EP0960262B1 - Device by a retrievable bridge plug - Google Patents

Device by a retrievable bridge plug Download PDF

Info

Publication number
EP0960262B1
EP0960262B1 EP98901587A EP98901587A EP0960262B1 EP 0960262 B1 EP0960262 B1 EP 0960262B1 EP 98901587 A EP98901587 A EP 98901587A EP 98901587 A EP98901587 A EP 98901587A EP 0960262 B1 EP0960262 B1 EP 0960262B1
Authority
EP
European Patent Office
Prior art keywords
packer
chain
pin
packer element
bridge plug
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
Application number
EP98901587A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0960262A1 (en
Inventor
Frode Andersen
Dag Ravn Pedersen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BROENNTEKNOLOGIUTVIKLING AS
Original Assignee
BROENNTEKNOLOGIUTVIKLING AS
Bronnteknologiutvikling AS
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 BROENNTEKNOLOGIUTVIKLING AS, Bronnteknologiutvikling AS filed Critical BROENNTEKNOLOGIUTVIKLING AS
Publication of EP0960262A1 publication Critical patent/EP0960262A1/en
Application granted granted Critical
Publication of EP0960262B1 publication Critical patent/EP0960262B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
    • E21B33/1216—Anti-extrusion means, e.g. means to prevent cold flow of rubber packing
    • 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
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
    • 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
    • E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
    • E21B33/1293—Packers; Plugs with mechanical slips for hooking into the casing with means for anchoring against downward and upward movement

Definitions

  • the present invention concerns generally retrievable bridge plugs, but more specifically a drawable mechanical barrier having a packer element, according to the introductory part of patent claim 1.
  • bridge plugs are used for oil- and gas wells.
  • Such bridge plugs (see for example US-A-4 554 973 have a packer element which seals against fluid and pressure.
  • the packer element is comprised mainly of an elastic rubber body sealing against the pressure, and mechanical barriers preventing extrusion of the rubber at pressure load.
  • the bridge plug will, in many cases, have to pass restrictions such as, for example, valves and nipples, for subsequent location in a larger diameter.
  • Known retrievable bridge plugs have a limited degree of expansion at a high pressure and a high temperature. The limitation in the degree of expansion is mainly caused by the construction of the drawable mechanical barrier.
  • a mechanical barrier is developed, which through an axial movement is expanded and then drawn through an opposite movement.
  • the bridge plug changes pressure direction from one side to the other side.
  • two packer elements are installed, having a mechanical barrier inbetween.
  • the rubber When the packer elements are expanded, the rubber will be forced out radially along the mechanical barrier, and up against the casing.
  • the mechanical barrier In expanded position, the mechanical barrier has a wedge shape up against the casing. By applying pressure, the packer element will creep into the radial wedge shape, and seal. This wedge shape also has a positive effect to the sealing property of the packer element at increasing pressure load. If the bridge plug should seal against differential pressure from one side, a mechanical barrier with a packer element is installed at the pressure side.
  • the mechanical barrier positions the mechanical bridge plug in the centre, and thus avoids the extra strain on the packer element from the bridge plug's own weight.
  • the mechanical barrier according to the present invention has a construction whereby it is possible to be actively drawn when running into restrictions. This is performed when the mechanical barrier is subjected to tension, which then leads to the chain pairs rotating around their belonging bolts, thus forcing them against the centre of the bridge plug.
  • the mechanical barrier has a construction making it functionally reliable during the aggregation of sand above the bridge plug.
  • the mechanical barrier being situated between two packer elements is advantageous in this respect.
  • Fig. 1 shows a sketch of a retrievable bridge plug, generally denoted 30, set in a casing 31 in a horizontal well.
  • the bridge plug 30 comprises an anchoring part 32 and a mechanical barrier 1 with packer elements, which are expanded against the casing 31.
  • Fig. 2 illustrates a device according to the present invention, in the form of a mechanical barrier 1 having two packer elements 3, 11 which are arranged at the bridge plug (not shown in Fig. 2), in order to be inserted in, and expanded in the casing (not shown in Fig 2).
  • the device includes a through axle 15 with an external upper packer bracket 2, connecting the upper end (not shown) with upper packer element 3.
  • the upper packer element 3 is connected through an upper clamping section 4 via first pin 5 to an upper chain 6.
  • the upper chain 6 is rotatably connected with lower chain 8 by a second pin 7.
  • the lower chain 8 is connected to a lower clamping section 10 by a third pin 9.
  • Lower clamping section 10 is connected with the lower packer element 11 that is then connected with the lower end of the bridge plug, through a lower packer clamp 12.
  • Fig. 2 the device according to the present invention is shown with the mechanical barrier 1 and the packer elements 3, 11 in drawn (not expanded) condition.
  • An angle ⁇ is formed through the longitudinal axis of the bridge plug and a line extending between first pin 5 and second pin 7. The angle ⁇ is larger then zero, and preferably less then 45° when the mechanical barrier is in this drawn condition.
  • Fig. 3 the device is shown in expanded position, where upper packer bracket 2 is forced against lower packer bracket 12 with the result that upper packer element 3 is compressed and expanded radially.
  • the axial force propagates further down to the upper chain 6 that due to the angle of departure ⁇ (Fig. 2) will rotate around the pin 5 and tip out radially. This will cause the split pipe 18 to bend outwards and be formed around the periphery of the chain pairs 6 and 8.
  • the lower clamping section 10 will compress the packer element 11 which then will expand radially.
  • An upper U-shaped packer 13 is installed in the upper clamping section 2 and a lower U-shaped packer 14 is installed in the lower clamping section 12.
  • Upper U-shaped packer 13 has the function of sealing when the packer element 3 is pressurized, and to drain an enclosed volume C when the packer element 3 is pressurized.
  • Lower U-shaped packer 14 is shown in detail in Fig. 3a.
  • Fig. 4 shows a section view of the mechanical barrier 1 in expanded condition.
  • the pipe 18 is split in a number corresponding to the number of rotatable chain pairs 6 and 8.
  • the pipe 18 is oriented in relation to chain pairs 6 and 8, so that each axial split of the pipe 18 is situated above the middle of each chain pair 6 and 8.
  • the split pipe 18 is supported by the chain pairs 6, 8, so that the mechanical barrier in expanded condition forms a completely sealed barrier.
  • Fig. 5 shows a chain pair comprising rotatable chain 6 and rotatable chain 8.
  • the chain pair 6, 8 is shown in expanded condition, and without belonging pins.
  • Each of the chains 6, 8 is comprised an arm section 19a, 19b with belonging holes 20a, 20b for first and third pin 5 and 9, respectively.
  • the arm sections 19a, 19b are rigidly connected to head section 21a, 21b.
  • the head sections 21a, 21b are at their upper end, formed so that the chains 6, 8 can engage each other, as the second pin (not shown) is brought through hole 25 at the upper end.
  • the head sections 21a, 21b have profiled support surfaces 22a, 22b that are rounded in the axial direction of mechanical barrier 1.
  • the support surfaces 22a, 22b recede into inclined covering surfaces 23, which again recede into inclined end surfaces 24a, 24b.
  • the chains 6, 8 are constructed so that they, in expanded condition, shall form as large an external supporting surface as possible, in order to give the best possible support for the split pipe 18.
  • the optimum width of the chain pairs 6, 8 is the length of the cord belonging to the arc calculated from the circumference of unexpanded bridge plug divided by the number of chain pairs 6, 8. Where the width is the distance between the two external limitations of the chains 6, 8, consisting of the points where the inclined cover surface 23 recedes to inclined end surfaces 24a, 24b.
  • the chains 6, 8 are constructed for achieve a large mechanical strength, so that they can bear the influence from the pressure forces that can occur.
  • the end surfaces 24a, 24b are shaped with an inclination as described above.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Pipe Accessories (AREA)
  • Endoscopes (AREA)
  • Pens And Brushes (AREA)
  • Earth Drilling (AREA)
  • Seal Device For Vehicle (AREA)
  • Devices For Opening Bottles Or Cans (AREA)
EP98901587A 1997-02-06 1998-01-13 Device by a retrievable bridge plug Expired - Lifetime EP0960262B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO970561A NO304615B1 (no) 1997-02-06 1997-02-06 Anordning ved opphentbar broplugg
NO970561 1997-02-06
PCT/NO1998/000009 WO1998035130A1 (no) 1997-02-06 1998-01-13 Device by a retrievable bridge plug

