Abstract: A rotation unit for a torque tong for making and/or breaking threaded connections between pipes and/or spinning pipes during screwing and/or unscrewing of pipes, primarily pipes used in petroleum production. The unit comprises a fixed part (41) and a rotary part (40) arranged to grip a pipe (70) to be rotated. The rotary part (40) comprises at least one movable gripping jaw (1, 2, 3) arranged to be moved into engagement with the pipe. The rotary part (40) comprises toothing (43) arranged to engage at least one chain (46, 47), which chain is operatively connected to an actuator (51) in order to move the chain and so impart rotary movement to the rotary part (40).

Abstract: A device for handling pipes or stands including a transportation carriage for transport of pipes or stands between a pipe storage and a place for use. The carriage includes picking columns, each having a first picking arm arranged to move substantially vertically. The arms are capable of lifting at least one horizontal pipe or stand from the pipe storage. The picking columns are also equipped with a respective second picking arm, capable of motion substantially vertically on the opposite side of the picking column, to hold the pipe or stand between the first and second picking arms. Also described are a storage device and a pipe erecting device to be used together with the transportation carriage.

Abstract: The invention concerns a device for application of dope on male threads, comprising a swivel motor (3), the swivel motor operating a rotatable top (6), on said top at least one dope application nozzle (7) being arranged. The dope application nozzle (7) is arranged at a distance from the rotational axis of the top (6), said distance being larger than the radius of a thread section to be doped.

Abstract: A mounting apparatus for a piston-cylinder arrangement (10,11) in a derrick (1) placed on a drill floor (2), which hydraulic piston-cylinder arrangement (10,11) is adapted to raise and lower a yoke (8) which travels on guide rails (7) in the derrick (1) itself, where the cylinder (20) is firmly held by a mounting apparatus (31) in relation to the drill floor (2). For the changing of gaskets (27) on the piston (21) and the cylinder (20), the cylinder is arranged so as to be lowerable in relation to the mounting thereof. The mounting apparatus (31) is designed to be releasable and comprises a flange (32) permanently mounted on the cylinder (20), a fixing device (37) in fixed position in relation to drill floor (2), a dividable locking ring (34), and a locking device (32) and the fixing device (37) and being firmly held in engagement with the aid of the locking device (38). A method of changing gaskets on a piston and cylinder is also described.

Abstract: A slide joint for a riser between a well and a floating petroleum installation such as an oil platform includes an outer pipe and an inner pipe which are adapted to move telescopically relative to one another to compensate for changes in the distance between the sea bed and the platform. The inner pipe is connected to a piston, which piston is responsive to actuation by hydraulic pressure in order to provide tractive force on the riser. The outer diameter of the inner pipe is adapted to the diameter of the outer pipe so as to form an annulus between the pipes. The piston is fixedly connected to the inner pipe at or near the downward oriented end thereof, said annulus above the piston being subjected to hydraulic pressure. Below the piston is provided a protective sleeve, which is slidably disposed within the outer pipe.

Abstract: Disclosed is an apparatus for a derrick, including hydraulic piston/cylinder arrangements for raising and lowering a yoke travelling on guide rails attached to the derrick. A hydraulic system having different modes of operation is provided for the operation of the piston/cylinder arrangements. The hydraulic system can operate in a normal mode for raising or lowering the yoke and in other modes by interconnecting upper and lower chambers of the piston/cylinder arrangements and utilizing a differential surface area of the piston exposed to the two chambers for rapidly raising or lowering the yoke.

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 (1) itself, where two or more wire lines (13) are strung over sheaves (12) rotatably attached to the yoke. The wire lines (13) are attached at one end thereof to the top drive (9) and at the other end thereof are secured to an attachment point (14a, 14b) adjacent to a drill floor (2), said two or more wire lines being run in two sets (13a, 13b) of lines. The attachment points (14a, 14b) for each wire set are connected to a tension equalizer assembly to equalize differences in tension in the wire lines.

Abstract: A hydraulically-operated hoist is disclosed. The hoist includes a plurality of hydraulic piston/cylinder arrangements, each having an upper end. Two guide rails are disposed in parallel with the hydraulic piston/cylinder arrangements. A self-aligning yoke is connected between the upper ends of the hydraulic piston/cylinder arrangements and is raised and lowered along the two guide rails by the hydraulic piston/cylinder arrangements. The yoke comprises a beam with the two ends. An arm is connected to each end of the beam, extends obliquely upward from the beam, and terminates in a remote end rotatably connected to the upper ends of the hydraulic piston/cylinder arrangements. At least two sheaves are rotatably connected to the beam, each of which are capable of running its own wire line.

