Screw thread oiling device

Abstract

The invention belongs to the technical field of petroleum drilling, and particularly relates to a screw thread oiling device. The screw thread oiling device is used for oiling a screw thread at the end of a tubular part and comprises a driving mechanism and an oiling assembly, the driving mechanism is in driving connection with the tubular part, and the driving mechanism drives the screw thread of the tubular part to rotate relative to the oiling assembly, so that the oiling assembly can apply grease to the screw thread in the circumferential direction.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil drilling, and specifically relates to a thread greasing device. Background Art

[0002] For drill pipes, drill collars, casing strings and other pipe strings in oil wells, the process of greasing the threads still needs to be completed manually. Before connecting a stand, the female threads of drill pipes and drill collars are greased manually at the wellhead. The greasing of casing is usually completed on the ground. The casing is placed on the pipe rack and the thread protectors are removed, and the greasing is completed manually.

[0003] The drill pipes, drill collars and casing strings in oil production wells of oilfields are all connected by pipe end threads. In order to lubricate, prevent rust and play a sealing role, a lubricant needs to be applied to the pipe end threads before threading. Especially for deep wells and ultra-deep wells, the workload of thread greasing for casing running operations is relatively large. For many years, the lubricant has been applied to the pipe end threads manually. Manual greasing of threads has problems such as high labor intensity, low work efficiency, uneven greasing, waste of lubricant and environmental pollution. Summary of the Invention

[0004] In view of the above technical problems, the present invention aims to provide a thread greasing device that can replace manual thread greasing.

[0005] According to the present invention, there is provided a thread greasing device for greasing the threads at the end of a tubular member, including a driving mechanism and a greasing assembly. The driving mechanism is drivingly connected to the tubular member, and the driving mechanism drives the threads of the tubular member to rotate relative to the greasing assembly, so that the greasing assembly can apply grease circumferentially on the threads.

[0006] In a specific embodiment, the driving mechanism includes: a fixed frame; two parallel rollers rotatably arranged on the fixed frame, with driven wheels provided at the ends of both rollers; a driving wheel rotatably arranged on the fixed frame, the driving wheel meshing with the two driven wheels; and a driving machine provided on the fixed frame, the driving machine being connected to the driving wheel.

[0007] In a specific embodiment, the driving mechanism further includes a base and a telescopic rod provided on the base, and the fixed frame is arranged at the top of the telescopic rod.

[0008] In a specific embodiment, the greasing assembly includes an oil spraying mechanism and a spray pipe connected to the oil spraying mechanism, and an oil spraying port and a greasing brush are provided at the end of the spray pipe.

[0009] In a specific embodiment, an air inlet is provided on the spray pipe.

[0010] In a specific embodiment, the oiling assembly further includes a jet pipe, and a jet orifice is provided at the end of the jet pipe, and the jet pipe is parallel to the oil spray pipe.

[0011] In a specific embodiment, the oiling assembly further includes a moving frame and a water tank. The oil spray pipe is fixedly arranged on the moving frame, the moving frame is movably arranged on the water tank, and the moving direction of the moving frame is parallel to the length direction of the oil spray pipe.

[0012] In a specific embodiment, a motor is fixedly arranged on the moving frame, a gear is connected to the output end of the motor, and a rack is arranged on the water tank along the moving direction of the moving frame, and the rack meshes with the gear.

[0013] In a specific embodiment, the moving frame includes a fixing member and an adjusting plate movably arranged on the fixing member in the vertical direction, and the fixing member and the adjusting plate are fixed by adjusting bolts.

[0014] In a specific embodiment, the thread oiling device further includes an inclined support frame in contact with the outer wall of the tubular member, and the inclined support frame is configured to be able to adjust the height so as to adjust the inclination angle of the tubular member.

[0015] Compared with the prior art, the advantages of the present application are as follows.

[0016] In the present invention, the tubular member is rotated by the driving mechanism, and only the height of the tubular member relative to the oiling assembly needs to be adjusted so that the oiling assembly can spray or apply grease to the threads of the tubular member, and the entire circumference of the threads can be oiled. With this arrangement, the present invention can be applicable to threads of a variety of different diameters and can be applicable to male threads and female threads at the same time, and is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described below with reference to the accompanying drawings.

