CA2747117C - Arrangement for hydrocarbon extraction in wells using progressive cavity pumps - Google Patents
Arrangement for hydrocarbon extraction in wells using progressive cavity pumps Download PDFInfo
- Publication number
- CA2747117C CA2747117C CA2747117A CA2747117A CA2747117C CA 2747117 C CA2747117 C CA 2747117C CA 2747117 A CA2747117 A CA 2747117A CA 2747117 A CA2747117 A CA 2747117A CA 2747117 C CA2747117 C CA 2747117C
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- tube
- rotatable
- rotatable tube
- assembly
- fixed
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- 230000000750 progressive effect Effects 0.000 title claims abstract description 21
- 239000004215 Carbon black (E152) Substances 0.000 title abstract description 10
- 238000000605 extraction Methods 0.000 title abstract description 10
- 229930195733 hydrocarbon Natural products 0.000 title abstract description 10
- 150000002430 hydrocarbons Chemical class 0.000 title abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 239000000314 lubricant Substances 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 239000002519 antifouling agent Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 208000014797 chronic intestinal pseudoobstruction Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 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
-
- 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
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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)
- Lubricants (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Jet Pumps And Other Pumps (AREA)
- Joints Allowing Movement (AREA)
Abstract
Arrangement for hydrocarbon extraction in wells using progressive cavity pumps which consists of a rotating tube located inside a fixed tube which extend along the well casing. The rotating tube carries fluid from the bottom of the well to the surface. Between the rotating tube and the fixed tube there is an "O" ring space into which an anti-friction lubricant is injected between the external face of the rotating tube and the internal face of the fixed tube. The bottom end of the rotating tube has a section holding holes through which fluid flows into it, it is connected to the progressive cavity pump by means of a rod, and its top end is connected to a production outlet and to its propelling motor mechanism. The upper section of the fixed tube is connected to an anti- friction lubricant injection pipe in the space between the rotating and the fixed tubes.
Description
Y.\CM001\4361 CA\CIPO\Rplcmt Desc 181105.wpd ARRANGEMENT FOR HYDROCARBON EXTRACTION IN WELLS
USING PROGRESSIVE CAVITY PUMPS
FIELD OF THE INVENTION
This invention refers to an arrangement for hydrocarbon extraction in wells using progressive cavity pumps, and more in particular it relates to an oil extraction tubing arrangement developed in order to reduce its wearing out as a result of friction and corrosion in field wells in which progressive cavity pumps or "PCP" are used.
PRIOR ART AND ADVANTAGES OF THE INVENTION
Within prior art as to this matter, it is worth mentioning that usually in hydrocarbon extraction field wells, power transmission from the surface engine to the bottom pumps "progressive cavity pumps" type, or PCP, is carried out by means of one or more metal rods or bars which rotate inside the metal tubing. As the production well depth may be of several hundred meters or over one thousand meters, it is impossible to avoid certain contact and friction between the tubing and the rods rotating inside it.
The progressive cavity pump uses the oil which it pumps from the bottom of the well as a lubricant between the surfaces which suffer this friction, i.e. between the internal face of the tubing and the external face of the rods which rotate along its inside.
One of the disadvantages arising from the friction between the bottom pump driving rods and the tubing appears as oil fields grow old, as the secondary recovery process increases the percentage of water in the "water-oil" mixture reaching amounts over 95%, bringing about poor lubrication and, in many cases, a combined situation of tubing wearing out due to friction and corrosion. As a consequence of the reiterated friction between rods and tubing the protective boundary layer breaks up -this layer is formed by the building up of a thin deposit of the hydrocarbon present in water and/or by the artificial injection of certain film coating product used as non-corrosive, should this latter method be used-causing tubing corrosion and wearing out. Therefore, it is extremely important to solve this serious problem as it causes considerable economic losses, clearly enough, as exploitation processes at oil fields must be interrupted until tubings are repaired or replaced.
