CA2237835C - Polished rod clamp - Google Patents
Polished rod clamp Download PDFInfo
- Publication number
- CA2237835C CA2237835C CA002237835A CA2237835A CA2237835C CA 2237835 C CA2237835 C CA 2237835C CA 002237835 A CA002237835 A CA 002237835A CA 2237835 A CA2237835 A CA 2237835A CA 2237835 C CA2237835 C CA 2237835C
- Authority
- CA
- Canada
- Prior art keywords
- liner
- polished rod
- clamp
- section
- head
- 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
- 239000003129 oil well Substances 0.000 claims abstract description 10
- 238000005086 pumping Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002265 prevention Effects 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
- E21B43/127—Adaptations of walking-beam pump systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
- F04B47/026—Pull rods, full rod component parts
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
In an oil well pump, a rod liner is clamped onto a polished rod using an external clamp with an upper clamp section that clamps onto the polished rod, a lower clamp section that clamps onto the liner below the liner head and a yoke section bridging the upper and lower clamp section. In the preferred embodiment, the clamp has a main body extending across the liner head and upper and lower clamping blocks for clamping the rod and the liner respectively to the main body on opposite sides of the liner head.
Description
POLISHED ROD CLAMP
FIELD OF THE INVENTION
The present invention relates to oil well pumps and more particularly to a rod type of pump and a rod liner clamp therefor.
BACKGROUND
In many rod type oil well pumps, the pump is driven by a reciprocating polished rod and the rod is surrounded by a rod liner. The liner has a liner head at its top end, which is fixed to the polished rod by bolts threaded into radial bores in the liner head and acting on the polished rod is set screws.
It is common for the connection between the liner and the polished rod to fail. When it does, oil may be pumped from the top of the liner producing an unacceptable spill. Various solutions have been proposed for capturing oil leaks of this sort or for closing valves included in the system to prevent the leakage.
Another problem that arises is repair of a pump in which the connection of the liner to the polished rod has failed. This may be a difficult and time-consuming task that may involve the disassembly of the liner from the polished rod. The resultant assembly is just as subject to failure as the original.
The present invention is concerned with an apparatus that may serve for the rapid repair of damaged pumps and the prevention of further failure. Where desired, it can be used as an original installation.
SUMMARY
According to one aspect of the present invention there is provided a liner clamp for use in an oil well pumping unit including:
a polished rod;
a polished rod liner surrounding the polished rod;
a liner head secured to an upper end of the liner, the liner clamp comprising:
a yoke for bridging the liner head;
a lower clamp section adapted to be clamped onto the liner adjacent the liner head; and an upper clamp section adapted to be clamped onto the polished rod adjacent the liner head.
According to another aspect of the present invention there is provided a liner clamp as described above in combination with the oil well pumping unit.
The clamp thus clamps onto the polished rod above the liner head and to the liner below the liner head, to hold the liner in place on the polished rod.
In preferred embodiments, the upper and lower clamp sections include respective sections of a main body extending across one side of the liner head and auxiliary upper and lower clamping blocks that extend across the opposite sides of the polished rod and the liner above and below the liner head. These clamping blocks are fastened to the main body to clamp the polished rod and the liner in place.
Grooves in the blocks ensure that the contact surface between the clamps and the polished rod and liner have an area much larger than the clamping area of the prior art bolts and thus provide a more secure connection.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is a side view of a pumping system according to the present invention;
Figure 2 is a side view, partially in section of the prior art liner head clamping system;
Figure 3 is a side view, partly broken away, of a polished rod, liner and clamp assembly according to the present invention; and Figure 4 is an exploded isometric view of a clamp according to the present invention.
DETAILED DESCRIPTION
Referring to the accompanying drawings, and particularly to Figure 1, there is illustrated a conventional oil well pump 10. The pump includes a walking beam 12 oscillated by a drive 14. The walking beam carries a head 16.
Suspended from the head by two cables 20 is a hanger bar 24. A polished rod 26 is clamped to the hanger bar 24 by a polished rod clamp 28. Below the hanger bar 24, a liner surrounds the polished rod 26. The liner has a head 32.
