WO2017171725A1 - Dispositif pour la connexion de tiges pour l'entraînement en rotation d'un appareil de pompage de fond de trou - Google Patents
Dispositif pour la connexion de tiges pour l'entraînement en rotation d'un appareil de pompage de fond de trou Download PDFInfo
- Publication number
- WO2017171725A1 WO2017171725A1 PCT/US2016/024639 US2016024639W WO2017171725A1 WO 2017171725 A1 WO2017171725 A1 WO 2017171725A1 US 2016024639 W US2016024639 W US 2016024639W WO 2017171725 A1 WO2017171725 A1 WO 2017171725A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coupling
- rod
- rods
- threaded
- connection
- Prior art date
Links
- 238000005086 pumping Methods 0.000 title description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 77
- 238000005859 coupling reaction Methods 0.000 claims abstract description 77
- 230000008878 coupling Effects 0.000 claims abstract description 76
- 241000282472 Canis lupus familiaris Species 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 abstract description 10
- 230000000750 progressive effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
- F16D1/04—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like with clamping hub; with hub and longitudinal key
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0423—Threaded with plural threaded sections, e.g. with two-step threads
-
- 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
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
Definitions
- a common method of lifting fluid from an oil well, the progressive cavity pumping system utilizes a string of steel rods attached to a progressive cavity pump at the bottom of the well, that are rotated by a drive mechanism at the surface to activate the pump.
- This string of rods is similar to that used in a beam, or sucker rod, pumping apparatus, sharing an identical method of connection between the individual sections of rod, but utilizes rotational rather than reciprocating motion to activate the downhole pump.
- connection between rod segments utilized in both sucker rod pumping systems and progressive pumping systems consists of threaded pins at the ends of the rod segments, that are joined via an internally threaded female coupling.
- the threaded pins of the two rods to be joined are screwed into the female-coupling antil the machined ends of the coupling are tightly made up against machined shoulders on the rods.
- the existing system for joining the individual rods that make up the rod string used to rotationally drive a downhole pump consists of threaded pins at the ends of the rods connected via a female threaded coupling.
- the rods are equipped with machined shoulders near the threaded pins, and the rods are screwed into the coupling until the rod shoulders make up tightly against the ends of the coupling.
- the torsional force of one rod is transmitted to Lhe "adjacent rod through: the coupling via ti°ie frieb ' on-between the-maehined surfaces of the rod shoulders and the ends of the coupling.
- a further, but lesser, problem with the existing rod connection system is the backing-off separation of the rods. Since the existing connection consists typically of right-hand threaded members, back spinning of the rod string, which will occur with progressive cavity pumps whenever the surface drive is shut off, can result in the unscrewing of one or more of the connections, requiring a costly well service to reconnect the rods.
- the present invention eliminates all of these problems with the existing rod connections by physically linking adjacent rods for torsional load transmission via a dog dutch, or similar connection between the rods, thereby removing the torsional loading of the threads and holding the rods end together via a right-left threaded coupling that cannot over-tighten nor back-off after make up.
- FIG. 1 shows the threaded pin end of a conventional sucker, or drive rod, in position for an existing type connection to an adjacent rod;
- FIG. 2 shows the threaded pin end of the adjacent sucker, or drive rod, in position for connection
- FIG. 3 shows a side view of a female internally threaded coupling
- FIG. 4 shows a semi transparent view of the FIG 3. coupling,- - showing the internal female threads
- FIG. 5 shows the FIGS. 1 and 2 rod ends partially connected via the FIG. 3 threaded coupling, where the coupling has been made up finger tight on the FIG. 1 threaded pin, and the FIG. 2 threaded pin is partially screwed into the coupling;
- FIG. 6 shows the connection between the FIG. 1 and FIG. 2 rods completely made up, with a cut-away through the coupling showing the relative position of the threaded pins;
- FIG. 7 shows the end of a rod of the present invention, in position for connection to an adjacent rod, showing the left-hand threads and the side view of a dog dutch element;
- FIG. 8 shows the end of the adjacent rod of the present invention in position for connection, showing the right-hand threads and the side view of the dog clutch elements
- FIG. 9 is an end view of the FIG. 7 rod, showing the position of the dog dutch elements
- FIG. 10 is an end view of the FIG. 8 rod, showing the position of the dog dutch elements oriented to mate with the dog dutch elements of FIG. 9.
- FIG. 11 shows the FIG. 7 and FIG. 8 rod ends of the present invention in partial engagement, with the FIG. 11 coupling not shown for darity;
- FIG. 13 is a semi-transparent side view of the threaded female coupling of the present invention, showing the internal threads of both right and left-hand sense;
- FIG. 14 shows the initial stage of the connection process of the present invention, showing the relative rotation of the FIG. 11 coupling as the rods of FIGS. 7 and 8 are pulled together by the reverse threaded coupling;
- FIG. 15 shows the connection process of the present invention partially complete, showing the continued rotation of the coupling
- FIG. 16 shows the connection process of the present invention complete
- FIG. 17 shows the made-up connection of the present invention, with a cut-away through the coupling to show the dog dutch elements completely engaged, as in FIG. 13;
- FIGS. 18 and FIG. 19 show an alternative method to torsionally join the rod ends of the present invention, utilizing a spline
- FIG. 20 shows a semi-transparent view of the end of the FIG. 19 rod, showing the female spline which mates with the male spline stub of FIG. 18.
