EP3494282A1 - Coiled tubing arrangement for wellbore unloading - Google Patents
Coiled tubing arrangement for wellbore unloadingInfo
- Publication number
- EP3494282A1 EP3494282A1 EP16911774.4A EP16911774A EP3494282A1 EP 3494282 A1 EP3494282 A1 EP 3494282A1 EP 16911774 A EP16911774 A EP 16911774A EP 3494282 A1 EP3494282 A1 EP 3494282A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wellbore
- unloading
- coiled tubing
- debris
- bottom hole
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
- E21B17/203—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables with plural fluid passages
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/08—Methods or apparatus for cleaning boreholes or wells cleaning in situ of down-hole filters, screens, e.g. casing perforations, or gravel packs
Definitions
- a wellbore unloading arrangement includes a running string and an unloading bottom hole assembly for removal of debris in the form of solids and liquids from the wellbore.
- the running string is made up of two strings of inner coiled tubing which are disposed within an outer coiled tubing string.
- the unloading bottom hole assembly is affixed to the running string and incorporates a fluid jet pump and debris vacuum as well as a nitrogen injection tool.
- Nitrogen injection during operation of the fluid jet pump decreases the density of fluids within the wellbore proximate the bottom hole assembly, thereby improving the effectiveness of the debris vacuum.
- the inventors have also determined that the combination of fluid jetting, vacuum and nitrogen injection allows a user to unload wellbores at greater depths than with conventional techniques. Nitrogen injection counteracts hydrostatic pressure that could otherwise preclude the removal of debris.
- Figure 1 is a side, cross-sectional view of an exemplary wellbore which contains a wellbore unloading arrangement constructed in accordance with the present invention.
- Figure 2 is an axial cross-section of the running string of the wellbore unloading arrangement.
- Figure 3 is a side view of an exemplary unloading bottom hole assembly in accordance with the present invention.
- Figure 1 illustrates an exemplary wellbore 10 which has been drilled through the earth 12 from the surface 14 down to a hydrocarbon-bearing formation 16.
- Debris 18 is located within the wellbore 10.
- the debris 18 is typically relatively fine and may include sand and cuttings.
- a wellbore unloading arrangement 20 is disposed within the wellbore 10 from the surface 14 via a coiled tubing injector (not shown).
- the wellbore unloading arrangement 20 includes a running string 22 and an unloading bottom hole assembly 24.
- Figure 2 depicts an axial cross-section of the running string 22. It can be seen that the running string 22 includes an outer coiled tubing string 26 which defines a flowbore 28. First and second inner coiled tubing strings 30, 32 are located within the flowbore 28 of the outer coiled tubing string 26.
- FIG. 3 illustrates an exemplary unloading bottom hole assembly 24 in greater detail.
- the unloading bottom hole assembly 24 includes an outer housing 34 with a nose portion 36 having injection nozzles 38 for injection of fluids into the wellbore 10.
- the fluids that can be injected via the injection nozzles 38 are provided via the first and second coiled tubing strings 30, ⁇ 32.
- the lower end of the first coiled tubing string 30 is blocked by a plug 39 to cause fluid flowing through the first coiled tubing string 30 to exit through a lateral opening 41.
- Vacuum ports 40 are located in the housing 34 to permit fluid and solids to enter the flowbore 28 of the outer coiled tubing string 26 from the wellbore 10. Debris 18 will enter the flowbore 28 of the outer coiled tubing string 26 and then to surface 14. Larger debris 18 may be filtered out from entering the flowbore 28 by screening by the vacuum ports 40.
- a nitrogen supply 42 and associated fluid pump 44 are located at surface 14 and are operably associated with the wellbore unloading arrangement 20 to flow nitrogen into the first inner coiled tubing string 30.
- a liquid supply 46 and associated fluid pump 48 are also located at surface 14 and are operably associated with the wellbore unloading arrangement 20 to flow liquid from the liquid supply 46 into the second inner coiled tubing string 32.
- the liquid of the liquid supply 46 is typically water but may be other fluids as well.
- a coiled tubing injection assembly (not shown), of a type well known in the art, is also located at surface 14 and is used to inject the wellbore unloading arrangement 20 into the wellbore 10 as well as remove it from the wellbore 10.
