CA2225894C - Improved sucker rod guide bearing - Google Patents
Improved sucker rod guide bearing Download PDFInfo
- Publication number
- CA2225894C CA2225894C CA 2225894 CA2225894A CA2225894C CA 2225894 C CA2225894 C CA 2225894C CA 2225894 CA2225894 CA 2225894 CA 2225894 A CA2225894 A CA 2225894A CA 2225894 C CA2225894 C CA 2225894C
- Authority
- CA
- Canada
- Prior art keywords
- wheel
- sucker rod
- guide bearing
- coupling
- rod guide
- 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 - Fee Related
Links
- 230000008878 coupling Effects 0.000 claims abstract description 52
- 238000010168 coupling process Methods 0.000 claims abstract description 52
- 238000005859 coupling reaction Methods 0.000 claims abstract description 52
- 238000005461 lubrication Methods 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 229920006375 polyphtalamide Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 10
- 239000004576 sand Substances 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000004956 Amodel Substances 0.000 description 3
- 239000004954 Polyphthalamide Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- E21B17/1071—Wear protectors; Centralising devices, e.g. stabilisers specially adapted for pump rods, e.g. sucker rods
-
- 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
- E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve
- E21B17/1064—Pipes or rods with a relatively rotating sleeve
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Hydraulic Turbines (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
A sucker rod guide bearing with a cylindrical shaft having a threaded stud at each end is connected by couplings to adjacent sucker rods. The coupling has a flat end surface which directly contacts the shoulder of the guide bearing and provides for the transmission of the guide bearing. A vaned cylindrical wheel is slidably mounted over the guide bearing connecting shaft such that the wheel remains stationary while the bearing body rotates within it. The wheel has four vanes, each having a substantially semi- circular cross-section outline. Each vane has an internal lubrication groove running the length of the wheel and the wheel is notched at each end of the groove to allow passage of fluids and extraneous matters such as sand. Preferably the wheel and vanes are made of a very hard polypthalamide resin which resists sand embedment and mechanical failure.
Description
IMPROVED SUCKER ROD GUIDE BEARING
FIELD OF THE INVENTION
The present invention relates to sucker rod couplings and guide bearings.
Couplings are used to couple together sections of sucker rods for use in an oil well.
Guide bearings are used to centre the rod and minimize wear on the tubing string.
BACKGROUND OF THE INVENTION
In establishing wells for production of fluid hydrocarbon, a hole is first drilled into the ground and then logging equipment lowered into the hole and used to determine the character of the formation as a function of depth. A steel pipe or tubing, commonly referred to as casing, is then set in the bore hole down to the bottom. The casing is perforated at selected locations to allow the fluid in the formation to enter the bore hole.
In cases where the fluid is of high viscosity or where there is a relatively low pressure, it is necessary to pump the fluid out of the well. Approximately 90% of all artificial lift wells in the U.S. and Canada consist of a down hole pump connected to a surface power source by a string of sucker rods. Each sucker rod is typically 25 feet long with a diameter of 3/4" or 7/8" and is provided with a threaded pin end and shoulder at each of its ends. A
cylindrical internally threaded member, typically 4" long and 1 5/8 inches diameter is used to couple two sucker rods together. In this way a sucker rod string is made up of a number of rods and couplings with the couplings being larger in diameter than the rods.
A sucker rod string passes through a concentric tubing string consisting of 30 foot sections of tubing having an inside diameter of 2 1/2". Rotation or up and down reciprocating motion of the sucker rods activate the pumps depending on the type of pump employed. In rotary systems, the pump used is often a positive cavity displacement pump which consists of two mating pieces, one being stationary and the other rotating so as to create a chain of cavities moving from the bottom of the assembly to the top.
Such systems have the capability to remove troublesome sand and other solids from the bole hole as well as being able to achieve high lifts at slow rotation speeds. Typical rotation speeds encountered are in the area of 600 revolutions per minute at depths of up to 4,000 feet.
Various types of couplings between sections of sucker rods are employed to centralize the sucker rod string. One common type of coupling has an exterior hard surface that turns with the rod and tends to wear out the casing. An elastomeric material is sometimes bonded to the outer surface of the coupling to reduce the wear of the casing which is more expensive and difficult to replace than is the coupling. Couplings having an elastomeric outer surface provide only a partial solution to wearing through of the casing in as much as the elastomeric surface wears away quickly and then the coupling must be replaced or be resurfaced.