[0018] Figure 1 Shows a schematic diagram of an embodiment of a thread oiling device according to the present invention;

[0019] Figure 2 Shows a schematic diagram of an embodiment of the oiling assembly according to the present invention;

[0020] Figure 3 Shows a top view structural schematic diagram of the oiling assembly according to the present invention;

[0021] Figure 4 Shows a side view structural schematic diagram of the oiling assembly according to the present invention;

[0022] Figure 5Shows a front view structural schematic diagram of a drive mechanism according to the present invention;

[0023] Figure 6 Shows a top view structural schematic diagram of a drive mechanism according to the present invention;

[0024] Figure 7 Shows a cross-sectional schematic diagram of a partial structure of a drive mechanism according to the present invention;

[0025] Figure 8 Shows a structural schematic diagram of an oil injection pipe according to the present invention;

[0026] Figure 9 Shows a cross-sectional schematic diagram of an oil injection pipe according to the present invention.

[0027] In the figure:

[0028] 21. Drive mechanism; 211. Base; 212. Telescopic rod; 213. Fixed frame; 214. Roller; 215. Driven wheel; 216. Driving wheel; 217. Driving machine;

[0029] 32. Oil coating assembly; 321. Oil injection pipe; 3211. Oil injection port; 3212. Oil coating brush; 3213. Air inlet; 3214. Oil injection channel; 3215. Air jet channel; 3216. Mixing chamber; 322. Oil injection mechanism; 323. Air injection pipe; 3231. Air jet port; 324. Moving frame; 3241. Fixing member; 3242. Adjusting plate; 3243. Adjusting bolt;

[0030] 325. Motor; 3. Gear; 328. Water tank; 329. Slide rail;

[0031] 33. Inclined support frame; 331. Digital cylinder; 332. Support roller;

[0032] 100. Thread oil coating device.

[0033] In this application, all the drawings are schematic drawings, only used to illustrate the principle of the present invention and are not drawn to actual scale. Detailed implementation manners

[0034] The present invention will be introduced below with reference to the drawings.

[0035] It should be noted that the directional terms or limiting words "upper", "lower", "front", "rear", "left", "right", etc. used in this application are all with reference to the drawings. They do not limit the absolute positions of the components involved, but can vary according to specific situations.

[0036] Figure 1 Shows the structure of the thread oil coating device 100 according to the present invention. AsFigure 1 As shown, the thread greasing device 100 includes a driving mechanism 21 and a greasing assembly 32.

[0037] In this embodiment, two driving mechanisms 21 and two greasing assemblies 32 are provided. Among them, the two driving mechanisms 21 are symmetrically arranged on the left and right sides, and the two greasing assemblies 32 are symmetrically arranged at the left and right end parts of a tubular member (not shown). During the working process, the tubular member is placed on the two driving mechanisms 21. After the driving mechanism 21 is started, it can drive the tubular member to rotate. The greasing assembly 32 is located beside the thread at the end of the tubular member. While the tubular member is rotating, the greasing assembly 32 sprays grease on the thread, so that the grease covers the entire circumferential direction of the thread.

[0038] The present invention greases the thread of the tubular member by rotating the tubular member, which can be applicable to tubular members with different diameters and can be applicable to male threads and female threads at the same time. When it is necessary to grease the male thread, the greasing assembly 32 is arranged on the circumferential outer side of the tubular member, so that the greasing assembly 32 can spray grease onto the male thread. The driving mechanism 21 drives the tubular member to rotate, so that the male thread rotates relative to the greasing assembly 32, and the entire circumferential direction of the male thread is sprayed with grease by the greasing assembly 32. When replacing male threads with different diameters, only the relative position height of the driving mechanism 21 and the greasing assembly 32 needs to be adjusted so that the greasing assembly 32 can spray grease onto the male thread. When it is necessary to grease the female thread, the greasing assembly 32 is inserted into the circumferential inner side of the tubular member, so that the greasing assembly 32 can spray grease onto the female thread. The driving mechanism 21 drives the tubular member to rotate, so that the female thread rotates relative to the greasing assembly 32, and the entire circumferential direction of the female thread is sprayed with grease by the greasing assembly 32. When replacing female threads with different diameters, only the relative position height of the driving mechanism 21 and the greasing assembly 32 needs to be adjusted so that the greasing assembly 32 can spray grease onto the female thread.

