US20150300137A1 - Pump Drive Unit for Water, Oil or Other Fluid Extraction - Google Patents
Pump Drive Unit for Water, Oil or Other Fluid Extraction Download PDFInfo
- Publication number
- US20150300137A1 US20150300137A1 US14/670,545 US201514670545A US2015300137A1 US 20150300137 A1 US20150300137 A1 US 20150300137A1 US 201514670545 A US201514670545 A US 201514670545A US 2015300137 A1 US2015300137 A1 US 2015300137A1
- Authority
- US
- United States
- Prior art keywords
- drive unit
- piston
- pumping
- rod
- pump drive
- 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.)
- Abandoned
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 26
- 238000000605 extraction Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 20
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 240000007643 Phytolacca americana Species 0.000 description 2
- 235000009074 Phytolacca americana Nutrition 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000638 stimulation Effects 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
- 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
-
- 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
- E21B43/129—Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole
Definitions
- This invention pertains to a reciprocating up and down movement pump drive unit for water, oil, or other fluid extraction; the pump drive unit uses a pumping rod string that allows pumping fluids from depths of thousands of meters. This unit can be used in any well operated with mechanical pumping, without making any changes to the existing installation, achieving a reduction of around 20% in pumping and operating equipment costs.
- this invention is intended to reduce operating costs, ensure safety, and protect the environment in fluid pumping operations.
- the drive unit is responsible for lifting the rod string and storing pneumatic potential energy, making it possible to work at a very low cycles-per-minute rate, thus allowing complete filling of the pump and a lower dynamic load.
- the pumping action achieved with this invention reduces the structural load on the equipment, extending the useful life of the down-hole installation because the pumping rod string works at constant loads.
- a drive unit with current technology uses a piston that runs along the inside of a vertical cylinder; this piston has its own drive shaft, which must be connected to the rod string on each side of the shaft and that is separate from the rod string, or is inserted in the pipe or set away from the mouth of the well at a distance equivalent to the length of the stroke so that when the piston is at its maximum elevation, the shaft pokes out of the end of the cylinder for a length equivalent to that of the piston stroke.
- the polished rod of the rod string works as piston shaft, resulting in a greatly simplified drive unit that includes a cylinder with an internal piston attached to the polished rod of the rod string, thus removing the shaft that protrudes from the cylinder and increases the size of the drive unit structure and requires more structural support.
- This invention optimizes rod string weight balancing, enabling high sucker rod pulling capacities and a broad range of speed and stroke length variations; its set-up allows independent control of rod string upward and downward speeds, as well as load control.
- Another key feature is the ability to adjust operating parameters such as speed and maximum load, and therefore the well's level of operation, acceleration, inversion point are set while the device is running. Furthermore, using a drive unit like the one described in this report allows one to dispense with the use of variable speed drives.
- the pump drive unit thus becomes much more efficient because it only uses energy to lift the fluid column and operates the well at a constant level, maximizing its yield.
- FIG. 1 is a schematic cross-section of the basic elements of a pump drive unit for water, oil or other fluid extraction, according to this invention
- FIG. 2 offers a side view of the pump drive unit according to the invention, with longitudinal tanks surrounding the central cylinder of the unit and a partial lower cross-section;
- FIG. 3 shows a view of detail “A” from FIG. 2 ;
- FIG. 4 is a cross-section view of the drive unit's polished rod, with a separator on the threaded end.
- FIG. 1 shows a pump drive unit for extracting fluids from a well, with the polished rod of the rod string ( 1 ) actuated alternately by the unit, so as to convey such movement to the fluid pump located deep within the well.
- the drive unit includes a piston ( 2 ) coupled to the polished rod of the rod string ( 1 ); this piston ( 2 ) is actuated by the pressure of fluid coming in through a pipe ( 3 ) so that it will move upward and downward along the length of the stationary vertical hydraulic cylinder ( 4 ).
- the movement of the piston ( 2 ) will pull the rod string ( 1 ) that has been attached to the pumping shaft, thus causing the extraction pump to move up and down.
