CN213175597U - Slurry collecting basin for sealing upper end of top drive main shaft, sealing device and top drive - Google Patents

Abstract

The utility model relates to a slurry collecting basin for sealing the upper end of a top drive main shaft, which comprises an inner wall, an outer wall, a bottom surface and a circular through hole; the inner wall and the outer wall and the bottom surface arranged between the inner wall and the outer wall form an annular groove with a U-shaped cross section; a mud outlet extends outwards from one side of the outer wall. Still provide a sealing device for top drive main shaft upper end, including mud collection basin and mud water conservancy diversion umbrella. The top drive comprises a slurry collecting basin and a slurry guide umbrella, wherein the slurry guide umbrella is connected with a lower nut of the washing pipe device through interference fit; the mud collecting basin is seated on the gear box and is positioned in the bell jar; and the slurry leaked by the washpipe device flows downwards into the slurry collecting basin along the slurry guide umbrella. The utility model discloses simple structure, easy to assemble, cooperation mud water conservancy diversion umbrella constitutes sealing device, and the basin is collected to the leading-in mud of mud that the mud water conservancy diversion umbrella will leak, and the mud of avoiding revealing is piled up inside the bell jar, ensures that mud does not get into the gear box.

Description

Slurry collecting basin for sealing upper end of top drive main shaft, sealing device and top drive

Technical Field

The utility model relates to a petroleum machinery technical field especially relates to a be used for top to drive sealed mud collection basin of main shaft upper end, sealing device and top drive.

Background

The top drive is important equipment for ensuring the operation efficiency and the operation safety of petroleum and natural gas drilling in modern times. The top drive main body structure mainly comprises a lifting ring, a main shaft, a gear box, a drilling motor, a bell jar, a gooseneck, a washpipe device and the like. In drilling operations, the top drive provides torque and rotational speed and control thereof to the downhole drilling tool, while simultaneously providing a rotational path for high pressure, high displacement drilling mud.

The lower end of a top drive main shaft extends out of the lower end of the gear box, a framework oil seal is arranged between the lower portion of the gear box and the main shaft, and the lower end of the main shaft is connected with a downhole drilling tool. The upper end of the main shaft extends out of the upper part of the gearbox cover and is connected with the washing pipe device. The washing pipe device is connected with the upper end of the main shaft and the gooseneck, is a high-pressure rotary channel for drilling mud, has certain mud leakage amount during working, and can cause larger mud leakage when failure occurs. The rotation of the main shaft is controlled by a drilling motor. The bell jar is fixed on the gear box cover, and a gooseneck is fixed above the bell jar and provides an installation interface for the washing pipe device. A slurry umbrella, a grease nipple and an oil seal flange are arranged between the upper end of the main shaft and the gearbox cover. The mud umbrella is used for reducing direct oil seal of mud, and the oil blanket flange provides the oil blanket installation interface, provides regular lubrication for the oil blanket through the grease nipple.

At present, two main top drive structures are designed at home and abroad, the first structure is that the upper end of a main shaft extends out of the upper part of a gearbox cover, a grease nozzle, an oil discharge valve and a lubricating channel are arranged on an oil seal flange, and the oil seal flange is fixed on the gearbox cover through bolts. The upper end of the main shaft is connected with a pipe washing device, and a slurry umbrella is arranged between the pipe washing device and the oil seal flange. A bearing isolation seal, a shaft sleeve and a framework oil seal are arranged between the outer diameter of the upper end of the main shaft and an inner hole of the oil seal flange, so that a closed annular lubricating oil cavity is formed. The lubricating channel is opened in the middle of the closed annular lubricating oil cavity. And secondly, the upper end of the main shaft extends out of the upper parts of the gearbox cover and the bearing thrust flange, a grease nipple and a grease channel are configured on the bearing thrust flange, and the bell jar and the grease seal flange are fixed on the bearing thrust flange through bolts. The upper end of the main shaft is provided with a shaft sleeve in an interference fit mode, and the slurry umbrella is fixed to the upper end of the shaft sleeve through a bolt. And a framework oil seal and a rotary oil seal are arranged on the oil seal flange, so that a closed annular lubricating oil cavity is formed outside the oil seal flange and inside the slurry umbrella. The opening of the lubricating channel is positioned in the middle of the lubricating oil cavity. And a slurry guide umbrella is also arranged between the slurry umbrella and the bearing thrust flange.

No matter which kind of design, even when normal lubrication maintenance, the rotation of main shaft drives the lubricating grease in the annular lubricating oil chamber and continuously cuts, generates heat, volatilizees to annular lubricating oil chamber forms malleation gas storehouse, when the oil blanket can not reach airtight requirement, malleation gas is got rid of from annular lubricating oil chamber. After the main shaft stops rotating, the gas in the annular lubricating oil cavity is cooled, the cavity forms a negative pressure bin, and when slurry is accumulated in the bell jar, the slurry is easily sucked into the annular lubricating oil cavity, so that the corrosion damage to the sealing structure at the upper end of the main shaft is further accelerated.

