CN210622756U - Eccentric wear prevention device for wellhead drilling tool - Google Patents
Eccentric wear prevention device for wellhead drilling tool Download PDFInfo
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- CN210622756U CN210622756U CN201921619134.6U CN201921619134U CN210622756U CN 210622756 U CN210622756 U CN 210622756U CN 201921619134 U CN201921619134 U CN 201921619134U CN 210622756 U CN210622756 U CN 210622756U
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Abstract
The utility model relates to a well head drilling tool eccentric wear prevention device. The wellhead drilling tool eccentric wear prevention device comprises an upper flange, wherein the inner wall of the upper flange is provided with a downward step surface; the inner wall of the lower flange is provided with an upward step surface; the outer wall of the anti-abrasion sleeve is provided with an upper top support surface and a lower top support surface, a first bearing chamber is defined between the upper top support surface and the step surface of the upper flange, and a second bearing chamber is defined between the lower top support surface and the step surface of the lower flange; the first bearing is arranged in the first bearing chamber, the outer ring is in axial stop fit with the step surface of the upper flange, and the inner ring is in axial stop fit with the upper jacking surface of the anti-abrasion sleeve; and the second bearing is arranged in the second bearing chamber, the outer ring is in axial stop fit with the step surface of the lower flange, and the inner ring is in axial stop fit with the lower jacking surface of the anti-abrasion sleeve. In the process of pulling out and putting down the drill string, although the first bearing and the second bearing bear axial force, the first bearing and the second bearing do not axially move relative to the anti-abrasion sleeve or the flange, and therefore the related sealing part cannot be damaged.
Description
Technical Field
The utility model relates to a well head drilling tool eccentric wear prevention device.
Background
During the large workover operation of an oil and gas field, particularly during casing milling and grinding milling, due to various reasons, a drill string in the well is often eccentrically stressed, the drill string is caused to swing violently, so that the inner walls of the drill string and a wellhead blowout preventer are seriously abraded, the service life of the blowout preventer is influenced, and the cost is increased; on the other hand, the strength of the drill column can be reduced, and hidden danger of accidents is caused.
The utility model discloses a utility model patent that grant publication number is CN2135058Y discloses a blowout preventer wear prevention device, and the device has solved the problem of drilling string and the wearing and tearing of well head preventer through installation abrasionproof cover in the flange, the mode of installation bearing between abrasionproof cover and flange. However, because the axial spacing between the anti-wear sleeve and the flange is realized only by the interference fit between the inner ring and the outer ring of the bearing and the anti-wear sleeve and the flange, the bearing is difficult to avoid bearing axial force in the processes of pulling out and putting down the drill string, and then the bearing and one of the anti-wear sleeve and the flange generate axial relative movement, the relative movement can cause the damage of a related sealing part, once the situation occurs, liquid enters the bearing, the bearing can be quickly damaged, and further the anti-wear device fails.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a well head drilling tool eccentric wear prevention device to solve the fragile problem of current wear prevention device.
In order to achieve the purpose, the utility model discloses well head drilling tool eccentric wear prevention device's technical scheme is:
the well head drilling tool eccentric wear prevention device includes: the inner wall of the upper flange is provided with a downward step surface; the inner wall of the lower flange is provided with an upward step surface; the outer wall of the anti-abrasion sleeve is provided with an upper top support surface and a lower top support surface, a first bearing chamber is defined between the upper top support surface and the step surface of the upper flange, and a second bearing chamber is defined between the lower top support surface and the step surface of the lower flange; the first bearing is arranged in the first bearing chamber, the outer ring is in axial stop fit with the step surface of the upper flange, and the inner ring is in axial stop fit with the upper jacking surface of the anti-abrasion sleeve; and the second bearing is arranged in the second bearing chamber, the outer ring is in axial stop fit with the step surface of the lower flange, and the inner ring is in axial stop fit with the lower jacking surface of the anti-abrasion sleeve.
