Automatic scraper for drill pipe

Abstract

The present invention relates to an automatic scraper for a drill pipe, comprising a mounting chassis capable of detachably mounting the scraper on a turntable for drilling, a support body slidably arranged on the mounting chassis, a turntable body rotatably arranged inside the support body, and a scraper disc assembly drivingly connected to the turntable body to move with the turntable body. When scraping mud from the drill pipe, the turntable body drives the scraper disc assembly to close so that the center of the scraper disc assembly is always located on the axis of the drill pipe. The scraper disc assembly includes a straightening mechanism that can abut against the drill pipe under the drive of the turntable body, the straightening mechanism is located at the upper part of the scraper disc assembly, and the straightening mechanism can drive the scraper disc assembly to move so that the scraper disc assembly is coaxially arranged with the drill pipe, so that the scraping of mud is uniform and uneven force does not occur, thereby improving the scraping effect of the scraper disc.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling, in particular to an automatic mud scraper for a drill pipe. Background Art

[0002] When drilling for oil, it is often necessary to lift the drilling pipe (i.e., drill pipe) from the wellbore to the ground (i.e., pull out the drill). Since mud is attached to the outer wall of the drill pipe, during the pull out process, the mud attached to the outer wall of the drill pipe will slowly flow down along the pipe, causing the mud to drip onto the oil drilling platform, the tools on the drilling platform, or the drilling workers, further causing the drilling platform to become slippery, affecting operational safety and environmental pollution.

[0003] In order to solve the problem that the mud on the outer wall of the drill pipe drips onto the drilling platform, the tools on the drilling platform or the drilling workers during the process of pulling the drill pipe out of the hole, various scrapers for scraping the mud on the outer wall of the drill pipe have emerged in recent years as the safety and environmental protection of drilling operations have been paid more attention. The scraper needs to be set at the turntable. When the drill pipe is drilling downward, the scraper needs to be moved away from the turntable to ensure the normal downward drilling of the drill pipe. However, when the drill pipe stops working and is lifted upward, the scraper needs to be moved back to the opening of the turntable to scrape the mud from the drill pipe.

[0004] Existing scrapers generally use three methods to remove mud from the outer wall of the drill pipe:

[0005] The first type of scraper is a rubber scraper, which is an integral annular structure. Before the rubber scraper is used for scraping mud, the drill bit needs to be removed before drilling, and then the rubber scraper needs to be put on the drill bit, and then the square tile on the turntable is lifted and the rubber scraper is sent to the bottom of the turntable. This type of scraper is inconvenient to install, wears quickly, consumes a lot, and is costly.

[0006] The second type of scraper is an automatic scraper that uses compressed air blowing. The scraper is a ring-shaped structure. The compressed air blowing scraper is set under the turntable, and its inner ring is not in direct contact with the outer wall of the drill pipe. Therefore, it is a one-time installation, and the setting position will not affect the normal drilling of the drill pipe. By arranging multiple nozzles on the inner ring of the scraper and spraying a large amount of compressed air through the air compressor, a huge load is brought to the air compressor of the drilling team. Moreover, if the nozzle is too far away from the drill bit, the air impact force is insufficient, and if the nozzle is too close, it is easy to be blocked by mud. The effect is not ideal for oil-based mud with high viscosity.

[0007] The third type of scraper is a clamp-type scraper, which consists of two completely symmetrical scraper blades and is also installed under the drill table in a one-time manner. The scraper blades on both sides are driven pneumatically or hydraulically. Depending on whether the drill is started, the scraper blades move toward or away from the drill tool along a fixed track. However, this type of scraper has poor adaptability when the drill rod is not centered, which leads to uneven scraping of the scraper. Summary of the invention

[0008] 1. Technical issues to be resolved

[0009] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an automatic mud scraper for a drill pipe, which solves the technical problems of the three existing mud scrapers, namely, inconvenient installation, unsatisfactory mud removal effect and uneven mud scraping.