- FIG. 1 The general configuration of the rod connection for both sucker rods and drive rods is shown in FIG. 1.
- the coupling assembly consisting of the transition flare, 13, the wrench flat, 15, the rod shoulder, 17, with the machined surface 19 facing the threaded rod pin, 21.
- the threads of the threaded rod pin are right-hand, as is the norm in the petroleum industry.
- the adjacent rod shown as FIG. 2, has the same components of the coupling assembly, including right-hand threads on the threaded rod pin.
- FIG. 1 and FIG. 2 are joined via an internally threaded female coupling, 23, shown in side-view in FIG.3. Both ends of the internally threaded coupling 23 are machined flat surfaces 25 and 27, and are designed to bear against the machined surfaces 19 and 20 of the rod shoulders 17 and 18.
- the internal threads of the internally threaded female coupling 23, shown as 29 and 31, are shown in FIG. 4. Note that both internal threads 29 and 31 are right-hand threads to mate with the right-hand threads of the threaded rod pins 21 and 22, respectively.
- connection between the two rods is affected by first screwing internally threaded female coupling 23 on to the threaded rod pin 21 of FIG. 1 rod until hand tight , then screwing the adjacent FIG.2 rod into the
- FIG. 6 also shows, via a cut-away of the internally threaded female coupling 23, the relative positions of the threaded rod pins 21 and 22 of the joined rods. Note that they are not in physical contact with one another.
- the threaded rod pins 21 and 22 are not in direct physical contact.
- the only connection between the rods for torque transmission is via the internally threaded female coupling, 23.
- Internally threaded female coupling 23 is not fixedly connected to either rod, or through another mechanical means like a spline or other toothed connection.
- the only effective torsional connection internally threaded female coupling 23 has with either rod is via the friction between the machined flat surface ends 25 and 27 of the internally threaded female coupling, and the machined surfaces 19 and 20 of the rod shoulders 17 and 18, respectively. This frictional connection is only effective if the aforesaid machined surfaces are completely clean and dry, so that the make-up of the connection results in a "locked" condition, held in place by static friction that is greater than what any expected torque could overcome.
- Threaded connections such as that shown in FIG. 6, with the aforesaid machined ends 25 and 27, and machined surfaces 19 and 20 that are less than perfectly clean and dry, are prone to gradually tighten during operation, and particularly due to torque surges during start-up, finally causing the pin threads to fail in sheer, or the pin body to fail in tension. Less than dean connections also could loosen and back off during back-spin when the system is shut-down. All of these attendant problems of the existing rod connection when used in a rotational drive system can be eliminated by utilizing the present invention.
- the present invention gets around this problem by utilizing a coupling with both right and left hand threads, which engages with the threaded rod pins 20 and 21 with similar right and left hand thread, rather like a turnbuckle, to draw the rods together in a fixed rotational position relative to one another, so that a mechanical torsional connection of some sort can be engaged as the rods are being pulled together.
- FIGS 7 and 8 the-adjacent ends of two rods to - be connected are shown. Both rods are similar to those shown in FIGS. 1 and 2, having, respectively, a rod body 33 and 34, wrench flat 35 and 36, shoulder 37 and 38 and a threaded rod pin 39 and 40.
- FIG. 1 and 2 having, respectively, a rod body 33 and 34, wrench flat 35 and 36, shoulder 37 and 38 and a threaded rod pin 39 and 40.
- FIG. 1 and 2 the FIG.
- FIG. 7 threaded rod pin 39 has a left-hand thread, as opposed to the right-hand thread of threaded rod pin 21.
- the FIG. 8 threaded rod pin 40 has a right-hand thread.
- the rod of FIG. 7 has dogs 41 and 43 (43 not visible in this view), and the rod of FIG. 8 has dogs 42 and 44.
- Each dog is a machined steel "lug", with the quarter circle cross-sectional shape, with each rod having two dogs 180° apart, as seen in the end views of the rod ends shown as FIGS. 9 and 10.
- the dogs 41 and 43 on the FIG. 7 rod, and the dogs 42 and 44 on the FIG. 8 rod are machined to interlock and engage snugly together, as seen in FIGS. 11 and 12, forming mechanical torsional connection between the rods that is significantly stronger than the torsional limit of the rod body 33 and 34.
- FIGS. 11 and 12 show how the dogs engage, with the female coupling 45 holding them together, not shown for clarity.
- the female coupling 45 is shown in FIG. 13, with the semi-transparent view showing the left-hand internal threads 47 on the left, matching the left-hand threads 39 of the FIG. 7 threaded rod pin 40, and the right-hand internal threads 48 on the right, matching the right-hand threads of the FIG. 8 threaded rod pin 40.
- FIGS. 14, 15 and 16 show how the connection between the adjacent rods is made-up. The rod ends are inserted into the adjacent ends of the female coupling 45, which is rotated in the direction shown by the white arrow, A.
