CN208718577U - A kind of semi-rigid spiral centering device with internal trolley - Google Patents
A kind of semi-rigid spiral centering device with internal trolley Download PDFInfo
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- CN208718577U CN208718577U CN201821011296.7U CN201821011296U CN208718577U CN 208718577 U CN208718577 U CN 208718577U CN 201821011296 U CN201821011296 U CN 201821011296U CN 208718577 U CN208718577 U CN 208718577U
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- centralizer
- centralizer body
- idler wheel
- wall
- semi
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Abstract
The utility model discloses a kind of semi-rigid spiral centering device with internal trolley, centralizer body including circular tube shaped, the outer surface of centralizer body is provided with the wiper block of fusiform, the inner wall of centralizer body opens up fluted, idler wheel is provided in groove, idler wheel passes through the tube wall axial restraint of roller bearing and centralizer body, and one end of roller bearing is fixed by position-limitting pin and centralizer body；The centralizer can be while guaranteeing righting effect, when realizing the tripping in of oil gas casing, centralizer is changed into rolling friction around casing flexible rotating, by the friction mode between the borehole wall and centralizer, centralizer and casing, reduces the frictional resistance when tripping in of oil gas casing.
Description
Technical field
The utility model belongs to oil drilling auxiliary field of mechanical technique, is related to a kind of semi-rigid spiral with internal trolley
Centralizer.
Background technique
Casing job is the key link of completion practice, and centralizer is guarantee casing centering effect in the wellbore unique
Mechanical part.When field application, every 1~3 casing requires one casing stabbing board of installation.Centralizer in tripping in process, by
In the gravity of oil/gas well tubing string itself, caused by directional well, the lower curved section of horizontal well, horizontal segment, tubing string gravity
Frictional force between centralizer and the borehole wall is larger, will cause casing sticking when serious, cause casing can not be successfully transfer to it is predetermined
Position.
Industry widespread practice is at present, by optimizing the righting block shape or structure of centralizer, or on wiper block
Outer idler wheel is installed, to have the function that reduce frictional resistance between centralizer and the borehole wall.But since there are ooze on the borehole wall
Cake, outer pulley are very easy to be wrapped up by silt, do not have the effect for reducing frictional resistance not only, but also be easy to cause silting, make
The casing tripping in problem that is hampered is more prominent.In addition, since centralizer is directly sleeved on casing, traditional centralizer another
Problem is that centralizer inner wall is directly contacted with sleeve outer wall, and the way of contact is face contact, and centralizer can not flexibly be revolved around casing
Turn, causing the friction mode between casing and centralizer is sliding friction, when passing through hole anomaly or sand setting well section, resistance
It is larger, therefore the friction mode between casing and centralizer, centralizer and the borehole wall is changed into rolling friction, it can drop significantly
The tripping in frictional resistance of low casing.
Utility model content
The purpose of this utility model is to provide a kind of semi-rigid spiral centering device with internal trolley, solves existing skill
Centralizer present in art can not caused by casing flexible rotating under the larger problem of fashionable frictional resistance.
The utility model is the technical scheme adopted is that a kind of semi-rigid spiral centering device with internal trolley, including circle
The centralizer body of tubulose, the outer surface of centralizer body are provided with the wiper block of fusiform, and the inner wall of centralizer body offers
Groove is provided with idler wheel in groove, and idler wheel passes through the tube wall axial restraint of roller bearing and centralizer body, and one end of roller bearing passes through limit
Position pin is fixed with centralizer body.
The utility model is also characterized by
There are four wiper block settings, and the circumferencial direction along centralizer body is uniformly distributed.
The side wall of wiper block and centralizer body is in 20 °~30 ° of angle.
The depth of groove is not more than the thickness of centralizer body tube wall.
Idler wheel is provided with two groups, is respectively distributed to the top and bottom of centralizer body, and every group of idler wheel includes four, and edge is helped
The circumferencial direction of positive device ontology is uniformly distributed.
The wall thickness of wiper block is 2mm~3mm.
The diameter of idler wheel is not less than the groove width of groove, and the side of idler wheel contacts with oil/gas well sleeve outer wall, another laterally helps
Positive device inner body wall is projecting inward.
The utility model has the beneficial effects that a kind of semi-rigid spiral centering device with internal trolley of the utility model, is helped
The idler wheel of positive device body interior and the friction mode of oil/gas well sleeve outer wall are rolling friction, the wiper block outside centralizer body
Be at an angle of along the circumferencial direction of centralizer body it is evenly distributed, casing it is up and down and well cementation circulation when, centralizer can be flexible
Rotation substantially reduces down fashionable frictional resistance, and plays flow-disturbing or so to well cementing operation, improves cementing quality.
Detailed description of the invention
Fig. 1 is a kind of sectional structure chart of the semi-rigid spiral centering device with internal trolley of the utility model；
Fig. 2 is a kind of top view of the semi-rigid spiral centering device with internal trolley of the utility model.
In figure, 1. centralizer bodies, 2. wiper blocks, 3. roller bearings, 4. idler wheels, 5. stop screws.
Specific embodiment
The utility model can be described in detail with reference to the accompanying drawings and detailed description.