[0010] (II) Technical solution

[0011] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0012] An automatic mud scraper for a drill pipe, comprising a mounting chassis capable of detachably mounting the mud scraper on a rotary table for drilling, a support body slidably arranged on the mounting chassis, a turntable body rotatably arranged inside the support body, and a mud scraper disc assembly drivingly connected to the turntable body to move with the movement of the turntable body;

[0013] When scraping mud from the drill pipe, the rotary table body drives the scraper disc assembly to close, so that the center of the scraper disc assembly is always located on the axis of the drill pipe;

[0014] The scraper disc assembly includes a straightening mechanism that can abut against the drill rod under the drive of the turntable body. The straightening mechanism is located at the upper part of the scraper disc assembly. The straightening mechanism can drive the scraper disc assembly to move so that the scraper disc assembly is coaxially arranged with the drill rod.

[0015] Optionally, the scraper disc assembly further comprises a scraper disc body, and the scraper disc body comprises two first scraper disc assemblies and a second scraper disc assembly symmetrically arranged on both sides of the drill pipe;

[0016] The first scraper disc assembly and the second scraper disc assembly are respectively connected to two driving members; the first scraper disc assembly and the second scraper disc assembly intersect with each other and are both hinged to the turntable body; the first scraper disc assembly and the second scraper disc assembly can be opened or closed along the hinge point toward or away from the drill rod under the drive of the driving member; when the first scraper disc assembly and the second scraper disc assembly are relatively closed, the inner walls of the first scraper disc assembly and the second scraper disc assembly are in contact with the outer wall of the drill rod.

[0017] Optionally, the righting mechanism comprises: two symmetrically arranged righting bodies;

[0018] One of the righting bodies is arranged on the first scraping disc assembly, and the other righting body is arranged on the second scraping disc assembly;

[0019] The righting body comprises a righting wheel support and a righting wheel unit arranged on the righting wheel support;

[0020] The straightening wheel support is detachably connected to the first scraper disc assembly and the second scraper disc assembly respectively, the straightening wheel unit is hinged on the straightening wheel support, and the straightening wheel unit can abut against the drill rod to press the drill rod.

[0021] Optionally, the mounting chassis comprises a first arm, a crossbeam and a second arm;

[0022] The first support arm and the second support arm are symmetrically arranged at two ends of the cross beam, and the first support arm, the cross beam and the second support arm are integrally formed to enclose and form a mounting chassis with an open opening;

[0023] The first support arm and the second support arm have mounting holes at one end away from the cross beam, which can be used to mount the mounting chassis on the rotary table of the drilling well;

[0024] The crossbeam is provided with a slide rail which enables the support body to be slidably arranged on the mounting chassis.

[0025] Optionally, the angles between the first support arm, the second support arm and the crossbeam are both in the range of 135° to 150°.

[0026] Optionally, the support body includes: a bottom plate, a top plate arranged parallel to the bottom plate, and a side plate arranged vertically between the bottom plate and the top plate, the bottom plate, the top plate and the side plates are mutually surrounded to form a mounting shell with an opening, and the turntable body is arranged in the mounting shell; a slide rail seat matching the slide rail is arranged at the bottom of the mounting shell.

[0027] Optionally, the turntable body is a circular ring-shaped structural member, the turntable body has a rotation center, and the turntable body is connected to the support body via a rotating pin; the driving member has a connecting end and a driving end, the connecting ends are hinged to the turntable body, and the driving ends are respectively hinged to the first scraper disc assembly and the second scraper disc assembly.

[0028] Optionally, the turntable body can rotate freely within a rotation angle range of ±10° along the rotating pin.

[0029] Optionally, the first scraper disc assembly comprises a first connecting arm, a first semi-annular member, a first scraper blade and a second scraper blade disposed on the inner ring of the first semi-annular member, and the first scraper blade and the second scraper blade are arranged in upper and lower layers;

[0030] The second scraper disc assembly includes a second connecting arm, a second semi-annular member, a third scraper blade and a fourth scraper blade disposed on the inner ring of the second semi-annular member;

[0031] One end of the first connecting arm is fixed to the first semi-annular member, and one end of the second connecting arm is fixed to the second semi-annular member; the other end of the first connecting arm intersects with the other end of the second connecting arm and is hinged to the turntable body;

[0032] The first scraper blade and the third scraper blade are in the same plane, and the two can form a top annular scraper blade, and the inner ring of the top annular scraper blade abuts against the drill rod;

[0033] The second scraper blade and the fourth scraper blade are in the same plane, and the two can form a bottom annular scraper blade, and the inner ring of the bottom annular scraper blade abuts against the drill rod.