[0039] It should be noted that although two driving mechanisms 21 and two greasing assemblies 32 are provided in this embodiment, the protection scope of the present application is not limited thereto. Those skilled in the art can adjust the number of the driving mechanism 21 and the greasing assembly 32 according to the actual situation of the present application.

[0040] In a specific embodiment, specifically, as Figures 5 to 7 shown, the driving mechanism 21 includes a fixed frame 213, rollers 214, a driven wheel 215, a driving wheel 216 and a driving machine 217.

[0041] Among them, the fixed frame 213 is configured as a square housing. Two mutually parallel rollers 214 are rotatably arranged inside the fixed frame 213, and the central axes of the two rollers 214 are located on the same horizontal plane. The gap between the two rollers 214 is smaller than the outer diameter of the tubular member, so that the tubular member can be placed above the two rollers 214. A driven wheel 215 is respectively arranged at the same end of the two rollers 214. The driving wheel 216 is arranged at a position slightly below the middle of the two driven wheels 215. The driving wheel 216 is rotatably connected to the fixed frame 213, and the driving wheel 216 meshes with the two driven wheels 215. The driving machine 217 is fixedly arranged outside the fixed frame 213. The output shaft of the driving machine 217 extends into the inside of the fixed frame 213 and is drivingly connected to the driving wheel 216.

[0042] During the working process, the tubular member is placed above the two rollers 214 under the action of gravity, and the outer wall surface of the tubular member contacts the two rollers 214. After the driving machine 217 is started, it can drive the driving wheel 216 to rotate. The driving wheel 216 then drives the two rollers 214 to rotate through the two driven wheels 215, so that the tubular member rotates.

[0043] Combined Figure 1 、 Figures 5 to 7 ., the driving mechanism 21 further includes a base 211 and a telescopic rod 212. The base 211 is fixedly arranged on the side of the water tank 328. The telescopic rod 212 is arranged in the middle of the base 211, and the central axis of the telescopic rod 212 is arranged in the vertical direction. The fixed frame 213 is fixedly arranged on the top of the telescopic rod 212. During the telescopic process of the telescopic rod 212, it can drive the fixed frame 213 to move relative to the base 211, so as to adjust the height of the two rollers 214. In this embodiment, two driving mechanisms 21 are provided. When the rollers 214 of the two driving mechanisms 21 are at the same height, the tubular member is in a horizontal state; when the rollers 214 of the two driving mechanisms 21 are at different heights, the tubular member is in an inclined state, so as to pour out the water or other impurities in the tubular member to avoid mixing into the grease and affecting the screwing quality of the thread.

[0044] As Figure 1 shown, the thread greasing device 100 further includes an inclined support frame 33. The inclined support frame 33 includes a digital cylinder 331 and a support roller 332 arranged on the top of the digital cylinder 331 for supporting the tubular member. The digital cylinder 331 adjusts the height of the support roller 332. The support roller 332 mainly plays a role in supporting the tubular member. By adjusting the height of the support roller 332, the purpose of adjusting the inclination angle of the tubular member can also be achieved. Further, the specific structure of the inclined support frame 33 is similar to that of the driving mechanism 21, the difference being that the inclined support frame 33 is not provided with a driving machine 217, a driven wheel 215 and a driving wheel 216.

[0045] In a specific embodiment, as Figure 1 and Figure 2 shown, the oiling assembly 32 includes an oil injection mechanism 322 and an oil injection pipe 321 connected to the oil injection mechanism 322. An oil injection port 3211 and an oiling brush 3212 are provided at the end of the oil injection pipe 321.

[0046] In this embodiment, the oil injection mechanism 322 is respectively connected to the oil injection pipes 321 of the left and right oiling assemblies 32 through pipelines. The specific structure of the oil injection mechanism 322 is the prior art and will not be elaborated here.

[0047] Figure 2 For Figure 1 the enlarged schematic diagram of the right oiling assembly 32 in , the oil injection pipe 321 is horizontally arranged in the left - right direction. The oil injection port 3211 is arranged at the left end of the oil injection pipe 321, and the oiling brush 3212 is located on the side of the oil injection pipe 321. The oil injection mechanism 322 is connected to the right end of the oil injection pipe 321 through a pipeline. The oil injection mechanism 322 pumps the grease along the pipeline to the oil injection pipe 321, and finally the grease is ejected from the oil injection port 3211 at the left end of the oil injection pipe 321, so that the grease can be sprayed on the thread of the tubular part. At the same time, the oiling brush 3212 contacts the thread. During the process that the driving mechanism 21 drives the tubular part to rotate, the oil injection pipe 321 sprays the grease in the entire circumferential direction of the thread, and the oiling brush 3212 can smear the thread after spraying the grease, so that the grease is smeared more evenly on the surface of the thread.

