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
  • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
  • E21B19/12—Rope clamps ; Rod, casings or tube clamps not secured to elevators
• • 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
  • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
  • E21B19/02—Rod or cable suspensions
  • E21B19/04—Hooks
• • 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
  • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
  • E21B19/02—Rod or cable suspensions
  • E21B19/06—Elevators, i.e. rod- or tube-gripping devices
  • E21B19/07—Slip-type elevators

Definitions

• each lifting lug has an outer diameter of about 1200 mm and a height of about 550 mm.
• Each lifting lug abuts one of the collar segments over substantially the full height of each collar segment to which it is joined by four connection bolts having a diameter of about 50 mm.
• Each connection bolt is tightened up to near its torque limit of about 100 kNm. It is difficult to undo such bolts on a conductor riser pipe, which may be moving, particularly as tools for undoing such bolts have to be secured to the pipe in order to provide the required torque. It is an object of the present invention to provide a more convenient tension ring assembly having a radially compact collar to which at least one lifting or tensioning lug may be removably connected.
• a tension ring assembly for securing around a pipe, the assembly comprising a tension ring, at least one lifting lug and at least one securing pin for removably securing said lifting lug to the tension ring so that the tension ring, and a pipe around which the tension ring has been secured, can be upwardly tensioned
• the tension ring comprising: a plurality of collar segments configured to be assembled into a ring, said assembled ring of collar segments extending around a ring axis and having in a radially outer face of said assembled ring at least one recess to which said lifting lug is secured; at least one collar segment connection member for connecting the collar segments together to form said assembled ring when said collar segments are assembled around said pipe, said collar segment having for said recess at least one bore into which a corresponding securing pin may, in use, be removably inserted, said bore intersecting said recess such that a portion of said inserted pin protrudes inside said recess
• the tension ring has an outer diameter that is greater than the diameter of the tension ring assembly prior to mounting of said at least one lifting lug to the tension ring, such that the secured tension ring assembly and pipe may not pass back through said through hole, said removable mounting of said at least one lifting lug to the tension ring comprising:
• Figure 8 is a side plan view of the tension ring half, taken along line VIII-VIII of Figure, showing a radially outer surface of the collar segment 6, in which there are four recesses for the clearance holes and two recesses for mounting one of the lifting lugs;
• the tension ring 12 comprises a collar 8 made up of two arc-shaped halves 7, 9, each of which extends substantially around a half circle and which, when assembled into a full collar, also referred to as a "ring assembly", define an axis 2 of the tension ring 12.
• Each collar half 7, 9 has a corresponding collar segment 14, 16 and inside each segment is provided a plurality of wedge- shaped slip segments 20.
• the slip segments are held inside the ring assembly and provide an inner cylindrical gripping face 21 of the tension ring 12.
• the gripping faces are provided by grit-face segments 22 affixed to a main body 23 of each slip segment 20. Such grit face segments are described in more detail in WO/2015/173572 A2.
• the bolts and nuts therefore provide means for tensioning adjacent collar segments against one another to secure the tensioning ring around the pipe.
• the diameter of the tension ring 12 in this example is 1 167 mm.
• the securing bolts 36 may protrude radially by a small amount, for example by about an additional 23 mm as illustrated. However, the bolts may alternatively be fully recessed.
• the hole 4 in a rotary table typically has a diameter of about 1200 mm, and so the tension ring may therefore be lowered downwards through the hole 4 in the rotary table. After connection of the lugs 30, the diameter of the tension ring assembly is 1665 mm.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Mutual Connection Of Rods And Tubes (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=55071091

Family Applications (1)

Country Status (3)

Cited By (2)

Citations (2)

• 2015
  • 2015-12-11 WO PCT/IB2015/059554 patent/WO2016092522A1/en active Application Filing
  • 2015-12-11 DK DK15820625.0T patent/DK3230553T3/en active
  • 2015-12-11 EP EP15820625.0A patent/EP3230553B1/de active Active

Patent Citations (2)

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