[0034] Optionally, the first scraper blade and the fourth scraper blade have the same size, both being two-fifths of the annular scraper blade; the second scraper blade and the third scraper blade have the same size, both being three-fifths of the annular scraper blade.

[0035] (III) Beneficial effects

[0036] The beneficial effects of the present invention are as follows: an automatic scraper for a drill pipe of the present invention has a mounting chassis that can be detachably mounted on a drilling turntable, and a support body that is slidably arranged on the mounting chassis, and a turntable body that is rotatably arranged on the support body, and the turntable body moves relative to the mounting chassis along with the support body while rotating, and then the turntable body drives the scraper disc assembly connected thereto to move forward and backward and rotate freely within a limited range. Moreover, the straightening mechanism can drive the scraper disc assembly to move so that the scraper disc assembly is coaxially arranged with the drill pipe, so that the scraping is uniform, and uneven force will not occur, thereby improving the scraping effect of the scraper disc. Moreover, the pneumatic control valve remotely controls the switch of the drive component of the scraper, and can also be connected to the intelligent control system for interlocking linkage. It effectively reduces the labor intensity of workers on the drilling platform and reduces the risk of personnel operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional schematic diagram of the automatic scraper for a drill rod of the present invention;

[0038] Figure 2 for Figure 1A top view of the support and a partial cross-sectional schematic diagram of the support body;

[0039] Figure 3 It is a partial cross-sectional schematic diagram of the scraper plate assembly and the second scraper plate assembly of the automatic scraper for drill pipe of the present invention;

[0040] Figure 4 for Figure 3 Schematic diagram of the left side;

[0041] Figure 5 for Figure 3 Schematic diagram of the cross section along BB.

[0042] [Description of Reference Numerals]

[0043] 1: mounting chassis; 11: first arm; 12: crossbeam; 13: second arm; 14: mounting hole; 15: slide rail; 16: spring mounting pin; 2: support body; 21: bottom plate; 22: top plate; 23: side plate; 24: slide rail seat; 3: turntable body; 4: scraper plate assembly; 41: first scraper plate assembly; 411: first connecting arm; 412: first semi-ring member; 413: first scraper blade; 414: second scraper blade; 42 : Second scraper disc assembly; 421: Second connecting arm; 422: Second semi-annular member; 423: Third scraper blade; 424: Fourth scraper blade; 43: Righting body; 431: Righting wheel support; 432: Mounting bracket; 433: Righting wheel; 5: Driving member; 6: Rotating pin; 7: Return spring; 8: Rotating pin; 9: Partition; 100: First cylinder pin; 200: Second cylinder pin; 300: Buckle; 400: Hinge. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below with reference to the accompanying drawings and through specific embodiments. Figure 1 The orientation of is used as a reference. The side where the mounting chassis 1 is located is defined as "downward". The end of the tank body close to the scraper plate assembly 4 in the length direction is defined as "rear". The side where the first arm 11 is located is defined as "left".

[0045] A mounting chassis 1 capable of detachably mounting a scraper on a rotary table of a drilling well, a support body 2 slidably arranged on the mounting chassis 1, a turntable body 3 rotatably arranged inside the support body 2, and a scraper disc assembly 4 drivingly connected to the turntable body 3 to move with the turntable body 3;

[0046] When scraping mud from the drill pipe, the rotary table body 3 drives the scraper disc assembly 4 to close, so that the center of the scraper disc assembly 4 is always located on the axis of the drill pipe.

[0047] The scraper disc assembly 4 includes a straightening mechanism that can abut against the drill rod under the drive of the turntable body 3. The straightening mechanism is located at the upper part of the scraper disc assembly 4. The straightening mechanism can drive the scraper disc assembly 4 to move so that the scraper disc assembly 4 is coaxially arranged with the drill rod.

