CN111535756A - Self-centering rotary guide device - Google Patents
Self-centering rotary guide device Download PDFInfo
- Publication number
- CN111535756A CN111535756A CN202010348489.7A CN202010348489A CN111535756A CN 111535756 A CN111535756 A CN 111535756A CN 202010348489 A CN202010348489 A CN 202010348489A CN 111535756 A CN111535756 A CN 111535756A
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- Prior art keywords
- rotary guide
- eccentric
- centering
- self
- ring body
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- 210000002445 nipple Anatomy 0.000 claims abstract description 22
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 4
- 210000001015 abdomen Anatomy 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 230000001788 irregular Effects 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B17/14—Casing shoes for the protection of the bottom of the casing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the field of well cementation and completion construction, and discloses a self-centering rotary guide device which mainly comprises an eccentric rotary guide mechanism and an elastic centering mechanism, wherein the eccentric rotary guide mechanism mainly comprises a rotary guide shoe body, an eccentric guide head, a rotary ball and the like, and the elastic centering mechanism mainly comprises a casing pipe nipple, an integral elastic centering device, a clamping ring and the like. The invention utilizes the eccentric rotary guide mechanism at the lower part of the device and the assistance of the weldless integral elastic righting mechanism specially designed at the middle part of the device, so that the automatic centering of the casing string at a belly well section, a large inclination or a horizontal well section can be realized, the automatic rotation angle is realized by the contact extrusion of the eccentric rotary guide shoe and the well wall, the well direction is searched, the casing string is safely put into a preset position, and good precondition is created for subsequent operation construction.
Description
Technical Field
The invention relates to the field of well cementation and completion construction, in particular to a self-centering rotary guide device.
Background
The conventional operation procedures of well cementation operation in oil drilling engineering are as follows: the lower part of the casing is connected with a float collar and a float shoe which are provided with one-way back pressure valves, the casing is put into a downhole design position, cement slurry is injected into the casing, a well cementation rubber plug is pressed in, then the drilling fluid is used for replacing the cement slurry into an annular space between the casing and a well wall, then the well cementation rubber plug is pressed against the float collar, and finally the cement is waited for setting. In fact, due to various complex reasons, a plurality of irregular well sections of a well bore often appear, so that the casing string is very difficult to drop in the process, particularly horizontal wells and highly deviated wells, the stability of the well wall of the horizontal wells and the highly deviated wells is generally poor, collapse or a large-belly well section is easy to appear, so that the casing string is easy to block in the dropping process, meanwhile, due to large horizontal displacement and long well bores, rock debris sedimentary beds are easy to form at the lower parts of the well bore, under the action of gravity, the casing is caused to be attached to the lower well wall in the casing dropping process, the resistance in the casing dropping process is increased, and the casing string is easy to fall to a preset well depth.
Disclosure of Invention
The invention aims to solve the technical problems and provides a self-centering rotary guide device which has a unique self-centering structure and a design for automatically finding the direction of a borehole and can effectively solve the problem of difficult running in irregular well sections, highly deviated wells and horizontal well casing strings.
In order to solve the technical problems, the invention adopts the following technical scheme:
a self-centering rotary guide device comprises an eccentric rotary guide mechanism and an elastic righting mechanism;
the eccentric rotation guide mechanism comprises a rotation guide shoe body and an eccentric guide head, wherein the rotation guide shoe body is of a tubular structure; the eccentric seeker is of a hollow structure, one end of the eccentric seeker is of an asymmetric eccentric arc hat-shaped structure, a plurality of circulation holes are formed in the center and the periphery of the end, the other end of the eccentric seeker is provided with a step which is hollow inside, and the step is rotatably arranged at the lower end of the rotary guide shoe body;
the elastic righting mechanism comprises a casing pipe short section and an integral elastic righting device, wherein the lower end of the casing pipe short section is fixedly connected with the upper end of the rotary guide shoe body, the casing pipe short section and the rotary guide shoe body are coaxially arranged, and the inner cavities of the casing pipe short section and the rotary guide shoe body are communicated; integral elasticity centralizer includes the integrative last ring body of making, lower ring body and a plurality of piece of rightting, every piece of rightting is the arc platelike structure that has elasticity, and a plurality of circumference equipartitions of righting the outside salient in middle part of the piece are right between last ring body and lower ring body, go up the ring body and down the ring body suit on the outer wall of sleeve pipe nipple joint correspondingly from top to bottom, go up the ring body and be in free state and can freely move at sleeve pipe nipple joint within range, the ring body is close to rotatory guide shoe body setting and the ring body is injectd on the sleeve pipe nipple joint down.
