CN201024926Y - Trolley spiral bushing centralizer - Google Patents
Trolley spiral bushing centralizer Download PDFInfo
- Publication number
- CN201024926Y CN201024926Y CNU200720148974XU CN200720148974U CN201024926Y CN 201024926 Y CN201024926 Y CN 201024926Y CN U200720148974X U CNU200720148974X U CN U200720148974XU CN 200720148974 U CN200720148974 U CN 200720148974U CN 201024926 Y CN201024926 Y CN 201024926Y
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- centralizer
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- sleeve
- rolling wheel
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Abstract
The utility model discloses a rolling wheel type helix sleeve centralizer and belongs to the petroleum or geology developing sleeve and well domain. The utility model comprises a centralizer body; the outer side of the centralizer body is provided with a centralizing lump and the centralizer is helix shape; a rolling wheel is provided between two neighboring centralizing bodies; the rolling wheel is positioned on the centralizer through the pin axis; and the side surface of the centralizer is provided with a positioning helix hole. The utility model is characterized in that the rolling wheel can change the sliding friction to rolling friction and reduce the resistance of the sleeve; the helix structure of the centralizing body can scrap the soil cake in the inserting process, but also can enhance the replacing efficiency of the cement and change the stressing status of the sleeve wall to bring convenience to the inserting of the sleeve. The post line of the rolling wheel is vertical with the axel of the centralizing body to bring convenience to the rolling and reduce the friction to the lowest. Therefore the utility model is particular applicable to the well which has a large horizontal and slope degree.
Description
Technical field
Cased hole completion field when the utility model relates to oil (or geology) production drilling is mainly used in the construction of big gradient or horizontal well completion, realizes a kind of downhole tool that is lowered to sleeve pipe smoothly and improves cementing quality.
Background technology
Casing stabbing board mainly is to be used for wellbore construction setting of casing process to make casing centralization, realize the downhole tool that sleeve pipe is lowered to smoothly, but different centralizer result of use difference is bigger.As the Chinese patent notification number is 2707941Y, the utility model patent that the open date is on July 6th, 2005 discloses a kind of casing stabbing board, this centralizer is an elastic centralizer, is spring leaf to be set constitute between upper and lower connector, utilizes spring leaf to make casing centralization.This centralizer is mainly used in the straight well, in horizontal well or high angle hole, this centralizer is because reasons in structure, be lowered in the process with production string, enter the big well section of level or gradient, transferring resistance increases, centralizer downcuts a large amount of mud cakes in this section simultaneously, be piled up in the centralizer bottom, cause sleeve pipe can't pass through, sleeve pipe is hampered together with centralizer, cause down-hole accident when serious, promptly allow to be lowered to reluctantly but mud cake causes displacement efficiency of cement slurry low after building up, increased construction cost, influence ordinary production.The Chinese patent notification number is 2693935Y, and the utility model patent that open day is on April 20th, 2005 discloses a kind of roller type centralizer, and its adopts the mode of roller to reduce frictional resistance, and makes roller inclination 15～85 degree.But, facts have proved when helical angle is spent less than 60, easily to cause locking phenomenon (helical angle less than equivalent friction angle time), sleeve pipe easily stuck causing can't be lowered to, hold-down screw perhaps occurs and cut off phenomenons such as centralizer dislocation, cause sleeve pipe to be lowered to equally and be obstructed; In addition, the roller axis of this roller type centralizer is vertical with the side line or approach vertically, has increased in the setting of casing process and the friction torque between the borehole wall, easily causes dog screw to cut off accident, causes rolling wheel centralizer and uses and lost efficacy or setting of casing is hampered.
Summary of the invention
The technical problems to be solved in the utility model is to overcome in the prior art centralizer to transfer the big deficiency of resistance, design and a kind ofly can greatly reduce the casing stabbing board that sleeve pipe is transferred resistance, and can in being lowered to process, strike off mud cake simultaneously attached to the borehole wall, improve displacement efficiency of cement slurry, and can change the casing wall stress, make things convenient for sleeve pipe to be lowered to smoothly.
The technical scheme that its technical problem that solves the utility model adopts is: roller type screw shell centralizer, comprise centralizer body, the described centralizer body outside is provided with wiper block, described wiper block is a helical form, be provided with roller between two adjacent wiper blocks, described roller is installed on the wiper block by bearing pin; Described centralizer body side is provided with positioning screw hole.
The angle of the tangent to helix of described wiper block and the axis of described centralizer body is 65～80 degree.
The angle of the tangent to helix of described wiper block and the axis of described centralizer body is 75 degree.
The axis of described roller and the axis normal of described centralizer body.