U.S. Pat. No. 4,757,861 issued to Klyne discloses a sucker rod coupling assembly having a free turning vaned wheel of soft resilient material, a steel shaft with soft resilient sleeve bonded thereto and coupling and faces with soft resilient rings bonded to the ends thereof. The sleeve and rings prevent sand from reaching and abrading the steel surfaces of the shaft and coupling end faces. However, given than the sleeve and rings are soft and resilient, the torque transfer takes place across the stud threads rather than across the rings and sleeve to the steel shaft. Moreover, excessive wear or breaking of the wheel places the steel box end couplings in contact with the well casing or tubing resulting in wearing of the latter rather than the couplings.
U.S. Patent No. 4,919,202 issued to Clintberg discloses a sucker rod guide bearing having a vaned cylindrical wheel slidably mounted over a bearing body which is connected by couplings to adjacent lengths of sucker rod.
The vaned wheel in Clintberg spaces the coupling away from the sides of the casing and reduces wear on the casing by remaining stationery while the bearing body rotates within it. Figure 1 is sectional view of the prior art Clintberg sucker rod guide bearing and Figure 2 is a sectional view taken through the bearing wheel and casing. Torque is transferred from sucker rod to a coupling, to a torque transfer washer, to a central body, to a lower torque transfer washer, through another coupling and finally to the adjacent sucker rod. The torque transfer washers are necessary because attaching a standard coupling to the central body does not provide sufficient contact area for effective torque transfer. The washers also provide alternative sacrificial wear surfaces in the event the vaned wheel wears or breaks away. As may be seen in Figure 2, the vaned wheel permits through-flow of fluid between the vanes and the casing.
The sucker rod guide bearing disclosed in U.S. Patent No. 4,919,202 may be improved upon further. It was found that sand would embed in the vaned wheel in between the wheel and the connecting shaft (referred to as the central body in the '202 Patent).
As the connecting shaft rotated, the embedded sand would quickly abrade the connecting shaft and eventually cause the wheel or the shaft to fail. Also, the use of torque transfer washers or belled couplings provided very little secondary wear surface in the event the vaned wheel was worn away or broken. Lastly, it was found that fluid flow through the vaned wheel and resistance to rotation of the wheel within the casing could be improved by altering the design of the wheel. Accordingly, there is a need in the art for an improved sucker rod guide bearing which addresses the disadvantages in the prior art.
SUMMARY OF THE INVENTION
In general terms , the invention is an improved sucker rod guide bearing,where the improvement lies in the following:
(a) the vaned wheel is improved by having only form vanes of reduced cross-sectional area and by including an internal lubrication groove with each vane;
(b) the vaned wheel is fabricated from a very hard resin which resists sand embedment and mechanical failure;
FIELD OF THE INVENTION
The present invention relates to sucker rod couplings and guide bearings.
Couplings are used to couple together sections of sucker rods for use in an oil well.
Guide bearings are used to centre the rod and minimize wear on the tubing string.
BACKGROUND OF THE INVENTION
In establishing wells for production of fluid hydrocarbon, a hole is first drilled into the ground and then logging equipment lowered into the hole and used to determine the character of the formation as a function of depth. A steel pipe or tubing, commonly referred to as casing, is then set in the bore hole down to the bottom. The casing is perforated at selected locations to allow the fluid in the formation to enter the bore hole.
In cases where the fluid is of high viscosity or where there is a relatively low pressure, it is necessary to pump the fluid out of the well. Approximately 90% of all artificial lift wells in the U.S. and Canada consist of a down hole pump connected to a surface power source by a string of sucker rods. Each sucker rod is typically 25 feet long with a diameter of 3/4" or 7/8" and is provided with a threaded pin end and shoulder at each of its ends. A
cylindrical internally threaded member, typically 4" long and 1 5/8 inches diameter is used to couple two sucker rods together. In this way a sucker rod string is made up of a number of rods and couplings with the couplings being larger in diameter than the rods.