Preferably, an annular first ball groove is formed on an outer wall of a step of the eccentric guide head, an annular second ball groove is formed on an inner wall of the lower end of the rotary guide shoe body, the first ball groove and the second ball groove are correspondingly arranged inside and outside each other, and a plurality of rotary balls are further arranged between the first ball groove and the second ball groove to realize the rotary connection between the rotary guide shoe body and the eccentric guide head.
Preferably, the rotating guide shoe body and the step of the eccentric guide head are rotatably mounted together through a ball bearing.
Preferably, the integral elastic centralizer is made of an alloy steel pipe through integral laser cutting and punch forming.
Preferably, the maximum outer diameter of the integral elastic centralizer in a normal state is slightly larger than the maximum outer diameter of the drill bit.
Preferably, a snap ring is embedded at the lower part of the outer wall of the casing nipple, and the outer diameter of the snap ring is larger than the inner diameter of the lower ring body and used for limiting the lower ring body between the snap ring and the rotary guide shoe body.
Preferably, the lower part of the outer wall of the snap ring is provided with a conical surface and is matched with the inner side surface of the joint of the lower ring body and the righting piece.
Preferably, the casing sub is threadedly connected to the rotary guide shoe body.
The invention has the beneficial effects that: the invention designs a brand-new self-centering type rotary guide device, which utilizes an eccentric type rotary guide mechanism at the lower part of the device and is assisted by a weldless type integral elastic righting mechanism specially designed at the middle part of the device, so that the casing string can be automatically centered at a belly well section, a large inclination or a horizontal well section, and the automatic rotation angle and the well hole direction can be found through the contact extrusion of an eccentric type rotary guide shoe and a well wall, thereby realizing the safe running of the casing string to a preset position and creating good precondition for the subsequent operation construction.
Drawings
Fig. 1 is a schematic structural view of the self-centering rotary guide device of the present invention.
The guide shoe comprises a sleeve pipe nipple 1, an integral elastic centralizer 2, an upper ring body 21, a lower ring body 22, a righting sheet 23, a snap ring 3, a rotary guide shoe body 4, a rotary ball 5, an eccentric guide head 6 and a flow hole 61.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the self-centering rotary guide device of the present invention mainly comprises an eccentric rotary guide mechanism and an elastic centering mechanism. The eccentric rotation guide mechanism mainly comprises a rotation guide shoe body 4, an eccentric guide head 6 and the like, and the elastic centering mechanism mainly comprises a casing pipe nipple 1, an integral elastic centering device 2 and the like.
In the eccentric rotary guide mechanism, the eccentric guide head 6 is a hollow structure, the lower end of the eccentric guide head is designed into an asymmetric eccentric arc hat-shaped structure (the eccentric arc hat-shaped structure means that the lower end of the eccentric guide head 6 is eccentrically arranged towards the lower side, namely the bottommost part of the lower end of the eccentric guide head 6 is arranged eccentrically), the center and the periphery of the end are provided with a plurality of circulation holes 61, the upper end of the end is a vertically arranged step, and the inside of the step is hollow and communicated with the inner cavity of the eccentric guide head 6. The rotary guide shoe body 4 is of a tubular structure, is coaxially arranged with the casing pipe nipple 1 in the elastic righting mechanism, and inner cavities of the rotary guide shoe body and the casing pipe nipple 1 are communicated, specifically, the upper end of the rotary guide shoe body 4 is sleeved at the lower end of the casing pipe nipple 1 and is in threaded connection. The step of the lower extreme of rotatory guide shoe body 4 and the 6 upper ends of eccentric seeker is rotationally connected, and the rotation connected mode between them has the multiple, and one is: an annular first ball groove is formed on the outer wall of the step of the eccentric guide head 6, an annular second ball groove is formed on the inner wall of the lower end of the rotary guide shoe body 4, the step of the eccentric guide head 6 is arranged at the lower end of the rotary guide shoe body 4, a plurality of rotary balls 5 are arranged between the first ball groove and the second ball groove after the first ball groove and the second ball groove are arranged correspondingly inside and outside each other to realize the rotary connection between the rotary guide shoe body 4 and the eccentric guide head 6, and an eccentric rotary guide mechanism is assembled, wherein the assembly of the rotary balls 5 can refer to the way of the balls in the bearing, or holes can be formed at the corresponding positions of the rotary guide shoe body 4, the rotary balls 5 are placed into the annular circular groove formed by the first ball groove and the second ball groove one by one through the holes, and finally the holes are blocked; the second is that: the steps of the rotating guide shoe body 4 and the eccentric guide head 6 are rotatably installed together through a ball bearing; of course, the rotary guide shoe body 4 and the eccentric guide head 6 can also be installed in a more rotary mode, and the installation is not listed.
In the elastic centering mechanism, the integral elastic centering device 2 which plays a main role is made of alloy steel pipes by integral cutting and punch forming of laser, no welding point exists, the strength is high, the centering outer diameter of the integral elastic centering device 2 adopts an arc design, and the whole integral elastic centering device 2 is sleeved on the casing pipe nipple 1; specifically, integral elasticity centralizer 2 after integrative making includes ring body 21, lower ring body 22 and a plurality of piece 23 of righting, piece 23 of righting has great width, piece 23 of righting is elastic arc platelike structure all, and a plurality of piece 23 middle parts of righting outwards outstanding circumference equipartition between ring body 21 and lower ring body 22, go up ring body 21 and lower ring body 22 and correspond the suit on the outer wall of sleeve nipple 1 from top to bottom, it is in free state and can freely move at sleeve nipple 1 within range to go up ring body 21, when through the small-bore section, deformation through piece 23 of righting is favorable to it to pass through smoothly, lower ring body 22 the at utmost is close to rotatory guide shoe body 4 setting and lower ring body 22 is injectd on sleeve nipple 1. The mode that lower ring body 22 was injectd on casing nipple 1 has the multiple, can adopt welding or bolt locking, preferably, adopt snap ring 3 with lower ring body 22 fixed positioning on casing nipple 1, wherein the external diameter of snap ring 3 is greater than the internal diameter of lower ring body 22, the outer wall lower part of casing nipple 1 has still processed an annular groove, the annular groove is used for embedding installation snap ring 3, integral elasticity centralizer 2 suit is earlier on casing nipple 1 and makes lower ring body 22 top on the up end of rotatory guide shoe body 4 during the installation, again with snap ring 3 card in the annular groove, with this down ring body 22 restriction between snap ring 3 and rotatory guide shoe body 4. In addition, the lower part of the outer wall of the clamping ring 3 is also provided with a conical surface, the conical surface is matched with the inner side surface of the joint of the lower ring body 22 and the righting sheet 23, so that the conical surface and the inner side surface can not be scratched when in close contact, and the integral strength of the structure is prevented from being influenced.
When the self-centering rotary guide device is installed, the eccentric rotary guide mechanism and the elastic centering mechanism are connected into a whole through threads to form the self-centering rotary guide device.
When the pipe string is under the diameter section, the elastic righting mechanism can keep the sleeve string centered and smoothly goes into the pipe string. When the pipe string gets into big belly irregular well section, highly deviated well section or horizontal well section, through the contact extrusion of eccentric seeker and the wall of a well of eccentric rotatory guide mechanism, angle of rotation can be automatic, looks for unobstructed well direction, and the elasticity of this moment is right the mechanism and is played fine additional action, makes pipe string lower extreme placed in the middle for the pipe string is easier to be gone down to the design position safely.
The device of the invention is mainly used for well cementation and completion construction in oil drilling engineering, in particular to a highly deviated well and a horizontal well, and has the main functions of: firstly, the eccentric rotation guide mechanism at the lower part of the device can automatically rotate an angle and search the direction of a well hole through contact extrusion with the well wall in an irregular well section, a large-inclination or a horizontal well hole, so that the safe running-in of a pipe string is realized; and secondly, the middle part of the device is specially designed with a weldless integral elastic righting mechanism, the outer diameter of the weldless integral elastic righting mechanism is slightly larger than the size of a drill bit, so that the casing string can be automatically centered in a big-belly well section, a big inclination and a horizontal well section, and the eccentric rotation guide mechanism at the lower part is assisted to find the direction of a well hole, so that the pipe string can be more easily and safely lowered to a designed position.
In summary, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical teaching of the present invention, but these embodiments are included in the scope of the present invention.
Claims (8)
1. A self-centering rotary guide device is characterized by comprising an eccentric rotary guide mechanism and an elastic righting mechanism;
the eccentric rotation guide mechanism comprises a rotation guide shoe body and an eccentric guide head, wherein the rotation guide shoe body is of a tubular structure; the eccentric seeker is of a hollow structure, one end of the eccentric seeker is of an asymmetric eccentric arc hat-shaped structure, a plurality of circulation holes are formed in the center and the periphery of the end, the other end of the eccentric seeker is provided with a step which is hollow inside, and the step is rotatably arranged at the lower end of the rotary guide shoe body;
the elastic righting mechanism comprises a casing pipe short section and an integral elastic righting device, wherein the lower end of the casing pipe short section is fixedly connected with the upper end of the rotary guide shoe body, the casing pipe short section and the rotary guide shoe body are coaxially arranged, and the inner cavities of the casing pipe short section and the rotary guide shoe body are communicated; integral elasticity centralizer includes the integrative last ring body of making, lower ring body and a plurality of piece of rightting, every piece of rightting is the arc platelike structure that has elasticity, and a plurality of circumference equipartitions of righting the outside salient in middle part of the piece are right between last ring body and lower ring body, go up the ring body and down the ring body suit on the outer wall of sleeve pipe nipple joint correspondingly from top to bottom, go up the ring body and be in free state and can freely move at sleeve pipe nipple joint within range, the ring body is close to rotatory guide shoe body setting and the ring body is injectd on the sleeve pipe nipple joint down.
2. The self-centering rotary guide device according to claim 1, wherein an annular first ball groove is formed on an outer wall of the step of the eccentric guide head, an annular second ball groove is formed on an inner wall of a lower end of the rotary guide body, the first ball groove and the second ball groove are correspondingly arranged inside and outside each other, and a plurality of rotary balls are further mounted between the first ball groove and the second ball groove to realize the rotary connection between the rotary guide body and the eccentric guide head.
3. The self-centering rotary guide device of claim 1, wherein the rotary guide shoe body and the step of the eccentric guide head are rotatably mounted together by a ball bearing.
4. The self-centering rotary guide device of claim 1, wherein the integral resilient centralizer is made of alloy steel tube by laser integral cutting and press forming.
5. The self-centering rotary guide device of claim 1, wherein the integral resilient centralizer has a normal maximum outer diameter slightly larger than the maximum outer diameter of the drill bit.
6. The self-centering rotary guide device according to claim 1, wherein a snap ring is fitted into a lower portion of an outer wall of the casing nipple, and an outer diameter of the snap ring is larger than an inner diameter of the lower ring body and serves to restrain the lower ring body between the snap ring and the rotary guide body.
7. The self-centering rotary guide device of claim 6, wherein the lower portion of the outer wall of the snap ring is tapered and fits against the inner surface of the connection between the lower ring and the centering plate.
8. The self-centering rotary guide device of claim 1, wherein the casing sub is threadably connected to the rotary guide body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010348489.7A CN111535756A (en) | 2020-04-28 | 2020-04-28 | Self-centering rotary guide device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010348489.7A CN111535756A (en) | 2020-04-28 | 2020-04-28 | Self-centering rotary guide device |
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| Publication Number | Publication Date |
|---|---|
| CN111535756A true CN111535756A (en) | 2020-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010348489.7A Pending CN111535756A (en) | 2020-04-28 | 2020-04-28 | Self-centering rotary guide device |
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| CN (1) | CN111535756A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412379A (en) * | 2020-12-22 | 2021-02-26 | 中国石油天然气集团有限公司 | Rotary milling guide shoe for petroleum drilling and rotary milling method thereof |
| CN114753805A (en) * | 2022-05-12 | 2022-07-15 | 河间市惠东钻采配件有限公司 | Multifunctional scraping eccentric guider |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201650148U (en) * | 2010-03-03 | 2010-11-24 | 张治国 | Integral casing centralizer |
| CN202627989U (en) * | 2012-06-21 | 2012-12-26 | 张俊清 | Integral-type elastic centralizer |
| CN203239246U (en) * | 2013-03-15 | 2013-10-16 | 中国石油天然气集团公司 | Hydraulic control arch centering device for continuous tube |
| CN203515464U (en) * | 2013-09-16 | 2014-04-02 | 中国石油天然气股份有限公司 | Well cementing device |
| CN105840116A (en) * | 2016-05-05 | 2016-08-10 | 中国石油集团渤海钻探工程有限公司 | Eccentric-type hydraulic rotating guide shoe |
| CN205714167U (en) * | 2016-02-25 | 2016-11-23 | 山西地宝科技股份有限公司 | A kind of drilling track monitor anti-deviation device |
| CN207420537U (en) * | 2017-10-18 | 2018-05-29 | 中国石油集团渤海钻探工程有限公司 | Self-aiming rotates float shoe |
| CN209212176U (en) * | 2018-11-07 | 2019-08-06 | 中国石油天然气股份有限公司 | Casing guide shoe for horizontal well screen |
| US20190316430A1 (en) * | 2018-04-17 | 2019-10-17 | Russell P. Rutledge | Multi-piece rod guide for wells |
| CN209855723U (en) * | 2019-02-26 | 2019-12-27 | 杰瑞能源服务有限公司 | High-resistance rotary guide shoe |
-
2020
- 2020-04-28 CN CN202010348489.7A patent/CN111535756A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201650148U (en) * | 2010-03-03 | 2010-11-24 | 张治国 | Integral casing centralizer |
| CN202627989U (en) * | 2012-06-21 | 2012-12-26 | 张俊清 | Integral-type elastic centralizer |
| CN203239246U (en) * | 2013-03-15 | 2013-10-16 | 中国石油天然气集团公司 | Hydraulic control arch centering device for continuous tube |
| CN203515464U (en) * | 2013-09-16 | 2014-04-02 | 中国石油天然气股份有限公司 | Well cementing device |
| CN205714167U (en) * | 2016-02-25 | 2016-11-23 | 山西地宝科技股份有限公司 | A kind of drilling track monitor anti-deviation device |
| CN105840116A (en) * | 2016-05-05 | 2016-08-10 | 中国石油集团渤海钻探工程有限公司 | Eccentric-type hydraulic rotating guide shoe |
| CN207420537U (en) * | 2017-10-18 | 2018-05-29 | 中国石油集团渤海钻探工程有限公司 | Self-aiming rotates float shoe |
| US20190316430A1 (en) * | 2018-04-17 | 2019-10-17 | Russell P. Rutledge | Multi-piece rod guide for wells |
| CN209212176U (en) * | 2018-11-07 | 2019-08-06 | 中国石油天然气股份有限公司 | Casing guide shoe for horizontal well screen |
| CN209855723U (en) * | 2019-02-26 | 2019-12-27 | 杰瑞能源服务有限公司 | High-resistance rotary guide shoe |
Non-Patent Citations (2)
| Title |
|---|
| 王合林等: "华北油田水平井完井固井技术", 《石油钻采工艺》 * |
| 黄桢等: "《川渝地区页岩气水平井钻完井技术》", 31 October 2018, 重庆大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412379A (en) * | 2020-12-22 | 2021-02-26 | 中国石油天然气集团有限公司 | Rotary milling guide shoe for petroleum drilling and rotary milling method thereof |
| CN112412379B (en) * | 2020-12-22 | 2023-02-17 | 中国石油天然气集团有限公司 | Rotary milling guide shoe for petroleum drilling and rotary milling method thereof |
| CN114753805A (en) * | 2022-05-12 | 2022-07-15 | 河间市惠东钻采配件有限公司 | Multifunctional scraping eccentric guider |
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Application publication date: 20200814 |