In combination a drilling mast and a top drive system for a drilling rig having a drill floor with a well center. The drilling mast has a U-shaped horizontal cross section with a left-hand mast wall, a rear mast wall, and a right-hand mast wall, and with an open front side. Each of the mast walls is provided with one or more vertical rails that are, in use of the drilling rig, parallel to a vertical firing line that extends through the well center. The top drive system comprises a traveling carriage and a top drive unit supported by said carriage. A left-hand fingerboard device is mounted to the left-hand mast wall and a right-hand side fingerboard device is mounted to the right-hand mast wall.

A subsea hydrocarbon production field includes a number of first subsea christmas trees, a first manifold, a number of first flexible flowline jumpers, each of which is connected between the first manifold and a corresponding first tree. Each first flowline jumper includes a first flow conduit and a number of first umbilical lines, and each first flowline jumper includes a first end which is removably connected to a corresponding first tree by a first multibore hub and connector arrangement and a second end which is removably connected to the first manifold by a second multibore hub and connector arrangement.

A subsea hydrocarbon production field includes a number of first subsea christmas trees, a first manifold, a number of first flexible flowline jumpers, each of which is connected between the first manifold and a corresponding first tree. Each first flowline jumper includes a first flow conduit and a number of first umbilical lines, and each first flowline jumper includes a first end which is removably connected to a corresponding first tree by a first multibore hub and connector arrangement and a second end which is removably connected to the first manifold by a second multibore hub and connector arrangement.

A multifunction handler for handling drilling elements in a drilling rig includes a slide, which has a guide system and a lifting system. The slide is adapted to slide along a first axis parallel to the longitudinal extension of a drilling rig mast. An articulated arm, a robotic apparatus, and a handling head are adapted to seize, hold and release a drilling element. The articulated arm is fixed at a first end to the slide. A first end of the robotic apparatus is fixed to the second end of the articulated arm. The articulated arm allows moving the robotic apparatus along a second axis perpendicular to the first axis. The handling head connects to the second end of the robotic apparatus. The robotic apparatus moves the handling head with at least three degrees of freedom and the handler moves the handling head with at least five degrees of freedom.

A multifunction handler for handling drilling elements in a drilling rig includes a slide, which has a guide system and a lifting system. The slide is adapted to slide along a first axis parallel to the longitudinal extension of a drilling rig mast. An articulated arm, a robotic apparatus, and a handling head are adapted to seize, hold and release a drilling element. The articulated arm is fixed at a first end to the slide. A first end of the robotic apparatus is fixed to the second end of the articulated arm. The articulated arm allows moving the robotic apparatus along a second axis perpendicular to the first axis. The handling head connects to the second end of the robotic apparatus. The robotic apparatus moves the handling head with at least three degrees of freedom and the handler moves the handling head with at least five degrees of freedom.

A shaft enlargement arrangement for a boring system is provided, the shaft enlargement arrangement comprising a hollow column proximate a lower end of the boring system; a first cutter head that is rotatably fitted to the hollow column, with first drive means being provided to rotate the first cutter head relative to the hollow column so as to bore downwardly a hole having a diameter corresponding substantially to the diameter of the first cutter head; and a boring head arrangement fitted to an operatively lower end of the column, the boring head arrangement terminating in a second cutter head to bore a leading hole as the boring system proceeds to bore downwardly. In an embodiment, the first cutter head comprises a support body carrying a winged arrangement, the support body being rotatably fitted to the column, the winged arrangement comprising a plurality of wings extending from the support body, each wing being fitted with, or comprising, a plurality of first cutter elements.

Techniques and systems to remove a portion of a drill floor from an offshore vessel. The drill floor may include an immovable section comprising a first portion of a surface area of the drill floor. The drill floor may also include a moveable section comprising a second portion of the surface area of the drill floor. Additionally, the drill floor may include an actuator configured to retract the moveable section from a first position to a second position to remove the second portion of the surface area of the drill floor.

A method for forming a guide for a top drive unit includes connecting a lower track member to a lower mast section and connecting an upper track member to an upper mast section and telescoped with the lower track section. A slider is slidably positioned about the upper track member so the slider is movable along the upper track member. The slider has a lateral cross-sectional profile substantially the same size and shape as a lateral cross-sectional profile of the lower track member. The skate is slidably positioned about the lower track member to be movable along the lower track member and onto the slider. The skate travels along the upper track member via the slider. The skate is connectable to a top drive unit so the top drive unit is movable along the lower track member and the upper track member.

The present invention relates in some embodiments to a bottom supported drilling unit having two drilling stations for independently drilling (or otherwise working on) two wells simultaneously from a cantilever.

A drilling rig may include a detachable, modular cellar arranged beneath a drill floor of the drilling rig. The cellar may be or include a cellar trailer and it may also be configured to house drilling equipment, such as well head equipment and/or one or more blowout preventers. The cellar trailer may provide work areas, such that the well head equipment may be prepared, tested, or generally operated within the cellar trailer. The cellar trailer may additionally be configured to provide stiffening support to the drill floor in order to mitigate deflection of the drill floor during drilling operations. The stiffening support may be provided by a shear wall extending from the cellar trailer. The cellar trailer may be towable. The cellar trailer may additionally be skiddable and/or walkable.