[0048] In a preferred embodiment, an air inlet 3213 is provided on the oil injection pipe 321. As Figure 2 shown, the air inlet 3213 is arranged on the side of the oil injection pipe 321. During the working process, the air inlet 3213 is connected to the well - site gas source, and gas can be mixed into the grease in the oil injection pipe 321 through the air inlet 3213, so that the oil - gas mixed fluid is ejected from the oil injection port 3211, and the grease can be more evenly dispersed on the surface of the thread.

[0049] In a specific embodiment, an oil injection channel 3214 and an air injection channel 3215 are provided inside the oil injection pipe 321. As Figure 8 and Figure 9 shown, the size of the oil injection channel 3214 is larger than that of the air injection channel 3215. Among them, the axis of the oil injection channel 3214 coincides with the axis of the oil injection pipe 321, and the oil injection mechanism 322 is connected to the oil injection channel 3214 through a pipeline. A plurality of air injection channels 3215 are arranged radially outside the oil injection channel 3214 and are evenly arranged at intervals in the circumferential direction inside the oil injection pipe 321. The air inlet 3212 is connected to each air injection channel 3215. A mixing chamber 3216 is provided at the end of the oil injection pipe 321 where the oil injection port 3211 is provided. As Figure 8As shown, the right side of the mixing chamber 3216 communicates with the oil injection passage 3214 and the air jet passage 3215, and the left side of the mixing chamber 3216 communicates with the oil injection port 3211. With this arrangement, when the oil injection mechanism 322 transports grease to the mixing chamber 3216 through the pipeline and the oil injection passage 3214, gas also enters each air jet passage 3215 from the air inlet 3212 and then mixes with the grease in the mixing chamber 3216. After the grease and gas are mixed in the mixing chamber 3216, they are ejected through the oil injection port 3211, causing the grease to be ejected in a mist form.

[0050] In a specific embodiment, the number of the air jet passages 3215 is set to twelve.

[0051] In a preferred embodiment, the oiling assembly 32 further includes an air jet pipe 323. The air jet pipe 323 is arranged above the oil injection pipe 321 and is parallel to the oil injection pipe 321. An air jet port 3231 is arranged at the left end of the air jet pipe 323. By providing the air jet pipe 323, the water or other impurities remaining on the thread can be purged, thereby improving the threading quality of the thread.

[0052] In a preferred embodiment, as Figure 1 and Figure 2 shown, the oiling assembly 32 further includes a moving frame 324 and a water tank 328. The oil injection pipe 321 is fixedly arranged on the moving frame 324. The moving frame 324 is movably arranged on the water tank 328, and the moving direction of the moving frame 324 is parallel to the length direction of the oil injection pipe 321. With this arrangement, in combination with Figure 1 , the oil injection pipes 321 of the left and right oiling assemblies 32 in this embodiment can move left and right, so as to be applicable to tubular parts of different lengths.

[0053] Specifically, a slide rail 329 for movably connecting with the water tank 328 is arranged at the bottom of the moving frame 324. Correspondingly, a component for adapting to the slide rail 329 is arranged on the water tank 328.

[0054] In a preferred embodiment, as Figure 2 shown, the air jet port 3231 is located on the left side of the oil injection pipe 321, that is to say, the left end of the air jet pipe 323 extends beyond the left end of the oil injection pipe 321. With this arrangement, after the tubular part is placed on the driving mechanism 21, during the process that the moving frame 324 moves leftward until the oiling brush 3212 contacts the thread of the tubular part, the air jet port 3231 will first pass through the thread to purge the thread, and then the oiling work is carried out. During the process that the air jet port 3231 purges the thread, the tubular part can be set to an inclined state by adjusting the driving mechanism 21 or the height of the inclined support frame 33, which is beneficial to discharging the impurities from the tubular part.

