US2228648A - Casing centralizer - Google Patents
Casing centralizer Download PDFInfo
- Publication number
- US2228648A US2228648A US296099A US29609939A US2228648A US 2228648 A US2228648 A US 2228648A US 296099 A US296099 A US 296099A US 29609939 A US29609939 A US 29609939A US 2228648 A US2228648 A US 2228648A
- Authority
- US
- United States
- Prior art keywords
- springs
- casing
- centralizer
- stop
- members
- 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.)
- Expired - Lifetime
Links
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000003643 water by type 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
- E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
- E21B17/1021—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs
- E21B17/1028—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well with articulated arms or arcuate springs with arcuate springs only, e.g. baskets with outwardly bowed strips for cementing operations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/27—Centerer
Definitions
- This invention relates to casing centralizers, being particularly concerned with centralizers of the spring type, which tend to maintain the-casing centered in the bore hole.
- Such centering is desirable and important to ensure that a uniform thickness of cement will be deposited around the casing for the purpose of providing an effective cementitious seal against the passage of encroaching waters or other fluids into the well or casing.
- tc provide an improved casing centralizer which is always being pulled through the casing or hole regardless of the direction in which the casing is being moved.
- Still a further object of the invention is to so shape the bowed springs of a casing centralizer as to obtain, an increased contacting surface with the formation, as well as a more uniform distribution of the load over a greater or longer portion of the spring.
- Figure '1 is a side elevational view of a centralizer prior to its assembly on a casing
- Figure 2 is a view similar to Figure 1, showing the centralizer assembled on a casing within a bore;
- Figure 3 is a section taken along the line 33 of Figure 1;
- Figure 4 is a fragmentary, partially sectional view of a modified form of centralizer.
- Figure 5 is a front elevation of a leaf spring forming part of the centralizer disclosed in Figure 4.
- the invention contemplates the provision of a casing centralizer embodying outwardly bowed leaf springs secured to spaced collars. Stop rings are secured to the well casing for abutting engagement with companion stops formed on the leaf springs, so that regardless of whether the casing is being lowered or raised in the hole, one of the stops will engage the springs to pull them and their associated collars through the hole, and not push them through the hole.
- the casing centralizer A consistsof spaced upper and lower collars l0, II to which a plurality of circularly spaced and outwardly bowed leaf springs 12 are secured by welding material I3 or other suitable means.
- the ends M of each spring extend beyond the collars and are inwardly bent to provide stops I 5 adapted to contact stop rings I611, liib, each of which is placed between the outer end of an associated collar IE or II and the bent leaf portions I 5.
- Each ring Isa or liib has substantially the same internal diameter as the collars, but is initially provided with a split H to permit its insertion between the bent portions l5jand a collar after the leaves have been securely welded in assembled position. Subsequent to the provision of.
- the entire assembly is slid or placed over a casing B and the stop rings moved to positions abutting the bent spring portions. Thereafter, the stop rings are securely attached to the casing by depositing welding material 18 around holes I9 provided in the rings and also by welding the adjacent ring ends which define the split i1 together.
- a clearance space 20 remains between it and the neighboring collar. This space is allowed to permit the bowed central parts of the springs 12 to move inwardly upon their encountering of obstructions or restrictions in the casing or hole I through which they are passing, which movement produceslongitudinal motion of a collar towards its stop ring.
- the various parts are arranged and the clearance space predetermined to pe. rit complete inward movement of the bowed portions of the spring into engagement with the casing without any restraints being imposed by the abutting of a slidable collar III or II with a stop ring Ilia or llib.
- the upper stop "in would be effective against the upper bent portions l5 of the springs to pull the centralizer through the hole and past any obstructions by assistingand permitting the bowed spring portions I2 to move inwardly toward the casing B on which the centralizer A is mounted. Accordingly, regardless of the direction in which the casing and centralizer are being moved through the hole, the.
- centralizer springs will always be pulled and not pushed past obstructions or restrictions, avoiding the detrimental effects'caused by the application of compressive forces or a pushing action against the centralizer, which will cause the springs to buckle and collapse outwardly.
