Plate spring type drill rod inner wall mud scraping device

Abstract

The invention provides a plate spring type drill rod inner wall mud scraping device which comprises a fixing cylinder, a plate spring brake assembly, a control assembly and a righting assembly. A mud scraping assembly is arranged at the lower end of the fixing cylinder. The plate spring brake assembly comprises a plate spring supporting outer barrel, three plate spring extending grooves are formed in the side wall of the plate spring supporting outer barrel, a plate spring piece is arranged in each plate spring extending groove, a transmission screw is rotationally installed in the middle of the plate spring supporting outer barrel, the transmission screw and the plate spring supporting outer barrel are coaxially arranged, the transmission screw is sleeved with a wedge-shaped sliding block in a threaded mode, and the wedge-shaped sliding block is in threaded connection with the plate spring supporting outer barrel. The transmission screw rotates to drive the wedge-shaped sliding block to slide up and down on the transmission screw, the wedge-shaped sliding block drives the plate spring piece to deform, and the lower portion of the plate spring supporting outer barrel is fixedly connected with the top of the fixing barrel in a threaded mode. The mud scraping device can effectively clean mud on the inner wall of the drill rod, through the telescopic design of the plate spring, the mud scraping device can be braked and fixed in the drill rod, the mud scraping speed is controllable, and the mud scraping device can adapt to the change of a drill rod coupling shoulder.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas drilling engineering, in particular to a leaf spring type drill pipe inner wall mud scraping device. Background Art

[0002] During the drilling process of oil and gas wells, various working conditions such as changing drill tools, short drilling, and well cleaning involve drilling operations. In order to keep the drilling operation safe and the drill floor clean, it is usually necessary to scrape the mud from the drill pipe during the drilling process. At present, scraping the mud from the outer wall of the drill pipe has been achieved. However, due to the lack of technology for scraping the mud from the inner wall of the drill pipe, mud is still all over the drill floor during the drilling process.

[0003] A variety of drill pipe scrapers have been invented at home and abroad, mainly including drill pipe outer wall scrapers and drill pipe inner wall scrapers. Among them, drill pipe inner wall scrapers are mainly passive scrapers, which are placed directly into the drill pipe and slide down by the inertia of the scraper's own weight to scrape the mud on the inner wall of the drill pipe. The movement of existing scrapers in the drill pipe is uncontrollable, and they generally fall directly by their own gravity to scrape the mud, which is easy to fall into the well and cause fish to fall.

[0004] Therefore, designing a drill rod inner wall scraper device that can fall freely in the drill rod and can be fixed in the drill rod at any time is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a leaf spring drill pipe inner wall scraper device, which can effectively clean the mud on the inner wall of the drill pipe, and through the telescopic design of the leaf spring, the scraper device can be braked and fixed in the drill pipe, so that the scraping speed is controllable and can adapt to the changes of the drill pipe coupling shoulder.

[0006] The embodiment of the present invention is achieved as follows:

[0007] The present invention provides a leaf spring drill pipe inner wall scraping device, comprising a fixed cylinder, a leaf spring brake assembly is arranged at the upper end of the fixed cylinder, a control assembly is arranged in the fixed cylinder, a straightening assembly is arranged at the upper end of the leaf spring brake assembly, and a scraping assembly is arranged at the lower end of the fixed cylinder; the leaf spring brake assembly comprises a leaf spring support outer cylinder, three leaf spring extension grooves are arranged on the side wall of the leaf spring support outer cylinder, a leaf spring sheet is arranged in each of the leaf spring extension grooves, a transmission screw is rotatably installed at the middle part of the leaf spring support outer cylinder, the transmission screw is coaxially arranged with the leaf spring support outer cylinder, a wedge-shaped slider is threadedly sleeved on the transmission screw, the rotation of the transmission screw drives the wedge-shaped slider to slide up and down on the transmission screw, the wedge-shaped slider drives the leaf spring sheet to deform, and the lower part of the leaf spring support outer cylinder is threadedly fixedly connected with the top of the fixed cylinder; the control assembly comprises a battery, a control circuit board and a drive motor which are arranged in the fixed cylinder from bottom to top in sequence, the drive motor is transmission-connected with the transmission screw, the control circuit board and the drive motor are electrically connected with the battery, and the control circuit board is used to control the rotation of the drive motor.

[0008] Preferably, a boss is provided in the middle of the inner side of the leaf spring, the boss is adapted to the shape of the wedge-shaped slider, limiting axes are provided at both ends of the leaf spring, limiting grooves are provided at both ends of the leaf spring extension groove, and the limiting axis is located in the corresponding limiting groove.

[0009] Preferably, the drive motor is a planetary DC reduction motor, and the output shaft of the drive motor is rotationally connected to the screw rod.

