CN113756729A - Bead string type sucker rod abrasion-proof centralizer - Google Patents
Bead string type sucker rod abrasion-proof centralizer Download PDFInfo
- Publication number
- CN113756729A CN113756729A CN202111280413.6A CN202111280413A CN113756729A CN 113756729 A CN113756729 A CN 113756729A CN 202111280413 A CN202111280413 A CN 202111280413A CN 113756729 A CN113756729 A CN 113756729A
- Authority
- CN
- China
- Prior art keywords
- annular
- abrasion
- sleeve
- centralizing
- rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011324 bead Substances 0.000 title abstract description 8
- 238000005299 abrasion Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000004677 Nylon Substances 0.000 claims abstract description 6
- 229920001778 nylon Polymers 0.000 claims abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 4
- 241001146209 Curio rowleyanus Species 0.000 claims 1
- 239000003129 oil well Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 5
- 230000001174 ascending effect Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1071—Wear protectors; Centralising devices, e.g. stabilisers specially adapted for pump rods, e.g. sucker rods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1085—Wear protectors; Blast joints; Hard facing
Abstract
The invention discloses a bead string type sucker rod anti-abrasion centralizer, which structurally comprises an upper joint, a lower joint and a centralizing center rod arranged between the upper joint and the lower joint, wherein a plurality of arc-shaped anti-abrasion centralizing blocks are formed on the outer side of the centralizing center rod, the anti-abrasion centralizing blocks are connected on the centralizing center rod in series, the anti-abrasion centralizing blocks are made of high-polymer nylon materials, a supporting frame body is arranged inside the anti-abrasion centralizing blocks, and the supporting frame body is rotatably arranged on the centralizing center rod and enables the anti-abrasion centralizing blocks to synchronously rotate.
Description
The technical field is as follows:
the invention relates to the technical field of production of centralizers, in particular to a bead string type sucker rod abrasion-proof centralizer.
Background art:
in the oil extraction operation, the oil extraction machine utilizes the up-and-down reciprocating motion of the sucker rod to extract the oil in the oil pumping pipe, in the up-and-down motion of the sucker rod, because the length of the oil pumping pipe is very long, the oil well can even reach several kilometers along with the depth of the oil well, bending exists unavoidably, especially in an inclined shaft section, the friction force between the sucker rod and the oil pumping pipe is large, great abrasion can be generated on the rubber which is anti-abrasion on the sucker rod, the service life of the sucker rod is seriously influenced.
The invention content is as follows:
it is an object of the present invention to provide a beaded sucker rod wear centralizer that solves one or more of the above-mentioned problems with the prior art.
In order to solve the technical problem, the invention provides a bead string type sucker rod abrasion-proof centralizer which structurally comprises an upper joint, a lower joint and a centralizing central rod arranged between the upper joint and the lower joint, and is characterized in that: righting well core rod's the outside and being formed with a plurality of curved abrasionproof and righting the piece, a plurality of abrasionproof are right the piece and are concatenated on righting well core rod, and the material of abrasionproof piece of righting is polymer nylon materials, and the inside of abrasionproof piece of righting is equipped with the support skeleton body, and the rotatable setting of support skeleton body just makes the abrasionproof piece of righting to carry out synchronous rotation on righting well core rod.
Furthermore, an annular sleeve is arranged at the joint between two adjacent anti-abrasion centering blocks, the annular sleeve is rotatably arranged on the centering center rod, two symmetrical annular sliding grooves are formed in two ends of the annular sleeve, and the support framework body can be elastically and slidably arranged inside the annular sliding grooves.
Further, above-mentioned support skeleton body is including rotating the sleeve pipe that sets up on righting well core rod and setting up the tripod on the sleeve pipe, and the summit position of tripod supports at the highest point of abrasionproof righting piece cambered surface, and sheathed tube tip is equipped with the annular slab, and the annular slab slides and sets up in the inside of annular sliding tray, and the opening part of annular sliding tray is equipped with the locating part of restriction annular slab roll-off, and the inside of annular sliding tray is equipped with buffer spring, and buffer spring's tip and annular slab are connected.