- the wellbore unloading arrangement 20 is disposed into the wellbore 10 and lowered so that the unloading bottom hole assembly 24 is in a desired location proximate the debris 18 to be removed.
- Nitrogen is pumped through the first inner coiled tubing string 30 to the unloading bottom hole assembly 24.
- Non-nitrogen liquid is pumped down the second inner coiled tubing string 32 to the unloading bottom hole assembly 24.
- a fluid jet pump 33 switches between injection of liquid from the second inner coiled tubing string 32 through nozzles 38 and vacuum power to draw debris into the flowbore 28 of the outer coiled tubing string 26 through vacuum ports 40.
- the liquid that is injected through injection nozzles 38 will help dislodge debris 18 within the wellbore 10. This dislodged debris 18 can then be drawn into the flowbore 28 through vacuum ports 40.
- nitrogen can be flowed from the nitrogen source 42 to injection nozzles 38. Nitrogen injection into the wellbore 10 will preferably occur proximate the debris 18 and may be done continuously as injection of liquid and vacuuming occurs. Also, the wellbore unloading arrangement 20 may be moved axially within the wellbore 10 during these operations to help further dislodge debris 18 and aid its removal.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2016/045558 WO2018026370A1 (en) | 2016-08-04 | 2016-08-04 | Coiled tubing arrangement for wellbore unloading |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3494282A1 true EP3494282A1 (en) | 2019-06-12 |
EP3494282A4 EP3494282A4 (en) | 2020-03-25 |
EP3494282B1 EP3494282B1 (en) | 2021-04-21 |
Family
ID=61074006
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16911774.4A Active EP3494282B1 (en) | 2016-08-04 | 2016-08-04 | Coiled tubing arrangement for wellbore unloading |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3494282B1 (en) |
BR (1) | BR112019001850B1 (en) |
MY (1) | MY197513A (en) |
SA (1) | SA519401010B1 (en) |
WO (1) | WO2018026370A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11365607B2 (en) | 2020-03-30 | 2022-06-21 | Saudi Arabian Oil Company | Method and system for reviving wells |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5388650B1 (en) * | 1993-06-14 | 1997-09-16 | Mg Nitrogen Services Inc | Non-cryogenic production of nitrogen for on-site injection in downhole drilling |
US6029746A (en) * | 1997-07-22 | 2000-02-29 | Vortech, Inc. | Self-excited jet stimulation tool for cleaning and stimulating wells |
US6877571B2 (en) * | 2001-09-04 | 2005-04-12 | Sunstone Corporation | Down hole drilling assembly with independent jet pump |
US7048056B1 (en) * | 2003-08-11 | 2006-05-23 | Blake Mark A | Down-hole well cleaning tool |
US7213648B2 (en) * | 2004-03-30 | 2007-05-08 | Kirby Hayes Incorporated | Pressure-actuated perforation with continuous removal of debris |
EP1852571A1 (en) * | 2006-05-03 | 2007-11-07 | Services Pétroliers Schlumberger | Borehole cleaning using downhole pumps |
US9856706B2 (en) * | 2012-06-05 | 2018-01-02 | Halliburton Energy Services, Inc. | Methods and systems for performance of subterranean operations using dual string pipes |
US20140014350A1 (en) * | 2012-07-13 | 2014-01-16 | Morley Sebree | Circulating coil cleanout tool and method |
-
2016
- 2016-08-04 WO PCT/US2016/045558 patent/WO2018026370A1/en unknown
- 2016-08-04 MY MYPI2019000495A patent/MY197513A/en unknown
- 2016-08-04 EP EP16911774.4A patent/EP3494282B1/en active Active
- 2016-08-04 BR BR112019001850-6A patent/BR112019001850B1/en active IP Right Grant
-
2019
- 2019-02-02 SA SA519401010A patent/SA519401010B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
MY197513A (en) | 2023-06-19 |
EP3494282B1 (en) | 2021-04-21 |
EP3494282A4 (en) | 2020-03-25 |
BR112019001850A2 (en) | 2019-05-07 |
WO2018026370A1 (en) | 2018-02-08 |
SA519401010B1 (en) | 2023-01-17 |
BR112019001850B1 (en) | 2022-08-23 |
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