A-FRAME

A two-legged, metal or wooden support in the form of the letter "A" for hoisting or exerting a vertical pull with block and tackle or block and winch line, the block fastened to the 3pex of the A-frame, Such a frame fixed to move off location before the well is completed. And although the operators of the drilling vessel know the approximate location of the temporarily abandoned well, to be able to reenter the hole without diver assistance, which often is not possible, requires the pinpointing of the location by electronic means.