Furthermore, the limiting part comprises an annular limiting plate arranged at the opening position of the annular sliding groove and a plurality of limiting pipes arranged on the annular plate, a plurality of limiting rods are arranged on the annular limiting plate, and the limiting rods are arranged inside the limiting pipes in a telescopic mode.
Further, above-mentioned sleeve pipe and tripod integrated into one piece, the summit of tripod is equipped with the ball, and the outside cladding of ball has rubber, and the fretwork groove has been seted up to the highest point of the piece cambered surface is right to the abrasionproof, the rolling surface and the fretwork groove parallel and level of ball.
The invention has the beneficial effects that:
1. the invention provides a bead string type sucker rod anti-abrasion centralizer, which is characterized in that when a sucker rod is put into an oil well, the position of a centralizing center rod corresponds to an inclined well section of the oil well, at the moment, an anti-abrasion centralizing block is abutted against the well wall of the oil well, and because the anti-abrasion centralizing block is arc-shaped, the contact surface of the anti-abrasion centralizing block and the well wall of the oil well is point contact, the friction between the anti-abrasion centralizing block and the well wall of the oil well is reduced, the anti-abrasion centralizing block is effectively protected, and the upward or downward resistance of the sucker rod is reduced.
2. The invention provides a bead string type sucker rod anti-abrasion centralizer, wherein an anti-abrasion centralizing block belongs to a high polymer nylon material, and the anti-abrasion centralizing block can deform to a certain extent in the friction process of the anti-abrasion centralizing block and an oil well wall, at the moment, the anti-abrasion centralizing block is supported and protected by a supporting framework body, so that the phenomenon that the anti-abrasion centralizing block deforms for a long time to cause permanent deformation and cause non-contact between the anti-abrasion centralizing block and the oil well wall is avoided, and meanwhile, under the action of fluid of liquid in an oil pipe, the anti-abrasion centralizing block rotates freely along with the supporting framework body, so that the anti-abrasion centralizing block can be worn uniformly, and the service life of the anti-abrasion centralizing block is prolonged.
3. The invention provides a bead string type sucker rod abrasion-proof centralizer, wherein when an annular plate elastically moves in an annular sliding groove, a limiting rod is always limited in a limiting pipe, so that the elastic movement of the annular plate is limited, the limiting rod freely stretches in the limiting pipe, the elastic movement of the annular plate can be kept stable, and the phenomenon of dislocation between adjacent abrasion-proof centralizing blocks is avoided.
Description of the drawings:
fig. 1 is a schematic side view of the present invention.
Fig. 2 is an internal structural view of the annular sliding groove of the present invention.
Fig. 3 is a sectional end view of the annular slide groove of the present invention.
The specific implementation mode is as follows:
for the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Fig. 1 to 3 show a specific embodiment of the present invention, which structurally includes an upper joint 1, a lower joint 2, and a centering center rod 3 disposed between the upper joint 1 and the lower joint 2, wherein a plurality of arc-shaped anti-abrasion centering blocks 4 are formed on the outer side of the centering center rod 3, the plurality of anti-abrasion centering blocks 4 are connected in series to the centering center rod 3, the anti-abrasion centering blocks 4 are made of a polymer nylon material, a supporting frame body 5 is disposed inside the anti-abrasion centering blocks 4, and the supporting frame body 5 is rotatably disposed on the centering center rod 3 and enables the anti-abrasion centering blocks 4 to rotate synchronously.
In the invention, the working principle of the anti-abrasion centralizer is as follows: to right well rod 3 and pass through top connection 1, lower clutch 2 connects respectively between two sucker rods, when the oil well is gone into under the sucker rod, the position that will right well rod 3 corresponds the inclined shaft section at the oil well, at this moment, the piece is right to the abrasionproof 4 conflicts on the wall of a well of oil well, because the abrasionproof is right to piece 4 and the contact surface of the wall of a well of oil well is the point contact, thereby the friction between the piece is right to the abrasionproof 4 and the wall of a well of an well has been reduced, not only effectual protection abrasionproof is right to piece 4, and the ascending or descending resistance of sucker rod has been reduced.
