WO2018208744A1 - Dual bore packer with axially offset mandrel threads - Google Patents
Dual bore packer with axially offset mandrel threads Download PDFInfo
- Publication number
- WO2018208744A1 WO2018208744A1 PCT/US2018/031543 US2018031543W WO2018208744A1 WO 2018208744 A1 WO2018208744 A1 WO 2018208744A1 US 2018031543 W US2018031543 W US 2018031543W WO 2018208744 A1 WO2018208744 A1 WO 2018208744A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bores
- connections
- connection arrangement
- mandrel
- bore
- Prior art date
Links
- 230000009977 dual effect Effects 0.000 title abstract description 11
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
Definitions
- the field of the invention is dual bore packers and more particularly packers where the mandrel end connections are axially offset to allow greater wall area about the thread for the required pressure rating.
- dual bore packers typically have two adjacent bores with threaded end connections for connecting a tubular string or a cable.
- One application for dual bore packers is for electric submersible pump service where the smaller of the bores is for a power cable to the pump and the larger bore is connected to the discharge of the pump to bring produced fluids to the surface.
- the threaded connections have to deliver a required pressure rating and if the threads are disposed next to each other at the upper face of the mandrel there has to be a tradeoff between making the thread as large as possible for less resistance to flow and making the connections stout enough to handle the anticipated operating pressures for the application. Since the thread forms are tapered juxtaposing two threads near each other limits the available wall between them so as to reduce the pressure rating of the connections. In dual bore packers the center of each bore is offset from the center of the packer.
- the present invention offers a simple solution to this design conflict between making the bores as large as possible and giving the connections the highest possible pressure rating.
- the solution is to axially offset the threads in adjacent bores to maximize the available surrounding wall thickness so that in a given packer mandrel size the diameter and pressure rating of the two bores is maximized.
- a dual bore packer features axially offset tapered thread connections so that the pressure rating and size of the connections in each of the bores can be as large as possible. This is enabled by providing as thick a wall as possible between the bores in the zone where the connecting tapered thread is placed.
- FIG. 1 is a section view of a dual bore packer showing the offset thread locations in adjacent bores
- FIG. 2 is an end view of FIG. 1.
- FIG. 1 A mandrel end 10 of a dual bore packer of a type known in the art is shown in FIG. 1.
- First bore 12 is disposed parallel to second bore 14.
- bore 12 is larger than bore 14 such as in applications for an electric submersible pump where the production discharge line from the pump is connected to bore 12 and a power cable goes through bore 14.
- the bores 12 and 14 have their centers offset from the center of the mandrel 10.
- Bore 12 has a threaded connection 16 axially offset and preferably not overlapping from thread 18 in bore 14. In the case of more bores than two it is preferred that each connection be at least offset if not non-overlapping from all the other connections on the mandrel.
- thread 18 is tapered, the result is the wall 20 between the bores 12 and 14 gets thinner. The same is true for thread 16 at wall portion 22. However, because threads 16 and 18 are axially offset and preferably non-overlapping in the axial direction there is no need to reduce the pressure rating of either threaded connection because placement of the thread takes away some of the wall. Instead the available wall thickness at each thread location is as large as possible availing a higher pressure rating to the connection than if the two threads were axially aligned or even if they were only in part axially overlapping. While tapered threads are discussed as the end connections, those skilled in the art will appreciate that other types of connections are envisioned whether threaded, socket welded, bayonet or another form of connection. [0009] The above description is illustrative of the preferred embodiment and many modifications may be made by those skilled in the art without departing from the invention whose scope is to be determined from the literal and equivalent scope of the claims below:
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- 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)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A dual bore packer features axially offset tapered thread connections so that the pressure rating and size of the connections in each of the bores can be as large as possible. This is enabled by providing as thick a wall as possible between the bores in the zone where the connecting tapered thread is placed.
Description
DUAL BORE PACKER WITH AXIALLY OFFSET MANDREL THREADS
FIELD OF THE INVENTION
[0001] The field of the invention is dual bore packers and more particularly packers where the mandrel end connections are axially offset to allow greater wall area about the thread for the required pressure rating.
BACKGROUND OF THE INVENTION
[0002] Typically dual bore packers have two adjacent bores with threaded end connections for connecting a tubular string or a cable. One application for dual bore packers is for electric submersible pump service where the smaller of the bores is for a power cable to the pump and the larger bore is connected to the discharge of the pump to bring produced fluids to the surface.
Some examples of dual bore packers with axially aligned threads are US 9611722 and US 6390198.
[0003] Typically the threaded connections have to deliver a required pressure rating and if the threads are disposed next to each other at the upper face of the mandrel there has to be a tradeoff between making the thread as large as possible for less resistance to flow and making the connections stout enough to handle the anticipated operating pressures for the application. Since the thread forms are tapered juxtaposing two threads near each other limits the available wall between them so as to reduce the pressure rating of the connections. In dual bore packers the center of each bore is offset from the center of the packer.
[0004] The present invention offers a simple solution to this design conflict between making the bores as large as possible and giving the connections the highest possible pressure rating. The solution is to axially offset the threads in adjacent bores to maximize the available surrounding wall thickness so that in a given packer mandrel size the diameter and pressure rating of the two bores is maximized. These and other aspects of the present invention will be more readily apparent to those skilled in the art from a description of the preferred embodiment and the associated drawings while recognizing that the full scope of the invention can be determined from the appended claims.
