Automatic cleaning device for inner wall of drill rod

Abstract

The invention provides an automatic cleaning device for the inner wall of a drill rod. The device comprises a rubber fixing cylinder, a stroke cylinder, a measurement and control cylinder, a grabbing and leaning cylinder and a balancing weight mounting cylinder which are arranged in sequence. Cleaning rubber is vulcanized and cemented outside the rubber fixing cylinder, the rubber fixing cylinder is connected with a fishing cone, and a reset spring is arranged in the rubber fixing cylinder; two V-shaped connecting rods are rotationally connected in the stroke cylinder, a pre-tightening spring is connected between the connecting rods, and a compression counter is arranged on the pre-tightening spring; a stroke wheel is arranged at the extending end of the connecting rod, a permanent magnet is arranged on the outer edge of the stroke wheel, and a Hall sensor is arranged on the connecting rod; a travel switch connected with the Hall sensor and the circuit board is arranged in the travel cylinder; an electromagnet and a radial compression spring are arranged in the stroke cylinder, and magnetic slips are arranged at the two ends of the compression spring and can retract into / extend out of the grabbing cylinder; a circuit board and a battery which are connected with each other are arranged in the measurement and control cylinder; and a balancing weight is arranged on the balancing weight mounting cylinder. The inner wall of the drill rod can be efficiently cleaned, and the drilling period is effectively shortened.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling engineering technology, specifically to an automatic cleaning device for the inner wall of drill pipe. Background Technology

[0002] During oil and gas well drilling, various operations such as changing drill tools, short trips, and well cleaning involve tripping operations. To maintain drilling safety and a clean drilling surface, drill pipe cleaning is typically required during tripping. While external drill pipe cleaning is currently available, the lack of internal drill pipe cleaning technology means that drilling mud remains scattered across the drilling surface during tripping. Existing drill pipe internal cleaners cannot perform counting based on stroke measurement. Therefore, providing an automatic drill pipe internal cleaning device capable of counting is of significant importance.

[0003] Various drill pipe cleaners have been invented both domestically and internationally, mainly falling into two categories: external drill pipe cleaners and internal drill pipe cleaners. External drill pipe cleaners are primarily categorized into three types: purely mechanical, electric, and hydraulic. For example, Chinese patent application number "CN201620190565.5" entitled "A Drill Pipe Cleaner" discloses a drill pipe cleaner comprising two clamping platforms, both positioned within a horizontal separating track. The opposite end faces of the two clamping platforms each have semi-conical grooves, with brushes mounted on the concave surfaces of these grooves. Electromagnets are installed along the edges of each semi-conical groove. Lifting springs are fixedly mounted on the side of each clamping platform at the end furthest from the semi-conical grooves, with the other end of the springs connected to the horizontal separating track. The electromagnets are connected to a controller via wires. Water channels are provided within each clamping platform, with one end leading to the brushes and the other end leading to the outside of the clamping platform and connected to a water pipe. This cleaner can automatically clean drill pipes, avoiding manual operation in harsh environments and improving cleaning efficiency. However, the structure of this cleaner differs from that of the present application. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to solve one or more problems existing in the prior art. For example, one objective of this invention is to provide an automatic drill pipe inner wall cleaning device that can efficiently clean the inner wall of the drill pipe and effectively shorten the drilling cycle.