- can be secured, as by welding, to the median spring portions and arranged to conform generally to the curvature of the hole.
- This increased bearing area not only offers resistance to the tendency, of the leaves to dig into the formation, but it also increases the bending moment of the springs and causes the leaves to flatten out against the walls of the hole upon forcing of the leaves inwardly towards the casing B on which the centralizer A is mounted.
- each leaf spring As disclosed in Figure 5.
- the leaf I2a gradually increases in width from the collars III, II towards its center or mid-point 22.
- This arrangement 'not only provides a larger bearing area in the center region 22, but also causes the spring l2a to be flattened over a greater portion of its length upon' being subjected to inward thrust ,due to a decrease in hole diameter or restrictions.
- the accompanying increased bearing area' maintains the unit bearing pressure upon the formation at a low value despite the increased total load, which oflsets any tendency towards digging into the formation, which might'occur were the springs to maintain a bowed configuration and flatten only slightly of the centralizer springs l2 and collars III, ll.
- a centering device including a pair of spaced members, outwardly bowed springs fastened to said members, and a pair of stops movable with respect to said springs, one or the other of said stops being engageable with said springs to exert pulling effort thereon regardless of the direction of longitudinal movement of said stops.
- a centering device including a pair of spaced, generally cylindrical members, outwardly bowed springs fastened at intervals circumferentially around said members and extending therebeyond, and a stop between each cylindrical member and the adjoining ends of said springs, the leading stop being engageable with said springs to exert a pulling action thereon regardless of the direction of longitudinal movement of said s ops.
- a centering device including a pair of spaced, generally cylindrical members, outwardly bowed springs circumferentially arranged around said members and secured thereto, said springs extending beyond said members with their terminal portions bent to form abutments spaced longitudinally from said cylindrical members, and stop means between each member and its associated spaced abutments, said stop means being of lesslength than the distance between said member and abutments.
- a centering device including a pair of spaced, generally cylindrical members, outwardly bowed springs circumferentially arranged around said members and secured thereto, said springs extending beyond said members with their terminal portions disposed inwardly to form abutments spaced longitudinally from said cylindrical members, and an annular stop between each member and its associated spaced abutments, said stop beingof less length than the distance between said member and abutments.
- a centering device including a pair of spaced, generally cylindrical members slidable on said casing, outwardly bowed springs circumferentially arranged around said members and secured thereto, said springs extending beyond said members with their terminal portions disposed inwardly to form abutments spaced longitudinally from said cylindrical members, and an annular stop secured to said casing between each member and its associated spaced abutments, each of said stops being contiguous its abutments when said springs are in their outermost'position and-spaced from its cylindrical member by a distance sufli-. cient to permit maximum inward-movement of said springs toward said casing and unrestrained sliding of said member toward said stop.
- a centering device including a pair of spaced, generally cylindrical members, bowed springs fastened at intervals circumferentially around said members and extending therebeyond, and a stop between each cylindrical member and the adjoining ends or said springs, one or the other of said stops being engageable with said springs to exert a pulling action thereon regardless of the direction of longitudinal movement of said stops.
- a centering device including a pair of spaced members, bowed springs fastened at intervals to said members and extending therebeyond, and a stop between each member and the adjoining ends of said springs, one or the other or said stops being engageable with said springs to exert a pulling action thereon regardless of the direction of longitudinal movement of-said stops.
- a centering device including a pair of spaced members, bowed springs fastened to said members, and a pair of stops movable longitudinally of said springs, the leading stop being engageable with said springs to exert pulling effort thereon regardless of the direction of longitudinal-movement of said stops.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Description
, UNITED STATES PATENT OFFICE CASING CENTRALIZER Application September 22, 1939, Serial No. 296,099
8 Claims.
This invention relates to casing centralizers, being particularly concerned with centralizers of the spring type, which tend to maintain the-casing centered in the bore hole. Such centering is desirable and important to ensure that a uniform thickness of cement will be deposited around the casing for the purpose of providing an effective cementitious seal against the passage of encroaching waters or other fluids into the well or casing.