The utility model has the advantages that: the inner ring and the outer ring of the first bearing are in axial stop fit with the anti-wear sleeve and the upper flange, and the inner ring and the outer ring of the second bearing are in axial stop fit with the anti-wear sleeve and the lower flange, so that in the pulling-out process of the drill string, although the first bearing bears axial force, the first bearing does not axially move relative to the anti-wear sleeve or the upper flange, and the related sealing part is not damaged; similarly, in the process of lowering the drill string, although the second bearing bears the axial force, the second bearing does not axially move relative to the anti-abrasion sleeve or the lower flange, and therefore the related sealing part cannot be damaged.
The upper flange is in threaded connection with the lower flange. The upper flange is screwed on the lower flange and the bearing is compressed, so that the bearing is prevented from being damaged due to knocking at multiple parts of the bearing, and the bearing is more convenient to install.
A circumferential sealing ring is arranged between the upper flange and the lower flange to realize circumferential sealing between the upper flange and the lower flange. Avoiding liquid or gas from entering the bearing chamber and damaging the bearing.
The outer wall of the lower flange is provided with external threads, and the upper flange is arranged outside the lower flange in a rotating mode. A structure similar to a hat is formed outside the lower flange, so that the bearing chamber can be better protected, and liquid is not easy to enter the bearing chamber.
The outer part of the wear-resistant sleeve is provided with an annular boss, the upper end face of the annular boss forms the upper top supporting face, and the lower end face of the annular boss forms the lower top supporting face.
The wear sleeve has a projecting portion projecting radially beyond the annular boss, the projecting portion being received in the space between the first and second bearing chambers. Can generate heat in the bearing use, lubricating oil will flow downwards, through setting up the bulge and filling between first bearing room and second bearing room, the position of the lubricating oil of upper portion of keeping that can be better avoids first bearing to be damaged.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an eccentric wear prevention device for a wellhead drilling tool according to the present invention;
FIG. 2 is a schematic structural view of the upper flange of FIG. 1;
FIG. 3 is a schematic structural view of the lower flange of FIG. 1;
FIG. 4 is a schematic structural view of the wear sleeve of FIG. 1;
in the figure: 1-upper flange; 101-a first step surface; 102-a first seal groove; 2-wear-resistant sleeve; 21-an annular boss; 211-upper top-support surface; 212-lower top prop surface; 22-a protruding portion; 3-a first bearing; 4-a second bearing; 5-lower flange; 501-a second step surface; 502-a second seal groove; 61-a first sealing ring; 62-a second seal ring; 63-a third seal ring; 7-bolt holes; 8-steel ring groove.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
The utility model discloses a wellhead drilling tool eccentric wear prevention device's concrete embodiment, as shown in fig. 1 to 4, including last flange 1 and lower flange 5, be equipped with the external screw thread on the outer wall of lower flange 5, go up flange 1 and adorn soon in 5 outsides of lower flange, rotate in the cavity of upper and lower flange and be equipped with abrasionproof cover 2. The outer part of the wear-resistant sleeve 2 is provided with an annular boss 21, the inner wall of the upper flange 1 is provided with a downward first step surface 101, a first bearing chamber is defined between the first step surface 101 and the upper end surface of the annular boss 21, a first bearing 3 is installed in the first bearing chamber, the outer ring of the first bearing 3 is in axial stop fit with the first step surface 101, the inner ring is in axial stop fit with the annular boss 21, and the upper end surface of the annular boss 21 forms an upper jacking surface 211 for jacking the inner ring of the first bearing 3 upwards. The inner wall of the lower flange 5 has an upward second step surface 501, a second bearing chamber is defined between the second step surface 501 and the lower end surface of the annular boss 21, a second bearing 4 is installed in the second bearing chamber, the outer ring of the second bearing 4 is in axial stop fit with the second step surface 501, the inner ring is in axial stop fit with the annular boss 21, and the lower end surface of the annular boss 21 forms a lower jacking surface 212 for jacking the inner ring of the second bearing 4 downwards. The wear sleeve 2 has a projecting portion 22 which projects radially beyond the annular boss 21, the projecting portion 22 being received in the space between the first and second bearing chambers.