[0055] In a specific embodiment, asFigures 2 to 4 As shown, a motor 325 is fixedly arranged on the moving frame 324, and a gear 3 is connected to the output end of the motor 325. As Figure 4 shown, the motor 325 and the gear 3 are respectively arranged on both sides of the moving frame 324. A rack is arranged on the water tank 328 along the moving direction of the moving frame 324, and the rack meshes with the gear 3. After the motor 325 is started, it can drive the gear 3 to rotate. Under the meshing action of the gear 3 and the rack, the moving frame 324 moves relative to the rack, and further the fuel injection pipe 321 moves relative to the water tank 328.

[0056] In a preferred embodiment, as Figure 2 shown, the moving frame 324 includes a fixing member 3241 and an adjusting plate 3242 movably arranged on the fixing member 3241 in the vertical direction. The fixing member 3241 and the adjusting plate 3242 are fixed by adjusting bolts 3243. The air injection pipe 323 and the fuel injection pipe 321 are both fixedly arranged on the adjusting plate 3242. When the adjusting bolts 3243 are loosened, the adjusting plate 3242 can move in the height direction relative to the fixing member 3241, so as to adjust the heights of the air injection pipe 323 and the fuel injection pipe 321. After the air injection pipe 323 and the fuel injection pipe 321 are adjusted to appropriate heights, tightening the adjusting bolts 3243 can fix the adjusting plate 3242 and the fixing member 3241.

[0057] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0059] Finally, it should be noted that the above are only the preferred embodiments of the present invention and do not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A thread greasing device for greasing the threads at the end of a tubular part, characterized in that, It includes a driving mechanism (21) and an oiling assembly (32). The driving mechanism (21) is drivingly connected to the tubular member. The driving mechanism (21) drives the thread of the tubular member to rotate relative to the oiling assembly (22), so that the oiling assembly (32) can apply grease circumferentially on the thread.

2. The thread greasing device according to claim 1, characterized in that, The driving mechanism (21) includes: A fixed frame (213); Two parallel rollers (214) rotatably arranged on the fixed frame (213), and driven wheels (215) are arranged at the ends of the two rollers (214); A driving wheel (216) rotatably arranged on the fixed frame (213), the driving wheel (216) meshes with the two driven wheels (215); and A driving machine (217) arranged on the fixed frame (213), the driving machine (217) is connected to the driving wheel (216).

3. The thread greasing device according to claim 2, characterized in that, The driving mechanism (21) further includes a base (211) and a telescopic rod (212) arranged on the base (211), and the fixed frame (213) is arranged at the top of the telescopic rod (212).

4. The thread greasing device according to claim 1, characterized in that, The oiling assembly (32) includes an oil spraying mechanism (322) and an oil spraying pipe (321) connected to the oil spraying mechanism (322). An oil spraying port (3211) and an oiling brush (3212) are arranged at the end of the oil spraying pipe (321).

5. The thread greasing device according to claim 4, characterized in that, An air inlet (3213) is arranged on the oil spraying pipe (321).

6. The thread greasing device according to claim 4, characterized in that, The oiling assembly (32) further includes an air spraying pipe (323). An air spraying port (3231) is arranged at the end of the air spraying pipe (323), and the air spraying pipe (323) is parallel to the air spraying pipe (323).

7. The thread greasing device according to claim 4, characterized in that, The oiling assembly (32) further includes a moving frame (324) and a water tank (328). The oil spraying pipe (321) is fixedly arranged on the moving frame (324), the moving frame (324) is movably arranged on the water tank (328), and the moving direction of the moving frame (324) is parallel to the length direction of the oil spraying pipe (321).

8. The thread greasing device according to claim 7, characterized in that, A motor (325) is fixedly arranged on the moving frame (324). A gear (3) is connected to the output end of the motor (325). A rack is arranged on the water tank (328) along the moving direction of the moving frame (324), and the rack meshes with the gear (3).

9. The thread greasing device according to claim 7, characterized in that, The moving frame (324) includes a fixing member (3241) and an adjusting plate (3242) movably arranged vertically on the fixing member (3241), and the fixing member (3241) and the adjusting plate (3242) are fixed by adjusting bolts (3243).

10. The thread greasing device according to any one of claims 1 to 9, characterized in that, The thread oiling device further includes an inclined support frame (33) in contact with the outer wall of the tubular member. The inclined support frame (33) is configured to be able to adjust the height, so as to adjust the inclination angle of the tubular member.

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