WO2012150445A2 - Outil de fond de puits - Google Patents

Outil de fond de puits Download PDF

Info

Publication number
WO2012150445A2
WO2012150445A2 PCT/GB2012/050902 GB2012050902W WO2012150445A2 WO 2012150445 A2 WO2012150445 A2 WO 2012150445A2 GB 2012050902 W GB2012050902 W GB 2012050902W WO 2012150445 A2 WO2012150445 A2 WO 2012150445A2
Authority
WO
WIPO (PCT)
Prior art keywords
well bore
sealant
internal chamber
fluid
sealing means
Prior art date
Application number
PCT/GB2012/050902
Other languages
English (en)
Other versions
WO2012150445A3 (fr
Inventor
Paul Bernard Lee
Original Assignee
BYWORTH, Ian
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BYWORTH, Ian filed Critical BYWORTH, Ian
Publication of WO2012150445A2 publication Critical patent/WO2012150445A2/fr
Publication of WO2012150445A3 publication Critical patent/WO2012150445A3/fr

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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/12—Packers; Plugs
    • E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
    • E21B33/1243—Units with longitudinally-spaced plugs for isolating the intermediate space with inflatable sleeves
    • 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
    • E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/10—Reconditioning of well casings, e.g. straightening
    • 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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like

Definitions

  • the present invention relates to a downhole tool for applying a sealant or other fluid to a surface of a well bore and relates particularly, but not exclusively, to a downhole tool for sealing leaking points in an open formation hydrocarbon well bore or leaking points in a casing of a well bore.
  • the present invention seeks to overcome the above
  • a downhole tool for applying a sealant or other fluid to a surface of a well bore, the downhole tool
  • a body arranged to be located in a well bore, the body comprising an internal chamber arranged to receive hydraulic fluid; deformable sealing means arranged to expand outwardly from the body in response to an increase of fluid pressure in the internal chamber, wherein the deformable sealing means is arranged to substantially isolate a portion of the surface of a well bore to prevent fluid communication with other parts of the surface of the well bore; and at least one nozzle arranged to apply sealant to the portion of the surface of the well bore isolated by said sealing means in response to an increase of fluid pressure in the internal chamber.
  • the deformable sealing means comprises at least one elastomeric tubular member mounted to the body, and wherein an internal surface of the or each elastomeric tubular member is in fluid communication with the internal chamber to enable an increase in fluid pressure in the internal chamber to cause the or each said elastomeric tubular member to expand outwardly from the body.
  • This provides the advantage of a sealing means that can be deployed by a simple increase in pressure in the internal diameter of the tool. This enables operators to mount the downhole tool in a work string and operate the sealing means from the surface by an increase in pressure rather than any other type of mechanical means. This therefore provides a straightforward and low cost method of operation.
  • the tool further comprises two elastomeric tubular members disposed at different locations along a longitudinal axis of the body.
  • This provides the advantage of enabling a section of the wall of a well bore to be isolated between two elastomeric tubular members .
  • a first end of the or each said elastomeric tubular member may be mounted to a collar member slidably mounted to the body.
  • the tool further comprises: at least one sealant chamber arranged to provide a supply of sealant to at least one nozzle; and compression means arranged to apply compression to sealant in at least one said sealant chamber and cause the sealant to be dispensed from the respective nozzle in response to an increase in fluid pressure in the internal chamber.
  • the compression means comprises least one floating piston in fluid communication with both the internal chamber and the respective sealant chamber.
  • This provides the advantage of a mechanism that enables sealant to be dispensed in response to an increase in work string pressure.
  • the tool further comprises valve means arranged to close in response to a pressure drop in the internal chamber to indicate a well bore leak.
  • Figure 1 is a longitudinal cross sectional view of a downhole tool embodying the present invention
  • Figure 2A is a close up of the first half of the tool to the left of arrows A in Figure 1;
  • Figure 2B is a close up of the second half of the tool of Figure 1 to the right of arrows B in Figure 1;
  • Figure 3 is a close up longitudinal cross sectional view of the deformable sealing means and nozzles of the tool of Figure 1, showing the deformable sealing means in the collapsed condition;
  • Figure 4 is a close up longitudinal cross sectional view corresponding to Figure 3 but showing the deformable sealing means in the outwardly deployed condition.
  • a downhole tool 2 for applying sealant to a surface of a well bore comprises a body 4 arranged to be located in a well bore, the body 4 comprising an internal chamber 6 arranged to receive a hydraulic working fluid.
  • Deformable sealing means 8 is arranged to expand outwardly from the body 4 in response to an increase of fluid pressure in the internal chamber 6, wherein the deformable sealing means is arranged to substantially isolate a portion 50 of the surface 52 of a well bore to prevent fluid communication with other parts of the surface of the well bore.