In order to prevent liquid from entering the bearing chamber to damage the bearing, the rotating matching surfaces of the anti-abrasion sleeve 2 and the upper flange and the lower flange are respectively provided with a sealing ring. In this embodiment, as shown in fig. 2, a first sealing groove 102 is disposed above the first bearing chamber in the upper flange 1, a first sealing ring 61 is disposed in the first sealing groove 102, and the upper flange 1 and the wear-resistant sleeve 2 are in sealing fit with each other through the first sealing ring 61, so as to prevent liquid from entering the first bearing chamber from above. As shown in fig. 3, a second sealing groove 502 is provided below the second bearing chamber in the lower flange 5, a second sealing ring 62 is provided in the second sealing groove 502, the lower flange 5 and the wear-resistant sleeve 2 are sealed and matched by the second sealing ring 62, and liquid is prevented from entering the second bearing chamber from below. Meanwhile, a third sealing ring 63 is arranged between the upper flange and the lower flange to realize circumferential sealing between the upper flange and the lower flange, so that liquid or gas is prevented from entering the first bearing chamber above the upper flange from the connecting position of the upper flange and the lower flange.
And the upper end surface of the upper flange 1 and the lower end surface of the lower flange 5 are respectively provided with a steel ring groove 8 and a bolt hole 7, when in use, steel rings are correspondingly placed in the steel ring grooves of the upper flange and the lower flange, the lower flange 5 is fixedly connected with the upper flange 1 of the wellhead blowout preventer through bolts, and the upper flange 1 is fixedly connected with the lower flange 5 of the upper diversion tee joint. In the well drilling and repairing operation, when the drilling string swings because of eccentric stress, the drilling string will contact with the inner hole wall of the anti-abrasion sleeve 2 and generate friction, the anti-abrasion sleeve 2 can flexibly rotate under the action of the bearing, the drilling string will rotate together with the anti-abrasion sleeve 2, and because the drilling string is not directly contacted with the inner wall of the blowout preventer, the inner wall of the blowout preventer cannot be abraded, and meanwhile, because the friction between the drilling string and the inner hole wall of the anti-abrasion sleeve 2 is rolling friction, the friction degree is low, and therefore the outer wall of the drilling string cannot be seriously abraded.
The anti-abrasion sleeve 2 is in interference fit with the inner ring of the first bearing 3 and the inner ring of the second bearing 4 respectively, the inner ring and the outer ring of the first bearing 3 are in axial stop fit with the anti-abrasion sleeve 2 and the upper flange 1, the inner ring and the outer ring of the second bearing 4 are in axial stop fit with the anti-abrasion sleeve 2 and the lower flange 5, when the drill string is pulled out upwards, the first bearing 3 bears an upward acting force, but because the upper flange 1 is in stop fit with the outer ring of the first bearing 3, the first bearing 3 cannot move relative to the anti-abrasion sleeve 2 or the upper flange 1 in the axial direction, and the related sealing part cannot be damaged; when the drill string is lowered, the second bearing 4 bears downward acting force, but because the lower flange 5 is in stop fit with the outer ring of the second bearing 4, the second bearing 4 cannot axially move relative to the anti-wear sleeve 2 or the lower flange 5, and the related sealing part cannot be damaged.
In the embodiment, the upper flange is screwed outside the lower flange, and a structure similar to a hat is formed outside the lower flange, so that the bearing chamber can be better protected, and liquid is not easy to enter the bearing chamber. In other embodiments, an internal thread may be provided on the inner wall of the lower flange, an external thread may be provided on the outer wall of the upper flange, and the upper flange may be threadedly mounted in the lower flange. The upper and lower flanges may also be bolted together.