The rotation and the stop of the top drive main shaft are repeated, more and more slurry accumulated in the bell jar enters the annular lubricating oil cavity, the sealing structure at the upper end of the main shaft is damaged, and finally the slurry enters the gear box.

The mud feeding of the top drive gear box is a main pain point of the existing top drive equipment at home and abroad. The washing pipe device arranged in the bell jar at the upper end of the main shaft is a channel for high-pressure and large-discharge mud during drilling operation. The normal seepage of wash tub device or the puncture when failing all can lead to the fact mud to pile up in bell jar inside, and mud has stronger corrosivity to materials such as metal, damages main shaft upper end seal structure and oil blanket easily, and mud drives main shaft upper end seal structure through the top and gets into the gear box, causes the top and drives equipment trouble and maintenance, will seriously influence oil and gas drilling operation safety and efficiency.

Some existing top drive manufacturers arrange an oil seal flange, a slurry umbrella and two oil seals between a gearbox cover and the upper end of a main shaft, arrange a lubricating oil channel between the oil seals and arrange a lubricating oil nozzle, and lubricate the oil seals through the lubricating oil nozzle and the lubricating oil channel. In addition, some top drive manufacturers set a plurality of oil seals in the main shaft sealing structure, and lubricating grease is adopted for lubrication, so that the effect is not obvious.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In view of prior art's above-mentioned shortcoming, not enough, the utility model provides a be used for top to drive the sealed mud of main shaft upper end and collect basin, sealing device and top and drive, collect the basin through mud, can collect the mud of the normal seepage of wash pipe device or thorn hourglass when inefficacy, avoid the mud of revealing to pile up inside the bell jar, also avoided the mud of revealing to contact with main shaft upper end seal structure and damage sealedly simultaneously, ensure from this that mud does not get into the gear box.

(II) technical scheme

In order to achieve the above object, the utility model discloses a main technical scheme include:

the embodiment of the utility model provides a mud collecting basin for top drive main shaft upper end is sealed, top drive main shaft is located top drive main part inside, mud collecting basin includes inner wall, outer wall, bottom surface and the circular through-hole that is located mud collecting basin center;

the inner wall and the outer wall and the bottom surface arranged between the inner wall and the outer wall form an annular groove with a U-shaped cross section; a slurry outlet is formed in one side of the outer wall in an outward extending mode and used for cleaning slurry, and the circular through hole is defined by the inner wall;

the mud collecting basin is sleeved at the upper end of the top drive main shaft and inside the bell jar to collect mud leaked from the washing pipe device, and the washing pipe device is arranged at the upper end of the top drive main shaft.

Optionally, the bottom of the bottom surface is provided with a plurality of support legs for supporting the mud collection basin.

Optionally, inside the U-shaped annular groove, the bottom surface, the inner wall, and the outer wall form an arc-shaped structure; the height of the inner wall is lower than that of the outer wall; the outside of bottom surface is planar structure, and its outside junction with inner wall and outer wall sets up the chamfer.

Optionally, the slurry outlet is inclined downwards from inside to outside in an inclined manner so as to lead out slurry, and the height of the connection position of the slurry outlet and the bottom surface is equal to the height of the bottom surface.

Optionally, the top drive main shaft is located inside the top drive main body, the sealing device comprises the mud collecting basin and the mud flow guiding umbrella, and the sealing device is sleeved on a pipe flushing device of the top drive main shaft to prevent mud from leaking to a gear box below the pipe flushing device; the circular through hole of the mud collecting basin is sleeved on the washing pipe device.

Optionally, the bottom surface of the mud collection basin is closely attached to the top surface of the gear box at the upper end of the top drive spindle.

Optionally, the slurry guide umbrella is connected with a lower nut of a washing pipe device through interference fit, and the washing pipe device is located at the upper end of the top drive main shaft.

Optionally, the diameter of the inner wall is smaller than the diameter of an outer ring of the slurry diversion umbrella and larger than the diameter of an inner ring of the slurry diversion umbrella.

Optionally, the top end of the inner wall is closely attached to the lower end of the slurry diversion umbrella.

Optionally, the sealing device is arranged at the upper end of the top drive main shaft;

(III) advantageous effects

The utility model has the advantages that: the utility model discloses a be used for top to drive sealed mud collection basin of main shaft upper end, sealing device and top drive, simple structure, easy to assemble, cooperation mud water conservancy diversion umbrella constitutes sealing device, and mud water conservancy diversion umbrella links together with washing pipe device lower nut, and the basin is collected to the leading-in mud of the mud that will leak. The leaked slurry is prevented from being accumulated inside the bell jar, and the leaked slurry is prevented from contacting with the sealing structure at the upper end of the main shaft to damage the sealing structure, so that the slurry is prevented from entering the gear box.