In the invention, as the anti-abrasion centering block 4 belongs to a high polymer nylon material, the anti-abrasion centering block 4 can deform to a certain extent in the friction process of the anti-abrasion centering block 4 and the well wall of the oil well, at the moment, the support framework body 5 plays a role in supporting and protecting the anti-abrasion centering block 4, so that the phenomenon that the anti-abrasion centering block 4 deforms for a long time to cause permanent deformation and cause non-contact between the anti-abrasion centering block 4 and the well wall of the oil well is avoided, and meanwhile, under the action of fluid of liquid in the oil pipe, the anti-abrasion centering block 4 rotates freely along with the support framework body 5, so that the anti-abrasion centering block 4 can be worn uniformly, and the service life of the anti-abrasion centering block 4 is prolonged.
In the invention, as a preferable scheme, an annular sleeve 41 is arranged at the joint between two adjacent anti-abrasion centering blocks 4, the annular sleeve 41 is rotatably arranged on the centering center rod 3, two ends of the annular sleeve 41 are provided with symmetrical annular sliding grooves 411, and the support framework body 5 is elastically and slidably arranged inside the annular sliding grooves 411.
In the invention, in the ascending or descending process of the sucker rod, the support framework body 5 is driven to perform elastic movement in the annular sliding groove 411, and the elastic movement reduces the friction effect of ascending or descending pressure of the sucker rod on the anti-abrasion centering block 4, thereby further reducing the abrasion of the anti-abrasion centering block 4.
In the present invention, the specific structure of the support frame body 5 is preferably as follows: the supporting frame body 5 comprises a sleeve 51 rotatably arranged on the centering center rod 3 and a tripod 52 arranged on the sleeve 51, the vertex position of the tripod 52 is supported at the highest position of the cambered surface of the anti-abrasion centering block 4, an annular plate 511 is arranged at the end part of the sleeve 51, the annular plate 511 is arranged in an annular sliding groove 411 in a sliding manner, a limiting part 6 for limiting the annular plate 511 to slide out is arranged at the opening of the annular sliding groove 411, a buffer spring 412 is arranged in the annular sliding groove 411, and the end part of the buffer spring 412 is connected with the annular plate 511.
In the present invention, the tripod 52 improves the stability of the whole structure of the support frame 5, so as to ensure the support function of the support frame 5 on the anti-wear centering block 4, and the annular plate 511 performs elastic movement in the annular sliding slot 411 through the buffer spring 412, so as to drive the elastic movement of the support frame 5.
In the invention, in the process of elastic movement of the supporting framework body 5, the limiting piece 6 can prevent the annular plate 511 from moving to the outer side of the annular sliding groove 411, so that the phenomenon of disjointing between adjacent anti-abrasion centering blocks 4 is avoided, and the adjacent anti-abrasion centering blocks 4 can be tightly connected on the annular sleeve 41.
In the present invention, it is preferable that the stopper 6 has a specific structure as follows: the limiting member 6 includes an annular limiting plate 61 disposed at an opening of the annular sliding groove 411 and a plurality of limiting tubes 62 disposed on the annular plate 511, a plurality of limiting rods 611 are disposed on an end of the sleeve 51, and the limiting rods 611 are telescopically disposed inside the limiting tubes 62.
In the invention, when the annular plate 511 performs elastic movement in the annular sliding groove 411, the limiting rod 611 is always limited in the limiting pipe 62, so that the elastic movement of the annular plate 511 is limited, and the limiting rod 611 freely stretches in the limiting pipe 62, so that the elastic movement of the annular plate 511 can be kept stable, and the phenomenon of dislocation between adjacent anti-wear righting blocks 4 is avoided.