A sucker rod string passes through a concentric tubing string consisting of 30 foot sections of tubing having an inside diameter of 2 1/2". Rotation or up and down reciprocating motion of the sucker rods activate the pumps depending on the type of pump employed. In rotary systems, the pump used is often a positive cavity displacement pump which consists of two mating pieces, one being stationary and the other rotating so as to create a chain of cavities moving from the bottom of the assembly to the top.
Such systems have the capability to remove troublesome sand and other solids from the bole hole as well as being able to achieve high lifts at slow rotation speeds. Typical rotation speeds encountered are in the area of 600 revolutions per minute at depths of up to 4,000 feet.
Various types of couplings between sections of sucker rods are employed to centralize the sucker rod string. One common type of coupling has an exterior hard surface that turns with the rod and tends to wear out the casing. An elastomeric material is sometimes bonded to the outer surface of the coupling to reduce the wear of the casing which is more expensive and difficult to replace than is the coupling. Couplings having an elastomeric outer surface provide only a partial solution to wearing through of the casing in as much as the elastomeric surface wears away quickly and then the coupling must be replaced or be resurfaced.
U.S. Pat. No. 4,757,861 issued to Klyne discloses a sucker rod coupling assembly having a free turning vaned wheel of soft resilient material, a steel shaft with soft resilient sleeve bonded thereto and coupling and faces with soft resilient rings bonded to the ends thereof. The sleeve and rings prevent sand from reaching and abrading the steel surfaces of the shaft and coupling end faces. However, given than the sleeve and rings are soft and resilient, the torque transfer takes place across the stud threads rather than across the rings and sleeve to the steel shaft. Moreover, excessive wear or breaking of the wheel places the steel box end couplings in contact with the well casing or tubing resulting in wearing of the latter rather than the couplings.
U.S. Patent No. 4,919,202 issued to Clintberg discloses a sucker rod guide bearing having a vaned cylindrical wheel slidably mounted over a bearing body which is connected by couplings to adjacent lengths of sucker rod.
The vaned wheel in Clintberg spaces the coupling away from the sides of the casing and reduces wear on the casing by remaining stationery while the bearing body rotates within it. Figure 1 is sectional view of the prior art Clintberg sucker rod guide bearing and Figure 2 is a sectional view taken through the bearing wheel and casing. Torque is transferred from sucker rod to a coupling, to a torque transfer washer, to a central body, to a lower torque transfer washer, through another coupling and finally to the adjacent sucker rod. The torque transfer washers are necessary because attaching a standard coupling to the central body does not provide sufficient contact area for effective torque transfer. The washers also provide alternative sacrificial wear surfaces in the event the vaned wheel wears or breaks away. As may be seen in Figure 2, the vaned wheel permits through-flow of fluid between the vanes and the casing.
The sucker rod guide bearing disclosed in U.S. Patent No. 4,919,202 may be improved upon further. It was found that sand would embed in the vaned wheel in between the wheel and the connecting shaft (referred to as the central body in the '202 Patent).
As the connecting shaft rotated, the embedded sand would quickly abrade the connecting shaft and eventually cause the wheel or the shaft to fail. Also, the use of torque transfer washers or belled couplings provided very little secondary wear surface in the event the vaned wheel was worn away or broken. Lastly, it was found that fluid flow through the vaned wheel and resistance to rotation of the wheel within the casing could be improved by altering the design of the wheel. Accordingly, there is a need in the art for an improved sucker rod guide bearing which addresses the disadvantages in the prior art.
SUMMARY OF THE INVENTION
In general terms , the invention is an improved sucker rod guide bearing,where the improvement lies in the following:
(a) the vaned wheel is improved by having only form vanes of reduced cross-sectional area and by including an internal lubrication groove with each vane;
(b) the vaned wheel is fabricated from a very hard resin which resists sand embedment and mechanical failure;
(c) the torque transfer contact area between the couplings and the central body or connecting shaft is enlarged by modifying the couplings.
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred embodiment of the invention will now be described with reference to the drawings in which:
Figure 1 is a sectional view of a prior art sucker rod guide bearing.
Figure 2 is a sectional view through 1-1 of the prior art sucker rod guide bearing in Figure 1.
Figure 3 is a sectional view of a portion of the preferred embodiment of the present invention showing the connecting shaft, the vaned wheel and the couplings.