In the prior art arrangement illustrated in Figure 2, the liner head 32 is secured to the polished rod by a set of radial bolts 34 threaded into the liner head and engaging against the surface of the polished rod. The liner and polished rod extend downwardly through a stuffing box 36 of a well head 38.
With the present arrangement, as illustrated in Figures 3 and 4, the liner is fixed to the polished rod by a liner clamp 40. This includes a lower clamp 42 that clamps onto the liner, an upper clamp 44 that clamps onto the polished rod and a yoke joining the upper and lower clamps and bridging the liner head 32.
The liner clamp includes a main body 46 that includes the yoke section of the clamp. This section includes a central recess 48 configured to receive the liner head. Above the yoke section the main body has an upper clamping section 49 with a longitudinal groove 50. Below the yoke section is a lower clamping section with a longitudinal groove 52. The grooves 50 and 52 are part cylindrical in configuration, closely matching the shape of the polished rod and the liner respectively.
There are four bores 54 through the main body, two above the central yoke section and two below.
FIELD OF THE INVENTION
The present invention relates to oil well pumps and more particularly to a rod type of pump and a rod liner clamp therefor.
BACKGROUND
In many rod type oil well pumps, the pump is driven by a reciprocating polished rod and the rod is surrounded by a rod liner. The liner has a liner head at its top end, which is fixed to the polished rod by bolts threaded into radial bores in the liner head and acting on the polished rod is set screws.
It is common for the connection between the liner and the polished rod to fail. When it does, oil may be pumped from the top of the liner producing an unacceptable spill. Various solutions have been proposed for capturing oil leaks of this sort or for closing valves included in the system to prevent the leakage.
Another problem that arises is repair of a pump in which the connection of the liner to the polished rod has failed. This may be a difficult and time-consuming task that may involve the disassembly of the liner from the polished rod. The resultant assembly is just as subject to failure as the original.
The present invention is concerned with an apparatus that may serve for the rapid repair of damaged pumps and the prevention of further failure. Where desired, it can be used as an original installation.
SUMMARY
According to one aspect of the present invention there is provided a liner clamp for use in an oil well pumping unit including:
a polished rod;
a polished rod liner surrounding the polished rod;
a liner head secured to an upper end of the liner, the liner clamp comprising:
a yoke for bridging the liner head;
a lower clamp section adapted to be clamped onto the liner adjacent the liner head; and an upper clamp section adapted to be clamped onto the polished rod adjacent the liner head.
According to another aspect of the present invention there is provided a liner clamp as described above in combination with the oil well pumping unit.
The clamp thus clamps onto the polished rod above the liner head and to the liner below the liner head, to hold the liner in place on the polished rod.
In preferred embodiments, the upper and lower clamp sections include respective sections of a main body extending across one side of the liner head and auxiliary upper and lower clamping blocks that extend across the opposite sides of the polished rod and the liner above and below the liner head. These clamping blocks are fastened to the main body to clamp the polished rod and the liner in place.
Grooves in the blocks ensure that the contact surface between the clamps and the polished rod and liner have an area much larger than the clamping area of the prior art bolts and thus provide a more secure connection.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is a side view of a pumping system according to the present invention;
Figure 2 is a side view, partially in section of the prior art liner head clamping system;
Figure 3 is a side view, partly broken away, of a polished rod, liner and clamp assembly according to the present invention; and Figure 4 is an exploded isometric view of a clamp according to the present invention.
DETAILED DESCRIPTION
Referring to the accompanying drawings, and particularly to Figure 1, there is illustrated a conventional oil well pump 10. The pump includes a walking beam 12 oscillated by a drive 14. The walking beam carries a head 16.
Suspended from the head by two cables 20 is a hanger bar 24. A polished rod 26 is clamped to the hanger bar 24 by a polished rod clamp 28. Below the hanger bar 24, a liner surrounds the polished rod 26. The liner has a head 32.
In the prior art arrangement illustrated in Figure 2, the liner head 32 is secured to the polished rod by a set of radial bolts 34 threaded into the liner head and engaging against the surface of the polished rod. The liner and polished rod extend downwardly through a stuffing box 36 of a well head 38.
