Abstract: There is a braking assembly for limiting rotation of a drive shaft in a reverse direction. A hub is fixed for rotation with the drive shaft. The hub has an external cylindrical section and at least one hub pocket on the external cylindrical section. An actuatable brake portion is sized and shaped to be mounted for rotation around the hub. The actuatable brake portion has an internal cylindrical section, at least one brake pocket on the internal cylindrical section corresponding with the at least one hub pocket, and at least one brake shoe. The braking assembly also includes at least one ball.

Abstract: A drive head for a wellhead, the drive head comprising: a rod drive; a pressure chamber; and a rod receiving part connected to the rod drive and enclosed within the pressure chamber. A method comprising: pressurizing a chamber mounted to a wellhead, in which the chamber encloses an upper end of a rod extending from the wellhead; and driving the rod using a rod receiving part enclosed within the chamber.

Abstract: There is a braking assembly for limiting rotation of a drive shaft in a reverse direction. A hub is fixed for rotation with the drive shaft. The hub has an external cylindrical section and at least one hub pocket on the external cylindrical section. An actuatable brake portion is sized and shaped to be mounted for rotation around the hub. The actuatable brake portion has an internal cylindrical section, at least one brake pocket on the internal cylindrical section corresponding with the at least one hub pocket, and at least one brake shoe. The braking assembly also includes at least one ball.

Abstract: A stuffing box for a wellhead comprises a stationary housing defining a passage for receiving a well tubular, and a tubular shaft mounted on the stationary housing for rotation within the passage and defining an inner axial bore. The inner axial bore is adapted to form a static seal around the well tubular in use, and a dynamic pressure seal is mounted within an annular cavity defined by respective cylindrical surfaces of the stationary housing and the tubular shaft. One or both of the respective cylindrical surfaces are tapered to decrease the radial cross sectional area of a seal travel portion of the annular cavity in an axial direction from a well end of the stationary housing to an opposite second end of the stationary housing.

Abstract: A drive head for a wellhead, the drive head comprising: a rod drive; a pressure chamber; and a rod receiving part connected to the rod drive and enclosed within the pressure chamber. A method comprising: pressurizing a chamber mounted to a wellhead, in which the chamber encloses an upper end of a rod extending from the wellhead; and driving the rod using a rod receiving part enclosed within the chamber.

Abstract: A stuffing box for a wellhead, the stuffing box comprising: a stationary housing defining a passage for receiving a well tubular; a tubular shaft mounted on the stationary housing for rotation within the passage and defining an inner axial bore adapted to form a static seal around a well tubular in use; and a dynamic pressure seal mounted within an annular cavity defined by respective cylindrical surfaces of the stationary housing and tubular shaft, in which one or both of the respective cylindrical surfaces are tapered to decrease the radial cross sectional area of a seal travel portion of the annular cavity in an axial direction downstream from a well end of the stuffing box.

Abstract: A system comprising a top mounted rotating stuffing box is provided for use with downhole pump (e.g., Progressing Cavity Pump) applications. The system also includes a split standpipe configuration that allows the stuffing box to be quickly installed or removed as needed. The split standpipe feature combined with the top-mounted aspect of the stuffing box allow for the corresponding drive units to stay intact while the stuffing box is being installed or removed.

Abstract: A system comprising a top mounted rotating stuffing box is provided for use with downhole pump (e.g., Progressing Cavity Pump) applications. The system also includes a split standpipe configuration that allows the stuffing box to be quickly installed or removed as needed. The split standpipe feature combined with the top-mounted aspect of the stuffing box allow for the corresponding drive units to stay intact while the stuffing box is being installed or removed.