Figure 4 is a sectional view taken through 4-4 of Figure 3 showing the vaned wheel and connecting shaft in cross-section within a casing.
Figure 5 is a sectional view of the modified coupling and showing the flat contact surface which abuts the connecting shaft.
DETAILED DESCRIPTION
In the following description, like referenced numbers in the different figures refer to like parts. Referring to Figure 3, there is shown a portion of well tubing including a section of a sucker rod string contained therein. The series of sucker rods (20) are interconnected by means of a sucker rod guide bearing (10) coupled at each end by a standard sucker rod coupling (18). The bearing (10) consists of central cylindrical body (12) having a shank (26) connected to a threaded stud (30). The shank (26) has a diameter less than the threaded stud (30).
The vaned wheel (14) is preferably made of an extremely hard polyphthalamide resin such as Amodel' . Amodel' is available from Amoco Polymers in Alpharetta, Georgia, .CA 02225894 1997-12-24 U.S.A. The vaned wheel (14) is fitted slidable over the cylindrical body (12) and is of a length slightly less than that of the body (12) leaving slight gaps between the wheel (14) and the upper coupling (18a) and the lower coupling (18b).
Upon tightening of the couplings (18) over the threaded studs (30) it may be seen that the end of the coupling abuts the shoulder (13) of the connecting shaft (12).
Torque is transferred from the upper coupling (18a) directly to connecting shaft (12) and directly out to the lower coupling (18b). Standard sucker rod couplings are not suitable for this purpose because the end surfaces mating or contacting with the connecting shaft shoulder (13) are bevelled or tapered. Tightening of a standard coupling will result in the shoulder (13) slipping inside the coupling and flaring the coupling outward. Accordingly, modified couplings (18) are used in the present invention. The couplings (18) are modified by "facing" the ends to provide greater flat contact area with the shoulder (13).
Figure 5 shows the faced end of the coupling (18) and the dotted line represents the outline of a standard coupling. As a result the inside diameter edge (19) of the coupling (18) contacts the shoulder (13) closer to the centre of the connecting shaft (12) than in a standard coupling. With the degree of facing shown in Fig 5., the coupling (18) is able to transmit at least 1.5 times the torque capacity of the sucker rod in the preferred embodiment.
The vaned rotatable wheel (14) is shown in cross-section Figure 4. Compared with the prior art vaned wheel (15) seen in Figure 2, there are four vanes (32), each having a flow-through lubrication groove (34) within each vane (32). The vanes (32) are also rounded in cross-section as opposed to the square shape (33) shown in the prior art Figure 2. The result of the reduced number of vanes (32) and the rounding of the vanes (32) is a reduced cross-sectional area. The increased cross-sectional area between the casing (40) and the wheel (14) permits improved through-flow of fluid (42). As well, the internal lubrication grooves (34) also allows passage of fluids and extraneous matters such as sand. The lubrication grooves (34) help prevent abrasive material build-up on the inside of the wheel (14), which extends the life of both the wheel (14) and the connecting shaft (12).
BRIEF DESCRIPTION OF THE DRAWINGS
The preferred embodiment of the invention will now be described with reference to the drawings in which:
Figure 1 is a sectional view of a prior art sucker rod guide bearing.
Figure 2 is a sectional view through 1-1 of the prior art sucker rod guide bearing in Figure 1.
Figure 3 is a sectional view of a portion of the preferred embodiment of the present invention showing the connecting shaft, the vaned wheel and the couplings.
Figure 4 is a sectional view taken through 4-4 of Figure 3 showing the vaned wheel and connecting shaft in cross-section within a casing.
Figure 5 is a sectional view of the modified coupling and showing the flat contact surface which abuts the connecting shaft.
DETAILED DESCRIPTION
In the following description, like referenced numbers in the different figures refer to like parts. Referring to Figure 3, there is shown a portion of well tubing including a section of a sucker rod string contained therein. The series of sucker rods (20) are interconnected by means of a sucker rod guide bearing (10) coupled at each end by a standard sucker rod coupling (18). The bearing (10) consists of central cylindrical body (12) having a shank (26) connected to a threaded stud (30). The shank (26) has a diameter less than the threaded stud (30).