[0048] The present invention discloses an automatic scraper for a drill pipe, wherein a mounting chassis 1 is detachably mounted on a turntable of a well, and a support body 2 is slidably mounted on the mounting chassis 1, and a turntable body 3 is rotatably mounted on the support body 2. The turntable body 3 moves relative to the mounting chassis 1 along with the support body 2 while rotating, and then the turntable body 3 drives the scraper disc assembly connected thereto to move forward and backward and rotate freely within a limited range. The turntable body 3 is drivingly connected to the scraper disc assembly 4, driving the scraper disc assembly 4 to open or close, and a straightening mechanism is arranged on the scraper disc assembly 4, and then the scraper disc assembly 4 drives the straightening mechanism thereon to open or close accordingly; accordingly, the straightening mechanism contacts the drill pipe when closed, and when the drill pipe deviates, the straightening mechanism can drive the scraper disc assembly 4 to move accordingly, so that the scraper disc assembly 4 is coaxially arranged with the drill pipe, so that the scraping is uniform, and there is no uneven force phenomenon, thereby improving the scraping effect of the scraper disc.

[0049] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0050] Reference Figure 1-2 As shown, an automatic scraper for drill pipes according to an embodiment of the present invention can be directly mounted on a rotary table for drilling. The scraper provided in this embodiment includes a mounting chassis 1, a support body 2, a rotary table body 3 and a scraper disc assembly 4.

[0051] The mounting chassis 1 cooperates with the support body 2 so that the support body 2 can perform reciprocating linear motion along the front-rear direction relative to the mounting chassis 1 .

[0052] Further, see Figure 2 As shown, the mounting chassis 1 includes a first support arm 11 , a cross beam 12 and a second support arm 13 .

[0053] The first arm 11 and the second arm 13 are symmetrically arranged at the two ends of the cross beam 12, and the first arm 11, the cross beam 12 and the second arm 13 are integrally formed to enclose a mounting chassis 1 with an opening. The mud scraper plate assembly 4 can be placed at the opening.

[0054] The first arm 11 and the second arm 13 are both provided with mounting holes 14 that match the fixing holes on the turntable at one end away from the crossbeam 12. The mounting holes 14 are detachably mounted on the turntable plane using a quick connector, and the above quick mounting method facilitates removal, installation and maintenance under different working conditions.

[0055] The mounting chassis 1 can be installed on the drilling turntable at one time through the mounting holes 14 on the first arm 11 and the second arm 13, which is convenient for installation, disassembly and replacement; and the scraper plate assembly 4 is arranged in the open area formed by the first arm 11, the cross beam 12 and the second arm 13, which not only reasonably utilizes the space on the turntable, but also the first arm 11 and the second arm 13 can provide good support and protection for the scraper plate assembly 4.

[0056] It should be noted that the one-time installation means that the mounting chassis 1 is detachably fixed to the turntable through a quick connector, and when in use, the turntable main platform 3 drives the scraper assembly 4 to close close to the outer wall of the drill pipe, and when not in use, the turntable main body 3 drives the scraper assembly 4 to open away from the outer wall of the drill pipe, which will not affect the work of the drill pipe. It is not necessary to remove the square tile and then remove the drilling tool when using it, and then put the rubber mounting ring under the turntable.

[0057] Furthermore, the angles between the first arm 11 and the second arm 13 of the mounting chassis 1 and the crossbeam 12 are in the range of 135° to 150°. The appearance is more beautiful while ensuring the movement of the scraper disc assembly 4, and the installation and maintenance of the scraper disc assembly 4 are convenient.

[0058] A groove is provided downwardly at the center of the upper surface of the crossbeam 12 , and slide rails 15 are provided on both sides of the groove along the length direction (front and rear direction) of the groove. The slide rails 15 can provide a sliding platform for the support body 2 so that the support body 2 can reciprocate back and forth on the slide rails 15 .

[0059] Furthermore, the support body 2 includes a bottom plate 21, a top plate 22 arranged parallel to the bottom plate 21, and a side plate 23 arranged vertically between the bottom plate 21 and the top plate 22. The bottom plate 21, the top plate 22 and the side plate 23 mutually enclose an installation shell with an opening, and the turntable body 3 is arranged in the installation shell; a slide rail seat 24 matching the slide rail 15 is arranged at the bottom of the installation shell.

[0060] It should be noted that a plurality of circular through holes of different sizes are provided on the bottom plate 21 for installing the air pipe adapter connected to the turntable body 3 and reducing the weight of the bottom plate 21. A through hole is provided on the bottom plate 21 to facilitate observation of the movement of the slide rail seat 24 and the slide rail 15 below the bottom plate 21. A plurality of long strip through holes are provided on the side plate 23. The purpose of the long strip through holes is to facilitate installation of the air pipe connected to the turntable body 3 and observation of the working process of the turntable body 3 in the installation shell, so as to facilitate subsequent maintenance and replacement. Among them, the shape of the installation shell is adapted to the installation base 1, so that the support body 2 can slide back and forth on the installation base 1 better.