With the present arrangement, as illustrated in Figures 3 and 4, the liner is fixed to the polished rod by a liner clamp 40. This includes a lower clamp 42 that clamps onto the liner, an upper clamp 44 that clamps onto the polished rod and a yoke joining the upper and lower clamps and bridging the liner head 32.
The liner clamp includes a main body 46 that includes the yoke section of the clamp. This section includes a central recess 48 configured to receive the liner head. Above the yoke section the main body has an upper clamping section 49 with a longitudinal groove 50. Below the yoke section is a lower clamping section with a longitudinal groove 52. The grooves 50 and 52 are part cylindrical in configuration, closely matching the shape of the polished rod and the liner respectively.
There are four bores 54 through the main body, two above the central yoke section and two below.
To secure the main body of the clamp to the liner, the clamp includes a lower clamping block 56 with a part cylindrical groove 58 and two bores 60 that align with the lower bores 54 in the main body to receive bolts 62 through the aligned bores. Nut 64 tightened on the bolts to clamp the liner between the grooves in the main body and the lower clamping block. Similarly, the upper clamp includes an upper clamping block 66 and a part cylindrical groove 68. Bores 70 on opposite sides of the upper clamping block align with the upper bores 54 in the main body to receive bolts 72. Nuts 74 on the bolts clamp the polished rod between the main body and the upper clamping block above the liner head.
The relatively large clamping surface of the upper and lower clamps ensures a strong connection between the clamp and the polished rod and the rod liner. This significantly reduces the frequency of failures in the coupling of the liner to the polished rod. When used for a repair, the clamp can be installed very quickly with a minimum of downtime.
While one embodiment of the present invention has been described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention and are intended to be included herein. The invention is to be considered limited solely by the scope of the appended claims.
The relatively large clamping surface of the upper and lower clamps ensures a strong connection between the clamp and the polished rod and the rod liner. This significantly reduces the frequency of failures in the coupling of the liner to the polished rod. When used for a repair, the clamp can be installed very quickly with a minimum of downtime.
While one embodiment of the present invention has been described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention and are intended to be included herein. The invention is to be considered limited solely by the scope of the appended claims.
Claims (14)
1. In an oil well pumping unit including:
a polished rod;
a polished rod liner surrounding the polished rod;
a liner head secured to an upper end of the liner, the improvement comprising a liner clamp comprising:
a yoke bridging the liner head;
a lower clamp section clamped onto the liner adjacent the liner head; and an upper clamp section clamped onto the polished rod adjacent the liner head.
a polished rod;
a polished rod liner surrounding the polished rod;
a liner head secured to an upper end of the liner, the improvement comprising a liner clamp comprising:
a yoke bridging the liner head;
a lower clamp section clamped onto the liner adjacent the liner head; and an upper clamp section clamped onto the polished rod adjacent the liner head.
2. The invention according to Claim 1 wherein the liner clamp comprises a main body including the yoke extending across one side of the liner head, the lower clamp section includes a lower section of the main body, and a lower clamping block secured to the lower section of the main body, below the liner head, clamping the liner therebetween.
3. The invention according to Claim 2 wherein the lower clamp section comprises confronting grooves in the lower clamp block and the lower section of the main body for engaging opposite sides of the liner.
4. The invention according to Claim 2 or 3 wherein the upper clamp section comprises an upper section of the main body and an upper clamping block secured to the upper section of the main body above the liner head and clamping the polished rod therebetween.
5. The invention according to Claim 4 wherein the upper clamp section comprises confronting grooves in the upper clamping block and the upper section of the main body for engaging opposite sides of the polished rod.
6. The invention according to any one of Claims 2 through 5 wherein the yoke comprises a section of the main body between the upper and lower sections with a recess therein for receiving the liner head.
