Taper Tap Procedure

1) Plan this operation taking into account the following factors:

  • The size of the taper tool should be selected in order to engage the fish with the middle of the tapered point.
  • The taper taps do not allow free passage to the back-off tool.
  • Excessive torque can damage the tapered thread and swell the top of the fish.
  • It is nigh impossible to release the tool once engaged. For this reason its use has to be considered the last resort and only used after consultation with Eni-Agip Shore Base (Drilling Manager/Superintendent).
  1. Run the fishing assembly, complete with safety joint, space out as required and make up the Kelly.
  2. Lower the catching tool to just above the fish and circulate a few minutes to clean the top of the fish. Do not circulate excessively as this may enlarge the hole.
  3. To engage the fish, apply right hand torque. A gradual increase of back torque is an indication of successful operation.
  4. Chain or spin the pipe out of hole with the fish.

ENI S.p.A. Agip Division

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