Publications (2)

Publication Number Publication Date
EP0960262A1 EP0960262A1 (en) 1999-12-01
EP0960262B1 true EP0960262B1 (en) 2003-07-16

Family

ID=19900355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98901587A Expired - Lifetime EP0960262B1 (en) 1997-02-06 1998-01-13 Device by a retrievable bridge plug

Country Status (6)

Country Link
EP (1) EP0960262B1 (no)
AU (1) AU726860B2 (no)
BR (1) BR9807558A (no)
CA (1) CA2279374A1 (no)
NO (1) NO304615B1 (no)
WO (1) WO1998035130A1 (no)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9528341B2 (en) 2014-03-25 2016-12-27 Baker Hughes Incorporated Continuous expandable backup ring for a seal with retraction capability

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4554973A (en) * 1983-10-24 1985-11-26 Schlumberger Technology Corporation Apparatus for sealing a well casing
US4588029A (en) * 1984-09-27 1986-05-13 Camco, Incorporated Expandable metal seal for a well tool
US5010958A (en) * 1990-06-05 1991-04-30 Schlumberger Technology Corporation Multiple cup bridge plug for sealing a well casing and method

Also Published As

Publication number Publication date
NO970561D0 (no) 1997-02-06
WO1998035130A1 (no) 1998-08-13
NO304615B1 (no) 1999-01-18
EP0960262A1 (en) 1999-12-01
NO970561L (no) 1998-08-07
AU726860B2 (en) 2000-11-23
CA2279374A1 (en) 1998-08-13
AU5782298A (en) 1998-08-26
BR9807558A (pt) 2000-02-01

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