In the form of casing centralizers which embody outwardly bowed leaf springs yieldably engageable with the sides of the casing or hole, it is preferred that these springs be pulled and not pushed through any restrictions or obstructions as the casing is being raised or lowered in the hole. The pulling action assists in moving the outwardly bowed springs to an inward position permitting them to pass the restriction or obstruction with greater facility. If;='the centralizer and its outwardly bowed springs were placed under compression, or pushed, as the casing was moved through the hole, the springs would tend to buckle or collapse upon engaging an obstruction or restriction, effecting an increase in their diameter and in many cases preventing the passage of the centralizer. Attempts to move beyond the obstruction with this last-mentioned arrangement oftentimes cause failure of the springs and their consequent unavailability for further use as a centering device for the casing.
Accordingly, it is an object of this invention tc provide an improved casing centralizer which is always being pulled through the casing or hole regardless of the direction in which the casing is being moved.
It is a further object of the invention to increase the bearing area of the spring arms against the sides of the hole to minimize their tendency to dig into the formation.
Still a further object of the invention is to so shape the bowed springs of a casing centralizer as to obtain, an increased contacting surface with the formation, as well as a more uniform distribution of the load over a greater or longer portion of the spring.
The invention has other objects that will become apparent from a consideration of the embodiments shown in the drawing accompanying sndforming part of the present specification. These forms will now be described in detail, but it is to be understood that such detailed description isnot to be taken in a limited sense, since the scope of the invention is best defined by the appended claims.
Referring -to the drawing:
Figure '1 is a side elevational view of a centralizer prior to its assembly on a casing;
Figure 2 is a view similar to Figure 1, showing the centralizer assembled on a casing within a bore;
Figure 3 is a section taken along the line 33 of Figure 1;
Figure 4 is a fragmentary, partially sectional view of a modified form of centralizer; and
Figure 5 is a front elevation of a leaf spring forming part of the centralizer disclosed in Figure 4.
In its general aspects, the invention contemplates the provision of a casing centralizer embodying outwardly bowed leaf springs secured to spaced collars. Stop rings are secured to the well casing for abutting engagement with companion stops formed on the leaf springs, so that regardless of whether the casing is being lowered or raised in the hole, one of the stops will engage the springs to pull them and their associated collars through the hole, and not push them through the hole.
More specifically, the casing centralizer A consistsof spaced upper and lower collars l0, II to which a plurality of circularly spaced and outwardly bowed leaf springs 12 are secured by welding material I3 or other suitable means. The ends M of each spring extend beyond the collars and are inwardly bent to provide stops I 5 adapted to contact stop rings I611, liib, each of which is placed between the outer end of an associated collar IE or II and the bent leaf portions I 5. Each ring Isa or liib has substantially the same internal diameter as the collars, but is initially provided with a split H to permit its insertion between the bent portions l5jand a collar after the leaves have been securely welded in assembled position. Subsequent to the provision of. the stop rings Ilia, 16b between the bent springportions I5 and the collars l0, II, the entire assembly is slid or placed over a casing B and the stop rings moved to positions abutting the bent spring portions. Thereafter, the stop rings are securely attached to the casing by depositing welding material 18 around holes I9 provided in the rings and also by welding the adjacent ring ends which define the split i1 together.
It'will be noted that when a stop ring lfia or Ifib engages its cooperative bent spring stops IS a clearance space 20 remains between it and the neighboring collar. This space is allowed to permit the bowed central parts of the springs 12 to move inwardly upon their encountering of obstructions or restrictions in the casing or hole I through which they are passing, which movement produceslongitudinal motion of a collar towards its stop ring. The various parts are arranged and the clearance space predetermined to pe. rit complete inward movement of the bowed portions of the spring into engagement with the casing without any restraints being imposed by the abutting of a slidable collar III or II with a stop ring Ilia or llib.