In the above embodiment, the annular boss is arranged outside the anti-wear sleeve, the upper end face of the annular boss upwards supports the first bearing inner ring, and the lower end face of the annular boss downwards supports the second bearing inner ring. In other embodiments, a threaded sleeve can be screwed outside the wear-resistant sleeve, the thickness of the threaded sleeve is not more than the thickness of the inner rings of the first bearing and the second bearing, the first bearing inner ring is jacked upwards through the upper end surface of the threaded sleeve, and the second bearing inner ring is jacked downwards through the lower end surface of the threaded sleeve.
In the above embodiment, the wear sleeve has a protruding portion protruding radially beyond the annular projection, and the protruding portion is accommodated in the space between the first bearing chamber and the second bearing chamber, so as to maintain the position of the lubricating oil and prevent the first bearing from being damaged due to the downward flow of the lubricating oil. In other embodiments, the wear-resistant sleeve may not have a protruding portion, and only the annular boss is provided to axially stop the first and second bearing inner rings.
Claims (6)
1. The utility model provides a well head drilling tool eccentric wear prevention device which characterized by includes:
the inner wall of the upper flange is provided with a downward step surface;
the inner wall of the lower flange is provided with an upward step surface;
the outer wall of the anti-abrasion sleeve is provided with an upper top support surface and a lower top support surface, a first bearing chamber is defined between the upper top support surface and the step surface of the upper flange, and a second bearing chamber is defined between the lower top support surface and the step surface of the lower flange;
the first bearing is arranged in the first bearing chamber, the outer ring is in axial stop fit with the step surface of the upper flange, and the inner ring is in axial stop fit with the upper jacking surface of the anti-abrasion sleeve;
and the second bearing is arranged in the second bearing chamber, the outer ring is in axial stop fit with the step surface of the lower flange, and the inner ring is in axial stop fit with the lower jacking surface of the anti-abrasion sleeve.
2. An eccentric wear prevention device for a wellhead drilling tool as claimed in claim 1 wherein the upper flange is threadedly connected to the lower flange.
3. An eccentric wear prevention device for a wellhead drilling tool as claimed in claim 2 wherein a circumferential seal is provided between the upper and lower flanges to effect circumferential sealing between the upper and lower flanges.
4. An eccentric wear prevention device for a wellhead drilling tool as claimed in claim 2 wherein the outer wall of the lower flange is provided with external threads and the upper flange is screwed on the outside of the lower flange.
5. The wellhead drilling tool eccentric wear prevention device according to any one of claims 1 to 4, characterized in that the outer part of the wear prevention sleeve is provided with an annular boss, the upper end surface of the annular boss forms the upper top support surface, and the lower end surface of the annular boss forms the lower top support surface.
6. An anti-eccentric device for a wellhead drilling tool as claimed in claim 5 wherein the wear sleeve has a projection projecting radially beyond the annular boss, the projection being received in the space between the first and second bearing chambers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921619134.6U CN210622756U (en) | 2019-09-26 | 2019-09-26 | Eccentric wear prevention device for wellhead drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921619134.6U CN210622756U (en) | 2019-09-26 | 2019-09-26 | Eccentric wear prevention device for wellhead drilling tool |
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| Publication Number | Publication Date |
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| CN210622756U true CN210622756U (en) | 2020-05-26 |
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| CN201921619134.6U Active CN210622756U (en) | 2019-09-26 | 2019-09-26 | Eccentric wear prevention device for wellhead drilling tool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983839A (en) * | 2021-03-17 | 2021-06-18 | 台州阳春机电有限公司 | Submersible pump |
-
2019
- 2019-09-26 CN CN201921619134.6U patent/CN210622756U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983839A (en) * | 2021-03-17 | 2021-06-18 | 台州阳春机电有限公司 | Submersible pump |
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