- Using the polished rod of the rod string ( 1 ) as a piston shaft ( 2 ) allows the height of the drive unit to be the same as that of the unit's maximum stroke length, unlike other currently available hydraulic drive units where the piston shaft is a separate element of the drive unit that pokes out of the top or bottom of the hydraulic cylinder ( 4 ) when the piston ( 2 ) is at its highest elevation.
- FIG. 2 shows a preferred implementation of the drive unit, in which six tanks ( 5 ) filled with a compensation fluid, such as nitrogen, are distributed around the hydraulic cylinder ( 4 ), which helps the piston ( 1 ) movement control system. This enhances the stability of the hydraulic cylinder ( 4 ).
- a compensation fluid such as nitrogen
- FIG. 3 shows a preferred way to attach the rod string's polished rod ( 1 ) to the piston ( 2 ) of the pump drive unit in this invention.
- the fitting includes two flanges, an upper flange ( 6 ) or hydraulic cylinder flange ( 4 ) which is supported on the seat ( 7 a ) of a lower flange ( 7 ) or well-connection flange, fastened with bolls inserted into threaded holes ( 8 ).
- FIG. 3 shows the seal assembly with its body ( 11 ), strung in the rod string's polished rod ( 1 ) and resting on the seat ( 21 ) of the lower flange ( 7 ), which includes: a guide ring ( 12 ) in contact with the piston ( 2 ) and a housing ( 13 ) under the guide ring with a first hydraulic seal, and next to it a guide bushing ( 14 ); under the guide bushing, there is a cavity ( 15 ) that makes up a second stage of the hydraulic seal.
- a third hydraulic seal stage ( 16 ) that can separate hydraulic fluid from extraction fluid, in which there are also wipers ( 22 ), the cleaning elements of the rod string's polished rod ( 1 ), preventing any soil from getting to the remaining elements of the body ( 11 ) of the seal assembly.
- a part ( 17 ) that serves to stop the piston ( 2 ).
- FIG. 4 shows the application where a spacer ( 18 ) is inserted in the rod string's polished rod ( 1 ); the spacer is located on top of the piston ( 2 ) and fastened with a threaded coupling ( 19 ) to the end of the rod siring's polished rod ( 1 ). Therefore, the desired spacing in the pumping unit is achieved by adding separators ( 18 ) between the piston ( 2 ) and the coupling ( 19 ) of the polished rod ( 1 ).
- the hydraulic seals shown in FIGS. 3 and 4 shall preferably be those known in the technical field as “polypack” seals.
- actuating fluids that can be used in this drive unit, they can be any of the fluids that are commonly used in the industry for moving pistons.
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)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A reciprocating seesaw-type (upward-downward) pump drive unit for water, oil, or other fluid extraction; the pump drive unit uses a pumping rod string that allows pumping fluids from depths of thousands of meters. This unit can be used in any well operated with mechanical pumping, without making any changes to the existing installation, achieving a reduction of around 20% in pumping and operating equipment costs. The drive unit includes a piston (2) that slides up and down inside a vertical hydraulic cylinder (4) with the application of an actuating fluid, and where the piston shaft (2) is the rod string's polished rod (1).
Description
- This invention pertains to a reciprocating up and down movement pump drive unit for water, oil, or other fluid extraction; the pump drive unit uses a pumping rod string that allows pumping fluids from depths of thousands of meters. This unit can be used in any well operated with mechanical pumping, without making any changes to the existing installation, achieving a reduction of around 20% in pumping and operating equipment costs.
- In relation to the state of the technology, we know that two thirds of the world's extraction wells are operated through mechanical pumping, and that in Argentina alone, approximately 70% of all oil wells are operated using this technology. The growing demand for energy has created a need to optimize pumping facilities in order to level industry costs with international numbers.
- Therefore, this invention is intended to reduce operating costs, ensure safety, and protect the environment in fluid pumping operations.