With the aim of solving the above mentioned problems, the arrangement subject matter of this invention has been developed, it allows to considerably reduce the tubings' "wearing out-corrosion-wearing out" combined problem, as it shall be explained below in the "how to put it into practice" proposal.
SUMMARY OF THE INVENTION
The purpose of this invention is to provide an arrangement for hydrocarbon extraction in wells using progressive cavity pumps, this arrangement was developed with the aim of reducing wearing out as a result of friction and corrosion in conventional tubings used in field wells in which the extraction of fluids is carried out by means of progressive cavity pumps. This arrangement consists of a rotating tube located inside a fixed tube placed along the well casing. The rotating tube carries the fluid from the bottom of the well to the surface. Between the rotating tube and the fixed tube there is an "0" ring-type space into which an anti-friction lubricant is injected between the external face of the rotating tube and the internal face of the fixed tube.
The bottom end of the rotating tube has a section with holes which allow fluids to flow into it and it is connected to the progressive cavity pump by means of a rod, its top end is connected to a production outlet and to its propelling motor mechanism. The upper section of the fixed tube is connected to an anti-friction lubricant injection pipe in the space left between the rotating tube and the fixed tube.
In one aspect, the present invention provides an assembly for use with an oil field well having a well head, a well casing, a production zone within the well, a production outlet at the well head and a propelling motor mechanism at the well head; the well casing extending between the well head and a progressive cavity pump located in the production zone, the progressive cavity pump having a stator and a rotor, the assembly
USING PROGRESSIVE CAVITY PUMPS
FIELD OF THE INVENTION
This invention refers to an arrangement for hydrocarbon extraction in wells using progressive cavity pumps, and more in particular it relates to an oil extraction tubing arrangement developed in order to reduce its wearing out as a result of friction and corrosion in field wells in which progressive cavity pumps or "PCP" are used.
PRIOR ART AND ADVANTAGES OF THE INVENTION
Within prior art as to this matter, it is worth mentioning that usually in hydrocarbon extraction field wells, power transmission from the surface engine to the bottom pumps "progressive cavity pumps" type, or PCP, is carried out by means of one or more metal rods or bars which rotate inside the metal tubing. As the production well depth may be of several hundred meters or over one thousand meters, it is impossible to avoid certain contact and friction between the tubing and the rods rotating inside it.
The progressive cavity pump uses the oil which it pumps from the bottom of the well as a lubricant between the surfaces which suffer this friction, i.e. between the internal face of the tubing and the external face of the rods which rotate along its inside.
One of the disadvantages arising from the friction between the bottom pump driving rods and the tubing appears as oil fields grow old, as the secondary recovery process increases the percentage of water in the "water-oil" mixture reaching amounts over 95%, bringing about poor lubrication and, in many cases, a combined situation of tubing wearing out due to friction and corrosion. As a consequence of the reiterated friction between rods and tubing the protective boundary layer breaks up -this layer is formed by the building up of a thin deposit of the hydrocarbon present in water and/or by the artificial injection of certain film coating product used as non-corrosive, should this latter method be used-causing tubing corrosion and wearing out. Therefore, it is extremely important to solve this serious problem as it causes considerable economic losses, clearly enough, as exploitation processes at oil fields must be interrupted until tubings are repaired or replaced.
With the aim of solving the above mentioned problems, the arrangement subject matter of this invention has been developed, it allows to considerably reduce the tubings' "wearing out-corrosion-wearing out" combined problem, as it shall be explained below in the "how to put it into practice" proposal.
SUMMARY OF THE INVENTION
The purpose of this invention is to provide an arrangement for hydrocarbon extraction in wells using progressive cavity pumps, this arrangement was developed with the aim of reducing wearing out as a result of friction and corrosion in conventional tubings used in field wells in which the extraction of fluids is carried out by means of progressive cavity pumps. This arrangement consists of a rotating tube located inside a fixed tube placed along the well casing. The rotating tube carries the fluid from the bottom of the well to the surface. Between the rotating tube and the fixed tube there is an "0" ring-type space into which an anti-friction lubricant is injected between the external face of the rotating tube and the internal face of the fixed tube.
