A mobile rig for use in lowering a string comprising joints of a conduit into a well is provided with a rig transporter comprising a motorized unit, a mast assembly, a pivotal conne
After withdrawing the transfer barge15, the shuttles35bearing the deck1are brought back to a low position bearing against the deck of each barge20(FIG. 8) and the deck1is attached onto the barges20by means of tie-rods or slings50or by means of any other suitable element. ...