In the present invention, as a preferable scheme, the sleeve 51 and the tripod 52 are integrally formed, the vertex of the tripod 52 is provided with a ball 521, the outer side of the ball 521 is coated with rubber, the highest position of the arc surface of the anti-abrasion centering block 4 is provided with a hollow groove 101, and the rolling surface of the ball 521 is flush with the hollow groove 101.
In the invention, the balls 521 roll on the well wall synchronously in the friction process of the anti-abrasion centering block 4 on the well wall, and the rolling further reduces the upward or downward resistance of the sucker rod.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a string of beads formula sucker rod abrasionproof centralizer, its structure includes top connection (1), lower clutch (2) and sets up top connection (1) with centering center rod (3) between lower clutch (2), its characterized in that: righting the outside of well core rod (3) and being formed with a plurality of curved abrasionproof and righting piece (4), it is a plurality of abrasionproof righting piece (4) concatenate on righting well core rod (3), the material of abrasionproof righting piece (4) is polymer nylon material, the inside of abrasionproof righting piece (4) is equipped with support skeleton body (5), the rotatable setting of support skeleton body (5) is in right well core rod (3) and make abrasionproof righting piece (4) carry out synchronous rotation.
2. The beaded sucker rod wear prevention centralizer of claim 1, wherein: an annular sleeve (41) is arranged at the joint between every two adjacent anti-abrasion centralizing blocks (4), the annular sleeve (41) is rotatably arranged on the centralizing central rod (3), symmetrical annular sliding grooves (411) are formed in the two ends of the annular sleeve (41), and the support framework body (5) can be elastically and slidably arranged inside the annular sliding grooves (411).
3. The beaded sucker rod wear prevention centralizer of claim 1, wherein: the supporting framework body (5) comprises a sleeve (51) rotatably arranged on the centering center rod (3) and a tripod (52) arranged on the sleeve (51), the vertex position of the tripod (52) is supported at the highest position of the arc surface of the anti-abrasion centering block (4), an annular plate (511) is arranged at the end part of the sleeve (51), the annular plate (511) is slidably arranged inside the annular sliding groove (411), a limiting part (6) for limiting the annular plate (511) to slide out is arranged at the opening of the annular sliding groove (411), a buffer spring (412) is arranged inside the annular sliding groove (411), and the end part of the buffer spring (412) is connected with the annular plate (511).
4. The beaded sucker rod wear prevention centralizer of claim 3, wherein: the locating part (6) is in including setting up annular limiting plate (61) and a plurality of setting of annular sliding groove (411) open position are in spacing pipe (62) on annular plate (511), be equipped with a plurality of gag lever posts (611) on annular limiting plate (61), gag lever post (611) flexible setting is in the inside of spacing pipe (62).
5. The beaded sucker rod wear prevention centralizer of claim 3, wherein: the wear-resistant centering block is characterized in that the sleeve (51) and the tripod (52) are integrally formed, a ball (521) is arranged at the top of the tripod (52), rubber is coated on the outer side of the ball (521), a hollowed groove (101) is formed in the highest position of the cambered surface of the wear-resistant centering block (4), and the rolling surface of the ball (521) is flush with the hollowed groove (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111280413.6A CN113756729A (en) | 2021-11-01 | 2021-11-01 | Bead string type sucker rod abrasion-proof centralizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111280413.6A CN113756729A (en) | 2021-11-01 | 2021-11-01 | Bead string type sucker rod abrasion-proof centralizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113756729A true CN113756729A (en) | 2021-12-07 |
