Insertion of a packoff into a wellhead

A method for the insertion of a pack-off into a recess in a bore of a wellhead body, comprising the steps of:

• (a) disposing an activating sleeve for engagement with the pack-off for the movement of the pack-off into the recess, the activating sleeve having body portions shaped for location on a datum member within the bore and including a plurality of slots circumferentially spaced about the activating sleeve;
• (b) running into the bore a tool which is adapted to move said activating sleeve into engagement with the packoff and carries a plurality of resiliently loaded dogs each disposed to be located in a respective one of the slots;
• and
• (c) releasing the dogs from the slots when the activating sleeve reaches a datum position that requires the correct insertion of the packoff in the recess.

An assembly for the insertion of a pack-off in a recess in a bore of a wellhead body, comprising:

• an outer sleeve supporting the packoff;
• an activating sleeve which has portions for engagement with the pack-off and the outer sleeve, the activating sleeve including a plurality of circumferentially spaced and axially extending slots;
• and
• a plurality of detent members located in the outer sleeve and each extending into a respective slot in the activating sleeve.