[0061] It also includes a return spring 7, which is arranged in the groove body of the cross beam 12, and the return spring 7 is fixed on the spring mounting pin 16 arranged in the front and rear directions on the mounting base 1. One end of the return spring 7 is connected to the support body 2, and the other end is connected to the mounting base 1. Through a group of return springs 7, the support body 2 tends to the standby position.

[0062] During the drilling operation, the drill rod is often not centered and there is relatively large shaking. The support body 2 is connected to the mounting base 1 and slides forward and backward through the slide rail to compensate for the displacement of the drill rod in the forward and backward directions.

[0063] The turntable body 3 is arranged inside the support body 2 , and driving components 5 are respectively arranged on both sides of the turntable body 3 .

[0064] It should be noted that a general gas source access port is provided on the mounting chassis 1 , and the gas pipeline passes through the gas pipeline adapter on the support body 2 and is then connected to the driving member 5 on the turntable body 3 to provide power for the driving member 5 .

[0065] Furthermore, the turntable body 3 is a circular ring-shaped structural component, the turntable body 3 has a rotation center, and the turntable body 3 is connected to the support body 2 through a rotating pin 6 .

[0066] It should be noted that during the drilling operation, the drill rod is often not centered and there is relatively large shaking. The rotation of the turntable body 3 can provide displacement compensation in the left and right directions so that the center of the scraper disc assembly 4 is always located on the axis of the drill rod, thereby further improving the scraping effect.

[0067] In this embodiment, the driving member 5 is a cylinder. One end of the two driving members 5 is connected to the turntable body 3 through the first cylinder pin 100, and the other end of the driving member 5 is connected to the two ends of the scraper plate assembly 4 through the second cylinder pin 200. The driving member 5 is ensured to work, and the first scraper plate assembly 41 and the second scraper plate assembly 42 driven by the two driving members 5 are ensured to be opened and closed.

[0068] Specifically, the driving member 5 has a connecting end and a driving end. The connecting end is hinged to the turntable body 3 , and the driving end is hinged to the first scraper disc assembly 41 and the second scraper disc assembly 42 , respectively.

[0069] Furthermore, the turntable body 3 can rotate freely along the rotation angle of the rotation pin 6 within a range of ±10°.

[0070] See also Figure 3 and Figure 4 As shown, the scraper plate assembly 4 includes a scraper plate body and a straightening mechanism.

[0071] The scraper disc body includes two symmetrically arranged first scraper disc components 41 and second scraper disc components 42, which are respectively arranged on the left and right sides of the drill pipe. The first scraper disc component 41 is connected to the driving end of the driving member 5 on the left; the second scraper disc component 42 is connected to the driving end of the driving member 5 on the right. The pneumatic control valve is used to remotely control the switch of the driving member of the scraper, and the intelligent control system can also be connected for interlocking. The labor intensity of workers on the drilling floor is effectively reduced, and the risk of personnel operation is reduced.

[0072] The first scraper disc assembly 41 and the second scraper disc assembly 42 intersect with each other and are both hinged to the turntable body 3 .

[0073] Furthermore, the first scraper disc assembly 41 includes a first connecting arm 411, a first semi-annular member 412, a first scraper blade 413 and a second scraper blade 414 arranged on the inner ring of the first semi-annular member 412, wherein the first scraper blade 413 and the second scraper blade 414 are arranged in upper and lower layers on the inner ring of the first semi-annular member 412.

[0074] The second scraper disc assembly 42 includes a second connecting arm 421 , a second semi-annular member 422 , a third scraper blade 423 and a fourth scraper blade 424 disposed on the inner circle of the second semi-annular member 422 .

[0075] The third scraper blade 423 and the fourth scraper blade 424 are arranged in upper and lower layers on the inner ring of the second semi-annular member 422 .

