An exemplary derrick assembly includes a frame, a hydraulic cylinder assembly, a drive assembly, and a hydraulic assembly. The hydraulic cylinder assembly is mounted to the frame, and includes a piston rod, a single-tube cylinder body, and a hydraulic chamber. The piston rod is secured to the frame, and the cylinder body is mounted to the piston rod for reciprocal movement between proximal and distal positions. The hydraulic chamber is defined in part by the piston rod and the cylinder body, and expands and contracts with movement of the cylinder body. The drive assembly is mounted to the cylinder body for movement with the cylinder body. The hydraulic assembly configured to charge hydraulic fluid into and out of the hydraulic chamber to cause the hydraulic chamber to expand and contract, thereby moving the cylinder body and the drive assembly between the proximal position and the distal position.

An exemplary derrick assembly includes a frame, a hydraulic cylinder assembly, a drive assembly, and a hydraulic assembly. The hydraulic cylinder assembly is mounted to the frame, and includes a piston rod, a single-tube cylinder body, and a hydraulic chamber. The piston rod is secured to the frame, and the cylinder body is mounted to the piston rod for reciprocal movement between proximal and distal positions. The hydraulic chamber is defined in part by the piston rod and the cylinder body, and expands and contracts with movement of the cylinder body. The drive assembly is mounted to the cylinder body for movement with the cylinder body. The hydraulic assembly configured to charge hydraulic fluid into and out of the hydraulic chamber to cause the hydraulic chamber to expand and contract, thereby moving the cylinder body and the drive assembly between the proximal position and the distal position.

A pump jack with counterbalance system is provided, including a supporting structure, a linear actuator with a housing and a shaft, a first pulley carried by the shaft, a second pulley fixed above the first pulley, an elongate flexible member, and a weight cared by the shaft. The housing is vertically oriented and mounted to the supporting structure above a ground surface. The shaft has a first end received within the housing and a connection end that extends out of the housing and carries the first pulley and the weight. The linear actuator drives the shaft between extended and retracted positions. The elongate member passes around the pulleys and has a first end fixed relative to the housing and a second end connected to a surface rod, such that reciprocating movement of the shaft causes the surface rod to move vertically and the weight to act as a mechanical counterbalance.

A device and method for installing a pipe into a rotating control device (RCD) head and for removing a pipe out from a RCD head are described. The device includes a body section for receiving and securing a RCD head placed thereon; and a scoping section configured to secure a first end of the pipe, and to push the first end of the pipe into a bore of the RCD head or to pull the first end of the pipe out from bore of the RCD head. The body section is configured to be substantially stationary when the scoping section pushes the first end of the pipe into the bore of the RCD head, or when the scoping section pulls the first end of the pipe out from the bore of the RCD head.

A device and method for installing a pipe into a rotating control device (RCD) head and for removing a pipe out from a RCD head are described. The device includes a body section for receiving and securing a RCD head placed thereon; and a scoping section configured to secure a first end of the pipe, and to push the first end of the pipe into a bore of the RCD head or to pull the first end of the pipe out from bore of the RCD head. The body section is configured to be substantially stationary when the scoping section pushes the first end of the pipe into the bore of the RCD head, or when the scoping section pulls the first end of the pipe out from the bore of the RCD head.

A drilling machine has a hybrid thrust/pull back system. The hybrid thrust/pull-back system includes at least two different types of drive mechanisms that can be operated concurrently or independently depending upon an operating state of the drilling machine

A modular boost system can be added to a jack to enable greater lift capacity of the jack. One example can involve a jack that is positionable at a well surface for moving a tubing string through a wellbore in a subterranean formation. The jack can include a frame and an adjustable plate that is alternately (i) attachable at a stationary location in the frame for fixing the adjustable plate at the stationary location or (ii) detachable from the stationary location in the frame to enable the adjustable plate to vertically move within the frame. A boost cylinder can be removably coupled to the adjustable plate and a base for selectively supplying an additional lift capability to the jack.

A modular boost system can be added to a jack to enable greater lift capacity of the jack. One example can involve a jack that is positionable at a well surface for moving a tubing string through a wellbore in a subterranean formation. The jack can include a frame and an adjustable plate that is alternately (i) attachable at a stationary location in the frame for fixing the adjustable plate at the stationary location or (ii) detachable from the stationary location in the frame to enable the adjustable plate to vertically move within the frame. A boost cylinder can be removably coupled to the adjustable plate and a base for selectively supplying an additional lift capability to the jack.

An integrated snubbing platform is provided that includes a snubbing section including a snubbing jack assembly and a secondary blowout preventer (BOP) connected to the snubbing jack assembly; and a primary BOP section connected directly to the secondary BOP. The integrated snubbing platform is transportable as a single unit and mountable onto a wellhead as a single unit. A method of mounting a snubbing assembly, a secondary BOP unit and a primary BOP stack onto a wellhead is also provided. The method involves first providing an integrated snubbing platform having a snubbing section that includes a snubbing jack assembly and a secondary blowout preventer (BOP) connected to the snubbing jack assembly; and a primary BOP section connected directly to the secondary BOP. The method then involves mounting the integrated snubbing platform onto a wellhead as a single unit.

An integrated snubbing platform is provided that includes a snubbing section including a snubbing jack assembly and a secondary blowout preventer (BOP) connected to the snubbing jack assembly; and a primary BOP section connected directly to the secondary BOP. The integrated snubbing platform is transportable as a single unit and mountable onto a wellhead as a single unit. A method of mounting a snubbing assembly, a secondary BOP unit and a primary BOP stack onto a wellhead is also provided. The method involves first providing an integrated snubbing platform having a snubbing section that includes a snubbing jack assembly and a secondary blowout preventer (BOP) connected to the snubbing jack assembly; and a primary BOP section connected directly to the secondary BOP. The method then involves mounting the integrated snubbing platform onto a wellhead as a single unit.