[0005] To achieve the above objectives, the present invention provides an automatic cleaning device for the inner wall of a drill pipe. The cleaning device may include a rubber fixing cylinder, a stroke cylinder, a control cylinder, a gripping cylinder, and a counterweight mounting cylinder arranged sequentially. The outer circumferential surface of the rubber fixing cylinder is vulcanized with a plurality of cleaning rubbers. A coaxially arranged retrieval cone is installed in the rubber fixing cylinder, and a return spring is provided within the rubber fixing cylinder, with the retrieval cone located within the return spring. The stroke cylinder has openings on opposite side walls, and two connecting rods rotatably connected to the stroke cylinder are installed within the stroke cylinder. The two connecting rods are arranged in a V-shape, and a preload spring is connected between the two connecting rods. A compression counter is provided on the preload spring. One end of each connecting rod extends out of the opening in the stroke cylinder, and a stroke wheel is provided at the extended end of the connecting rod. The stroke wheel can engage with the inner wall of the drill pipe. The system includes a contact mechanism, a permanent magnet on the outer edge of the stroke wheel, and a Hall sensor on the connecting rod. A limit switch is located inside the stroke cylinder and connected to the Hall sensor. Openings are located on opposite side walls of the gripping cylinder. A compression spring and several electromagnets are installed inside the stroke cylinder. The compression spring is arranged radially along the gripping cylinder, and the electromagnets are located within it. Magnetic slips are located at both ends of the compression spring. When the electromagnet is energized / de-energized, the magnetic slips retract / extend through the openings in the gripping cylinder, thus fixing / unfixing the drill pipe inner wall automatic cleaning device to the drill pipe inner wall. A circuit board and battery are located inside the control cylinder. The battery is connected to the electromagnet, and the circuit board controls the connection / disconnection between the battery and the electromagnet. The circuit board is also connected to the limit switch. A counterweight is installed on the counterweight mounting cylinder.

[0006] According to one or more exemplary embodiments of one aspect of the present invention, the cleaning rubber may include a plurality of cleaning blades, which may be annular.

[0007] Furthermore, the cleaning rubber may include 1 to 3 cleaning blades.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the rubber fixing cylinder may also be provided with a sealing ring, which is sleeved on the retrieval cone and located above the return spring.

[0009] Furthermore, the sealing ring may include an O-ring.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the outer edge of the travel wheel may be provided with friction teeth.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the gripping cylinder may be provided with 2 to 3 electromagnets distributed symmetrically on an axis.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the lower end of the counterweight mounting cylinder may be machined into an arc surface.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, the counterweight may be hexagonal in shape and may be threadedly connected to the counterweight mounting cylinder.

[0014] According to one or more exemplary embodiments of one aspect of the present invention, the material of the counterweight may include lead.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0016] (1) The automatic cleaning device for the inner wall of the drill pipe proposed in this invention can prevent mud from dripping onto the drilling platform, reduce the risk of drilling workers slipping, reduce the intensity of cleaning labor, improve the efficiency of tripping operations, and effectively shorten the drilling cycle.

[0017] (2) The automatic cleaning device for the inner wall of the drill pipe proposed in this invention has friction teeth on the stroke wheel, which can prevent the stroke wheel from slipping. The main purpose is to make it roll and avoid slipping. Slipping will cause the distance to be inaccurate and improve the accuracy of stroke measurement.

[0018] (3) The counterweight mounting cylinder in the automatic cleaning device for the inner wall of the drill pipe proposed in this invention can improve the passability of the cleaning device through its arc surface design. Attached Figure Description

[0019] The above and other objects and features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of the automatic cleaning device for the inner wall of the drill pipe of the present invention is shown;

[0021] Figure 2 A cross-sectional schematic diagram of the automatic cleaning device for the inner wall of the drill pipe of the present invention is shown.

[0022] Explanation of key figure labels:

[0023] 1-Rubber fixing cylinder, 11-Cleaning rubber, 111-Cleaning blade, 12-Reset spring, 13-O-ring, 14-Retrieving cone, 2-Stroke cylinder, 21-Connecting rod, 22-Stroke wheel, 23-Preload spring, 24-Permanent magnet, 25-Hall sensor, 26-Friction tooth, 27-Limit switch, 28-First fixing screw, 29-Rotating bolt, 210-Stroke wheel screw, 3-Grabbing cylinder, 31-Magnetic clip, 32-Second fixing screw, 33-Cover plate, 4-Control cylinder, 41-Circuit board, 42-Battery, 5-Counterweight mounting cylinder, 51-Counterweight. Detailed Implementation

[0024] In the following, an automatic cleaning device for the inner wall of a drill pipe according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0025] In the description of this application, it should be understood that the terms “middle”, “upper”, “lower”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, etc., 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 application and simplifying the description, and do not 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 application.