SUMMARY OF THE INVENTION
[0005] A dual bore packer features axially offset tapered thread connections so that the pressure rating and size of the connections in each of the bores can be as large as possible. This is enabled by providing as thick a wall as possible between the bores in the zone where the connecting tapered thread is placed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a section view of a dual bore packer showing the offset thread locations in adjacent bores;
[0007] FIG. 2 is an end view of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0008] A mandrel end 10 of a dual bore packer of a type known in the art is shown in FIG. 1. First bore 12 is disposed parallel to second bore 14. In one application bore 12 is larger than bore 14 such as in applications for an electric submersible pump where the production discharge line from the pump is connected to bore 12 and a power cable goes through bore 14. Typically the bores 12 and 14 have their centers offset from the center of the mandrel 10. Bore 12 has a threaded connection 16 axially offset and preferably not overlapping from thread 18 in bore 14. In the case of more bores than two it is preferred that each connection be at least offset if not non-overlapping from all the other connections on the mandrel. Because thread 18 is tapered, the result is the wall 20 between the bores 12 and 14 gets thinner. The same is true for thread 16 at wall portion 22. However, because threads 16 and 18 are axially offset and preferably non-overlapping in the axial direction there is no need to reduce the pressure rating of either threaded connection because placement of the thread takes away some of the wall. Instead the available wall thickness at each thread location is as large as possible availing a higher pressure rating to the connection than if the two threads were axially aligned or even if they were only in part axially overlapping. While tapered threads are discussed as the end connections, those skilled in the art will appreciate that other types of connections are envisioned whether threaded, socket welded, bayonet or another form of connection.
[0009] The above description is illustrative of the preferred embodiment and many modifications may be made by those skilled in the art without departing from the invention whose scope is to be determined from the literal and equivalent scope of the claims below:
Claims
1. A connection arrangement for a multi-bore packer for borehole use, characterized by:
a mandrel (10) having multiple bores (12,14), each said bore having a connection (16,18) wherein connections in said bores are axially offset from each other.
2. The connection arrangement of claim 1, wherein:
said connections (16,18) do not axially overlap.
3. The connection arrangement of claim 2, wherein:
said connections (16,18) comprise tapered thread.
4. The connection arrangement of claim 2, wherein:
at least one said connection starts at an end of said mandrel.
5. The connection arrangement of claim 2, wherein:
said bores (12,14) are different sizes.
6. The connection arrangement of claim 2, wherein:
said bores have centers offset from a center of said mandrel (10).
7. The connection arrangement of claim 2, further comprising:
a power cable for an electric submersible pump connected to one of said bores and a tubular string connected to another of said bores to direct flow from said pump to a remote location.
8. The connection arrangement of claim 1, wherein:
said mandrel (10) comprises two said bores (12,14) .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/591,773 | 2017-05-10 | ||
US15/591,773 US20180328135A1 (en) | 2017-05-10 | 2017-05-10 | Dual Bore Packer with Axially Offset Mandrel Threads |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018208744A1 true WO2018208744A1 (en) | 2018-11-15 |
Family
ID=64095973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2018/031543 WO2018208744A1 (en) | 2017-05-10 | 2018-05-08 | Dual bore packer with axially offset mandrel threads |
Country Status (2)
Country | Link |
---|---|
US (1) | US20180328135A1 (en) |
WO (1) | WO2018208744A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4467866A (en) * | 1982-03-17 | 1984-08-28 | Ava International, Inc. | Flow controlling apparatus |
US4505331A (en) * | 1982-11-08 | 1985-03-19 | Ava International Corporation | Side pocket mandrel |
US4930573A (en) * | 1989-04-06 | 1990-06-05 | Otis Engineering Corporation | Dual hydraulic set packer |
US6158513A (en) * | 1998-07-31 | 2000-12-12 | Halliburton Energy Services, Inc. | Multiple string completion apparatus and method |
WO2014028365A2 (en) * | 2012-08-16 | 2014-02-20 | Bp Corporation North America, Inc. | System and method for producing through a multi bore tubing hanger to a subsea manifold without bop modifications |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2182549A (en) * | 1938-10-12 | 1939-12-05 | R E Kline | Packer |
US20020007411A1 (en) * | 1998-08-10 | 2002-01-17 | Shvat Shaked | Automatic network user identification |
-
2017
- 2017-05-10 US US15/591,773 patent/US20180328135A1/en not_active Abandoned
-
2018
- 2018-05-08 WO PCT/US2018/031543 patent/WO2018208744A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4467866A (en) * | 1982-03-17 | 1984-08-28 | Ava International, Inc. | Flow controlling apparatus |
US4505331A (en) * | 1982-11-08 | 1985-03-19 | Ava International Corporation | Side pocket mandrel |
US4930573A (en) * | 1989-04-06 | 1990-06-05 | Otis Engineering Corporation | Dual hydraulic set packer |
US6158513A (en) * | 1998-07-31 | 2000-12-12 | Halliburton Energy Services, Inc. | Multiple string completion apparatus and method |
WO2014028365A2 (en) * | 2012-08-16 | 2014-02-20 | Bp Corporation North America, Inc. | System and method for producing through a multi bore tubing hanger to a subsea manifold without bop modifications |
Also Published As
Publication number | Publication date |
---|---|
US20180328135A1 (en) | 2018-11-15 |
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