[0076] Specifically, one end of the first connecting arm 411 is fixedly welded to the first semi-ring-shaped member 412, and one end of the second connecting arm 421 is fixedly welded to the second semi-ring-shaped member 422. The other end of the first connecting arm 411 intersects with the other end of the second connecting arm 421 and is hinged to the turntable body 3 through the rotating pin 8. When the first scraping disc assembly 41 and the second scraping disc assembly 42 need to be opened or closed, the first scraping disc assembly 41 and the second scraping disc assembly 42 are rotated along the rotating pin 8 under the drive of the driving member 5, and the first scraping disc assembly 41 and the second scraping disc assembly 42 rotate within a range of 30°-60°.

[0077] The first scraper blade 413 and the third scraper blade 423 are in the same plane, and the two can form a top annular scraper blade arranged on the upper layer, and the inner ring of the top annular scraper blade abuts against the drill rod.

[0078] The second scraper blade 414 and the fourth scraper blade 424 are in the same plane, and the two can form a bottom annular scraper blade of the lower layer, and the inner ring of the bottom annular scraper blade abuts against the drill pipe. The first scraper disc assembly 41 and the second scraper disc assembly 42 cooperate with each other and adopt a double-layer staggered distributed scraper blade arrangement (see Figure 5 As shown in the figure, it is ensured that the scraper of this embodiment can completely cover the outer wall of the drill pipe during operation, so that no scraping mud is missed. The scraper blade is made of composite rubber material, which is low in cost and provides appropriate strength to ensure that the scraper blade can press the outer wall of the drill pipe, and has good wear resistance.

[0079] It should be noted that the above-mentioned setting makes a certain gap between the first scraper blade 413 and the third scraper blade 423 of the upper layer. When scraping mud from the outer wall of the drill pipe, the scraper blade needs to be close to the drill pipe, so the two scrapers will be close to each other, but when they are close, the scraper blade at the gap between the two scrapers will protrude upward, resulting in the phenomenon that the mud in the gap cannot be scraped cleanly. Then the gap between the second scraper blade 414 and the fourth scraper blade 424 of the bottom layer is not in the same vertical line as the upper layer. Therefore, when the scraping is not in place at the gap of the upper layer, the scraper blade of the lower layer can still scrape. Therefore, the purpose of the staggered setting is to improve the scraping effect of the scraper blade.

[0080] The first scraper disc assembly 41 and the second scraper disc assembly 42 can be opened or closed along the hinge point toward or away from the drill rod under the drive of the driving member 5. When the first scraper disc assembly 41 and the second scraper disc assembly 42 are relatively closed, the inner walls of the first scraper disc assembly 41 and the second scraper disc assembly 42 are in contact with the outer wall of the drill rod, so that the first scraper blade 413 of the first scraper disc assembly 41 and the third scraper blade 423 of the second scraper disc assembly 42 are in contact with the outer wall of the drill rod for a circle to scrape the mud from the drill rod. The second scraper blade 414 of the first scraper disc assembly 41 and the fourth scraper blade 424 of the second scraper disc assembly 42 are in contact with the outer wall of the drill rod for a circle to further scrape the mud from the drill rod.

[0081] Furthermore, the first scraper blade 413 and the fourth scraper blade 424 have the same size, both of which are two-fifths of the annular scraper blade. The second scraper blade 414 and the third scraper blade 423 have the same size, both of which are three-fifths of the annular scraper blade. This facilitates installation on the first semi-annular member 412 and the second semi-annular member 422, while ensuring the scraping effect.

[0082] Furthermore, the bottoms of the first semi-annular member 412 and the second semi-annular member 422 are inwardly facing each other to form a scraper pan chassis, and also include a scraper blade partition 9, and the scraper blade partition 9 is embedded between the scraper pan chassis and the straightening wheel support 431.

[0083] The straightening mechanism includes two symmetrical straightening bodies 43 respectively arranged on the first scraping disc assembly 41 and the second scraping disc assembly 42. The straightening bodies 43 are respectively detachably connected to the first scraping disc assembly 41 and the second scraping disc assembly 42 through connecting pins. The two straightening bodies 43 can respectively move with the first scraping disc assembly 41 and the second scraping disc assembly 42 to clamp the drill rod. The straightening bodies 43 can also drive the first scraping disc assembly 41 and the second scraping disc assembly 42 to move with the deviation of the drill rod, so that the axis of the first scraping disc assembly 41 and the second scraping disc assembly 42 is the same axis as the axis of the drill rod.