Family
ID=78784597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111280413.6A Pending CN113756729A (en) | 2021-11-01 | 2021-11-01 | Bead string type sucker rod abrasion-proof centralizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113756729A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5785125A (en) * | 1996-10-21 | 1998-07-28 | Tiw Corporation | Mechanical thru-tubing centralizer |
| CN2779037Y (en) * | 2005-03-05 | 2006-05-10 | 张伟 | Whole pole fixed type centralizer |
| CN200961449Y (en) * | 2006-10-20 | 2007-10-17 | 赵科昌 | Oil sucking rod for resisting eccentric wear |
| CN201714318U (en) * | 2010-05-05 | 2011-01-19 | 齐金龙 | Eccentric wear prevention rotary type centralizer for pumping rod and oil pipe of screw pump in oilfield |
| CN102312657A (en) * | 2011-09-16 | 2012-01-11 | 淮安市井神钻采机具有限公司 | High-temperature-resistant and wear-resistant hollow rod centering guide |
| US20120205093A1 (en) * | 2011-02-14 | 2012-08-16 | Nathan Paszek | Instrument for Centering Tools Within a Wellbore |
| CN108756775A (en) * | 2018-06-13 | 2018-11-06 | 大庆市晟威机械制造有限公司 | A kind of elastic oil pumping rod centering device in oil field |
| CN110029948A (en) * | 2019-06-03 | 2019-07-19 | 中铁隧道集团一处有限公司 | Drill bit erection device for long range horizontal drilling of constructing |
| CN210743645U (en) * | 2019-10-22 | 2020-06-12 | 东莞市指南针高分子材料有限公司 | Durable halogen-free TPF wire |
| CN111594065A (en) * | 2020-06-10 | 2020-08-28 | 张雪蓉 | Composite sucker rod centering device for oil field |
| CN111878005A (en) * | 2020-08-10 | 2020-11-03 | 单芳 | Quick-release quick-change sucker rod centralizer and method |
| CN213928273U (en) * | 2020-12-31 | 2021-08-10 | 大庆市宏博晟达石油机械设备有限公司 | High strength aluminum alloy centralizer |
-
2021
- 2021-11-01 CN CN202111280413.6A patent/CN113756729A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5785125A (en) * | 1996-10-21 | 1998-07-28 | Tiw Corporation | Mechanical thru-tubing centralizer |
| CN2779037Y (en) * | 2005-03-05 | 2006-05-10 | 张伟 | Whole pole fixed type centralizer |
| CN200961449Y (en) * | 2006-10-20 | 2007-10-17 | 赵科昌 | Oil sucking rod for resisting eccentric wear |
| CN201714318U (en) * | 2010-05-05 | 2011-01-19 | 齐金龙 | Eccentric wear prevention rotary type centralizer for pumping rod and oil pipe of screw pump in oilfield |
| US20120205093A1 (en) * | 2011-02-14 | 2012-08-16 | Nathan Paszek | Instrument for Centering Tools Within a Wellbore |
| CN102312657A (en) * | 2011-09-16 | 2012-01-11 | 淮安市井神钻采机具有限公司 | High-temperature-resistant and wear-resistant hollow rod centering guide |
| CN108756775A (en) * | 2018-06-13 | 2018-11-06 | 大庆市晟威机械制造有限公司 | A kind of elastic oil pumping rod centering device in oil field |
| CN110029948A (en) * | 2019-06-03 | 2019-07-19 | 中铁隧道集团一处有限公司 | Drill bit erection device for long range horizontal drilling of constructing |
| CN210743645U (en) * | 2019-10-22 | 2020-06-12 | 东莞市指南针高分子材料有限公司 | Durable halogen-free TPF wire |
| CN111594065A (en) * | 2020-06-10 | 2020-08-28 | 张雪蓉 | Composite sucker rod centering device for oil field |
| CN111878005A (en) * | 2020-08-10 | 2020-11-03 | 单芳 | Quick-release quick-change sucker rod centralizer and method |
| CN213928273U (en) * | 2020-12-31 | 2021-08-10 | 大庆市宏博晟达石油机械设备有限公司 | High strength aluminum alloy centralizer |
Non-Patent Citations (1)
| Title |
|---|
| 侯洪涛;尚朝辉;邹群: "高含水期小泵深抽井防偏磨技术", 石油地质与工程, vol. 23, no. 01, pages 125 - 127 * |
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