The vaned wheel (14) is preferably made of an extremely hard polyphthalamide resin such as Amodel' . Amodel' is available from Amoco Polymers in Alpharetta, Georgia, .CA 02225894 1997-12-24 U.S.A. The vaned wheel (14) is fitted slidable over the cylindrical body (12) and is of a length slightly less than that of the body (12) leaving slight gaps between the wheel (14) and the upper coupling (18a) and the lower coupling (18b).
Upon tightening of the couplings (18) over the threaded studs (30) it may be seen that the end of the coupling abuts the shoulder (13) of the connecting shaft (12).
Torque is transferred from the upper coupling (18a) directly to connecting shaft (12) and directly out to the lower coupling (18b). Standard sucker rod couplings are not suitable for this purpose because the end surfaces mating or contacting with the connecting shaft shoulder (13) are bevelled or tapered. Tightening of a standard coupling will result in the shoulder (13) slipping inside the coupling and flaring the coupling outward. Accordingly, modified couplings (18) are used in the present invention. The couplings (18) are modified by "facing" the ends to provide greater flat contact area with the shoulder (13).
Figure 5 shows the faced end of the coupling (18) and the dotted line represents the outline of a standard coupling. As a result the inside diameter edge (19) of the coupling (18) contacts the shoulder (13) closer to the centre of the connecting shaft (12) than in a standard coupling. With the degree of facing shown in Fig 5., the coupling (18) is able to transmit at least 1.5 times the torque capacity of the sucker rod in the preferred embodiment.
The vaned rotatable wheel (14) is shown in cross-section Figure 4. Compared with the prior art vaned wheel (15) seen in Figure 2, there are four vanes (32), each having a flow-through lubrication groove (34) within each vane (32). The vanes (32) are also rounded in cross-section as opposed to the square shape (33) shown in the prior art Figure 2. The result of the reduced number of vanes (32) and the rounding of the vanes (32) is a reduced cross-sectional area. The increased cross-sectional area between the casing (40) and the wheel (14) permits improved through-flow of fluid (42). As well, the internal lubrication grooves (34) also allows passage of fluids and extraneous matters such as sand. The lubrication grooves (34) help prevent abrasive material build-up on the inside of the wheel (14), which extends the life of both the wheel (14) and the connecting shaft (12).
The use of Amodel' or similar polyphthalamide resins as the wheel material significantly increases wheel life by resisting sand embedment and offers a significantly lower co-efficient friction between the wheel (14) and the connecting shaft (12).
The Rockwell Hardness of the resin used in the preferred embodiment is 120 on the R Scale.
The vaned wheel (14) of the preferred embodiment is a further improvement in that it is less prone to rotation within the casing (40) as the sucker rod string rotates in normal operation. In normal use, the wheel (14) rests against the casing (40). The increased resistance to rotation is a result of a wider stance between the two points of contact between the wheel (14) and the casing ( shown as A and B in Figure 4). It is readily seen that the stance A - B is close to 90 degrees of the circumference of the casing (40) whereas in the prior art shown in Figure 2, the stance is approximately 30 degrees.
In the event the vanes (32) of the wheel (14) wear down significantly or the wheel (14) breaks, the outer cylindrical surface (19) of the sucker rod couplings (18a, 18b) act as alternative sacrificial surfaces. As shown in prior art Figure 1, the sacrificial surface consisted only of torque transfer washer (16). By eliminating use of the torque transfer washer (16) as shown in Figure 3, significantly greater secondary wear surface is provided.
At the same time, sufficient torque transfer surface is provided between coupling body 18 and connecting shaft (12).
It is seen in Figure 3 that the edges of the vaned wheel are chamfered to facilitate insertion and extraction of the sucker rod string. Also, at the upper and lower end of each vane, a notch (36) is provided to permit flow of fluid through the lubrication grooves even when vaned wheel abuts coupling bracket (18).
Accordingly, this invention has been described with reference to a preferred embodiment. However, this description is not intended to be limiting in that various modifications and variations will be apparent to persons skilled in the art.
It is contemplated that the appended claims will cover any such modifications or embodiments as fall within the scope of the invention.
The Rockwell Hardness of the resin used in the preferred embodiment is 120 on the R Scale.