7. In an oil well pumping unit including:
a polished rod liner;
a polished rod surrounded by the polished rod liner and projecting from an upper end of the polished rod liner;
a liner head secured to an upper end of the liner and surrounding the polished rod, with the polished rod projecting from the upper end of the liner head, the improvement comprising a liner clamp comprising:
a lower clamp section secured to the liner below the liner head;
an upper clamp section secured to the polished rod above the liner head; and a yoke bridging the liner head and secured to the upper and lower clamp sections thereby fixing the liner to the polished rod.
a polished rod liner;
a polished rod surrounded by the polished rod liner and projecting from an upper end of the polished rod liner;
a liner head secured to an upper end of the liner and surrounding the polished rod, with the polished rod projecting from the upper end of the liner head, the improvement comprising a liner clamp comprising:
a lower clamp section secured to the liner below the liner head;
an upper clamp section secured to the polished rod above the liner head; and a yoke bridging the liner head and secured to the upper and lower clamp sections thereby fixing the liner to the polished rod.
8. A liner clamp for use in an oil well pumping unit including:
a polished rod;
a polished rod liner surrounding the polished rod;
a liner head secured to an upper end of the liner, the liner clamp comprising:
a yoke for bridging the liner head;
a lower clamp section adapted to be clamped onto the liner adjacent the liner head; and an upper clamp section adapted to be clamped onto the polished rod adjacent the liner head.
a polished rod;
a polished rod liner surrounding the polished rod;
a liner head secured to an upper end of the liner, the liner clamp comprising:
a yoke for bridging the liner head;
a lower clamp section adapted to be clamped onto the liner adjacent the liner head; and an upper clamp section adapted to be clamped onto the polished rod adjacent the liner head.
9. A liner clamp according to Claim 8 wherein the yoke comprises a section of a main body extending across one side of the liner head, and the lower clamp section includes a lower section of the main body and a lower clamping block adapted to be secured to the lower section of the main body, below the liner head, clamping the liner therebetween.
10. A liner clamp according to Claim 9 wherein the lower clamp section comprises confronting grooves in the lower clamp block and the lower section of the main body for engaging opposite sides of the liner.
11. A liner clamp according to Claim 9 or 10 wherein the upper clamp section comprises an upper section of the main body and an upper clamping block adapted to be secured to the upper section of the main body above the liner head for clamping the polished rod therebetween.
12. A liner clamp according to Claim 11 wherein the upper clamp section comprises confronting grooves in the upper clamping block and the upper section of the main body for engaging opposite sides of the polished rod.
13. A liner clamp according to any one of Claims 9 through 12 wherein the yoke comprises a section of the main body between the upper and lower sections with a recess therein for receiving the liner head.
14. A liner clamp for use in an oil well pumping unit including:
a polished rod liner;
a polished rod surrounded by the polished rod liner and projecting from an upper end of the polished rod liner;
a liner head secured to an upper end of the liner and surrounding the polished rod, with the polished rod projecting from the upper end of the liner head, the liner clamp comprising:
a lower clamp section adapted to be secured to the liner below the liner head;
an upper clamp section adapted to be secured to the polished rod above the liner head; and a yoke secured to the upper and lower clamp sections for bridging the liner head and thereby fixing the liner to the polished rod.
a polished rod liner;
a polished rod surrounded by the polished rod liner and projecting from an upper end of the polished rod liner;
a liner head secured to an upper end of the liner and surrounding the polished rod, with the polished rod projecting from the upper end of the liner head, the liner clamp comprising:
a lower clamp section adapted to be secured to the liner below the liner head;
an upper clamp section adapted to be secured to the polished rod above the liner head; and a yoke secured to the upper and lower clamp sections for bridging the liner head and thereby fixing the liner to the polished rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002237835A CA2237835C (en) | 1998-05-19 | 1998-05-19 | Polished rod clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002237835A CA2237835C (en) | 1998-05-19 | 1998-05-19 | Polished rod clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2237835A1 CA2237835A1 (en) | 1999-11-19 |
| CA2237835C true CA2237835C (en) | 2001-12-11 |
Family
ID=4162444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002237835A Expired - Fee Related CA2237835C (en) | 1998-05-19 | 1998-05-19 | Polished rod clamp |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2237835C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10907454B2 (en) | 2019-04-23 | 2021-02-02 | Weatherford Technology Holdings, Llc | Polished rod liner assembly |
-
1998
- 1998-05-19 CA CA002237835A patent/CA2237835C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2237835A1 (en) | 1999-11-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |