CA2137336C - Dual string tubing rotator - Google Patents
Dual string tubing rotator Download PDFInfo
- Publication number
- CA2137336C CA2137336C CA002137336A CA2137336A CA2137336C CA 2137336 C CA2137336 C CA 2137336C CA 002137336 A CA002137336 A CA 002137336A CA 2137336 A CA2137336 A CA 2137336A CA 2137336 C CA2137336 C CA 2137336C
- Authority
- CA
- Canada
- Prior art keywords
- string
- tubing
- production tubing
- bore
- hanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000009977 dual effect Effects 0.000 title claims description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 239000003129 oil well Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 238000011010 flushing procedure Methods 0.000 claims abstract description 3
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 230000000750 progressive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/047—Casing heads; Suspending casings or tubings in well heads for plural tubing strings
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)
- Earth Drilling (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
A producing oil well has two strings, a production tubing string containing a rod-driven pump and a secondary tubing string extending along the well for the supply of flushing or injection fluid to the well bore. Rod wear on the production tubing string is distributed by rotating the production tubing using a tubing rotator mounted on the wellhead. The rotator includes a mandrel and gear drive for rotating the tubing string and an offset for the secondary string that may be connected to a coiled tubing hanger.
Description
~ ~ 37336 DUAL STRING TUBING ROTATOR
FIELD OF THE INVENTION
The present invention relates to dual string oil wells and to methods and apparatus useful in such wells.
BACKGROUND
In a dual string oil well, a production tubing string delivers oil from the well to the surface, while a second tubing string may be used for various purposes, including delivering fluid to the well for flushing or injection purposes, hanging down hole recorders or wireline logging tools.
When a rod-driven pump, for example a progressive cavity pump is used in such a well, the rod operating in the production tubing can rub on the tubing, causing rapid wear. This rubbing may be caused, for example, by rod whipping or by the bending of the rod into contact with the production tubing in a deviated well.
While in single string wells, it has been possible to distribute rod wear on the tubing by rotating the production tubing, it has not been possible to use this technique in a dual tubing string installation. The present invention addresses this problem.
SUMMARY
According to one aspect of the present invention there is provided a dual string tubing rotator for a wellhead, comprising:
a dual hanger for mounting on the wellhead, the hanger having first and second tubing bores therethrough;
a rotatable mandrel extending into the first dual hanger bore, the mandrel having an inlet end engageable with a production tubing string and a delivery end;
mandrel drive means for rotating the mandrel;
rotary coupling means for delivering oil from the delivery end of _2_ the mandrel to a stationary delivery line; and stationary string coupling means for coupling a stationary tubing string to the second tubing bore of the hanger.
The rotator enables the rotation of the production tubing in a dual string well. The stationary string coupling means preferably include an offset section sloping outwardly from the mandrel, away from the hanger.
This allows a coiled tubing hanger to be connected to the stationary string coupling means for running coiled tubing into the well bore.
According to another aspect of the present invention there is provided, in an oil well having a well bore:
production tubing extending along the well bore;
a pump coupled to the production tubing for pumping oil along the production tubing;
rod means extending along the production tubing for driving the pump;
stationary tubing extending along the well bore for introducing fluid into the bore; and means for rotating the production tubing in the bore.
According to a further aspect of the present invention there is provided a method of operating a producing oil well having a well bore, a production tubing string extending along the well bore, a rod-driven pump in the production tubing string and a secondary tubing string extending along the well, said method comprising:
driving the pump to deliver fluid the production tubing; and distributing rod wear on the production tubing by rotating the production tubing.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate exemplary embodiments of the present invention:
Figure 1 is a schematic view of a dual string deviated well;
Figure 2 is a cross-sectional view of a dual string tubing rotator according to the present invention;
Figure 3 is a cross-section of an alternative embodiment of the dual string tubing rotator incorporating a coiled tubing hanger.
DETAILED DESCRIPTION
Referring to the accompanying drawings, and especially to Figure 1, there is illustrated a an oil well 10 having a well bore 12 lined with a well casing 14. The well is a deviated well with a vertical upper section 15, and horizontal lower section 16 and a curved transition section 17 between them. Extending along the casing 14 is a production tubing string 18 connected at its bottom end to a progressive cavity pump 19. The pump is driven by a rotating rod 20 that will, in normal practice, rub on the production tubing 18, causing it to wear. The well casing 14 also contains a guide tube string 22 that contains a string 24 of coiled tubing 25 connected at its end to an injection nozzle 26 for injecting fluid into the well.
At the end of the casing 14 is a slotted liner 28 for admitting oil into the bottom end of the casing.