- The operational flexibility of the drive unit described in this report is clearly demonstrated at any well that requires mechanical pumping, especially those that need to use pumping units that can provide a broad range of speed variations due to the type of stimulation system involved.
- The drive unit is responsible for lifting the rod string and storing pneumatic potential energy, making it possible to work at a very low cycles-per-minute rate, thus allowing complete filling of the pump and a lower dynamic load.
- The pumping action achieved with this invention reduces the structural load on the equipment, extending the useful life of the down-hole installation because the pumping rod string works at constant loads.
- A drive unit with current technology uses a piston that runs along the inside of a vertical cylinder; this piston has its own drive shaft, which must be connected to the rod string on each side of the shaft and that is separate from the rod string, or is inserted in the pipe or set away from the mouth of the well at a distance equivalent to the length of the stroke so that when the piston is at its maximum elevation, the shaft pokes out of the end of the cylinder for a length equivalent to that of the piston stroke. This produces either a structure that is very long and has little height stability or is complicated to regulate.
- On the other hand, in this invention the polished rod of the rod string works as piston shaft, resulting in a greatly simplified drive unit that includes a cylinder with an internal piston attached to the polished rod of the rod string, thus removing the shaft that protrudes from the cylinder and increases the size of the drive unit structure and requires more structural support.
- This invention optimizes rod string weight balancing, enabling high sucker rod pulling capacities and a broad range of speed and stroke length variations; its set-up allows independent control of rod string upward and downward speeds, as well as load control.
- In addition, there is a significant reduction in weight and volume, facilitating installation and transportation and consequently lowering logistics costs, as the unit can be delivered fully assembled for easy installation that requires only a bull crane. Its size can also be adapted to each individual operation, something that cannot be done with other drive units in the market today.
- Another key feature is the ability to adjust operating parameters such as speed and maximum load, and therefore the well's level of operation, acceleration, inversion point are set while the device is running. Furthermore, using a drive unit like the one described in this report allows one to dispense with the use of variable speed drives.
- The pump drive unit thus becomes much more efficient because it only uses energy to lift the fluid column and operates the well at a constant level, maximizing its yield.
- On the other hand, any risk of fluid spills is eliminated because there is no stuffing box, and in terms of safety or operating risks, there are no exposed moving parts, which eliminates any possibility of personal injury.
- For an easy understanding of this invention, it has been illustrated with figures depicting one of the preferred methods of implementation as a demonstration, where:
-
FIG. 1 is a schematic cross-section of the basic elements of a pump drive unit for water, oil or other fluid extraction, according to this invention; -
FIG. 2 offers a side view of the pump drive unit according to the invention, with longitudinal tanks surrounding the central cylinder of the unit and a partial lower cross-section; -
FIG. 3 shows a view of detail “A” fromFIG. 2 ; -
FIG. 4 is a cross-section view of the drive unit's polished rod, with a separator on the threaded end. - In every figure, the same numbers and letters are used to refer to the same elements of the invention.
-
FIG. 1 shows a pump drive unit for extracting fluids from a well, with the polished rod of the rod string (1) actuated alternately by the unit, so as to convey such movement to the fluid pump located deep within the well. The drive unit includes a piston (2) coupled to the polished rod of the rod string (1); this piston (2) is actuated by the pressure of fluid coming in through a pipe (3) so that it will move upward and downward along the length of the stationary vertical hydraulic cylinder (4). As can be seen here, the movement of the piston (2) will pull the rod string (1) that has been attached to the pumping shaft, thus causing the extraction pump to move up and down. - Using the polished rod of the rod string (1) as a piston shaft (2) allows the height of the drive unit to be the same as that of the unit's maximum stroke length, unlike other currently available hydraulic drive units where the piston shaft is a separate element of the drive unit that pokes out of the top or bottom of the hydraulic cylinder (4) when the piston (2) is at its highest elevation.