A kind of semi-rigid spiral centering device with internal trolley of the utility model, structure is as depicted in figs. 1 and 2, including circle
The centralizer body 1 of tubulose, the outer surface of centralizer body 1 are provided with the wiper block 2 of fusiform, and the inner wall of centralizer body 1 is opened
Equipped with groove, idler wheel 4 is provided in groove, idler wheel 4 passes through the tube wall axial restraint of roller bearing 3 and centralizer body 1, roller bearing 3
One end is fixed by position-limitting pin 5 and centralizer body 1.
There are four the settings of wiper block 2, and the circumferencial direction along centralizer body is uniformly distributed.
The side wall of wiper block 2 and centralizer body 1 is in 20 °~30 ° of angle, the rotation that angle is provided with conducive to centralizer
Turn.
The depth of groove is not more than the thickness of 1 tube wall of centralizer body.
Idler wheel 4 is provided with two groups, is respectively distributed to the top and bottom of centralizer body 1, and every group of idler wheel 4 includes four,
Circumferencial direction along centralizer body is uniformly distributed.
The wall thickness of wiper block 2 is 2mm~3mm.
The diameter of idler wheel 4 is not less than the groove width of groove, and the side of idler wheel 4 contacts with the sleeve outer wall of oil/gas well, the other side
It is projecting inward to 1 inner wall of centralizer body.
A kind of semi-rigid spiral centering device with internal trolley of the utility model, idler wheel 4 can be rolled around 3 flexible rotating of roller bearing
Axis 3 is fixed by stop screw 5, and idler wheel 4 is inwardly projecting, and after in-site installation, centralizer body 1 is directly sleeved on the casing of oil/gas well
On, idler wheel 4 is contacted with sleeve outer wall.
Wiper block 2 may make that oil gas casing is located at center in the wellbore after installing, when oil gas casing tripping in, spiral shell
Effect of the wiper block 2 of shape arrangement by casing advance opposite direction frictional force is revolved, axial-rotation component is integrally provided centralizer,
Since the friction mode of centralizer interior roller 4 and casing is rolling friction, so centralizer can be around the axial flexible of casing
Rotation reduces frictional resistance fashionable under bunch tube.
Wiper block 2 is by the steel plate punched molding with a thickness of 2mm, therefore wiper block 2 has certain deformability, in wellbore
Irregular or shrinkage section, can be improved the tripping in probability of oil gas casing.
By the above-mentioned means, a kind of semi-rigid spiral centering device with internal trolley of the utility model, in centralizer body
The idler wheel in portion and the friction mode of oil/gas well sleeve outer wall are rolling friction, and the wiper block outside centralizer body is helically arranged
Column, casing it is up and down and well cementation circulation when, centralizer can flexible rotating, substantially reduce down fashionable frictional resistance, and right
Flow-disturbing or so is played in well cementing operation, improves cementing quality.
Claims (3)
1. a kind of semi-rigid spiral centering device with internal trolley, which is characterized in that the centralizer body (1) including circular tube shaped,
The outer surface of the centralizer body (1) is provided with the wiper block (2) of fusiform, and the inner wall of the centralizer body (1) offers
Groove is provided with idler wheel (4) in groove, and the idler wheel (4) passes through the tube wall axial restraint of roller bearing (3) and centralizer body (1),
One end of the roller bearing (3) is fixed by position-limitting pin (5) and centralizer body (1), and there are four wiper block (2) settings,
Circumferencial direction along the centralizer body (1) is twist uniformly distributed, the wiper block (2) and the centralizer body
(1) side wall is in 20 °~30 ° of angle, and the depth of the groove is not more than the thickness of the centralizer body (1) tube wall, institute
It states idler wheel (4) and is provided with two groups, be respectively distributed to the top and bottom of the centralizer body (1), idler wheel described in every group (4) packet
Four are included, the circumferencial direction along the centralizer body (1) is uniformly distributed.
2. a kind of semi-rigid spiral centering device with internal trolley according to claim 1, which is characterized in that the righting
The wall thickness of block (2) is 2mm~3mm.
3. a kind of semi-rigid spiral centering device with internal trolley according to claim 1, which is characterized in that the idler wheel
(4) diameter is not less than the groove width of the groove, and the side of the idler wheel (4) contacts with oil/gas well sleeve outer wall, is another lateral
Centralizer body inner wall is projecting inward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821011296.7U CN208718577U (en) | 2018-06-28 | 2018-06-28 | A kind of semi-rigid spiral centering device with internal trolley |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821011296.7U CN208718577U (en) | 2018-06-28 | 2018-06-28 | A kind of semi-rigid spiral centering device with internal trolley |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208718577U true CN208718577U (en) | 2019-04-09 |
Family
ID=65972249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821011296.7U Expired - Fee Related CN208718577U (en) | 2018-06-28 | 2018-06-28 | A kind of semi-rigid spiral centering device with internal trolley |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208718577U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021991A (en) * | 2019-12-30 | 2020-04-17 | 长江大学 | Online cleaning device for oil pumping pipe of vertical well |
-
2018
- 2018-06-28 CN CN201821011296.7U patent/CN208718577U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021991A (en) * | 2019-12-30 | 2020-04-17 | 长江大学 | Online cleaning device for oil pumping pipe of vertical well |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190409 Termination date: 20210628 |