At the top of the well bore is a hanger 30. Mounted on this wellhead hanger is a tubing rotator 32 that will be described in more detail in the following. This in turn is connected to an integrated blow-out preventer and a flow-tee 34 for delivering the oil produced by the well to a pipeline 35. On top of the blow-out preventer and flow-tee is a rod drive 36 for driving the rod 20.
Shown in broken line in Figure 1 is a coiled tubing hanger 38 connected to the tubing rotator 32 for hanging the coiled tubing 24 from the wellhead .
An embodiment of the dual string tubing rotator 32 is illustrated in Figure 2. This rotator includes a dual hanger 42 that is seated into the wellhead hanger 30. The dual hanger has two bores 44 and 46 for the two tubing strings. The bore 46 accommodates a hanger coupling 48 with a thread 50 for coupling to the top end of the guide string 22 (Figure 1 ).
On top of the wellhead hanger 30, over the hanger 42 is a bonnet 52. This has a base section 54 with an upwardly facing shoulder 56 near the bottom end. The shoulder engages a mating shoulder on a surrounding annular flange 58. This allows the flange to be rotated to bring the bolt holes 59 into line with bolt-holes in the flange on the wellhead hanger 30 regardless of the orientation of the bonnet.
The bonnet 52 has an offset guide string bore 60. This has a bottom end that aligns with the hanger coupling 48 and inclines outwardly from the center of the bonnet. A second bore 62 extends vertically through the bonnet. It has two sets of lands 64 accommodating appropriate packing for sealing the bore to a tubular mandrel 68 extending along the inside of the bore. The mandrel has a tube 70 with a threaded bottom end 72 for connection to a production tubing string. The tube has an external flange 74 partway along that is connected to a worm gear 76. The worm gear rides in a gear casing 77 forming the upper end of the tubular rotator. The worm gear is driven by a worm 78 to rotate the mandrel 68.
The top end of the rotator 32 has a flange 80 and an internal thread 82 for connection to the blow-out preventer and flow-tee.
An alternative embodiment of the invention is illustrated in Figure 3, where the top end of the rotator has an externally threaded pin top connector 84 but is otherwise the same as the previously described rotator.
This rotator is also shown with the guide string of the bore 60 connected to the coiled tubing hanger 40 so that coiled tubing can be run into the well through the guide tubing string.
With the present invention, it is possible for the first time to run a dual string well with the ability to rotate the production tubing string to distribute rod wear.
While certain embodiments of the present invention have been described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention. The invention is to be considered limited solely by the scope of the appended claims.
r
FIELD OF THE INVENTION
The present invention relates to dual string oil wells and to methods and apparatus useful in such wells.
BACKGROUND
In a dual string oil well, a production tubing string delivers oil from the well to the surface, while a second tubing string may be used for various purposes, including delivering fluid to the well for flushing or injection purposes, hanging down hole recorders or wireline logging tools.
When a rod-driven pump, for example a progressive cavity pump is used in such a well, the rod operating in the production tubing can rub on the tubing, causing rapid wear. This rubbing may be caused, for example, by rod whipping or by the bending of the rod into contact with the production tubing in a deviated well.
While in single string wells, it has been possible to distribute rod wear on the tubing by rotating the production tubing, it has not been possible to use this technique in a dual tubing string installation. The present invention addresses this problem.
SUMMARY
According to one aspect of the present invention there is provided a dual string tubing rotator for a wellhead, comprising:
a dual hanger for mounting on the wellhead, the hanger having first and second tubing bores therethrough;
a rotatable mandrel extending into the first dual hanger bore, the mandrel having an inlet end engageable with a production tubing string and a delivery end;
mandrel drive means for rotating the mandrel;
rotary coupling means for delivering oil from the delivery end of _2_ the mandrel to a stationary delivery line; and stationary string coupling means for coupling a stationary tubing string to the second tubing bore of the hanger.
The rotator enables the rotation of the production tubing in a dual string well. The stationary string coupling means preferably include an offset section sloping outwardly from the mandrel, away from the hanger.
This allows a coiled tubing hanger to be connected to the stationary string coupling means for running coiled tubing into the well bore.
According to another aspect of the present invention there is provided, in an oil well having a well bore:
production tubing extending along the well bore;
a pump coupled to the production tubing for pumping oil along the production tubing;
rod means extending along the production tubing for driving the pump;
stationary tubing extending along the well bore for introducing fluid into the bore; and means for rotating the production tubing in the bore.
