and is rotatably and sealed to the isolation disc 5. A mounting base 18 is fixedly provided on the inner wall of the linkage rotating ring 7, and the linkage blade 20 is rotatably connected to the mounting base 18.

[0052] It should be noted that, in this embodiment, the inner wall of the linkage rotating ring 7 forms part of the inner cavity of the isolation disk 5, and the linkage blade 20 is installed inside the isolation disk 5 through the mounting base 18 and the linkage rotating ring 7. The rotation of the linkage blade 20 will drive the linkage rotating ring 7 to rotate synchronously.

[0053] Reference Figure 4 as well as Figure 5 As shown, in this embodiment, the mounting base 18 includes a turntable 19, and the linkage blade 20 is rotatably connected to the mounting base 18 via the turntable 19. The driving component 15 includes a hydraulic telescopic cylinder, and the telescopic shaft 17 of the hydraulic telescopic cylinder is connected to the turntable 19 for transmission. The telescopic action of the telescopic shaft 17 pulls the turntable 19 to rotate.

[0054] Specifically, in this embodiment, the telescopic shaft 17 is fixedly connected to the first connecting rod 16, the turntable 19 is ball-jointed to the second connecting rod 22, and a third connecting rod 21 is also provided. One end of the third connecting rod 21 is ball-jointed to the first connecting rod 16, and the other end is ball-jointed to the second connecting rod 22. Therefore, the extension and retraction of the telescopic shaft 17 will be achieved by pulling the turntable 19 in sequence through the first connecting rod 16, the third connecting rod 21, and the second connecting rod 22 to achieve rotational adjustment.

[0055] In this embodiment, corresponding to the above application scenario, when the linkage blade 20 is in the initial state, the tilt angle of the linkage blade 20 is 0 degrees. At this time, the extension stroke of the telescopic shaft 17 is in the middle position. Therefore, the push-pull turntable 19 can not only adjust the rotation direction of the linkage blade 20, but also control the rotation speed of the linkage blade 20 by adjusting the size of the tilt angle.

[0056] More preferably, in this embodiment, when the inclination angle of the linkage blade 20 is at the midpoint of the adjustment range, the obstruction area formed by the projection of the linkage blade 20 in the drilling fluid flow direction is 3 / 4 of the drilling cross-sectional area. This optimizes the kinetic energy conversion of the linkage blade 20 while ensuring smooth flow of the slurry within the drill pipe 2.

[0057] Specifically, in this embodiment, in order to optimize the smoothness of rotation of the linkage blade 20, multiple linkage blades 20 are provided, specifically six, and they are evenly distributed along the circumference of the linkage ring 7. The number and position of the mounting base 18 and the adjustment component 14 are set to correspond to each linkage blade 20.

[0058] In one embodiment, the driven component 13 is further refined, and the driven component 13 also includes a driven rotating ring 11, which is rotatably connected to the isolation disk 5, and a through hole 10 is formed in the inner wall of the driven rotating ring 11. The driven fan blade 24 is fixedly disposed inside the driven rotating ring 11, and the axial direction of the driven fan blade 24 is arranged in the same direction as the rotation axis of the driven rotating ring 11.

[0059] It should be noted that the flow pressure regulating device also includes a transmission assembly, which includes a first transmission gear ring 8 and a second transmission gear ring 12. The first transmission gear ring 8 is fixedly disposed outside the linkage rotating ring 7, and the second transmission gear ring 12 is fixedly disposed outside the driven rotating ring 11. The first transmission gear ring 8 and the second transmission gear ring 12 mesh with each other.

[0060] For example, when the linkage blade 20 rotates under the push of the drilling fluid, it will drive the linkage ring 7 to rotate synchronously. The rotation of the linkage ring 7 will be driven by the meshing first transmission gear ring 8 and second transmission gear ring 12 to rotate the linkage transmission ring, and finally the linkage transmission fan blade will rotate, thereby realizing the transmission function.

[0061] In this embodiment, more preferably, a first filter screen 26 is provided at the bottom end of the inner wall. The first filter screen 26 can perform the function of filtering rock debris. In addition, a rolling roller 25 is provided above and below the first filter screen 26, and the rolling roller 25 is fixedly connected to the driven rotating ring 11.

[0062] It should be noted that by using the first filter screen 26 to filter the rock cuttings in the liquid in the wellbore annulus 1, and by using the rolling roller 25 to crush the rock cuttings trapped in the area of ​​the first filter screen 26, the newly generated and flowing rock cuttings can be processed in a timely manner. This not only helps to ensure the smooth flow of the liquid in the wellbore annulus 1, but also makes the distribution of the liquid and rock cuttings in the wellbore annulus 1 uniform. This, in turn, helps to make the pressure of the liquid in the wellbore annulus 1 on the formation outside the wellbore more uniform, and makes the pressure generated during the circulation of the liquid more uniform.