The bottom end of the rotating tube has a section with holes which allow fluids to flow into it and it is connected to the progressive cavity pump by means of a rod, its top end is connected to a production outlet and to its propelling motor mechanism. The upper section of the fixed tube is connected to an anti-friction lubricant injection pipe in the space left between the rotating tube and the fixed tube.
In one aspect, the present invention provides an assembly for use with an oil field well having a well head, a well casing, a production zone within the well, a production outlet at the well head and a propelling motor mechanism at the well head; the well casing extending between the well head and a progressive cavity pump located in the production zone, the progressive cavity pump having a stator and a rotor, the assembly
2 including: a fixed tube having an inner wall, the fixed tube disposed within the well casing and extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and the fixed tube fixed relative to the well casing;
a rotatable tube having an outer wall, a bottom end and a top end, the rotatable tube:
disposed within the fixed tube, defining a rotatable tube fluid conduit extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and rotatable relative to the fixed tube; the fixed tube inner wall and the rotatable tube outer wall defining an anti-friction lubricant container; the fixed tube having an anti-friction lubricant injection inlet in the vicinity of the well head for receiving anti-friction lubricant into the anti-friction lubricant container; the rotatable tube bottom end having:
rotatable tube bottom end holes in fluid communication with the rotatable tube fluid conduit for receiving fluid from the production zone; and connecting pump-drive means for connecting the rotatable tube bottom end to the rotor; the rotatable tube top end having, in the vicinity of the well head: connecting fluid means for fluid communication between the rotatable tube fluid conduit and the production outlet; and connecting rotatable-tube-drive means for drivably connecting the rotatable tube to the propelling motor mechanism; wherein, in use, the rotatable tube is rotated by the propelling motor mechanism which in turn rotates the rotor, causing fluid from the production zone to flow into the rotatable tube fluid conduit via the rotatable tube bottom end holes and thence to the production outlet.
The connecting fluid means may include a swivel to accommodate rotation of the rotatable tube and the connecting rotatable-tube-drive means may be located between the swivel and the rotatable tube bottom end.
The rotatable tube may include a series of interconnected sections attached one to another by threaded joints.
The rotatable tube fluid conduit may include a conduit wall having a protective paint coating.
a rotatable tube having an outer wall, a bottom end and a top end, the rotatable tube:
disposed within the fixed tube, defining a rotatable tube fluid conduit extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and rotatable relative to the fixed tube; the fixed tube inner wall and the rotatable tube outer wall defining an anti-friction lubricant container; the fixed tube having an anti-friction lubricant injection inlet in the vicinity of the well head for receiving anti-friction lubricant into the anti-friction lubricant container; the rotatable tube bottom end having:
rotatable tube bottom end holes in fluid communication with the rotatable tube fluid conduit for receiving fluid from the production zone; and connecting pump-drive means for connecting the rotatable tube bottom end to the rotor; the rotatable tube top end having, in the vicinity of the well head: connecting fluid means for fluid communication between the rotatable tube fluid conduit and the production outlet; and connecting rotatable-tube-drive means for drivably connecting the rotatable tube to the propelling motor mechanism; wherein, in use, the rotatable tube is rotated by the propelling motor mechanism which in turn rotates the rotor, causing fluid from the production zone to flow into the rotatable tube fluid conduit via the rotatable tube bottom end holes and thence to the production outlet.
The connecting fluid means may include a swivel to accommodate rotation of the rotatable tube and the connecting rotatable-tube-drive means may be located between the swivel and the rotatable tube bottom end.
The rotatable tube may include a series of interconnected sections attached one to another by threaded joints.