According to a further aspect of the present invention there is provided a method of operating a producing oil well having a well bore, a production tubing string extending along the well bore, a rod-driven pump in the production tubing string and a secondary tubing string extending along the well, said method comprising:
driving the pump to deliver fluid the production tubing; and distributing rod wear on the production tubing by rotating the production tubing.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate exemplary embodiments of the present invention:
Figure 1 is a schematic view of a dual string deviated well;
Figure 2 is a cross-sectional view of a dual string tubing rotator according to the present invention;
Figure 3 is a cross-section of an alternative embodiment of the dual string tubing rotator incorporating a coiled tubing hanger.
DETAILED DESCRIPTION
Referring to the accompanying drawings, and especially to Figure 1, there is illustrated a an oil well 10 having a well bore 12 lined with a well casing 14. The well is a deviated well with a vertical upper section 15, and horizontal lower section 16 and a curved transition section 17 between them. Extending along the casing 14 is a production tubing string 18 connected at its bottom end to a progressive cavity pump 19. The pump is driven by a rotating rod 20 that will, in normal practice, rub on the production tubing 18, causing it to wear. The well casing 14 also contains a guide tube string 22 that contains a string 24 of coiled tubing 25 connected at its end to an injection nozzle 26 for injecting fluid into the well.
At the end of the casing 14 is a slotted liner 28 for admitting oil into the bottom end of the casing.
At the top of the well bore is a hanger 30. Mounted on this wellhead hanger is a tubing rotator 32 that will be described in more detail in the following. This in turn is connected to an integrated blow-out preventer and a flow-tee 34 for delivering the oil produced by the well to a pipeline 35. On top of the blow-out preventer and flow-tee is a rod drive 36 for driving the rod 20.
Shown in broken line in Figure 1 is a coiled tubing hanger 38 connected to the tubing rotator 32 for hanging the coiled tubing 24 from the wellhead .
An embodiment of the dual string tubing rotator 32 is illustrated in Figure 2. This rotator includes a dual hanger 42 that is seated into the wellhead hanger 30. The dual hanger has two bores 44 and 46 for the two tubing strings. The bore 46 accommodates a hanger coupling 48 with a thread 50 for coupling to the top end of the guide string 22 (Figure 1 ).
On top of the wellhead hanger 30, over the hanger 42 is a bonnet 52. This has a base section 54 with an upwardly facing shoulder 56 near the bottom end. The shoulder engages a mating shoulder on a surrounding annular flange 58. This allows the flange to be rotated to bring the bolt holes 59 into line with bolt-holes in the flange on the wellhead hanger 30 regardless of the orientation of the bonnet.
The bonnet 52 has an offset guide string bore 60. This has a bottom end that aligns with the hanger coupling 48 and inclines outwardly from the center of the bonnet. A second bore 62 extends vertically through the bonnet. It has two sets of lands 64 accommodating appropriate packing for sealing the bore to a tubular mandrel 68 extending along the inside of the bore. The mandrel has a tube 70 with a threaded bottom end 72 for connection to a production tubing string. The tube has an external flange 74 partway along that is connected to a worm gear 76. The worm gear rides in a gear casing 77 forming the upper end of the tubular rotator. The worm gear is driven by a worm 78 to rotate the mandrel 68.
The top end of the rotator 32 has a flange 80 and an internal thread 82 for connection to the blow-out preventer and flow-tee.
An alternative embodiment of the invention is illustrated in Figure 3, where the top end of the rotator has an externally threaded pin top connector 84 but is otherwise the same as the previously described rotator.
This rotator is also shown with the guide string of the bore 60 connected to the coiled tubing hanger 40 so that coiled tubing can be run into the well through the guide tubing string.
With the present invention, it is possible for the first time to run a dual string well with the ability to rotate the production tubing string to distribute rod wear.
While certain embodiments of the present invention have been described in the foregoing, it is to be understood that other embodiments are possible within the scope of the invention. The invention is to be considered limited solely by the scope of the appended claims.
r
Claims (11)
1. A method of operating a producing oil well having a well bore, a production tubing string extending along the well bore, a rod-driven pump in the production tubing string and a secondary tubing string extending along the well beside the production tubing string, said method comprising:
driving the pump to deliver fluid to the production tubing string; and distributing rod wear on the production tubing string by rotating the production tubing string.
driving the pump to deliver fluid to the production tubing string; and distributing rod wear on the production tubing string by rotating the production tubing string.
2. A method according to Claim 1 comprising introducing fluid into the bore through the secondary tubing string.
3. A method according to Claim 2 comprising flushing the bore with the fluid introduced through the secondary tubing string.