  • the downhole tool further comprises at least one nozzle 10 arranged to apply sealant to the portion 50 of the surface of the well bore isolated by said sealing means in response to an increase of fluid pressure in the internal chamber.
  • Well bore is intended to mean either an open formation borehole without a casing, or a borehole that has been cased in a manner that will be familiar to persons skilled in the art. Consequently, tool 2 can be used to seal leaking points in a casing of a well bore or seal parts of an open formation bore hole. The seal can be used to either prevent water leaking in to and contaminating hydrocarbon production in a well bore, or alternatively be used to prevent hydrocarbons from leaching into ground water if there are leaks in the casing of the well bore or casing connections close to the surface where fresh ground water exists.
  • the body 4 comprises an internal chamber in the form of a longitudinal bore 6.
  • the body 4 is interconnected between a top sub 12 and a bottom sub 14 of a work string or drill string as will be familiar to persons skilled in the art.
  • Completion fluid can be pumped along bore 6 by operators on the surface.
  • Deformable sealing means comprises at least one elastomeric tubular member 20 mounted to the body 4.
  • An internal surface 22 of each elastomeric tubular member 20 is in fluid communication with the internal chamber 6 by virtue of a plurality of ports 24 to enable an increase in the fluid pressure in the internal chamber 6 to cause each elastomeric tubular member 6 to expand outwardly from the body as shown in the configuration of Figure 4.
  • Two elastomeric tubular members 20 may be disposed at
  • a first end 26 of each elastomeric tubular member 20 is mounted to a collar 28 slidably mounted to the body 4.
  • the sliding of collar 28 can be seen by comparing the position of collar 28 in Figures 3 and 4. This enables the elastomeric tubular members 20 to expand outwardly and also enables the tubular member 20 to reliably collapse when the tool 2 is pulled out of the well bore.
  • sliding collars 28 are unnecessary if the elastomeric tubular members are formed from a material that enables a large amount of
  • sealant chambers 30 provide a supply of sealant to nozzles 10.
  • Two nozzles 10 connected to respective sealant chambers 30 are shown, to enable a two part epoxy sealant to be applied.
  • Compression means 32 is arranged to apply compression to sealant in the chamber 30 to cause sealant to exit the respective nozzle 10 in response to an increase in fluid pressure in internal chamber 6.
  • the nozzles 10 may also comprise check valves (not shown) which are adapted to open when pressure is applied to dispense sealant or other fluid. The check valves help to prevent foreign material entering nozzles 10 and chambers 30.
  • the compression means comprises floating pistons 34 which form a floating barrier in fluid communication with both internal chamber 6 and sealant chamber 30. Consequently, when the pressure in internal chamber 6 increases, fluid is communicated via ports 36 to floating piston 34 to move floating pistons 34 towards nozzles 10 and dispense sealant through nozzles 10.
  • valve means comprises a check valve 40 arranged to close in response to a pressure drop in the internal chamber 6 to indicate a well bore leak.
  • a check valve 40 arranged to close in response to a pressure drop in the internal chamber 6 to indicate a well bore leak.
  • the pressure in the string is 300 psi
  • valve 40 closes and pressure begin to increase in internal chamber 6.
  • downhole tool 2 is mounted in a work string and moved downwardly along a well bore in manner that will be familiar to persons skilled in the art of deployment of downhole tools.
  • working fluid such as completion fluid is pumped from the surface to fill the tool 2 and well bore with fluid.
  • a ball (not shown) can be dropped to provide a fluid blockage in the work string below tool 2. This causes the annular pressure in the tool to increase. As pressure increases, fluid flows through ports 24 and causes elastomeric tubular members 20 to expand
  • valve 40 also flows through valve 40.
  • the work string is then pulled slowly upwardly in the well bore. This causes the elastomeric tubular members 20 to slide along the surface 52 of the well bore.
  • valve 40 When the tool 2 and valve 40 arrives at a region on the surface 52 at which a leak is located, fluid moving into the leaking point in the well casing or open formation of the wellbore causes a pressure drop in the tool which will be monitored by operators on the surface. Valve 40 is adapted to close in response to such a pressure drop. At the same time, the operators stop pulling the tool 2 upwardly in the well bore a leaking point in the well bore has been located.
  • a pressure increase can then be applied by the pumps on the surface to increase the pressure in the work string.
  • This causes floating pistons 34 ( Figures 1 and 2) to move towards nozzles 10 in chambers 30 to dispense the sealant from nozzles 10 into the portion 50 of the surface 52 of the well bore between the tubular members 20.
  • the downhole tool 2 can be raised again to locate further leaks and repeat the sealing operation. It can therefore been seen that downhole tool can be used to both locate and seal leaking portions of wellbore.
  • Downhole tool 2 can also be used to dispense acid in a well bore rather than sealant. Acid can be used to breakdown casing cement or breakdown carbonate formations as will be familiar to persons skilled in the art.
  • the deformable sealing means could comprise a moving mechanical element that moves against and deforms outwardly the deformable part of the sealing means to form a seal, rather than using the direct influence of fluid
  • the moveable collar would be arranged to move in response to an increase in fluid pressure in the internal chamber.