[0026] The terms "first," "second," etc., are used merely for ease of description and distinction, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" or "several" means two or more.

[0027] In the description of this application, 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Exemplary Example 1

[0029] This exemplary embodiment provides an automatic cleaning device for the inner wall of a drill pipe.

[0030] Figure 1 A schematic diagram of the automatic cleaning device for the inner wall of the drill pipe of the present invention is shown; Figure 2 A cross-sectional schematic diagram of the automatic cleaning device for the inner wall of the drill pipe of the present invention is shown below. Figures 1 to 2 This exemplary embodiment describes an automatic cleaning device for the inner wall of a drill pipe.

[0031] like Figures 1-2 As shown, the automatic cleaning device for the inner wall of the drill pipe mainly includes a rubber fixing cylinder 1, a stroke cylinder 2, a measurement and control cylinder 4, a gripping cylinder 3, and a counterweight mounting cylinder 5 arranged in sequence.

[0032] The rubber fixing cylinder 1 has several clean rubber 11 vulcanized and bonded to its circumferential outer surface. A retrieval cone 14 is coaxially mounted inside the rubber fixing cylinder 1. A return spring 12 is installed inside the rubber fixing cylinder 1, and the retrieval cone 14 is located within the return spring 12. Here, the return spring mainly provides a reset mechanism to ensure that the retrieval cone can return to its initial state after the operation is completed. The stroke cylinder 2 has openings on its opposite side walls. Two connecting rods 21 are installed in the stroke cylinder 2 and are rotatably connected to it. The two connecting rods 21 are arranged in a V-shape and a preload spring 23 is connected between the two connecting rods 21. The preload spring 23 is equipped with a compression counter. One end of the connecting rod 21 extends out of the opening of the stroke cylinder 2. The extended end of the connecting rod 21 is equipped with a stroke wheel 22, which can contact the inner wall of the drill pipe. The outer edge of the stroke wheel 22 is equipped with a permanent magnet 24. A Hall sensor 25 is equipped on the connecting rod 21. A limit switch 27 is provided in the stroke cylinder 2. The limit switch 27 is connected to the Hall sensor 25. The stroke of the automatic cleaning device for the inner wall of the drill pipe can be obtained according to the number of rotations of the stroke wheel recorded by the Hall sensor. The gripping cylinder 3 has openings on its opposite side walls. A compression spring and several electromagnets are installed in the stroke cylinder 2. The compression spring is arranged radially along the gripping cylinder 3, and the electromagnets are located within it. Magnetic slips 31 are provided at both ends of the compression spring. When the electromagnet is energized / de-energized, the magnetic slips 31 retract / extend through the openings in the gripping cylinder 3, thus fixing / unfixing the automatic cleaning device on the drill pipe inner wall to the drill pipe inner wall. A circuit board 41 and a battery 42 are installed in the control cylinder 4. The battery 42 is connected to the electromagnet, and the circuit board 41 controls the connection / disconnection between the battery 42 and the electromagnet. The circuit board 41 is also connected to the limit switch 27. When the limit switch reaches the required working stroke, the circuit board can control the battery to disconnect from the electromagnet, fixing the cleaning device to the drill pipe inner wall. A counterweight 51 is installed on the counterweight mounting cylinder 5.

[0033] In this exemplary embodiment, the stroke cylinder and the rubber fixing cylinder may be threadedly connected; the gripping cylinder and the stroke cylinder may be threadedly connected; and the measurement and control cylinder and the gripping cylinder may be threadedly connected.

[0034] In this exemplary embodiment, as Figure 1 As shown, the cleaning rubber 11 may include a plurality of cleaning blades 111. The cleaning blades may be annular.

[0035] Furthermore, the cleaning rubber may include 1 to 3 cleaning blades. For example, such as Figure 1 As shown, the automatic cleaning device for the inner wall of the drill pipe has two cleaning blades.