[0010] Preferably, the upper and lower ends of the transmission screw are rotatably connected to the leaf spring supporting outer cylinder through bearings.

[0011] Preferably, the righting assembly comprises a righting shaft, the outer wall of the righting shaft is evenly distributed with at least three righting rubbers, and the righting shaft is fixedly connected to the leaf spring support outer cylinder via threads.

[0012] Preferably, an armature is provided at the top end of the straightening shaft.

[0013] Preferably, the scraper assembly comprises a scraper shaft threadedly fixedly connected to the bottom of the fixed cylinder, the scraper shaft is evenly provided with three layers of scraper rubber, the scraper rubber is evenly provided with openings, and the openings on the three layers of scraper rubber are staggered.

[0014] Preferably, a guide head is fixedly connected to the lower portion of the scraper shaft, a counterweight block is sleeved on the guide head, and the counterweight block is fixedly mounted on the guide head by fixing bolts.

[0015] Preferably, a Hall sensor is installed on the inner side of the leaf spring, and the leaf spring is a beryllium bronze leaf spring.

[0016] Preferably, a safety valve or a constant-pressure break film is provided on the fixed cylinder.

[0017] The beneficial effects of the leaf spring type drill pipe inner wall scraper device provided by the present invention include:

[0018] 1. The present invention can directly extend into the drill pipe and slide down in the drill pipe by its own gravity, so that the scraper rubber can scrape the mud on the inner wall of the drill pipe, effectively reducing the mud on the inner wall of the drill pipe from splashing on the drilling table, significantly reducing the risk of drilling workers slipping, improving the efficiency of drilling operations, and reducing labor intensity;

[0019] 2. The wedge-shaped slider is driven by the driving motor to move, so that the leaf spring is extended to contact the inner wall of the drill pipe, increasing the friction between the scraper device and the inner wall of the drill pipe, so that the scraper device can be retrieved in the drill pipe or directly fixed in the drill pipe, which helps to control the speed of the scraper device falling and prevent the scraper device from falling. When braking is not needed, the wedge-shaped slider is driven by the driving motor to release the constraint on the leaf spring, and the leaf spring is retracted into the leaf spring extension groove under the action of its own restoring force;

[0020] 3. The control circuit board can control the positive and negative rotation of the drive motor, thereby driving the wedge-shaped slider to slide up and down, and control the leaf spring brake assembly. At the same time, the Hall sensor on the leaf spring records the retraction of the leaf spring when it passes through the shoulder of the drill pipe coupling, thereby calculating the number of times the scraper device passes through the drill pipe and estimating the position of the scraper device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 3 For the present invention Figure 2 A partial enlarged schematic diagram of point A in the middle

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the leaf spring supporting the outer cylinder in the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the leaf spring in the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the wedge-shaped slider in the present invention;

[0028] Figure 7 It is a structural schematic diagram of the righting assembly in the present invention;

[0029] Icons: 1. Fixing cylinder; 11. Battery; 12. Control circuit board; 13. Driving motor; 2. Leaf spring brake assembly; 21. Leaf spring supporting outer cylinder; 22. Leaf spring extension slot; 221. Limiting slot; 23. Leaf spring leaf; 231. Boss; 232. Limiting shaft; 24. Drive screw; 25. Wedge-shaped slider; 3. Righting assembly; 31. Righting shaft; 32. Righting rubber; 33. Armature; 4. Scraping assembly; 41. Scraping shaft; 42. Scraping rubber; 43. Guide head; 44. Counterweight; 45. Fixing bolt. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1-7 As shown:

[0036] Embodiment 1: Figure 1-6 As shown, the present invention provides a leaf spring drill pipe inner wall scraping device, comprising a fixed cylinder 1, a leaf spring brake assembly 2 is arranged at the upper end of the fixed cylinder 1, a control assembly is arranged inside the fixed cylinder 1, a straightening assembly 3 is arranged at the upper end of the leaf spring brake assembly 2, and a scraping assembly 4 is arranged at the lower end of the fixed cylinder 1; the leaf spring brake assembly 2 comprises a leaf spring support outer cylinder 21, three leaf spring extension grooves 22 are opened on the side wall of the leaf spring support outer cylinder 21, and a leaf spring leaf 23 is arranged in each of the leaf spring extension grooves 22, and a transmission screw 24 is rotatably installed in the middle of the leaf spring support outer cylinder 21, and the transmission screw 24 is synchronous with the leaf spring support outer cylinder 21 The shaft is set, and a wedge-shaped slider 25 is threadedly sleeved on the transmission screw 24. The rotation of the transmission screw 24 drives the wedge-shaped slider 25 to slide up and down on the transmission screw 24, and the wedge-shaped slider 25 drives the leaf spring 23 to deform. The lower part of the leaf spring support outer cylinder 21 is threadedly fixedly connected with the top of the fixed cylinder 1; the control component includes a battery 11, a control circuit board 12 and a drive motor 13 arranged in the fixed cylinder 1 from bottom to top, and the drive motor 13 is transmission-connected to the transmission screw 24, and the control circuit board 12 and the drive motor 13 are electrically connected to the battery 11, and the control circuit board 12 is used to control the rotation of the drive motor 13.