The manner in which the centralizer A functions in the hole will now become apparent. Since the stop rings lia, llib are welded to the casing B, downward movement of this casing and centralizer will cause the lower stop ring lBb to engage the lower bent portions l5 of the springs, and thus produce a pulling force upon the bowed springs should they encounter obst'ructions or restrictions in the'hole, thereby assisting and allowing them to move inwardly toward the casing B. During this downward movement, the upper stop ring lia is ineffective, but because of the clearance space 20 between it and its adjoining collar ID the latter can move longitudinally upwards without restraint upon inward movement of the springs. Were the movement of the casing B reversed, the upper stop "in would be effective against the upper bent portions l5 of the springs to pull the centralizer through the hole and past any obstructions by assistingand permitting the bowed spring portions I2 to move inwardly toward the casing B on which the centralizer A is mounted. Accordingly, regardless of the direction in which the casing and centralizer are being moved through the hole, the.
centralizer springs will always be pulled and not pushed past obstructions or restrictions, avoiding the detrimental effects'caused by the application of compressive forces or a pushing action against the centralizer, which will cause the springs to buckle and collapse outwardly.
Due to the yieldability of the springs 12, the
casing B will be maintained centeredin the hole,
not onlywhile being moved to its intended position but also during a cementing operation, al-
- lowing a uniform thickness-of cement to be formed around the casing. I
For the purpose of minimizing or preventing the outwardly bowed portions of the leaf springs I! from digging into the sides of the hole, bearing leaves 2| can be secured, as by welding, to the median spring portions and arranged to conform generally to the curvature of the hole. This increased bearing area not only offers resistance to the tendency, of the leaves to dig into the formation, but it also increases the bending moment of the springs and causes the leaves to flatten out against the walls of the hole upon forcing of the leaves inwardly towards the casing B on which the centralizer A is mounted.
This last named function is also obtainable by forming each leaf spring as disclosed in Figure 5. The leaf I2a gradually increases in width from the collars III, II towards its center or mid-point 22. This arrangement 'not only provides a larger bearing area in the center region 22, but also causes the spring l2a to be flattened over a greater portion of its length upon' being subjected to inward thrust ,due to a decrease in hole diameter or restrictions. The accompanying increased bearing area' maintains the unit bearing pressure upon the formation at a low value despite the increased total load, which oflsets any tendency towards digging into the formation, which might'occur were the springs to maintain a bowed configuration and flatten only slightly of the centralizer springs l2 and collars III, ll.
This eflect is permitted since the stop rings I611, "5b are free to rotate with the casing 13 within the centralizer springs. As a result, when rotation of the casing becomes desirable or essential, no fear need be had that the leaves will prevent such movement by the digging of the springs into the formation.
I claim:
1. A centering device, including a pair of spaced members, outwardly bowed springs fastened to said members, and a pair of stops movable with respect to said springs, one or the other of said stops being engageable with said springs to exert pulling effort thereon regardless of the direction of longitudinal movement of said stops.
2. A centering device, including a pair of spaced, generally cylindrical members, outwardly bowed springs fastened at intervals circumferentially around said members and extending therebeyond, and a stop between each cylindrical member and the adjoining ends of said springs, the leading stop being engageable with said springs to exert a pulling action thereon regardless of the direction of longitudinal movement of said s ops.
3. A centering device, including a pair of spaced, generally cylindrical members, outwardly bowed springs circumferentially arranged around said members and secured thereto, said springs extending beyond said members with their terminal portions bent to form abutments spaced longitudinally from said cylindrical members, and stop means between each member and its associated spaced abutments, said stop means being of lesslength than the distance between said member and abutments.
4. A centering device, including a pair of spaced, generally cylindrical members, outwardly bowed springs circumferentially arranged around said members and secured thereto, said springs extending beyond said members with their terminal portions disposed inwardly to form abutments spaced longitudinally from said cylindrical members, and an annular stop between each member and its associated spaced abutments, said stop beingof less length than the distance between said member and abutments.