4. A method according to Claim 2 comprising injecting fluid into the well bore with the secondary tubing string.
5. In an oil well having a well bore:
production tubing extending along the well bore;
a pump coupled to the production tubing for pumping oil along the production tubing;
rod means extending along the production tubing for driving the pump;
stationary tubing extending along the well bore beside the production tubing; and means for rotating the production tubing in the bore.
production tubing extending along the well bore;
a pump coupled to the production tubing for pumping oil along the production tubing;
rod means extending along the production tubing for driving the pump;
stationary tubing extending along the well bore beside the production tubing; and means for rotating the production tubing in the bore.
6. An oil well according to Claim 5 wherein the stationary tubing includes a guide tube string and coiled tubing extending along the guide tube string.
7. An oil well according to Claim 5 wherein the pump is a rotary pump.
8. A dual string tubing rotator for a wellhead, comprising:
a hanger for mounting on the wellhead, the hanger having first and second tubing bores therethrough;
a rotatable mandrel extending into the first hanger bore, the mandrel having an inlet end engageable with a production tubing string and a delivery end;
mandrel drive means for rotating the mandrel;
means for delivering oil from the delivery end of the mandrel to a stationary delivery line; and stationary string coupling means for coupling a stationary tubing string to the second tubing bore of the hanger.
a hanger for mounting on the wellhead, the hanger having first and second tubing bores therethrough;
a rotatable mandrel extending into the first hanger bore, the mandrel having an inlet end engageable with a production tubing string and a delivery end;
mandrel drive means for rotating the mandrel;
means for delivering oil from the delivery end of the mandrel to a stationary delivery line; and stationary string coupling means for coupling a stationary tubing string to the second tubing bore of the hanger.
9. A rotator according to Claim 8 including a bonnet over the hanger, the bonnet comprising an offset bore communicating with the second of the hanger bores and diverging from the mandrel in a direction away from the hanger.
10. A rotator according to Claim 9 wherein the mandrel drive means comprise a gear drive on the bonnet.
11. A rotator according to Claim 8, 9 or 10 including a coiled tubing hanger mounted on the stationary string coupling means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002137336A CA2137336C (en) | 1994-12-05 | 1994-12-05 | Dual string tubing rotator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002137336A CA2137336C (en) | 1994-12-05 | 1994-12-05 | Dual string tubing rotator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2137336A1 CA2137336A1 (en) | 1996-06-06 |
| CA2137336C true CA2137336C (en) | 2004-11-02 |
Family
ID=4154803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002137336A Expired - Lifetime CA2137336C (en) | 1994-12-05 | 1994-12-05 | Dual string tubing rotator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2137336C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2708739C1 (en) * | 2019-09-30 | 2019-12-11 | Публичное акционерное общество «Татнефть» имени В.Д. Шашина | Wellhead adapter coil |
| RU2708738C1 (en) * | 2019-04-30 | 2019-12-11 | Публичное акционерное общество «Татнефть» имени В.Д. Шашина | Universal transient coil of wellhead fittings (versions) |
| RU2796145C1 (en) * | 2023-03-10 | 2023-05-17 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Wellhead valve adapter coil for preventer with two rows of rams (embodiments) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2175641C (en) * | 1996-05-02 | 2002-05-14 | Andrew Wright | Dual tubing string hanging apparatus |
| WO2009102601A2 (en) * | 2008-02-11 | 2009-08-20 | Cameron International Corporation | Angled-penetrator device and system |
| US8544539B2 (en) | 2010-08-25 | 2013-10-01 | Cameron International Corporation | Independent guide string hanger |
| WO2012034209A1 (en) | 2010-09-15 | 2012-03-22 | Evolution Oil Tools Inc. | Anchor for a tubing string and method |
| CN116591621B (en) * | 2023-07-14 | 2023-09-26 | 大庆辰平钻井技术服务有限公司 | Coiled tubing traction device |
-
1994
- 1994-12-05 CA CA002137336A patent/CA2137336C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2708738C1 (en) * | 2019-04-30 | 2019-12-11 | Публичное акционерное общество «Татнефть» имени В.Д. Шашина | Universal transient coil of wellhead fittings (versions) |
| RU2708739C1 (en) * | 2019-09-30 | 2019-12-11 | Публичное акционерное общество «Татнефть» имени В.Д. Шашина | Wellhead adapter coil |
| RU2796145C1 (en) * | 2023-03-10 | 2023-05-17 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Wellhead valve adapter coil for preventer with two rows of rams (embodiments) |
| RU2805701C1 (en) * | 2023-04-03 | 2023-10-23 | Публичное акционерное общество "Татнефть"имени В.Д.Шашина | Method for installing preventer on support flange of wellhead assembly and constant tripping out two-lift arrangement of downhole equipment from well and device for its implementation |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2137336A1 (en) | 1996-06-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20141205 |