Drawings

Fig. 1 is a schematic view of the sealing device according to the present invention after installation;

fig. 2 is a schematic cross-sectional view of the sealing device according to the present invention after installation;

FIG. 3 is a view of the mud diversion umbrella of FIG. 1 according to the present invention;

figure 4 shows a mud collection basin according to figure 1 of the present invention.

[ description of reference ]

1: a slurry diversion umbrella;

2: a mud collection basin; 21: an inner wall; 22: an outer wall; 23: a bottom surface; 24: a circular through hole; 25: a slurry outlet; 26 support legs;

3: a pipe washing device;

4: a gear case;

5: a bell jar;

6: and (5) a lower nut.

Detailed Description

In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Example (b):

referring to fig. 1-4, a mud collecting basin for sealing the upper end of a top drive main shaft, wherein the top drive main shaft is positioned inside a top drive main body, and a wash pipe device 3 is arranged at the upper end of the main shaft. The mud collection basin 2 comprises an inner wall 21, an outer wall 22, a bottom surface 23 and a circular through hole 24 positioned in the center of the mud collection basin 2;

the inner wall 21 and the outer wall 22 and a bottom surface 23 arranged between the inner wall and the outer wall form an annular groove with a U-shaped cross section; the outer wall 22 is integrally provided with a slurry outlet 25 in an outward extending manner, the slurry outlet 25 inclines downwards from inside to outside, and the height of the joint of the slurry outlet 25 and the bottom surface 23 is equal to the height of the bottom surface 23, so that slurry can be conveniently led out. The inner wall 21 is of an annular structure, a circular through hole 24 is formed in the middle of the inner wall, a reasonable gap is formed between the circular through hole 24 and the outer side of the washpipe device 3 in a concentric mode, the slurry collecting basin 2 in the embodiment is sleeved on the washpipe device 3 driven by the top through hole 24, so that slurry seeped out by the washpipe device 3 is collected and guided out to a slurry outlet 25, slurry accumulation caused by the fact that the washpipe device 3 leaks normally or fails inside the bell jar 5 is avoided, and the washpipe device 3 is arranged at the upper end of the top driving main shaft. The slurry has strong corrosivity to materials such as metal, the sealing structure and the oil seal at the upper end of the main shaft are easily damaged, and the sealing structure is arranged, so that the condition that the slurry enters the gear box through the sealing structure at the upper end of the top drive main shaft to cause top drive equipment failure and maintenance is avoided.

In the U-shaped annular groove, the bottom surface 23, the inner wall 21 and the outer wall 22 form an arc-shaped structure; the outer side of the bottom surface 23 is a plane structure, and the junction between the bottom surface and the outer side of the inner wall 21 and the outer wall 22 is chamfered. The chamfer can be a right angle chamfer, a chamfer with an angle, a circular arc chamfer or the like, so as to be convenient for use.

The bottom of the bottom surface 23 is provided with a number of support legs 26 for supporting the mud collection basin 2.

The top drive main shaft is positioned in the top drive main body, the sealing device comprises the slurry collecting basin 2 and the slurry guide umbrella 1, and the sealing device is sleeved on the washing pipe device 3 of the top drive main shaft to prevent slurry from leaking to the gear box 4 below the washing pipe device 3; the method specifically comprises the following steps: on the washing pipe device 3 was located to the circular through-hole 24 cover of basin 2 is collected to mud, mud water conservancy diversion umbrella 1 sets up in the junction of basin 2 and washing pipe device 3 is collected to mud to form sealedly to above-mentioned junction, avoid the mud of 3 seepage from washing pipe device to leak elsewhere from above-mentioned junction, simultaneously mud water conservancy diversion umbrella 1 also forms the direction to the mud of 3 seepage from washing pipe device, and the mud that leaks flows into mud collection basin 2 completely, prevents effectively that unexpected seepage from appearing.

Further, the supporting legs 26 of the mud collecting basin 2 are closely attached to the top surface of the gear box 4 at the upper end of the top drive spindle. The mud water conservancy diversion umbrella 1 links together through interference fit and lower nut 6 of wash pipe device 3, and wash pipe device 3 is located the top and drives main shaft upper end.

The height of inner wall 21 is less than the height of outer wall 22, and certainly the utility model discloses be not limited to this, the height of inner wall 21 and outer wall 22 can be adjusted as required, and both can vary, also can equal. The diameter of the inner wall 21 is smaller than the diameter of the outer ring of the slurry diversion umbrella 1 and larger than the diameter of the inner ring of the slurry diversion umbrella 1. The top end of the inner wall 21 is tightly attached to the lower end of the slurry guide umbrella 1, so that the slurry is ensured to flow into the slurry collection basin 2 through the slurry guide umbrella 1.