5. In combination with a casing, a centering device including a pair of spaced, generally cylindrical members slidable on said casing, outwardly bowed springs circumferentially arranged around said members and secured thereto, said springs extending beyond said members with their terminal portions disposed inwardly to form abutments spaced longitudinally from said cylindrical members, and an annular stop secured to said casing between each member and its associated spaced abutments, each of said stops being contiguous its abutments when said springs are in their outermost'position and-spaced from its cylindrical member by a distance sufli-. cient to permit maximum inward-movement of said springs toward said casing and unrestrained sliding of said member toward said stop.
6. A centering device, including a pair of spaced, generally cylindrical members, bowed springs fastened at intervals circumferentially around said members and extending therebeyond, and a stop between each cylindrical member and the adjoining ends or said springs, one or the other of said stops being engageable with said springs to exert a pulling action thereon regardless of the direction of longitudinal movement of said stops.
7. A centering device, including a pair of spaced members, bowed springs fastened at intervals to said members and extending therebeyond, and a stop between each member and the adjoining ends of said springs, one or the other or said stops being engageable with said springs to exert a pulling action thereon regardless of the direction of longitudinal movement of-said stops.
8. A centering device, including a pair of spaced members, bowed springs fastened to said members, and a pair of stops movable longitudinally of said springs, the leading stop being engageable with said springs to exert pulling effort thereon regardless of the direction of longitudinal-movement of said stops.
JULIEN A. WELLES.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US296099A US2228648A (en) | 1939-09-22 | 1939-09-22 | Casing centralizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US296099A US2228648A (en) | 1939-09-22 | 1939-09-22 | Casing centralizer |
Publications (1)
Publication Number | Publication Date |
---|---|
US2228648A true US2228648A (en) | 1941-01-14 |
Family
ID=23140600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US296099A Expired - Lifetime US2228648A (en) | 1939-09-22 | 1939-09-22 | Casing centralizer |
Country Status (1)
Country | Link |
---|---|
US (1) | US2228648A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2547481A (en) * | 1945-05-01 | 1951-04-03 | Mcdonald Company | Beverage dispensing apparatus with recirculating means |
US2562083A (en) * | 1948-10-01 | 1951-07-24 | Baker Oil Tools Inc | Casing centralizer |
US2583044A (en) * | 1949-12-06 | 1952-01-22 | Charles W Earl | Scraper for removing paraffin from oil well pipes |
US2605844A (en) * | 1950-10-30 | 1952-08-05 | Baker Oil Tools Inc | Casing centralizer |
US2636564A (en) * | 1952-02-01 | 1953-04-28 | Kluck Louis | Rib type casing centralizer |
US2640544A (en) * | 1949-12-27 | 1953-06-02 | Baker Oil Tools Inc | Casing centralizer |
US2727576A (en) * | 1952-04-09 | 1955-12-20 | Jesse E Hall | Centralizers |
US3196952A (en) * | 1962-06-20 | 1965-07-27 | B & W Inc | Well pipe centering and fluid flowcourse controlling device |
US3240274A (en) * | 1965-02-17 | 1966-03-15 | B & W Inc | Flexible turbulence device for well pipe |
US3289767A (en) * | 1961-11-03 | 1966-12-06 | B & W Inc | Well centering and cementing device |
US20090166027A1 (en) * | 2007-12-27 | 2009-07-02 | Ossama Ramzi Sehsah | Wellbore pipe centralizer having increased restoring force and self-sealing capability |
USD849800S1 (en) | 2012-04-04 | 2019-05-28 | Summit Energy Services, Inc. | Casing centralizer having spiral blades |
WO2020095050A1 (en) * | 2018-11-08 | 2020-05-14 | Vulcan Completion Products Uk Limited | Centraliser |