[0037] The present invention can directly extend into the drill pipe and slide down in the drill pipe by its own gravity, so that the scraper rubber 42 scrapes the mud on the inner wall of the drill pipe, effectively reducing the mud on the inner wall of the drill pipe from splashing onto the drilling table, significantly reducing the risk of drilling workers slipping, improving the efficiency of drilling operations, and reducing labor intensity.

[0038] The wedge-shaped slider 25 is driven by the driving motor 13 to move, so that the leaf spring 23 is extended to contact the inner wall of the drill rod, thereby increasing the friction between the scraper device and the inner wall of the drill rod, and the scraper device is retrieved in the drill rod or directly fixed in the drill rod, which helps to control the falling speed of the scraper device and prevent the scraper device from falling. When braking is not needed, the wedge-shaped slider 25 is driven by the driving motor 13 to release the constraint on the leaf spring 23, and the leaf spring 23 can be retracted into the leaf spring extension groove 22 under the action of its own restoring force.

[0039] A boss 231 is provided in the middle of the inner side of the leaf spring 23, and the boss 231 is adapted to the shape of the wedge-shaped slider 25. A limit shaft 232 is provided at both ends of the leaf spring 23, and a limit groove 221 is provided at both ends of the leaf spring extension groove 22, and the limit shaft 232 is located in the corresponding limit groove. The drive motor 13 drives the transmission screw 24 to rotate, so that the wedge-shaped slider 25 moves upward on the transmission screw 24, and then pushes the boss 231, so that the leaf spring 23 is deformed and extends outward, so that it contacts and rubs with the inner wall of the drill pipe to decelerate or fix. When braking and deceleration are not needed, the drive motor 13 rotates, the wedge-shaped slider 25 slides down, and the constraint on the leaf spring 23 is released, and the leaf spring 23 retracts under the action of its own restoring force.

[0040] It should be noted that the drive motor 13 is a planetary DC reduction motor, and the output shaft of the drive motor 13 is rotatably connected to the threaded screw. The drive motor 13 is a forward and reverse motor and can rotate forward and reverse.

[0041] The upper and lower ends of the transmission screw 24 are rotatably connected to the leaf spring supporting outer cylinder 21 through bearings, and the transmission screw 24 can rotate freely in the leaf spring supporting outer cylinder 21.

[0042] Embodiment 2: Figure 2 , 7 As shown, on the basis of the first embodiment, the straightening assembly 3 includes a straightening shaft 31, the outer wall of the straightening shaft 31 is evenly distributed with at least three straightening rubbers 32, and the straightening shaft 31 is fixedly connected to the leaf spring support outer cylinder 21 through a thread. An armature 33 is provided at the top of the straightening shaft 31. The armature 33 is located at the top of the scraper device. When the scraper device falls, a permanent magnet can be inserted into the drill rod to attract the armature 33, thereby pulling out the scraper device.

[0043] Embodiment 3: Figure 1-2 As shown, on the basis of the first or second embodiment, the scraper assembly 4 includes a scraper shaft 41 threadedly fixedly connected to the bottom of the fixed cylinder 1, and three layers of scraper rubber 42 are evenly distributed on the scraper shaft 41, and openings are evenly distributed on the scraper rubber 42, and the openings on the three layers of the scraper rubber 42 are staggered. The design of the three layers of scraper rubber 42 can improve the scraping effect, and the design of the openings and the staggered arrangement of the openings are conducive to reducing the scraping resistance without affecting the scraping effect, thereby improving the scraping efficiency.

[0044] It should be noted that the lower part of the scraper shaft 41 is fixedly connected to a guide head 43, a counterweight block 44 is sleeved on the guide head 43, and the configuration block is fixedly mounted on the guide head 43 by a fixing bolt 45. The design of the configuration block moves the entire center of gravity of the scraper device downward, making it fall more smoothly, and the configuration block can be increased or decreased according to the density of the mud to obtain a better falling speed and scraper effect.

[0045] Embodiment 4: Based on Embodiment 1, a Hall sensor is installed inside the leaf spring 23, and the leaf spring 23 is a beryllium bronze leaf spring. The Hall sensor on the leaf spring 23 records the retraction of the leaf spring 23 when passing through the shoulder of the drill rod coupling, thereby calculating the number of times the scraper device passes through the drill rod and estimating the position of the scraper device. The Hall sensor is set at the minimum retraction position of the leaf spring 23 each time the scraper device passes through the shoulder of the drill rod coupling, so that it can trigger the Hall sensor and count the number of drill rods.