The rotatable tube fluid conduit may include a conduit wall having a protective paint coating.
3 The rotatable tube may include 2 3/8-inch API standard pipe and the fixed tube may include 2 7/8-inch API standard pipe.
The rotatable tube may have an 1.88-inch external diameter and the fixed tube may have a 2 3/8-inch internal diameter.
In use, an anti-friction lubricant injection inlet having a viscosity of SAE
10 may be injected in the anti-friction lubricant injection inlet.
The connecting pump-drive means may include a rod interposed between and interconnecting the rotatable tube bottom end and the rotor.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding and clarity of the purpose of this invention, it has been illustrated in several drawings which represent it according to the preferred ways in which to carry it out, all of them should be taken as examples, that is:
Figure 1 outlines a typical example of a conventional arrangement for hydrocarbon extraction in wells using progressive cavity pumps.
Figure 2 outlines the arrangement for hydrocarbon extraction in wells using progressive cavity pumps, subject matter of this invention.
Figures 3 to 6 respectively show the blown up details A, B, C and D of the arrangement shown in Figure 2.
It is worth mentioning that in Figure 1, corresponding to the prior art, and in the following figures in which this invention is illustrated the same or equivalent parts are indicated with the same reference numbers in both cases.
The rotatable tube may have an 1.88-inch external diameter and the fixed tube may have a 2 3/8-inch internal diameter.
In use, an anti-friction lubricant injection inlet having a viscosity of SAE
10 may be injected in the anti-friction lubricant injection inlet.
The connecting pump-drive means may include a rod interposed between and interconnecting the rotatable tube bottom end and the rotor.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding and clarity of the purpose of this invention, it has been illustrated in several drawings which represent it according to the preferred ways in which to carry it out, all of them should be taken as examples, that is:
Figure 1 outlines a typical example of a conventional arrangement for hydrocarbon extraction in wells using progressive cavity pumps.
Figure 2 outlines the arrangement for hydrocarbon extraction in wells using progressive cavity pumps, subject matter of this invention.
Figures 3 to 6 respectively show the blown up details A, B, C and D of the arrangement shown in Figure 2.
It is worth mentioning that in Figure 1, corresponding to the prior art, and in the following figures in which this invention is illustrated the same or equivalent parts are indicated with the same reference numbers in both cases.
4 DETAILED DESCRIPTION
Figure 1 shows that the illustrated example of a conventional pumping arrangement consists of a casing 1, with a wellhead outlet 2, which holds inside a tubing 3, which carries the fluid from the bottom of the well to the surface, formed by a succession of sections 4 connected among them by joints 5. Between the casing 1 and the tubing 3 there is a longitudinally defined "0" ring-type space 13. The upper section 4 of the tubing 3 which projects itself from the wellhead at the field's land T surface has a production outlet 6, through which the first of a succession of rods 8 connected among them by joints 9 passes as well as through a stuffing box 7, the last rod 8 at the tubing's lower section 4 is connected to a bottom PCP pump 10. In order to drive the rotating movement of the group of rods 8, and consequently to drive the pump 10, the upper rod 8 is connected to an electric engine 11 by means of a belt-and-pulley transmission mechanism 12.
As it has already been stated, the pump 10 uses the oil which it pumps from the bottom of the well as a lubricant between the surfaces subject to friction, i.e. between the internal face of the tubing 3 and the external face of the rods 8 which rotate along its inside. As oil fields grow old the percentage of water present in the "water-oil" mixture increases, thus lubrication becomes poor causing the tubing's wearing out as a result of friction and corrosion until the protective boundary layer, formed as a consequence of the building up of a thin deposit of the hydrocarbon present in water, breaks up.
