Flow control sub for hydraulic expanding downhole tools

Details Flow control sub for hydraulic expanding downhole tools Flow control sub for hydraulic expanding downhole tools

1994-02-28

1995-02-28

Schoeppel, Roger J.

Wells

Processes

Placing or shifting well part

166239, 166318, E21B 3312

Patent

active

053928628

ABSTRACT:
A hydraulic control sub assembly for actuating hydraulically operated downhole remedial tools, such as section mills or underreamers, is disclosed. The control sub features a drop ball mechanism to terminate the flow of drilling fluid to the hydraulic tool thereby inactivating the tool. The control sub also has a hydraulic rupture disc that permits drilling fluid circulation when tripping the drill pipe. The control sub further contains upwardly directed jet nozzles to enhance fluid flow in the well bore to help clear away debris. A float valve is also incorporated in the control sub to ensure there is no fluid under high pressure trapped in the hydraulic tool that may jam the tool.

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patent: 4967841 (1990-11-01), Murray
patent: 5181569 (1993-01-01), McCoy et al.
patent: 5318118 (1994-06-01), Duell

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