-
FIG. 2 shows a preferred implementation of the drive unit, in which six tanks (5) filled with a compensation fluid, such as nitrogen, are distributed around the hydraulic cylinder (4), which helps the piston (1) movement control system. This enhances the stability of the hydraulic cylinder (4). -
FIG. 3 shows a preferred way to attach the rod string's polished rod (1) to the piston (2) of the pump drive unit in this invention. The fitting includes two flanges, an upper flange (6) or hydraulic cylinder flange (4) which is supported on the seat (7 a) of a lower flange (7) or well-connection flange, fastened with bolls inserted into threaded holes (8). - In order to actuate the piston (2), fluid goes into the chamber (9), which will force the piston (2) to go up or down, depending on the pressure in the chamber (9).
-
FIG. 3 shows the seal assembly with its body (11), strung in the rod string's polished rod (1) and resting on the seat (21) of the lower flange (7), which includes: a guide ring (12) in contact with the piston (2) and a housing (13) under the guide ring with a first hydraulic seal, and next to it a guide bushing (14); under the guide bushing, there is a cavity (15) that makes up a second stage of the hydraulic seal. Under the second seal stage, in the body (11) of the seal assembly, there is a third hydraulic seal stage (16) that can separate hydraulic fluid from extraction fluid, in which there are also wipers (22), the cleaning elements of the rod string's polished rod (1), preventing any soil from getting to the remaining elements of the body (11) of the seal assembly. Schematically speaking, at the end of the rod string's polished rod (1) there is a part (17) that serves to stop the piston (2). -
FIG. 4 shows the application where a spacer (18) is inserted in the rod string's polished rod (1); the spacer is located on top of the piston (2) and fastened with a threaded coupling (19) to the end of the rod siring's polished rod (1). Therefore, the desired spacing in the pumping unit is achieved by adding separators (18) between the piston (2) and the coupling (19) of the polished rod (1). The hydraulic seals shown inFIGS. 3 and 4 shall preferably be those known in the technical field as “polypack” seals. - With regard to the possible types of actuating fluids that can be used in this drive unit, they can be any of the fluids that are commonly used in the industry for moving pistons.
Claims (4)
1. Pump drive unit for water, oil or other fluid extraction able of providing a reciprocating motion (upward/downward) to a pumping unit through a pumping rod string (a); the drive unit includes a piston (2) that slides up and down inside a vertical hydraulic cylinder (4) as a result of the application of an actuating fluid, characterized in that the piston shaft (2) is the sucker rod string's polished rod (1).
2. Pump drive unit for water, oil or other fluid extraction in accordance with claim 1 , characterized in that the coupling of the piston (2) to the polished rod (1) of the pumping string (1) includes a lower well connection flange (7) with a seat (7 a) against which rests an upper flange (6) for the hydraulic cylinder (4), and in which said upper flange (7) has a tab (20) to support the hydraulic cylinder (4); located on the lower flange (7) and threaded into the polished rod (1) of the rod string there is a seal assembly.
3. Pump drive unit for water, oil or other fluid extraction in accordance with claim 2 , characterized in that the seal assembly includes a body (11) housing a guide ring on the top (12) in contact with the piston (2); underneath the guide ring there is a housing (13) with a first hydraulic seal, and next to it a guide bushing (14); under the guide bushing (14), there is a cavity (15) that makes up a second stage hydraulic seal; below this second hydraulic seal stage there is a third hydraulic seal stage (16) in the body (11) of the seal assembly that can separate the hydraulic fluid from the extraction fluid in which there are also wipers (22) for the rod string's polished rod (1).
