Down hole milling or grinding system

Details Down hole milling or grinding system Down hole milling or grinding system

1977-06-16

1979-03-20

Purser, Ernest R.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 557, 166 65R, 20412946, E21B 2900

Patent

active

041449363

ABSTRACT:
Apparatus is disclosed for milling metal submerged in salt water or within a hole, such as cutting off the upper ends of pipes and casings in a well-drilling operation below the sea floor. A hydraulic motor is suspended in the hole and driven by sea water to rotate an electrical generator and to rotate a cutting tool. The tool includes radially movable, electrically conductive elements which form the cathodes of an electrochemical machining operation for removing metal. The tool elements include abrasive material so that they can mechanically cut through cement.

REFERENCES:
patent: 1358818 (1920-11-01), Bering
patent: 2660240 (1953-11-01), Ringler
patent: 3271288 (1966-09-01), Crawford et al.
patent: 3696014 (1972-10-01), Goodard et al.
patent: 3769194 (1973-10-01), Haggerty

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