[0036] In this exemplary embodiment, a sealing ring may also be provided in the rubber fixing cylinder. The sealing ring is sleeved on the retrieval cone and is located above the return spring. Further, the sealing ring may include an O-ring. Figure 2 As shown, the O-ring 13 is placed on the retrieval cone.

[0037] In this exemplary embodiment, as Figure 2 As shown, friction teeth 26 may be provided on the outer edge of the travel wheel 22.

[0038] In this exemplary embodiment, the gripping cylinder may be provided with 2 to 3 electromagnets that are symmetrically distributed.

[0039] In this exemplary embodiment, the lower end of the counterweight mounting cylinder can be machined into an arc surface to improve the passability of the automatic cleaning device for the inner wall of the drill pipe.

[0040] In this exemplary embodiment, the counterweight may be hexagonal in shape. The counterweight may be threadedly connected to a counterweight mounting cylinder for easy installation.

[0041] In this exemplary embodiment, the counterweight may be made of lead, which may reduce the size of the counterweight.

[0042] In this exemplary embodiment, as Figure 2 As shown, the limit switch 27 can be fixed in the limit cylinder 2 by the first fixing screw 28.

[0043] In this exemplary embodiment, as Figure 2 As shown, the connecting rod 21 can be fixed by the rotating bolt 29, that is, the connecting rod 21 is rotatably connected to the stroke cylinder by rotating the bolt 29.

[0044] In this exemplary embodiment, as Figure 1 As shown, the travel wheel 22 can be connected to the connecting rod 21 via the travel wheel screw 210.

[0045] In this exemplary embodiment, as Figure 1 As shown, a cover plate 33 can be installed in the opening of the gripping cylinder 3. The hole on the cover plate is larger than the diameter of the extended magnetic slip. The magnetic slip can be slidably installed in the opening through the cover plate. When it is necessary to fix the automatic cleaning device on the inner wall of the drill pipe, the magnetic slip extends out of the cylinder through the opening. Here, the slip has a boss. For ease of installation, the diameter of the slip extension hole is larger than the diameter of the slip boss, and the hole on the cover plate is smaller than the diameter of the slip boss, thus constraining the magnetic slip.

[0046] In this exemplary embodiment, as Figure 1 As shown, a second fixing screw 32 can be used to fix the cover plate 33.

[0047] In this exemplary embodiment, the present invention can measure the travel distance of the automatic cleaning device for the inner wall of drill pipes in two ways. First, when the travel wheel passes through the narrow section of the drill pipe connection, it contracts, the return spring compresses and then returns to its original position. A compression counter records the number of times the return spring is compressed, thus determining how many drill pipes the cleaning device has passed (recording the number of cleaned drill pipes). Since each drill pipe has the same length, multiplying the length of each drill pipe by the number of compression counter readings yields the travel distance. Second, the travel distance of the cleaning device can be calculated by multiplying the number of rotations of the travel wheel recorded by the Hall sensor by the circumference of the travel wheel. The travel distance of the cleaning device can be cross-referenced using the data from the compression counter and the rotation data of the travel wheel (i.e., the two methods described above).

[0048] The method of using / operating the automatic drill pipe inner wall cleaning device of the present invention may include: When the drill pipe inner wall cleaning device slides down for cleaning, the V-shaped support frame can extend the travel wheel out of the travel cylinder and contact the inner wall of the drill pipe. The friction causes the travel wheel to rotate. The Hall sensor senses the permanent magnet and counts the number of rotations of the travel wheel to obtain the distance traveled by the cleaning device inside the drill pipe. When the travel wheel passes through the narrow part of the drill pipe connection, it will retract. The return spring is compressed and then reset. The compression counter records the number of times the return spring is compressed to know how many drill pipes the cleaning device has passed, and thus the distance traveled by the cleaning device. At this time, the electromagnet is energized and has magnetism, causing the magnetic latch to retract. If it is necessary to fix the cleaning device (for example, when the travel of the cleaning device reaches the travel set in the limit switch), the electromagnet can be de-energized, the magnetism disappears, and the magnetic latch, pushed by the pre-tightening spring, extends out of the cylinder and engages with the inner wall of the drill pipe, thus fixing the cleaning device to the inner wall of the drill pipe. This invention allows the drill pipe inner wall cleaning device to be fixed inside the drill pipe according to work requirements, while also knowing the travel distance of the drill pipe inner wall cleaning device inside the drill pipe, and preventing the drill pipe inner wall cleaning device from falling off.

[0049] In summary, the beneficial effects include:

[0050] This invention provides an automatic drill pipe inner wall cleaning device, mainly applied in the field of oil and gas drilling engineering technology. The automatic drill pipe inner wall cleaning device can prevent mud from dripping onto the drill platform, reducing the risk of slipping for drilling workers, reducing the intensity of cleaning labor, improving the efficiency of tripping operations, and effectively shortening the drilling cycle.

[0051] Although an automatic cleaning device for the inner wall of a drill pipe according to the present invention has been described above in conjunction with exemplary embodiments, those skilled in the art should understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. An automatic cleaning device for the inner wall of a drill pipe, characterized in that, The cleaning device includes, in sequence, a rubber fixing cylinder, a stroke cylinder, a measurement and control cylinder, a gripping cylinder, and a counterweight mounting cylinder, wherein... The outer circumferential surface of the rubber fixing cylinder is vulcanized with a number of clean rubbers. A retrieval cone is installed in the rubber fixing cylinder on the same axis. A return spring is installed in the rubber fixing cylinder, and the retrieval cone is located in the return spring. The stroke cylinder has openings on its opposite side walls. Two connecting rods, rotatably connected to the stroke cylinder, are installed inside the stroke cylinder. The two connecting rods are arranged in a V-shape and a preload spring is connected between the two connecting rods. The preload spring is equipped with a compression counter. One end of the connecting rod extends out of the opening of the stroke cylinder and has a stroke wheel at the extended end. The stroke wheel can contact the inner wall of the drill pipe. A permanent magnet is provided on the outer edge of the stroke wheel. A Hall sensor is provided on the connecting rod. A limit switch is provided inside the stroke cylinder and is connected to the Hall sensor. The gripping cylinder has openings on its opposite side walls. A compression spring and several electromagnets are installed in the stroke cylinder. The compression spring is arranged along the radial direction of the gripping cylinder. The electromagnets are located in the compression spring. Magnetic slips are provided at both ends of the compression spring. When the electromagnet is turned on / off, the magnetic slips retract into / extrude from the gripping cylinder through the opening of the gripping cylinder, so that the automatic cleaning device of the drill pipe inner wall is not fixed / fixed to the inner wall of the drill pipe. The control tube contains a circuit board and a battery. The battery is connected to an electromagnet, and the circuit board controls the connection / disconnection between the battery and the electromagnet. The circuit board is also connected to a limit switch. The counterweight is installed on the counterweight mounting cylinder.

2. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The cleaning rubber includes multiple cleaning blades, which are arranged in a ring shape.

3. The automatic cleaning device for the inner wall of the drill pipe according to claim 2, characterized in that, The cleaning rubber includes 1 to 3 cleaning blades.

4. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The rubber fixing cylinder is also equipped with a sealing ring, which is sleeved on the retrieval cone and located above the return spring.

5. The automatic cleaning device for the inner wall of the drill pipe according to claim 4, characterized in that, The sealing ring includes an O-ring.

6. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The outer edge of the travel wheel is provided with friction teeth.

7. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The gripping cylinder is equipped with 2 to 3 electromagnets that are symmetrically distributed along an axis.

8. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The lower end of the counterweight mounting cylinder is machined into an arc surface.

9. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The counterweight is hexagonal in shape and is threadedly connected to the counterweight mounting cylinder.

10. The automatic cleaning device for the inner wall of the drill pipe according to claim 1, characterized in that, The counterweight is made of lead.

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