The steering assembly (20) includes upper (26) and lower (28) tubular housings connected by a universal joint (30). An angle cam is disposed on the end of the lower housing and projects into the upper housing. A plurality of wedge members (90) extend axially from the upper housing and into engagement with the angle cam (80). Drive trains are connected to the wedge members to move the wedge members toward and away from the angle cam so as to pivot the lower housing at the universal joint and change the angle and azimuth of the lower housing with respect to the upper housing. The lower housing is connected to a bearing pack (16) supporting a drill bit (12) such that upon changing the angle and azimuth of the lower housing, the direction of the drilling of the drill bit is also changed. The steering assembly being connected to composite tubing having conductors in the wall thereof for conducting data and commands between the steering assembly and a processor at the surface and for providing power to the steering assembly. Data on the position of the bit is transmitted to a processor which determines the direction of drilling and selectively transmits commands to the steering assembly to change the bend angle and direction of the drilling of the bit.

A method of protecting one or more compensation cylinders for use at a wellbore, comprising:

monitoring a pressure in one or more compensator cylinders during tubular handling operations;

communicating the pressure to a controller;

performing an action when the pressure reaches a predetermined value, wherein the action is initiated by the controller.

The steering assembly includes upper (26) and lower (28) tubular housings connected by a universal joint (30). An angle cam (80) is disposed on the end of the lower housing and projects into the upper housing. A plurality of wedge members (90) extend axially from the upper housing and into engagement with the angle cam. Drive trains (250) are connected to the wedge members to move the wedge members toward and away from the angle cam so as to pivot the lower housing at the universal joint and change the angle and azimuth of the lower housing with respect to the upper housing. The lower housing is connected to a bearing pack (16) supporting a drill bit such that upon changing the angle and azimuth of the lower housing, the direction of the drilling of the drill bit is also changed. The steering assembly being connected to composite tubing having conductors in the wall thereof for conducting data and commands between the steering assembly and a processor at the surface and for providing power to the steering assembly. Data on the position of the bit is transmitted to a processor which determines the direction of drilling and selectively transmits commands to the steering assembly to change the bend angle and direction of the drilling of the bit.

Die Erfindung betrifft ein Bodenbearbeitungsgerät, insbesondere für den Tiefbau, mit einem Schlitten, der relativ zu einer Basis mittels einer Hubzylinderanordnung verschiebbar ist. Diese ist einerseits am Schlitten und andererseits an der Basis angeschlossen und weist zwei entgegengesetzt wirkende Hubzylindereinrichtungen auf. Eine besonders kompakte und stabile Anordnung wird dadurch erreicht, dass die beiden Hubzylindereinrichtungen jeweils mindestens einen Hubzylinder mit Zylindergehäuse aufweisen, welche nebeneinander angeordnet und miteinander fest verbunden sind.

A pipe running tool for use in an oil drilling system and the like comprises a lower drive shaft adapted to engage a drive shaft (28) of a top drive assembly for rotation therewith. The pipe running tool further includes a lower pipe engagement assembly (16) which is driven to rotate by the lower drive shaft, and is designed to releasably engage a pipe segment (11) in such a manner to substantially prevent relative rotation between the two. Thus, when the lower pipe engagement assembly is actuated to securely hold a pipe segment, the top drive assembly may be actuated to rotate the top drive output shaft (28), which causes the lower drive shaft and lower pipe engagement assembly (16) to rotate, which in turn rotates the pipe segment (11).

Vorschubstützeinrichtung für eine zumindest teilweise drehende und/oder schlagende, portable Werkzeugmaschine (1), welche als fluidbetriebener Arbeitszylinder (3) ausgebildet ist, der an einem ersten Ende ein an der Werkzeugmaschine (1) montierbares Montagemittel (7) und an einem zweiten Ende einen Stützfuss (8) aufweist, wobei der Arbeitszylinder (3) über ein manuell an einem händisch dreheinstellbaren Betätigungsteil (9) betätigbaren Steuerventil (10) stetig steuerbar ist, wobei das Betätigungsteil (9) als quer zur Arbeitszylinderachse (A) auskragender, um die Griffachse (B) dreheinstellbarer Handgriff ausgebildet ist, welcher innerhalb eines Verdrehwinkels von 180° den gesamten Steuerbereich des Steuerventils (10) steuerbar umfasst.

An elevator is provided with a bearing for facilitating rotation between the elevator and an item, such as a tubular, held therein. The bearing is located on a compressible member (199) compressible in response to the weight of the item.

An elevator is provided with a bearing for facilitating rotation between the elevator and an item, such as a tubular, held therein. The bearing is located on a compressible member (199) compressible in response to the weight of the item.