- FIG. 17 shows the made-up connection, with a cut-away in the coupling showing the fully engaged dog dutch members.
- the rods cannot rotate relative to one another, and the connection is secure. The only way it can come apart is if the female coupling 45 is unscrewed. Rotation of the rod string has no effect on the integrity of the coupling threaded connection with the rods, as the torque in the system is transmitted entirely via the dog dutch connection between the rods.
- the female coupling 45 has only to carry the tensional load of the rod weight. No particular amount of torque is required to make up this connection, as there is no required friction between components to transmit torque. Because of this, the components do not have to be-particularly cean or dry during assembly.
- the female coupling 45 need not be made up with appreciable torque, there may be circumstances where, through vibration or rubbing against the inner tubing wall, the female coupling 45 may begin to unscrew if not restrained somehow.
- one or both of the threaded rod pins 39 and 40 would be cut with a tapered thread so as to require some nominal torque to make up the connection between female coupling 45 and the threaded rod pins 39 and 40. This nominal torque would serve to keep the female coupling 45 from backing off in every circumstance.
- any one or more of these alternative methods could be utilized in the present invention to prevent the female coupling 45 becoming inadvertently disconnected from the threaded rod pins 39 and 40.
- FIGS. 18, 19 and 20 show such an alternative system consisting of a spline connection between the rods.
- FIG. 20 shows, via a semi-transparent view, the internal female spline 53. This spline system would be more costly to manufacture, and not as strong as the preferred dog dutch system, but would function similarly.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
L'invention concerne un dispositif pour relier des tiges de pompage ou des tiges d'entraînement, constitué d'un raccord fileté, dont une extrémité a un filetage femelle à droite et l'autre extrémité un filetage femelle à gauche, qui relie les broches filetées de tiges adjacentes. Les extrémités des broches sont équipées de taquets, ou d'ergots, qui s'emboîtent lorsque la connexion est réalisée, reliant solidement les tiges en torsion. L'accouplement sert uniquement à maintenir les taquets, ou les ergots, en prise et à supporter la charge de tension sur la connexion. Une telle connexion offre une liaison en torsion plus solide entre les tiges que les connexions actuellement disponibles. La connexion ne nécessite pas non plus la procédure de fabrication spéciale des systèmes actuels et ne peut pas produire un serrage excessif ou un desserrage pendant le fonctionnement.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2016/024639 WO2017171725A1 (fr) | 2016-03-29 | 2016-03-29 | Dispositif pour la connexion de tiges pour l'entraînement en rotation d'un appareil de pompage de fond de trou |
CA3018816A CA3018816A1 (fr) | 2016-03-29 | 2016-03-29 | Dispositif pour la connexion de tiges pour l'entrainement en rotation d'un appareil de pompage de fond de trou |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2016/024639 WO2017171725A1 (fr) | 2016-03-29 | 2016-03-29 | Dispositif pour la connexion de tiges pour l'entraînement en rotation d'un appareil de pompage de fond de trou |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017171725A1 true WO2017171725A1 (fr) | 2017-10-05 |
Family
ID=55697522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2016/024639 WO2017171725A1 (fr) | 2016-03-29 | 2016-03-29 | Dispositif pour la connexion de tiges pour l'entraînement en rotation d'un appareil de pompage de fond de trou |
Country Status (2)
Country | Link |
---|---|
CA (1) | CA3018816A1 (fr) |
WO (1) | WO2017171725A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11428259B2 (en) | 2020-03-30 | 2022-08-30 | Plainsman Mfg. Inc. | Shear coupling and method of assembling same |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5794985A (en) * | 1995-03-23 | 1998-08-18 | Hydril Company | Threaded pipe connection |
US6070912A (en) * | 1989-08-01 | 2000-06-06 | Reflange, Inc. | Dual seal and connection |
US20110150596A1 (en) * | 2009-12-17 | 2011-06-23 | Weatherford/Lamb, Inc. | Shear coupling assembly for use with rotary and reciprocating pumps |
-
2016
- 2016-03-29 WO PCT/US2016/024639 patent/WO2017171725A1/fr active Application Filing
- 2016-03-29 CA CA3018816A patent/CA3018816A1/fr not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6070912A (en) * | 1989-08-01 | 2000-06-06 | Reflange, Inc. | Dual seal and connection |
US5794985A (en) * | 1995-03-23 | 1998-08-18 | Hydril Company | Threaded pipe connection |
US20110150596A1 (en) * | 2009-12-17 | 2011-06-23 | Weatherford/Lamb, Inc. | Shear coupling assembly for use with rotary and reciprocating pumps |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11428259B2 (en) | 2020-03-30 | 2022-08-30 | Plainsman Mfg. Inc. | Shear coupling and method of assembling same |
US11965537B2 (en) | 2020-03-30 | 2024-04-23 | Plainsman Mfg. Inc. | Shear coupling and method of assembling same |
Also Published As
Publication number | Publication date |
---|---|
CA3018816A1 (fr) | 2017-10-05 |
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