Two way earth boring fluid motor

US4051910A · kind A · utility

Inventor

• Wallace Clark · Indianapolis, US

Key dates

• Filing date: Dec 8, 1975
• Grant date: Oct 4, 1977
• Expiry date: Dec 8, 1995

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B4/02
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

There is disclosed a fluid motor composed of a helical gear pair wherein an inner chamber has an external helical thread and a cooperating outer member has one more internal helical thread than the number of external helical threads on the inner member. The outer member is secured to one of the sections of a water swivel which is conventional except that it has an axial intake, radial tube and inner member supporting guide, and means are associated with an end of the inner member and with the other section of the water swivel to prevent relative rotation between said inner and outer members while permitting gyration of the inner member in relation to the outer member. Each end of the device has a tapered female thread. The motor may be used either end up. A drill pipe or suitable sub is threaded into one end of the device and a tool is threaded into the other end of the device, directly or with the sub between. In one embodiment the outer member of the gear pair is held stationary by the drill pipe which is threaded into it or with a sub between, and the tool which is threaded into the other end is rotated by the rotation of the inner member and the rotating part of the water swive…