In Figure 2 the way in which this invention solves the problem of the wearing out of the pumping rods due to friction and their resulting corrosion is shown. As a matter of fact, the herein proposed arrangement, aimed at solving such problems, consists of a rotating tube 14 located inside a fixed tube 15, between which a space is left which serves as a lubricant oil container, as it can be seen in figure 3, detailed under reference A in this figure 2. For the injection of the lubricant oil, the top end of the fixed tube 15 is connected to a pipe 22 which can be accessed from land T surface.
Figure 1 shows that the illustrated example of a conventional pumping arrangement consists of a casing 1, with a wellhead outlet 2, which holds inside a tubing 3, which carries the fluid from the bottom of the well to the surface, formed by a succession of sections 4 connected among them by joints 5. Between the casing 1 and the tubing 3 there is a longitudinally defined "0" ring-type space 13. The upper section 4 of the tubing 3 which projects itself from the wellhead at the field's land T surface has a production outlet 6, through which the first of a succession of rods 8 connected among them by joints 9 passes as well as through a stuffing box 7, the last rod 8 at the tubing's lower section 4 is connected to a bottom PCP pump 10. In order to drive the rotating movement of the group of rods 8, and consequently to drive the pump 10, the upper rod 8 is connected to an electric engine 11 by means of a belt-and-pulley transmission mechanism 12.
As it has already been stated, the pump 10 uses the oil which it pumps from the bottom of the well as a lubricant between the surfaces subject to friction, i.e. between the internal face of the tubing 3 and the external face of the rods 8 which rotate along its inside. As oil fields grow old the percentage of water present in the "water-oil" mixture increases, thus lubrication becomes poor causing the tubing's wearing out as a result of friction and corrosion until the protective boundary layer, formed as a consequence of the building up of a thin deposit of the hydrocarbon present in water, breaks up.
In Figure 2 the way in which this invention solves the problem of the wearing out of the pumping rods due to friction and their resulting corrosion is shown. As a matter of fact, the herein proposed arrangement, aimed at solving such problems, consists of a rotating tube 14 located inside a fixed tube 15, between which a space is left which serves as a lubricant oil container, as it can be seen in figure 3, detailed under reference A in this figure 2. For the injection of the lubricant oil, the top end of the fixed tube 15 is connected to a pipe 22 which can be accessed from land T surface.
5 In the preferred way of carrying it out which is described and drawn, tubing 14 has a 2 3/8-inch section and tubing 15 has a 2 7/8-inch section, which is enough to achieve the necessary lubrication in order to avoid the wearing out of tube 14 as a result of friction with tube 15. That is to say, the invention comprises a casing with the necessary length to transform the well into a giant bearing which shall operate protected by the layer of lubricant oil which is injected from the outside. In this way, the tubing's internal wearing out, as a result of rods' friction, and the accelerated tubing's corrosion, as it occurs in conventional arrangements, are avoided.
Tube 15 is made up of a succession of sections connected by means of joints 5, as shown in figure 4 corresponding to detail B in figure 2. Tube 14 is made up of a succession of sections connected by means of joints 16, as shown in figure 5 corresponding to detail C pointed out in figure 2.
The upper section of tube 14 has a diameter reduction 17 from where it is connected to a pipe 18 with an articulated joint or "swivel" which ends at the production outlet 6. The lower section of tube 14 shows an end defined by an end tube 19 with holes 30 through which the fluid extracted by the pump 10 flows, said pump is connected to such lower section of tube 14 by means of a rod 20. In figure 6 tube 19 is enlarged and is indicated in figure 2 under reference D, where its holes 30 can be clearly seen.
Tube 14 transmits output power and carries 100% of the fluid extracted from the bottom of the well to the surface along its inside. The oil film 21 between both tubes 14 and 15 (see figure detail) prevents tube 15 internal corrosion and tube 14 external corrosion. In addition, a paint coating on the internal face of tube 14, which carries the fluid, contributes to prevent internal corrosion caused by it. The only modification on tube 14 consists in the structure of the threaded joint 16, by adapting the connecting nipple (see detail C in figure 5) which allows to link both tubes without modifying their external diameter.