The vaned wheel (14) of the preferred embodiment is a further improvement in that it is less prone to rotation within the casing (40) as the sucker rod string rotates in normal operation. In normal use, the wheel (14) rests against the casing (40). The increased resistance to rotation is a result of a wider stance between the two points of contact between the wheel (14) and the casing ( shown as A and B in Figure 4). It is readily seen that the stance A - B is close to 90 degrees of the circumference of the casing (40) whereas in the prior art shown in Figure 2, the stance is approximately 30 degrees.
In the event the vanes (32) of the wheel (14) wear down significantly or the wheel (14) breaks, the outer cylindrical surface (19) of the sucker rod couplings (18a, 18b) act as alternative sacrificial surfaces. As shown in prior art Figure 1, the sacrificial surface consisted only of torque transfer washer (16). By eliminating use of the torque transfer washer (16) as shown in Figure 3, significantly greater secondary wear surface is provided.
At the same time, sufficient torque transfer surface is provided between coupling body 18 and connecting shaft (12).
It is seen in Figure 3 that the edges of the vaned wheel are chamfered to facilitate insertion and extraction of the sucker rod string. Also, at the upper and lower end of each vane, a notch (36) is provided to permit flow of fluid through the lubrication grooves even when vaned wheel abuts coupling bracket (18).
Accordingly, this invention has been described with reference to a preferred embodiment. However, this description is not intended to be limiting in that various modifications and variations will be apparent to persons skilled in the art.
It is contemplated that the appended claims will cover any such modifications or embodiments as fall within the scope of the invention.
Claims (5)
1. A sucker rod guide bearing comprising:
(a) a cylindrical connecting shaft having a threaded stud at each end for connecting to a coupling and a shoulder for receiving and transmitting torque;
(b) a vaned cylindrical wheel slidably mounted over the connecting shaft; and (c) a sucker rod coupling having internal threads at one end for attaching to the threaded stud and internal threads at the other end for connecting to a sucker rod;
wherein the wheel has four vanes, each vane having a substantially semi-circular cross-section outline.
(a) a cylindrical connecting shaft having a threaded stud at each end for connecting to a coupling and a shoulder for receiving and transmitting torque;
(b) a vaned cylindrical wheel slidably mounted over the connecting shaft; and (c) a sucker rod coupling having internal threads at one end for attaching to the threaded stud and internal threads at the other end for connecting to a sucker rod;
wherein the wheel has four vanes, each vane having a substantially semi-circular cross-section outline.
2. The sucker rod guide bearing of claim 1 wherein each vane has an internal lubrication groove running the length of the wheel and wherein the wheel is notched at each end of each groove.
3. The sucker rod guide bearing of claim 2 wherein the wheel and vanes are fashioned from a polyphtalamide resin.
4. The sucker rod guide bearing of claim 2 or 3 wherein the wheel and vanes are fashioned from a material having a Rockwell Hardness of at least about 120 on the R scale.
5. The sucker rod guide bearing of claim 1, 2 or 3 wherein the sucker rod couplings have a substantially flat end surface which contacts the shoulder when the coupling is attached to the connecting shaft and which is thereby able to transmit at least 1.5 times the torque capacity of the sucker rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2225894 CA2225894C (en) | 1997-12-24 | 1997-12-24 | Improved sucker rod guide bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2225894 CA2225894C (en) | 1997-12-24 | 1997-12-24 | Improved sucker rod guide bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2225894A1 CA2225894A1 (en) | 1999-06-24 |
| CA2225894C true CA2225894C (en) | 2007-05-22 |
Family
ID=29408993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2225894 Expired - Fee Related CA2225894C (en) | 1997-12-24 | 1997-12-24 | Improved sucker rod guide bearing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2225894C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337843B (en) * | 2011-10-08 | 2014-07-16 | 杭州佳湖科技有限公司 | Axial translation type automatic centering rotating joint for sucker rod |
| CN107084123B (en) * | 2017-06-27 | 2018-11-13 | 河南福侨石油装备有限公司 | Fixed sand setting chamber Anti-sand oil pump |
| CN110617202B (en) * | 2019-10-12 | 2021-12-07 | 克拉玛依胜利高原机械有限公司 | Bridge type injection and suction sand-proof pump |
-
1997
- 1997-12-24 CA CA 2225894 patent/CA2225894C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2225894A1 (en) | 1999-06-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20161228 |