The beneficial effect that the utility model produced is, sliding friction became rolling friction when the setting of roller made setting of casing, resistance when having reduced setting of casing, and the sped structure of wiper block can not only strike off the mud cake attached to the borehole wall simultaneously in being lowered to process, improve displacement efficiency of cement slurry, and can change the casing wall stress, make things convenient for sleeve pipe to be lowered to smoothly.The post line that rolls and the axis normal of centralizer body are more conducive to roll in the management of trapping, and make frictional force reduce to minimum.The utility model is particularly useful for level and the bigger well section of gradient.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structural representation of a kind of embodiment of roller type screw shell centralizer of the present utility model;
Fig. 2 is an A-A view embodiment illustrated in fig. 1;
Fig. 3 is the lateral view of the roller of roller type screw shell centralizer of the present utility model.
Among the figure: 1. centralizer body, 2. bearing pin, 3. roller, 4. wiper block, 5. positioning screw hole.
The specific embodiment
As depicted in figs. 1 and 2, casing stabbing board of the present utility model has a tubulose centralizer body 1, the lateral surface of centralizer body 1 is provided with the wiper block 4 of spiral helicine projection, wiper block 4 has many, adjacent two is one group, is provided with roller 3 between two wiper blocks 4 of every group, and roller 3 is installed on the wiper block 4 by the bearing pin 2 that passes its axle center, roller 3 is horizontally disposed with, and promptly its axle center is perpendicular to the axle center of centralizer body 1.The helical angle of wiper block 4 (angle of tangent to helix and centralizer body axis) is advisable with 65～80 degree, is the best with 75 degree.Roller 3 can be spheroid, spheroid or cylinder etc.In wellbore construction setting of casing process, particularly when the big well section of the level of entering or gradient, because roller type screw shell centralizer of the present utility model and casing wall are by positioning screw hole 5 relative fixed, the sliding friction that roller 3 can become the casing wall and the borehole wall is rolling friction, significantly reduce sleeve pipe and be lowered to resistance, make the sleeve pipe borehole wall and unimpededly being lowered between two parties, spiral wiper block structure not only can be struck off the mud cake attached to the borehole wall, displacement efficiency of cement slurry when improving well cementation, and spiral angle has changed sleeve pipe and has been lowered in the process vertical stress, can a little rotation when running into wall drag, guaranteed that sleeve pipe is lowered to smoothly, improve sleeve pipe and be lowered to efficient, avoided the generation of down-hole engineering accident.
Claims (4)
1. roller type screw shell centralizer comprises centralizer body, and the described centralizer body outside is provided with wiper block, it is characterized in that described wiper block is a helical form, is provided with roller between two adjacent wiper blocks, and described roller is installed on the wiper block by bearing pin; Described centralizer body side is provided with positioning screw hole.
2. roller type screw shell centralizer according to claim 1 is characterized in that, the angle of the tangent to helix of described wiper block and the axis of described centralizer body is 65～80 degree.
3. roller type screw shell centralizer according to claim 2 is characterized in that, the angle of the tangent to helix of described wiper block and the axis of described centralizer body is 75 degree.
4. according to claim 1,2 or 3 described roller type screw shell centralizers, it is characterized in that the axis of described roller and the axis normal of described centralizer body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720148974XU CN201024926Y (en) | 2007-04-28 | 2007-04-28 | Trolley spiral bushing centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720148974XU CN201024926Y (en) | 2007-04-28 | 2007-04-28 | Trolley spiral bushing centralizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201024926Y true CN201024926Y (en) | 2008-02-20 |
Family
ID=39098783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720148974XU Expired - Fee Related CN201024926Y (en) | 2007-04-28 | 2007-04-28 | Trolley spiral bushing centralizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201024926Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032032A (en) * | 2012-12-31 | 2013-04-10 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Helical rigid roller resin centralizer for casings |
| CN107255018A (en) * | 2017-07-11 | 2017-10-17 | 深圳市远东石油钻采工程有限公司 | A kind of non-rotation centralizer of variable-diameter roller type |
| CN112253009A (en) * | 2020-12-09 | 2021-01-22 | 中国石油天然气集团有限公司 | Roller drag reducer for continuous oil pipe |
-
2007
- 2007-04-28 CN CNU200720148974XU patent/CN201024926Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032032A (en) * | 2012-12-31 | 2013-04-10 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Helical rigid roller resin centralizer for casings |
| CN107255018A (en) * | 2017-07-11 | 2017-10-17 | 深圳市远东石油钻采工程有限公司 | A kind of non-rotation centralizer of variable-diameter roller type |
| CN112253009A (en) * | 2020-12-09 | 2021-01-22 | 中国石油天然气集团有限公司 | Roller drag reducer for continuous oil pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080220 Termination date: 20150428 |
|
| EXPY | Termination of patent right or utility model |