Abstract: A brake for a hoisting apparatus including a hoisting line, a drum for the hoisting line, a hoisting motor and a brake system for braking of the hoisting cable, the brake system consisting of a hydraulic brake and a mechanical brake. The mechanical and the hydraulic brakes are connected to a common transmission which is driven by the drum when this rotates freely, and the mechanical and the hydraulic brakes are controlled by a common controller for controlling the distribution of braking power between the two brakes. The control system distributes the braking power automatically between the brake systems. The transmission can also be connected to an autodriller for controlling the weight on the bit.

Abstract: A method and device for detecting full magnetization of an electro-permanent magnet which includes at least one permanent magnet part and at least one coil. Current is passed through the coil over a certain period of time in order to magnetize the electro-permanent magnet. The current through the coil of the magnet is measured during magnetization, and an increase of the derivative of the current curve is detected. A signal is given to an operator or computer if an increase in the current derivative is detected, which indicates full magnetization of the electro-permanent magnet.

Abstract: A torque wrench comprises a split casing which can be divided to receive and grip pipes, each casing half comprising jaws which are synchronously movable to center and frictionally engage the pipe joints. The wrench has a split inner annulus which is mounted in and connected to a split intermediate annulus which is rotatably mounted in the split casing. The inner annulus is provided with at least two activable and displaceable clamping jaws in use, temporary and external transfer of a controlled torque is provided to the intermediate annulus. The torque is, in turn, transferred to the inner annulus by the aid of a connection, preferably in the form of pump cylinders, which at the same time activate and provide the displaceable clamping jaws with the necessary power. With a spinning motor, the wrench forms a combined spinning and torque wrench. With a back-up wrench, and mounted on a carriage the wrench assembly forms a complete roughneck.

Abstract: A pipe handling apparatus is disclosed, which is adapted for automated drilling operations. Drill pipes are manipulated between substantially horizontal and vertical positions, and the apparatus is used with a top mounted drilling device which is rotatable about a substantially horizontal axis. The apparatus comprises a strongback provided with clamps to hold and manipulate pipes. The strongback is at one end portion rotatably connected to the same axis as the drilling device. The strongback moves up or down with the drilling device. A brace unit is attached to the strongback to be rotatable about a second axis spaced apart from said first axis. The brace unit has one end portion rotatable about a third axis.

Abstract: A well drilling apparatus of the type suspended from a travelling block in a derrick for movement upwardly and downwardly with a drill string. The apparatus includes an upper nonrotatable unit comprising a drive meter for rotation of a hollow drive shaft connectable to the drill string. The apparatus further includes a lower unit or pipe handler apparatus, the lower unit being rotatable relative to the upper unit, preferably by a motor. The apparatus also includes a swivel transferring compressed air and/or hydraulic fluid from the upper non-rotatable unit to the lower rotatable unit.

Abstract: A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft is coupled, having a threaded end which is adapted for connection to a complementary threaded end on the drill string, and wherein a clamping/lifting means known as an elevator is suspended below the rotary device by two hanger struts. The shaft connected to the rotary device is telescopic. Outside the shaft a lifting means is provided for the lower part of the telescopic shaft. The two hanger struts which carry the elevator for one end of the pipe are means of a sliding holder known as a link hanger. The link hanger is axially movable by means of hydraulic cylinders.The lifting means for the lower part of the telescopic shaft consists of hydraulic cylinders which are constructed as a unit together with the hydraulic cylinders, the cylinders constituting piston rods for the hydraulic cylinders.

Abstract: A pipe handling assembly in connection with an oil derrick comprises two pivotable and vertically movable arms having a grab head in the form of a U-shaped claw intended for transporting a stand of pipe, a drill collar or the like from the well center to a rack, and vice versa. The grab head on one arm, preferably the lower arm, is subdivided vertically into a lower U-shaped member fixedly connected to the arm via a housing and an upper U-shaped member rotatably relative to the lower member and provided with locking means for retaining the pipe, drill collar or the like. The two members are provided with rotation means intended to bring the upper, rotatable member from an arbitrary angular position into a locked position in which its claw aperture is in alignment with the claw aperture of the lower member.