[0084] The present invention provides an automatic scraper for a drill pipe, wherein a driving member provides a closing clamping force when the scraper disc assembly 4 is closed, so that the first scraper disc assembly 41 and the second scraper disc assembly 42 remain closed. The support body 2 and the mounting chassis 1 are connected by a slide rail, so that the support body 2 drives the turntable body 3 connected thereto to move, and then the turntable body 3 drives the scraper disc assembly 4 connected thereto to move forward and backward. The turntable body 3 and the support body 2 are connected by a rotating pin 8, so that the turntable body 3 drives the scraper disc assembly 4 to rotate freely around the rotating pin 8 within a limited range. The freedom in two directions can ultimately make the closed scraper disc assembly move within a certain range of the center of the turntable. The straightening wheel body 43 clamps the drill pipe and straightens and centers it, which can drive the scraper disc assembly 4 to move with the deviation of the drill pipe, and always keeps the scraper disc assembly 4 concentric with the drill pipe, so that the scraping is uniform, and there will be no uneven force phenomenon, thereby improving the scraping effect of the scraper disc.

[0085] Furthermore, the righting body 43 includes two righting wheel supports 431 respectively arranged on the first scraping disc assembly 41 and the second scraping disc assembly 42 , and a righting wheel unit arranged on the righting wheel supports 431 .

[0086] The righting wheel support 431 is detachably connected to the first scraper disc assembly 41 and the second scraper disc assembly 42 via a clamping assembly. The righting wheel unit is hinged to the righting wheel support 431, and the righting wheel unit can abut against the drill rod to press the drill rod.

[0087] It should be noted that the snap-on assembly includes a hinge 400 respectively arranged on the first semi-annular member 412 and the straightening wheel support 431 of the first scraper disc assembly 41 and the second semi-annular member 422 and the straightening wheel support 431 of the second scraper disc assembly 42; and also includes a buckle 300 that cooperates with the hinge 400 to install the straightening wheel support 431 on the first semi-annular member 412 and the second semi-annular member 422.

[0088] Furthermore, the straightening wheel unit includes a mounting bracket 432 hingedly connected to the straightening wheel support 431 through a mounting pin, a torsion spring 434 sleeved on the mounting pin, and a straightening wheel 433 arranged on the mounting bracket 432. The straightening wheel 433 can rotate relative to the mounting bracket 432, and the straightening wheel 433 abuts against the drill rod. The torsion spring 434 pushes the drill rod to be pressed during operation, thereby driving the first scraping disc assembly 41 and the second scraping disc assembly 42 to keep them concentric with the drill rod. The torsion spring 434 can always ensure that the straightening wheel 433 abuts against the drill rod when needed, thereby achieving a better scraping effect.

[0089] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0090] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between 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.

[0091] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0092] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0093] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An automatic scraper for a drill pipe, characterized in that: include A mounting chassis (1) capable of detachably mounting the scraper on a drilling turntable, a support body (2) slidably disposed on the mounting chassis (1), a turntable body (3) rotatably disposed inside the support body (2), and a scraper disc assembly (4) drivingly connected to the turntable body (3) so as to move along with the movement of the turntable body (3); When scraping mud from the drill pipe, the rotary table body (3) drives the scraper disc assembly (4) to close, so that the center of the scraper disc assembly (4) is always located on the axis of the drill pipe; The scraper disc assembly (4) comprises a straightening mechanism capable of abutting against the drill rod under the drive of the turntable body (3); the straightening mechanism is located at the upper part of the scraper disc assembly (4); the straightening mechanism can drive the scraper disc assembly (4) to move, so that the scraper disc assembly (4) is coaxially arranged with the drill rod.

2. The automatic scraper for drill pipe according to claim 1, characterized in that: The scraper disc assembly (4) further comprises a scraper disc body, wherein the scraper disc body comprises two first scraper disc assemblies (41) and a second scraper disc assembly (42) symmetrically arranged on both sides of the drill pipe; The first scraper disc assembly (41) and the second scraper disc assembly (42) are respectively connected to two driving members (5); the first scraper disc assembly (41) and the second scraper disc assembly (42) intersect and are both hinged to the turntable body (3); the first scraper disc assembly (41) and the second scraper disc assembly (42) can be opened or closed along the hinge point toward or away from the drill rod under the drive of the driving member (5); when the first scraper disc assembly (41) and the second scraper disc assembly (42) are relatively closed, the inner walls of the first scraper disc assembly (41) and the second scraper disc assembly (42) are in contact with the outer wall of the drill rod.