Tube 15 is made up of a succession of sections connected by means of joints 5, as shown in figure 4 corresponding to detail B in figure 2. Tube 14 is made up of a succession of sections connected by means of joints 16, as shown in figure 5 corresponding to detail C pointed out in figure 2.
The upper section of tube 14 has a diameter reduction 17 from where it is connected to a pipe 18 with an articulated joint or "swivel" which ends at the production outlet 6. The lower section of tube 14 shows an end defined by an end tube 19 with holes 30 through which the fluid extracted by the pump 10 flows, said pump is connected to such lower section of tube 14 by means of a rod 20. In figure 6 tube 19 is enlarged and is indicated in figure 2 under reference D, where its holes 30 can be clearly seen.
Tube 14 transmits output power and carries 100% of the fluid extracted from the bottom of the well to the surface along its inside. The oil film 21 between both tubes 14 and 15 (see figure detail) prevents tube 15 internal corrosion and tube 14 external corrosion. In addition, a paint coating on the internal face of tube 14, which carries the fluid, contributes to prevent internal corrosion caused by it. The only modification on tube 14 consists in the structure of the threaded joint 16, by adapting the connecting nipple (see detail C in figure 5) which allows to link both tubes without modifying their external diameter.
6 In summary, the arrangement, subject matter of this invention, basically consists of the use of two tubes, 14 and 15, API standard manufacturing, of 2 3/8-inch and 2
7/8-inch respectively, which jointly form a "hydraulic bearing" from the surface to the bottom of the well, which can be lubricated by filling the ''0" ring space between both tubes with clean oil and with the desired viscosity, for example SAE 10. This lubricant prevents corrosion and attenuates the wearing out between both tubes 14 and 15. This arrangement also allows the flowing of all the fluid produced along the inside of tube 14 with no internal moving parts, thus allowing the application of a paint coating in its inside in order to avoid internal corrosion. Also, a similar arrangement could be arranged with tubes holding different diameters, for example 1.42-inch internal diameter, 1.88-inch external diameter within a 2 3/8-inch internal diameter tube, or in other diameters, obtaining the same and before mentioned "hydraulic bearing" effect.
In this way important advantages are achieved as compared to already known and used arrangements, such as:
- By increasing the contact area between the two frictioning surfaces, contact pressure decreases. This contact pressure causes wearing out, thus having less contact pressure results in less wearing out ("hydraulic bearing" effect).
- It allows to reduce the number of revolutions per minute of the rotating tube 14 which transmits power, as it bears higher torsion for holding a bigger diameter than the rods in conventional arrangements, giving it a greater moment of inertia, thus allowing a reduction in the number of friction cycles originated by the rotation frequency for the same power applied, since by transmitting higher torque it is able to rotate at a slower speed resulting in a lower number of wear-out cycles.
- It allows to add an artificial lubricant, chosen by the user, between both frictioning surfaces, i.e. between tubes 14 and 15.
- It allows to do without rods inside the tube which carries production towards the surface, thus being able to apply paint to prevent corrosion on its internal face.
In this way important advantages are achieved as compared to already known and used arrangements, such as:
- By increasing the contact area between the two frictioning surfaces, contact pressure decreases. This contact pressure causes wearing out, thus having less contact pressure results in less wearing out ("hydraulic bearing" effect).
- It allows to reduce the number of revolutions per minute of the rotating tube 14 which transmits power, as it bears higher torsion for holding a bigger diameter than the rods in conventional arrangements, giving it a greater moment of inertia, thus allowing a reduction in the number of friction cycles originated by the rotation frequency for the same power applied, since by transmitting higher torque it is able to rotate at a slower speed resulting in a lower number of wear-out cycles.
- It allows to add an artificial lubricant, chosen by the user, between both frictioning surfaces, i.e. between tubes 14 and 15.
