CA2550066A1 - Improved wellhead drive braking mechanism - Google Patents
Improved wellhead drive braking mechanism Download PDFInfo
- Publication number
- CA2550066A1 CA2550066A1 CA002550066A CA2550066A CA2550066A1 CA 2550066 A1 CA2550066 A1 CA 2550066A1 CA 002550066 A CA002550066 A CA 002550066A CA 2550066 A CA2550066 A CA 2550066A CA 2550066 A1 CA2550066 A1 CA 2550066A1
- Authority
- CA
- Canada
- Prior art keywords
- fluid
- rod string
- pump
- reservoir
- braking mechanism
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract 25
- 238000005381 potential energy Methods 0.000 claims abstract 4
- 238000005086 pumping Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Braking Arrangements (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention provides in one aspect a braking mechanism for slowing the release of torsional potential energy in a rod string of a wellhead drive system on the shutdown or power failure thereof. The braking mechanism, without using a slip clutch, slows the backspin of the rod string by using the rotational energy of the rod string to turn a fluid pump to pump fluid through a constriction orifice in a closed fluid circuit. The present invention reduces the space required for t he braking mechanism and moreover reduces the number of moving parts within the braking mechanism which may reduce the likelihood that the braking mechanism will require maintenance or fail, as well as reduce the manufacturing cost. In another aspect, the present invention provides a wellhead drive system for driving a rotary downhole pump which includes the inventive braking mechanism described above.
Claims (2)
1. For use with a pumping system in which a downhole pump has a rotor which is rotated by a rod string which is in turn rotated by a motor, a braking mechanism for slowing the release of torsional potential energy in the rod string when the motor stops, the mechanism comprising:
a rotary member rotationally coupled to the top end of the rod string;
a reservoir containing a dampening fluid;
a fluid pump driven by the rotary member, interposed into a closed fluid circuit with the reservoir, the fluid circuit comprising:
a one-way valve allowing dampening fluid to flow between the reservoir and the fluid pump in a first direction corresponding to normal operation of the downhole pump, the one-way valve including a valve orifice having a valve orifice area that does not substantially restrict the free flow of the dampening fluid during normal operation of the downhole pump; and a constriction orifice allowing the dampening fluid to flow between the reservoir and the fluid pump in a direction opposite to the first direction, the constriction orifice having an orifice area which substantially restricts the flow of the dampening fluid through the fluid circuit as potential torsional energy is released from the rod string;
whereby if the motor stops the potential torsional energy in the rod string is dissipated by controlled rotation of the rod string in a direction opposite to the first direction.
a rotary member rotationally coupled to the top end of the rod string;
a reservoir containing a dampening fluid;
a fluid pump driven by the rotary member, interposed into a closed fluid circuit with the reservoir, the fluid circuit comprising:
a one-way valve allowing dampening fluid to flow between the reservoir and the fluid pump in a first direction corresponding to normal operation of the downhole pump, the one-way valve including a valve orifice having a valve orifice area that does not substantially restrict the free flow of the dampening fluid during normal operation of the downhole pump; and a constriction orifice allowing the dampening fluid to flow between the reservoir and the fluid pump in a direction opposite to the first direction, the constriction orifice having an orifice area which substantially restricts the flow of the dampening fluid through the fluid circuit as potential torsional energy is released from the rod string;
whereby if the motor stops the potential torsional energy in the rod string is dissipated by controlled rotation of the rod string in a direction opposite to the first direction.
2. A wellhead drive system for driving a downhole pump including a rotor comprising:
a rod string having a top end and a bottom end, the bottom end being connected to, supporting and rotating the rotor;
a motor providing torque energy for rotating the top end, whereby torsional potential energy is stored in the rod string during operation; and a braking mechanism for slowing the release of torsional potential energy in the rod string when the motor stops, the mechanism comprising:
a rotary member rotationally coupled to the top end of the rod string;
a reservoir containing a dampening fluid;
a fluid pump driven by the rotary member, interposed into a closed fluid circuit with the reservoir, the fluid circuit comprising:
a one-way valve allowing dampening fluid to flow between the reservoir and the fluid pump in a first direction corresponding to normal operation of the downhole pump, the one-way valve including a valve orifice having a valve orifice area that does not substantially restrict the free flow of the dampening fluid during normal operation of the downhole pump; and a constriction orifice allowing the dampening fluid to flow between the reservoir and the fluid pump in a direction opposite to the first direction, the constriction orifice having an orifice area which substantially restricts the flow of the dampening fluid through the fluid circuit as potential torsional energy is released from the rod string;
whereby if the motor stops the potential torsional energy in the rod string is dissipated by controlled rotation of the rod string in a direction opposite to the first direction.