[0046] It should be noted that a safety valve or a constant pressure break film is provided on the fixed cylinder 1. It is suitable for when the scraper device accidentally falls into the bottom of the well, the bottom of the well has a high pressure environment, the constant pressure break film is damaged or the safety valve automatically opens under the action of pressure, and mud enters the fixed cylinder 1, balancing the pressure inside and outside the fixed cylinder 1, keeping the fixed cylinder 1 intact, and preventing the fixed cylinder 1 from deforming and blocking the water eye.

[0047] It can effectively clean the mud on the inner wall of the drill pipe, and through the telescopic design of the leaf spring, the scraper device can be braked and fixed in the drill pipe, so that the scraper speed is controllable and can adapt to the changes of the drill pipe coupling shoulder.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A leaf spring type drill pipe inner wall scraper device, Features: It comprises a fixed cylinder (1), a leaf spring brake assembly (2) is arranged at the upper end of the fixed cylinder (1), a control assembly is arranged inside the fixed cylinder (1), a straightening assembly (3) is arranged at the upper end of the leaf spring brake assembly (2), and a mud scraping assembly (4) is arranged at the lower end of the fixed cylinder (1); The leaf spring brake assembly (2) comprises a leaf spring support outer cylinder (21), the side wall of the leaf spring support outer cylinder (21) is provided with three leaf spring extension grooves (22), each of the leaf spring extension grooves (22) is provided with a leaf spring leaf (23), a transmission screw (24) is rotatably mounted in the middle of the leaf spring support outer cylinder (21), the transmission screw (24) is coaxially arranged with the leaf spring support outer cylinder (21), a wedge-shaped slider (25) is threadedly sleeved on the transmission screw (24), the transmission screw (24) rotates to drive the wedge-shaped slider (25) to slide up and down on the transmission screw (24), the wedge-shaped slider (25) drives the leaf spring leaf (23) to deform, and the lower part of the leaf spring support outer cylinder (21) is threadedly fixedly connected to the top of the fixed cylinder (1); The control assembly comprises a battery (11), a control circuit board (12) and a drive motor (13) which are arranged in sequence from bottom to top in the fixed cylinder (1); the drive motor (13) is transmission-connected to a transmission screw (24); the control circuit board (12) and the drive motor (13) are electrically connected to the battery (11); and the control circuit board (12) is used to control the rotation of the drive motor (13).

2. The leaf spring drill pipe inner wall scraping device according to claim 1, Features: A boss (231) is provided in the middle of the inner side of the leaf spring (23), and the boss (231) is adapted to the outer shape of the wedge-shaped slider (25). Limiting shafts (232) are provided at both ends of the leaf spring (23), and limiting grooves (221) are provided at both ends of the leaf spring extension groove (22), and the limiting shaft (232) is located in the corresponding limiting groove.

3. The leaf spring drill pipe inner wall scraping device according to claim 1, Features: The drive motor (13) is a planetary DC reduction motor, and the output shaft of the drive motor (13) is rotationally connected to the screw rod.

4. The leaf spring type drill pipe inner wall scraping device according to claim 1, Features: The upper and lower ends of the transmission screw rod (24) are rotatably connected to the leaf spring supporting outer cylinder (21) via bearings.

5. The leaf spring drill pipe inner wall scraping device according to claim 1, Features: The righting assembly (3) comprises a righting shaft (31), the outer wall of the righting shaft (31) is evenly distributed with at least three pieces of righting rubber (32), and the righting shaft (31) is fixedly connected to the leaf spring support outer cylinder (21) via a thread.

6. The leaf spring type drill pipe inner wall scraping device according to claim 5, Features: An armature (33) is provided at the top end of the straightening shaft (31).

7. The leaf spring drill pipe inner wall scraping device according to claim 1, Features: The scraper assembly (4) comprises a scraper shaft (41) threadedly fixedly connected to the bottom of the fixed cylinder (1); three layers of scraper rubber (42) are evenly distributed on the scraper shaft (41); openings are evenly distributed on the scraper rubber (42); and the openings on the three layers of scraper rubber (42) are staggered.

8. The leaf spring type drill pipe inner wall scraping device according to claim 7, Features: The lower part of the scraper shaft (41) is fixedly connected with a guide head (43), a counterweight block (44) is sleeved on the guide head (43), and the counterweight block is fixedly mounted on the guide head (43) by means of fixing bolts (45).

9. The leaf spring drill pipe inner wall scraping device according to claim 1, Features: A Hall sensor is installed inside the leaf spring (23), and the leaf spring (23) is a beryllium bronze leaf spring.

10. The leaf spring drill pipe inner wall scraping device according to claim 1, Features: The fixed cylinder (1) is provided with a safety valve or a constant pressure break film.

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