- It allows to do without rods inside the tube which carries production towards the surface, thus being able to apply paint to prevent corrosion on its internal face.
8
Claims (8)
1. An assembly for use with an oil field well having a well head, a well casing, a production zone within the well, a production outlet at the well head and a propelling motor mechanism at the well head; the well casing extending between the well head and a progressive cavity pump located in the production zone, the progressive cavity pump having a stator and a rotor, the assembly comprising:
a fixed tube having an inner wall, the fixed tube disposed within the well casing and extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and the fixed tube fixed relative to the well casing;
a rotatable tube having an outer wall, a bottom end and a top end, the rotatable tube: disposed within the fixed tube, defining a rotatable tube fluid conduit extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and rotatable relative to the fixed tube;
the fixed tube inner wall and the rotatable tube outer wall defining an anti-friction lubricant container;
the fixed tube having an anti-friction lubricant injection inlet in the vicinity of the well head for receiving anti-friction lubricant into the anti-friction lubricant container;
the rotatable tube bottom end having:
rotatable tube bottom end holes in fluid communication with the rotatable tube fluid conduit for receiving fluid from the production zone; and connecting pump-drive means for connecting the rotatable tube bottom end to the rotor;
the rotatable tube top end having, in the vicinity of the well head:
connecting fluid means for fluid communication between the rotatable tube fluid conduit and the production outlet; and connecting rotatable-tube-drive means for drivably connecting the rotatable tube to the propelling motor mechanism;
wherein, in use, the rotatable tube is rotated by the propelling motor mechanism which in turn rotates the rotor, causing fluid from the production zone to flow into the rotatable tube fluid conduit via the rotatable tube bottom end holes and thence to the production outlet.
a fixed tube having an inner wall, the fixed tube disposed within the well casing and extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and the fixed tube fixed relative to the well casing;
a rotatable tube having an outer wall, a bottom end and a top end, the rotatable tube: disposed within the fixed tube, defining a rotatable tube fluid conduit extending between the vicinity of the well head and the vicinity of the progressive cavity pump, and rotatable relative to the fixed tube;
the fixed tube inner wall and the rotatable tube outer wall defining an anti-friction lubricant container;
the fixed tube having an anti-friction lubricant injection inlet in the vicinity of the well head for receiving anti-friction lubricant into the anti-friction lubricant container;
the rotatable tube bottom end having:
rotatable tube bottom end holes in fluid communication with the rotatable tube fluid conduit for receiving fluid from the production zone; and connecting pump-drive means for connecting the rotatable tube bottom end to the rotor;
the rotatable tube top end having, in the vicinity of the well head:
connecting fluid means for fluid communication between the rotatable tube fluid conduit and the production outlet; and connecting rotatable-tube-drive means for drivably connecting the rotatable tube to the propelling motor mechanism;
wherein, in use, the rotatable tube is rotated by the propelling motor mechanism which in turn rotates the rotor, causing fluid from the production zone to flow into the rotatable tube fluid conduit via the rotatable tube bottom end holes and thence to the production outlet.
2. The assembly of claim 1, wherein the connecting fluid means comprises a swivel to accommodate rotation of the rotatable tube and the connecting rotatable-tube-drive means is located between the swivel and the rotatable tube bottom end.
3. The assembly of claim 1 or 2, wherein the rotatable tube comprises a series of interconnected sections attached one to another by threaded joints.
4. The assembly of claim 1, 2 or 3, wherein the rotatable tube fluid conduit comprises a conduit wall having a protective paint coating.
5. The assembly of any one of claims 1 to 4, wherein the rotatable tube comprises 2 3/8-inch API standard pipe and the fixed tube comprises 2 7/8-inch API
standard pipe.
standard pipe.
6. The assembly of any one of claims 1 to 4, wherein the rotatable tube has an 1.88-inch external diameter and the fixed tube has a 2 3/8-inch internal diameter.