a rod string having a top end and a bottom end, the bottom end being connected to, supporting and rotating the rotor;
a motor providing torque energy for rotating the top end, whereby torsional potential energy is stored in the rod string during operation; and a braking mechanism for slowing the release of torsional potential energy in the rod string when the motor stops, the mechanism comprising:
a rotary member rotationally coupled to the top end of the rod string;
a reservoir containing a dampening fluid;
a fluid pump driven by the rotary member, interposed into a closed fluid circuit with the reservoir, the fluid circuit comprising:
a one-way valve allowing dampening fluid to flow between the reservoir and the fluid pump in a first direction corresponding to normal operation of the downhole pump, the one-way valve including a valve orifice having a valve orifice area that does not substantially restrict the free flow of the dampening fluid during normal operation of the downhole pump; and a constriction orifice allowing the dampening fluid to flow between the reservoir and the fluid pump in a direction opposite to the first direction, the constriction orifice having an orifice area which substantially restricts the flow of the dampening fluid through the fluid circuit as potential torsional energy is released from the rod string;
whereby if the motor stops the potential torsional energy in the rod string is dissipated by controlled rotation of the rod string in a direction opposite to the first direction.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2550066A CA2550066C (en) | 2006-06-09 | 2006-06-09 | Improved wellhead drive braking mechanism |
| US11/757,639 US20070292277A1 (en) | 2006-06-09 | 2007-06-04 | Wellhead drive brake system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2550066A CA2550066C (en) | 2006-06-09 | 2006-06-09 | Improved wellhead drive braking mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2550066A1 true CA2550066A1 (en) | 2007-12-09 |
| CA2550066C CA2550066C (en) | 2011-08-09 |
Family
ID=38829285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2550066A Expired - Fee Related CA2550066C (en) | 2006-06-09 | 2006-06-09 | Improved wellhead drive braking mechanism |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20070292277A1 (en) |
| CA (1) | CA2550066C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10968718B2 (en) | 2017-05-18 | 2021-04-06 | Pcm Canada Inc. | Seal housing with flange collar, floating bushing, seal compressor, floating polished rod, and independent fluid injection to stacked dynamic seals, and related apparatuses and methods of use |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0605236A (en) * | 2006-12-06 | 2008-07-22 | Weatherford Ind E Com Ltda | remote braking system |
| BRPI0605759A (en) * | 2006-12-15 | 2008-08-12 | Weatherford Ind E Com Ltda | auxiliary brake for drive heads for progressive cavity pumps |
| US8662186B2 (en) | 2011-03-15 | 2014-03-04 | Weatherford/Lamb, Inc. | Downhole backspin retarder for progressive cavity pump |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475872A (en) * | 1982-09-28 | 1984-10-09 | Robbins & Myers, Inc. | Water pump and gear box therefor |
| US4993276A (en) * | 1987-03-13 | 1991-02-19 | Superior Gear Box Company | Drive assembly with overspeed brake |
| US4797075A (en) * | 1987-04-09 | 1989-01-10 | Hughes Tool Company | Overspeed protective gear box for a well pump |
| JPH0756275B2 (en) * | 1988-01-22 | 1995-06-14 | トヨタ自動車株式会社 | Fluid pump |
| US4997346A (en) * | 1990-04-12 | 1991-03-05 | Atlantic Richfield Company | Well pumping systems |
| DE4033553C2 (en) * | 1990-10-22 | 1994-01-27 | Sportex Gmbh U Co | Fiber-reinforced plastic shaft for a golf club |
| CA2074013A1 (en) * | 1992-07-16 | 1994-01-17 | Robert A. R. Mills | Brake assembly for rotating rod |
| CA2347942C (en) * | 2001-05-22 | 2006-11-21 | Kudu Industries Inc. | Rotary shaft brake |
| CA2455742C (en) * | 2004-01-23 | 2012-01-10 | Kudu Industries Inc. | Rotary drivehead for downhole apparatus |
-
2006
- 2006-06-09 CA CA2550066A patent/CA2550066C/en not_active Expired - Fee Related
-
2007
- 2007-06-04 US US11/757,639 patent/US20070292277A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10968718B2 (en) | 2017-05-18 | 2021-04-06 | Pcm Canada Inc. | Seal housing with flange collar, floating bushing, seal compressor, floating polished rod, and independent fluid injection to stacked dynamic seals, and related apparatuses and methods of use |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2550066C (en) | 2011-08-09 |
| US20070292277A1 (en) | 2007-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20210609 |