US20220275691A1 (en) * | 2019-08-01 | 2022-09-01 | Chevron U.S.A. Inc. | Artificial lift systems utilizing high speed centralizers |
-
1939
- 1939-09-22 US US296099A patent/US2228648A/en not_active Expired - Lifetime
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2547481A (en) * | 1945-05-01 | 1951-04-03 | Mcdonald Company | Beverage dispensing apparatus with recirculating means |
US2562083A (en) * | 1948-10-01 | 1951-07-24 | Baker Oil Tools Inc | Casing centralizer |
US2583044A (en) * | 1949-12-06 | 1952-01-22 | Charles W Earl | Scraper for removing paraffin from oil well pipes |
US2640544A (en) * | 1949-12-27 | 1953-06-02 | Baker Oil Tools Inc | Casing centralizer |
US2605844A (en) * | 1950-10-30 | 1952-08-05 | Baker Oil Tools Inc | Casing centralizer |
US2636564A (en) * | 1952-02-01 | 1953-04-28 | Kluck Louis | Rib type casing centralizer |
US2727576A (en) * | 1952-04-09 | 1955-12-20 | Jesse E Hall | Centralizers |
US3289767A (en) * | 1961-11-03 | 1966-12-06 | B & W Inc | Well centering and cementing device |
US3196952A (en) * | 1962-06-20 | 1965-07-27 | B & W Inc | Well pipe centering and fluid flowcourse controlling device |
US3240274A (en) * | 1965-02-17 | 1966-03-15 | B & W Inc | Flexible turbulence device for well pipe |
US20090166027A1 (en) * | 2007-12-27 | 2009-07-02 | Ossama Ramzi Sehsah | Wellbore pipe centralizer having increased restoring force and self-sealing capability |
US7708064B2 (en) * | 2007-12-27 | 2010-05-04 | At Balance Americas, Llc | Wellbore pipe centralizer having increased restoring force and self-sealing capability |
USD849800S1 (en) | 2012-04-04 | 2019-05-28 | Summit Energy Services, Inc. | Casing centralizer having spiral blades |
USD983231S1 (en) | 2012-04-04 | 2023-04-11 | Summit Casing Services, Llc | Casing centralizer having spiral blades |
WO2020095050A1 (en) * | 2018-11-08 | 2020-05-14 | Vulcan Completion Products Uk Limited | Centraliser |
GB2578774A (en) * | 2018-11-08 | 2020-05-27 | Vulcan Completion Products Uk Ltd | Centraliser |
CN113286931A (en) * | 2018-11-08 | 2021-08-20 | 伏尔甘完全产品英国有限公司 | Centering guide |
US11555357B2 (en) | 2018-11-08 | 2023-01-17 | Vulcan Completion Products Uk Limited | Centraliser |
GB2578774B (en) * | 2018-11-08 | 2023-05-10 | Vulcan Completion Products Uk Ltd | Centraliser |
US20220275691A1 (en) * | 2019-08-01 | 2022-09-01 | Chevron U.S.A. Inc. | Artificial lift systems utilizing high speed centralizers |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2228648A (en) | Casing centralizer | |
US7140432B2 (en) | Dual diameter and rotating centralizer/sub and method | |
AU2012206440B2 (en) | Centraliser | |
US2797756A (en) | Well tool mounting | |
US1898074A (en) | Antifriction bearing | |
US7845061B2 (en) | Low clearance centralizer and method of making centralizer | |
US4127168A (en) | Well packers using metal to metal seals | |
US3278192A (en) | Sealing devices | |
US7156171B2 (en) | Dual diameter and rotating centralizer/sub | |
US2612953A (en) | Packer | |
US2845128A (en) | Casing centralizer and wall scratcher | |
US4030858A (en) | Multi-stage rabbit | |
EP3164568B1 (en) | Centralizer device and method for deployment of a bore hole component in a borehole | |
US1820391A (en) | Stabilizer | |
US2828824A (en) | Stop devices for well conduits | |
US3575239A (en) | Progressive centralizer | |
US2174085A (en) | Centering device | |
US2117538A (en) | Cement basket | |
WO2015017212A1 (en) | Rolled tubular centralizer | |
US1824257A (en) | Tool joint | |
US2886111A (en) | Centralizer | |
US20170211348A1 (en) | Elastically deformable support for an expandable seal element of a downhole tool | |
US2683491A (en) | Scratcher for well bores | |
US2903073A (en) | Cement conditioner for well walls | |
WO2016162771A1 (en) | A centralizer with low friction buttons and method of fabrication thereof |