3. The automatic scraper for drill pipe according to claim 2, characterized in that: The righting mechanism comprises: two righting bodies (43) arranged symmetrically; One of the righting bodies (43) is arranged on the first scraper disc assembly (41), and the other righting body (43) is arranged on the second scraper disc assembly (42); The righting body (43) comprises a righting wheel support (431) and a righting wheel unit arranged on the righting wheel support (431); The straightening wheel support (431) is detachably connected to the first scraper disc assembly (41) and the second scraper disc assembly (42), respectively; the straightening wheel unit is hinged to the straightening wheel support (431); and the straightening wheel unit can abut against the drill rod to press the drill rod.

4. The automatic scraper for drill pipe according to claim 1, characterized in that: The mounting chassis (1) comprises a first support arm (11), a crossbeam (12) and a second support arm (13); The first support arm (11) and the second support arm (13) are symmetrically arranged at two ends of the cross beam (12), and the first support arm (11), the cross beam (12) and the second support arm (13) are integrally formed to enclose a mounting chassis (1) having an opening; The first support arm (11) and the second support arm (13) have mounting holes (14) at one end away from the crossbeam (12) for mounting the mounting chassis (1) on the rotary table of the drilling well; The crossbeam (12) is provided with a slide rail (15) which enables the support body (2) to be slidably arranged on the mounting chassis (1).

5. The automatic scraper for drill pipe according to claim 4, characterized in that: The included angles between the first support arm (11) and the second support arm (13) and the crossbeam (12) are both in the range of 135° to 150°.

6. The automatic scraper for drill pipe according to claim 4, characterized in that: The support body (2) comprises: a bottom plate (21), a top plate (22) arranged parallel to the bottom plate (21), and a side plate (23) arranged vertically between the bottom plate (21) and the top plate (22); the bottom plate (21), the top plate (22) and the side plate (23) are mutually enclosed to form a mounting shell having an opening, and the turntable body (3) is arranged in the mounting shell; a slide rail seat (24) matching the slide rail (15) is arranged at the bottom of the mounting shell.

7. The automatic scraper for drill pipe according to claim 2, characterized in that: The turntable body (3) is a circular ring-shaped structural member, the turntable body (3) has a rotation center, and the turntable body (3) is connected to the support body (2) via a rotating pin (6); the driving member (5) has a connecting end and a driving end, the connecting ends are hinged to the turntable body (3), and the driving ends are respectively hinged to the first scraper disc assembly (41) and the second scraper disc assembly (42).

8. The automatic scraper for drill pipe according to claim 7, characterized in that: The turntable body (3) can freely rotate along the rotation angle of the rotation pin (6) within a range of ±10°.

9. The automatic scraper for drill pipe according to claim 2, characterized in that: The first scraper disc assembly (41) comprises a first connecting arm (411), a first semi-annular member (412), a first scraper blade (413) and a second scraper blade (414) arranged on the inner circle of the first semi-annular member (412), wherein the first scraper blade (413) and the second scraper blade (414) are arranged in upper and lower layers; The second scraper disc assembly (42) comprises a second connecting arm (421), a second semi-ring-shaped member (422), a third scraper blade (423) and a fourth scraper blade (424) arranged on the inner circle of the second semi-ring-shaped member (422); One end of the first connecting arm (411) is fixed to the first semi-annular member (412), and one end of the second connecting arm (421) is fixed to the second semi-annular member (422); the other end of the first connecting arm (411) intersects with the other end of the second connecting arm (421) and is hinged to the turntable body (3); The first scraper blade (413) and the third scraper blade (423) are on the same plane, and the two can form a top annular scraper blade, and the inner ring of the top annular scraper blade abuts against the drill rod; The second scraper blade (414) and the fourth scraper blade (424) are on the same plane, and the two can form a bottom annular scraper blade, the inner ring of the bottom annular scraper blade abutting against the drill rod.

10. The automatic scraper for drill pipe according to claim 9, characterized in that: The first scraper blade (413) and the fourth scraper blade (424) are of the same size, both being two-fifths of the annular scraper blade; the second scraper blade (414) and the third scraper blade (423) are of the same size, both being three-fifths of the annular scraper blade.

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