Abstract

L'invention concerne un outil de fond de puits (2) destiné à appliquer un matériau d'étanchéité ou autre fluide sur une surface d'un puits de forage. Un fond de puits (2) comprend un corps (4) conçu pour être disposé dans un puits de forage, ce corps (4) comprenant une chambre interne (6) conçue pour recevoir un fluide de travail hydraulique. Un moyen de scellement déformable (8) est conçu pour se dilater vers l'extérieur à partir du corps (4), en réponse à une augmentation de la pression de fluide dans la chambre interne (6). Ce moyen de scellement déformable est conçu pour isoler sensiblement une partie (50) de la surface (52) d'un puits de forage pour empêcher la communication de fluide avec d'autres parties de la surface du puits. L'outil de fond de puits selon l'invention comprend également au moins une buse (10) conçue pour appliquer le matériau d'étanchéité sur la partie (50) de la surface du puits de forage isolée par ledit moyen de scellement.
PCT/GB2012/050902 2011-05-04 2012-04-24 Outil de fond de puits WO2012150445A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1107336.8A GB201107336D0 (en) 2011-05-04 2011-05-04 Downhole tool
GB1107336.8 2011-05-04

Publications (2)

Publication Number Publication Date
WO2012150445A2 true WO2012150445A2 (fr) 2012-11-08
WO2012150445A3 WO2012150445A3 (fr) 2013-09-26

Family

ID=44203071

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2012/050902 WO2012150445A2 (fr) 2011-05-04 2012-04-24 Outil de fond de puits

Country Status (2)

Country Link
GB (1) GB201107336D0 (fr)
WO (1) WO2012150445A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11939825B2 (en) 2021-12-16 2024-03-26 Saudi Arabian Oil Company Device, system, and method for applying a rapidly solidifying sealant across highly fractured formations during drilling of oil and gas wells

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2399125A (en) * 1939-07-21 1946-04-23 Dow Chemical Co Well packer
US5027895A (en) * 1989-10-16 1991-07-02 Barton Kenneth S Expandable packer apparatus
US5358048A (en) * 1993-04-27 1994-10-25 Ctc International Hydraulic port collar
WO2001038691A2 (fr) * 1999-11-24 2001-05-31 Shell Internationale Research Maatschappij B.V. Dispositif d'injection d'un fluide dans une formation
AU2002365692B2 (en) * 2001-12-03 2007-09-06 Shell Internationale Research Maatschappij B.V. Method and device for injecting a fluid into a formation
WO2009065793A1 (fr) * 2007-11-19 2009-05-28 Shell Internationale Research Maatschappij B.V. Essai in situ de compatibilité de fluide utilisant un appareil d'essais de couches à câble

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11939825B2 (en) 2021-12-16 2024-03-26 Saudi Arabian Oil Company Device, system, and method for applying a rapidly solidifying sealant across highly fractured formations during drilling of oil and gas wells

Also Published As

Publication number Publication date
WO2012150445A3 (fr) 2013-09-26
GB201107336D0 (en) 2011-06-15

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