Abstract:
Die Erfindung betrifft eine Spannvorrichtung insbesondere zum Spannen von Rohrabschnitten an einem Widerlager, mit einem Zugelement (2) , einem Adapter ( 4) sowie einer Spannvorrichtung zum Aufbringen der Spannkraft und eine Gleitbremse (20), die in Funktionsstellung selbsthemmend lediglich auf Zugbelastung durch den Spannantrieb (24) an dem Zugelement angreift, um ein selbsttätiges Bewegen der Spannvorrichtung in einer Richtung auf dem Zugelement zu ermöglichen.
Abstract:
The invention relates to a telescopic feed beam for a rock drill and to a method of measuring a travel length. The pressure surface of a piston (11b) in a feed cylinder (11) of the feed beam is twice as large as the pressure surface of a piston (6b) in a feed extension cylinder (6). Furthermore, the feed beam comprises a flow indicator (19) for measuring the volume flow rate of hydraulic fluid fed and/or discharged, and thereby the travel length.
Abstract:
The drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite coiled tubing having a fluid impermeable liner, multiple load carrying layers, and a wear layer. Multiple electrical conductors and data transmission conductors may be embedded in the load carrying layers for carrying current or transmitting data between the bottom hole assembly and the surface. The bottom hole assembly includes a bit, a gamma ray and inclinometer instrument package, a steerable assembly, an electronics section, a transmission, and a power section for rotating the bit. It may or may not include a propulsion system. The drilling system may be a gravity based drilling system that does include a propulsion system. Various motive means may be provided, such as gravity, to apply weight on the bit.
Abstract:
A load compensator (304) is disclosed for use in connection with a pipe running tool (10). The load compensator (304) includes an outer housing (308) connected to the portion of the pipe running tool (10) that holds the pipe segment. A piston (310) is disposed within the housing (308), and is connected to a top drive system of the pipe running tool (10). The housing (308) is formed with a first port (312) through which pressurized air is delivered inside the housing (308) to drive the piston (310) within the housing (308). A second port (314) is disposed at a selected location on the housing (308), such that when the piston (310) is advanced past the second port (314), pressurized air passes through the port (314), and causes the control circuit (306) to stop delivering air through the first port (312). Once pressurized air no longer flows through the second port (314), the control circuit (306) causes air to be delivered to the first port (312).
Abstract:
A derrick comprises equipment (41) for movement of a pipe line/drill stem (13) or a pipe section (29) axially in the derrick (12), and equipment (65) for turning of same about its longitudinal axis, together with equipment (31) for installing pipe sections (29) in the derrick (12) and withdrawal of pipe sections (29) from the derrick (12). The equipment comprises an aggregate (41) of axially extendible/contractible hydraulic cylinders (42a-42c, 43a-43c, 44a-44c), which are arranged in groups (42, 43, 44) in the aggregate (41) in two or more vertical rows, with an intermediate vertical guide for the pipe line/drill stem (13) or for the pipe section (29). The rows of cylinders are mutually rigidly connected via bridge portions (45', 45'', 45'''), which separately form a fastening for at least one end of a group of cylinders. Each bridge portion is provided with a laterally opening recess (46) for sideways installation/withdrawal of a pipe section (29) in the guide between the rows of cylinders.
Abstract:
The coupling piece comprises a first connection (2) for connection of an upper rotary percussion device (3) and a second connection (4) for connection of a drill tube string (5) provided with an annular drill bit (23). The coupling piece comprises a first chamber (11) and a second chamber (12) separated by a piston (10). The pressure in the first chamber (11) is used to supply a lower percussion device (8) connected to a third connection (6) associated with the coupling piece with driving medium and for feeding the lower percussion device (8) toward a ground (15). The pressure in the second chamber (12) is used to decrease the force between the lower percussion device (8) and the ground (15) when further drill string elements are added to the drill string (7) of which the lower percussion device (8) forms a part.
Abstract:
A method for connecting a first tubular to a second tubular comprises the steps of supporting said first tubular (101) above said second tubular (104) from a pneumatically operable device (111, 112); and displacing said first tubular (101) downwardly towards said second tubular (104) to facilitate the connection thereof, characterized in that said method further comprises the steps of allowing pneumatic fluid to vent from said pneumatically operable device as said first tubular (101) is lowered towards said second tubular (104) and automatically replenishing said pneumatically operable device (111, 112) after release of said first tubular (101). The present invention also provides an apparatus for carrying out a method in accordance with the invention, which apparatus comprises a pneumatically operable device (111, 112; 211, 212) movable between an upper position (127) and a lower position (128), characterized in that said apparatus further comprises means to vent pneumatic fluid from said pneumatically operable device (111, 112) when, in use, a first tubular (101) is urged towards a second tubular (104), and means (108) to automatically replenish said pneumatically operable device (111, 112) after release of said first tubular (101).
Abstract:
An apparatus for a derrick, comprising two or more hydraulic piston/cylinder arrangements (10, 11) for raising and lowering a yoke (8) which travels on guide rails (7) in the derrick itself and a hydraulic system (30) for the operation of piston/cylinder arrangements (10, 11), where the hydraulic system has various modes of operation, normal raising or lowering of the yoke (i), use of the differential area of the piston (21) for rapid lowering or raising of the yoke (8) and, optionally, a combination of these with extra pressure provided from the accumulators (39).
Abstract:
The earth borer has an extended bearer (10) with a runway (11) to guide a main carriage (25). The drive device for the main carriage (25) consists of a piston-cylinder unit (27) extending beneath the runway (11) under the main carriage (25), the cylinder (28) of which is supported on the bearer (10) via a joint (29). The piston rod (30) engages with the front end of the main carriage (25). The piston-cylinder unit (27) projects beyond the rear end of the bearer only slightly or not at all.
Abstract:
The earth borer has an extended bearer (10) with a runway (11) to guide a main carriage (25). The drive device for the main carriage (25) consists of a piston-cylinder unit (27) extending beneath the runway (11) under the main carriage (25), the cylinder (28) of which is supported on the bearer (10) via a joint (29). The piston rod (30) engages with the front end of the main carriage (25). The piston-cylinder unit (27) projects beyond the rear end of the bearer only slightly or not at all.