7. The assembly of any one of claims 1 to 6, wherein in use, an anti-friction lubricant injection inlet having a viscosity of SAE 10 is injected in the anti-friction lubricant injection inlet.
8. The assembly of any one of claims 1 to 7, wherein the connecting pump-drive means comprises a rod interposed between and interconnecting the rotatable tube bottom end and the rotor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ARP100102791A AR077348A1 (en) | 2010-07-30 | 2010-07-30 | PROVISION FOR THE EXTRACTION OF HYDROCARBONS IN WELLS THAT USE PROGRESSIVE CAVITY PUMPS. |
| ARP20100102791 | 2010-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2747117A1 CA2747117A1 (en) | 2012-01-30 |
| CA2747117C true CA2747117C (en) | 2019-07-02 |
Family
ID=44581746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2747117A Active CA2747117C (en) | 2010-07-30 | 2011-07-22 | Arrangement for hydrocarbon extraction in wells using progressive cavity pumps |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20120034120A1 (en) |
| AR (1) | AR077348A1 (en) |
| BR (1) | BRPI1103813B1 (en) |
| CA (1) | CA2747117C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CO6980133A1 (en) * | 2012-12-26 | 2014-06-27 | Serinpet Ltda Representaciones Y Servicios De Petróleos | Artificial lifting system with progressive cavity motor in the background for hydrocarbon extraction |
| DE202019104979U1 (en) | 2019-09-10 | 2019-11-19 | Netzsch Pumpen & Systeme Gmbh | System for pumping viscous or partially viscous media from a borehole to the earth's surface |
| CN115234197B (en) * | 2021-04-23 | 2023-07-25 | 中国石油天然气股份有限公司 | Rope hanger |
| CN113392483B (en) * | 2021-08-16 | 2021-10-19 | 中国石油集团川庆钻探工程有限公司 | Method and device for determining friction coefficient of shaft and method and device for determining friction resistance of shaft |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2456227A (en) * | 1945-09-25 | 1948-12-14 | Fmc Corp | Coupling stabilizer for moineau pumps |
| US5417281A (en) * | 1994-02-14 | 1995-05-23 | Steven M. Wood | Reverse Moineau motor and pump assembly for producing fluids from a well |
| US5725053A (en) * | 1996-08-12 | 1998-03-10 | Weber; James L. | Pump rotor placer |
| US6886636B2 (en) * | 1999-05-18 | 2005-05-03 | Down Hole Injection, Inc. | Downhole fluid disposal apparatus and methods |
| CA2286823C (en) * | 1999-10-18 | 2002-05-07 | Ed Matthews | Apparatus and method for pumping fluids for use with a downhole rotary pump |
| US6523615B2 (en) * | 2000-03-31 | 2003-02-25 | John Gandy Corporation | Electropolishing method for oil field tubular goods and drill pipe |
| FR2875533A1 (en) * | 2004-09-17 | 2006-03-24 | Inst Francais Du Petrole | METHOD AND SYSTEM FOR DRILLING WITH REVERSE CIRCULATION |
| US9168552B2 (en) * | 2011-08-25 | 2015-10-27 | Smith International, Inc. | Spray system for application of adhesive to a stator tube |
-
2010
- 2010-07-30 AR ARP100102791A patent/AR077348A1/en active IP Right Grant
-
2011
- 2011-03-17 US US13/050,111 patent/US20120034120A1/en not_active Abandoned
- 2011-07-22 CA CA2747117A patent/CA2747117C/en active Active
- 2011-07-28 BR BRPI1103813-6A patent/BRPI1103813B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| CA2747117A1 (en) | 2012-01-30 |
| AR077348A1 (en) | 2011-08-17 |
| BRPI1103813A2 (en) | 2013-04-16 |
| US20120034120A1 (en) | 2012-02-09 |
| BRPI1103813B1 (en) | 2020-10-13 |
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| EEER | Examination request |
Effective date: 20160719 |