[0063] In this embodiment, more preferably, in order to further filter rock debris, a second filter screen 27 is also provided on the inner wall. The pores of the second filter screen 27 are larger than those of the first filter screen 26, and the second filter screen 27 is located between the driven fan blade 24 and the first filter screen 26.

[0064] Specifically, a fixed mounting bracket 23 is provided inside the driven rotating ring 11, and the driven fan blade 24, the first filter screen 26, the second filter screen 27 and the rolling roller 25 are all fixedly mounted on the fixed mounting bracket 23.

[0065] In an extended embodiment, a fluid pressure sensor is installed on the second filter 27. The fluid pressure sensor is wirelessly connected to an external display module to monitor the fluid pressure inside the annulus 1 of the wellbore, specifically the formation fluid pressure outside the corresponding section of the annulus 1. This allows external personnel to monitor the fluid pressure inside the annulus 1 in real time. During actual operation, personnel can use the combined monitoring changes from two adjacent fluid pressure sensors to reference one or more sections of the annulus 1, thereby promptly understanding and adjusting the fluid pressure within the annulus 1.

[0066] Even better, a collision sensor is also provided on the second filter 27 to monitor the collision force and frequency, so as to understand the distribution of rock cuttings in the liquid in the wellbore annulus 1 in a timely manner.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure regulating device for drilling wellbore, characterized in that, The flow pressure regulating device includes: An isolation disc has an inner cavity extending through its center, which is used to seal and connect two adjacent drill pipes. The outer edge of the isolation disc is used to block the wellbore annulus formed by the drill pipe and the well wall. The isolation disc has a through hole communicating with the wellbore annulus. The linkage assembly includes a linkage blade located inside the inner cavity and movably mounted on the isolation disc. The linkage blade rotates circumferentially along the drill pipe inside the inner cavity under the influence of drilling fluid. The linkage assembly also includes a linkage rotating ring located inside the inner cavity and rotatably and sealingly connected to the isolation disc. A mounting base is provided on the inner wall of the linkage rotating ring, and the linkage blade is rotatably connected to the mounting base. The driven assembly includes a driven fan blade movably disposed inside the through hole, and the driven fan blade is driven by a linkage blade, which drives the driven fan blade to adjust the liquid flow rate inside the through hole. The driven assembly also includes a driven rotating ring rotatably connected to the isolation disc, with the through hole formed by the inner wall of the driven rotating ring. The driven fan blade is fixedly disposed inside the driven rotating ring, and the axial direction of the driven fan blade is the same as the rotational axis of the driven rotating ring. A first filter screen is disposed at the bottom end of the inner wall of the driven rotating ring, and a pressing roller is disposed below the first filter screen, with the pressing roller fixedly connected to the driven rotating ring. The system also includes an adjustment assembly, which comprises a drive unit and a controller. The drive unit is connected to the linkage blade, and the linkage blade has an inclination angle in the drilling fluid flow direction of the drill pipe. The drive unit drives the linkage blade to rotate to adjust the inclination angle. The controller is electrically connected to the drive unit to control the drive unit, and the controller is wirelessly connected to an external remote control device.

2. The flow pressure regulating device according to claim 1, characterized in that, The mounting base includes a turntable, and the linkage blade is rotatably connected to the mounting base via the turntable; The driving component includes a hydraulic telescopic cylinder, the telescopic shaft of which is connected to the turntable via a transmission connection, and the telescopic action of the telescopic shaft pulls the turntable to rotate.

3. The flow pressure regulating device according to claim 1, characterized in that, The inner wall of the driven rotating ring is also provided with a second filter screen, the pores of the second filter screen are larger than those of the first filter screen, and the second filter screen is located between the driven fan blade and the first filter screen.

4. The flow pressure regulating device according to claim 1, characterized in that, The flow pressure regulating device further includes a transmission assembly, which includes: A first transmission gear ring, the first transmission gear ring being fixedly disposed outside the linkage rotating ring; and The second transmission gear ring is fixedly disposed outside the driven rotating ring; The first transmission gear ring meshes with the second transmission gear ring.

5. The flow pressure regulating device according to any one of claims 1-4, characterized in that, The linkage blades are provided in multiple quantities and are evenly distributed along the circumference of the linkage rotating ring.

6. The flow pressure regulating device according to claim 5, characterized in that, When the inclination angle of the linkage blade is at the maximum value of the adjustment range, the blocking area formed by the projection of the linkage blade in the direction of drilling fluid flow is 3 / 4 of the drilling cross-sectional area.

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