4. Pump drive unit for water, oil or other fluid extraction in accordance with claim 1 , characterized in that at the end of the rod string's polished rod (1) and over the piston (2) there is at least one spacer (18) attached by a coupling (19) threaded to the end of the rod string's polished rod (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AR20140101389 | 2014-03-27 | ||
ARP140101389A AR095913A1 (en) | 2014-03-27 | 2014-03-27 | PUMP DRIVE UNIT FOR WATER, OIL OR OTHER FLUID EXTRACTION |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150300137A1 true US20150300137A1 (en) | 2015-10-22 |
Family
ID=54321586
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/670,545 Abandoned US20150300137A1 (en) | 2014-03-27 | 2015-03-27 | Pump Drive Unit for Water, Oil or Other Fluid Extraction |
Country Status (3)
Country | Link |
---|---|
US (1) | US20150300137A1 (en) |
AR (1) | AR095913A1 (en) |
MX (1) | MX2015004121A (en) |
Citations (32)
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---|---|---|---|---|
US1708584A (en) * | 1925-04-27 | 1929-04-09 | Elmer Joyce | Pumping rig |
US2258103A (en) * | 1938-07-09 | 1941-10-07 | Scheider Frederick Edmund | Well pumping apparatus |
US2366777A (en) * | 1941-03-29 | 1945-01-09 | Ralph C Farley | Hydraulic lifting mechanism |
US2645900A (en) * | 1947-04-05 | 1953-07-21 | Loyd E Hutchison | Hydraulic type fluid transmission |
US2729941A (en) * | 1954-04-30 | 1956-01-10 | Axelson Mfg Company Division O | Fluid actuated pumping jack |
US2852001A (en) * | 1954-11-04 | 1958-09-16 | Horace B Van Valkenburgh | Pump jack |
US3007451A (en) * | 1960-05-03 | 1961-11-07 | Dynaquip | Reversing valve |
US3038310A (en) * | 1960-02-23 | 1962-06-12 | Dynaquip | Combined oil tank and cylinder pedestal for hydraulic pumping unit |
US3395923A (en) * | 1965-07-09 | 1968-08-06 | Phillips Petrocleum Company | Self-lubricating stuffing box |
US3491538A (en) * | 1968-03-04 | 1970-01-27 | Driltrol | Air balanced oil well pumping system |
US4305461A (en) * | 1979-03-15 | 1981-12-15 | Meyer Edward D | Well pumping apparatus |
US4462464A (en) * | 1980-12-08 | 1984-07-31 | Harold D. Brown | Wellhead with hydraulic pump actuator |
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US20010050168A1 (en) * | 2000-06-09 | 2001-12-13 | Oil Lift Technology Inc. | Pump drive head with stuffing box |
US20020014268A1 (en) * | 2000-07-24 | 2002-02-07 | Vann Roy R. | Reciprocating pump standing head valve |
US20030184019A1 (en) * | 2002-04-02 | 2003-10-02 | Rimmer Ian Douglas | Method and apparatus for injecting packing into stuffing boxes for reciprocating rods |
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US20150099838A1 (en) * | 2011-11-08 | 2015-04-09 | Solvay Specialty Polymers Usa, Llc. | High heat resistant polyamide for down hole oil components |
US20150101793A1 (en) * | 2013-10-11 | 2015-04-16 | Daniel Rodolfo Lopez Fidalgo | Drive Unit for Extracting Water, Petroleum or Other Fluids |
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-
2014
- 2014-03-27 AR ARP140101389A patent/AR095913A1/en active IP Right Grant
-
2015
- 2015-03-19 MX MX2015004121A patent/MX2015004121A/en unknown
- 2015-03-27 US US14/670,545 patent/US20150300137A1/en not_active Abandoned
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US3038310A (en) * | 1960-02-23 | 1962-06-12 | Dynaquip | Combined oil tank and cylinder pedestal for hydraulic pumping unit |
US3007451A (en) * | 1960-05-03 | 1961-11-07 | Dynaquip | Reversing valve |
US3395923A (en) * | 1965-07-09 | 1968-08-06 | Phillips Petrocleum Company | Self-lubricating stuffing box |
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US4305461A (en) * | 1979-03-15 | 1981-12-15 | Meyer Edward D | Well pumping apparatus |
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Title |
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Schlumberger Oilfield Glossary, Accessed 3/2017, http://www.glossary.oilfield.slb.com/ * |
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MX2015004121A (en) | 2017-07-07 |
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