Halliburton Company

Daniel A Newman

Paul David Ringgenberg

Harold Kent Beck

Gary D Zunkel

Donald W Winslow

Michael E McMahan

A slip joint for use in a well string and having a removable torque transmitting key. The slip joint includes an outer female mandrel having a central opening therethrough in which is slidingly positioned a male mandrel, also defining a central opening therethrough. In one embodiment, the male mandrel defines at least one longitudinal slot therein and the female mandrel defines a transverse opening therethrough adjacent the slot. The torque transmitting key is positioned in the transverse opening and extends into the slot. In the second embodiment, the inner mandrel includes a flat surface thereon and the outer mandrel has a longitudinal slot therein adjacent the flat surface. The key includes a ring portion having a flat surface therein engageable with a flat surface on the male mandrel and a lug portion extending from the ring portion into the slot. Preferably, the slip joint also includes a bearing portion for radially positioning the inner mandrel and the outer mandrel and for guidance during axial movement therebetween. The bearing portion includes an annular sleeve bearing between the mandrels. In one embodiment, the key also includes a bearing surface in contact with the longitudinal slot for additional guidance between the mandrels.

Round mandrel slip joint

An annulus pressure responsive downhole tool includes a housing with an operating element disposed in the housing. The operating element is movable from a first element position to a second element position relative to the housing. A hydrostatic well annulus pressure referenced annulus pressure responsive first power piston is disposed in the housing and movable from a first to a second position thereof relative to the housing in response to an increase in well annulus pressure. A lower than hydrostatic well annulus pressure referenced annulus pressure responsive second power piston is disposed in the housing and is operatively associated with the operating element for permitting the operating element to move from its first element position to its second element position in response to movement of the second power piston from a first position to a second position thereof relative to the housing. A prevention device is operatively associated with the first and second power pistons for preventing the second power piston from moving to its second position until the first power piston has moved at least part way towards its second position.

Growing community of inventors

Duncan, OK, United States of America

Daniel A Newman