The sealing device is arranged at the upper end of the top drive main shaft;

the structure of the upper end of the top drive main shaft may include the following parts;

the device comprises a slurry collecting basin 2 and a slurry guiding umbrella 1, wherein the slurry guiding umbrella 1 is connected with a lower nut 6 of a washing pipe device 3 through interference fit; the mud collection basin 2 sits on the gear box 4 and is positioned in the bell jar 5; the mud leaked by the washing pipe device 3 flows downwards into the mud collecting basin 2 along the mud flow guiding umbrella 1, and the mud in the mud collecting basin 2 is cleaned regularly.

In conclusion, the mud collecting basin 2 is simple in structure and convenient to install, the sealing device is formed by matching the mud diversion umbrella 1, the mud diversion umbrella 1 is connected with the lower nut 6 of the washing pipe device 3, and leaked mud is guided into the mud collecting basin 2. The leaked slurry is prevented from being accumulated in the bell jar 5, and the leaked slurry is prevented from contacting with the sealing structure at the upper end of the main shaft to damage the sealing structure, so that the slurry is prevented from entering the gear box 4.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that modifications, alterations, substitutions and variations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. The utility model provides a basin is collected to mud that is used for top to drive main shaft upper end sealed, the top is driven the main shaft and is located the top and drive inside the main part, its characterized in that: the mud collection basin (2) comprises an inner wall (21), an outer wall (22), a bottom surface (23) and a circular through hole (24) positioned in the center of the mud collection basin (2);

the inner wall (21) and the outer wall (22) and a bottom surface (23) arranged between the inner wall and the outer wall form an annular groove with a U-shaped cross section; a slurry outlet (25) is formed in one side of the outer wall (22) in an outward extending mode and used for cleaning slurry; the circular through hole (24) is surrounded by an inner wall (21);

the mud collecting basin (2) is sleeved at the upper end of the top drive main shaft and inside the bell jar to collect mud leaked from the washing pipe device (3), and the washing pipe device (3) is arranged at the upper end of the top drive main shaft.

2. A mud collection basin for top drive spindle upper end sealing as claimed in claim 1, wherein: the bottom of bottom surface (23) is provided with a plurality of supporting leg (26), is used for supporting basin (2) is collected to mud.

3. A mud collection basin for top drive spindle upper end sealing as claimed in claim 1, wherein: in the U-shaped annular groove, the bottom surface (23), the inner wall (21) and the outer wall (22) form an arc-shaped structure; the height of the inner wall (21) is lower than that of the outer wall (22); the outer side of the bottom surface (23) is of a plane structure, and the joint of the bottom surface and the outer sides of the inner wall (21) and the outer wall (22) is provided with a fillet or a chamfer.

4. A mud collection basin for top drive spindle upper end sealing as claimed in claim 1, wherein: the slurry outlet (25) is inclined downwards from inside to outside in an inclined mode so as to lead out slurry, and the height of the connection position of the slurry outlet (25) and the bottom surface (23) is equal to the height of the bottom surface (23).

5. The utility model provides a sealing device for top drives main shaft upper end, the top is driven the main shaft and is located the top and drive inside the main part, its characterized in that: the sealing device comprises a mud collecting basin (2) and a mud diversion umbrella (1) as claimed in any one of claims 1 to 4, and is sleeved on a wash pipe device (3) of the top drive main shaft to prevent mud from leaking to a gear box (4) below the wash pipe device (3); the circular through hole (24) of the mud collecting basin (2) is sleeved on the washing pipe device (3).

6. A seal arrangement for the upper end of a top drive spindle according to claim 5, wherein: and the supporting legs (26) of the mud collecting basin (2) are tightly attached to the top surface of the gear box (4) at the upper end of the top drive main shaft.

7. A seal arrangement for the upper end of a top drive spindle according to claim 5, wherein: the slurry guide umbrella (1) is connected with a lower nut (6) of the washing pipe device (3) through interference fit, and the washing pipe device (3) is located at the upper end of the top drive main shaft.

8. A seal arrangement for the upper end of a top drive spindle according to claim 5, wherein: the diameter of the inner wall (21) is smaller than the diameter of the outer ring of the slurry diversion umbrella (1) and larger than the diameter of the inner ring of the slurry diversion umbrella (1).

9. A seal arrangement for the upper end of a top drive spindle according to claim 5, wherein: a gap is arranged between the top end of the inner wall (21) and the lower end surface of the slurry guide umbrella (1).

10. A top drive, characterized in that: a sealing device according to any one of claims 5 to 9 is provided at the upper end of the top drive spindle.

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