The method of preventing pressures higher than a predetermined pressure in the front ram seals of blowout preventer rams comprising providing blowout preventer rams suitable for sealing across the bore of a blowout preventer stack, providing seals on the blowout preventer rams which sealingly isolate the bore area below or upstream of the blowout preventer rams from the area above or downstream of the blowout preventer rams, providing a passageway from the front to the rear of the blowout preventer rams to vent the upstream or higher pressures to the rear of the blowout preventer rams, and communicating the resilient seal material in the front ram seals with a pressure release piston which will relieve the pressure at the predetermined pressure.

In a blowout preventer central bore and a central bore axis with an oval ram cavity having a ram cavity axis having one or more horizontal interface portions between the ram cavity and an actuator body, a method of connecting the actuator body to the ram cavity comprising providing one or more locking bar receptacles passing through one or more of the planes of the one or more horizontal interface portions of the ram cavity, providing one or more locking bar receptacles passing through one or more of the planes of the one or more horizontal interface portions of the actuator body, and providing one or more locking bars in one or more of the one or more locking bar receptacles in both the ram cavity and the actuator body.

A blowout preventer includes a housing including a longitudinal passage and a pair of ram passages extending from the longitudinal passage, a first ram assembly disposed in a first of the pair of ram passages and including first ram block assembly, and a second ram assembly disposed in a second of the pair of ram passages and including a second ram block assembly, wherein the first ram block assembly is configured to include a first configuration in which it sealingly engages an outer surface of a tubular member extending through the longitudinal passage of the housing when the blowout preventer is in a closed position, and a second configuration in which it sealingly engages the second ram block assembly when the blowout preventer is in the closed position.

A blowout preventer including a housing including a central passage and a first aperture, and a first ram assembly slidably disposed in the first aperture, wherein the first ram assembly includes a ram block and an actuator configured to rotate the ram block when the ram block is disposed in the first aperture of the housing.

Disclosed herein are various embodiments of an Annular Pressure Control Ram Diverter designed to be positioned below the conventional blowout preventer stack, and which will be activated during near balanced drilling operations to seal the annulus between the drill pipe and the casing. Returned drilling fluid and produced fluids are diverted up the annulus between the casing and intermediate casing and through a well head located below an all-inclusive BOP stack. The Annular Pressure Control Ram Diverter employs hydraulic rams to compress a flexible seal around the drill pipe. Some embodiments have an elliptical internal cavity which ensures that the elliptical seal elements cannot rotate. Other embodiments use ridges and grooves on the seal elements and housing to prevent rotation of the seal elements. Doors are provided on each side of the Annular Pressure Control Ram Diverter to permit changing of the seal elements.

A rod lock out clamp is disclosed. The lock out clamp includes a housing having a central bore for receiving a rod in spaced relation therethrough and clamp members in the housing for grippingly and frictionally engaging the rod in the bore. At least one of the clamp members has an inner end and a recess in the inner end, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius. Manipulating means are coupled to the housing and the clamp members for moving the clamp members between a rod gripping position and a retracted position.

An accumulator system that includes a housing. The housing defines a function chamber and a balance chamber. A piston moves axially within the housing. The piston separates the function chamber from the balance chamber. An electric actuator couples to and drives the piston within the housing to compress and drive a first fluid out of the function chamber.

A head for a well tubular. The well tubular head includes features that may be applied to a casing head or a tubing head. The well tubular head includes a bowl tubular reversibly connected with a casing connector. The bowl tubular is adapted for connecting with an uphole component of an equipment stack or other system. The bowl tubular includes a hanger profile for receiving a casing hanger or tubing hanger. The casing connector is adapted for connecting with the casing. The bowl tubular and the casing connector may be replaced independently of each oth-er. Removable connection points for flow lines may be includ-ed on the well tubular head to facilitate changing flow lines or flow line connection points. The bowl tubular may include a dri-ve system for rotating tubing.

A rotary lock system includes a gear configured to be driven to rotate via an engine. The rotary lock system includes a rotatable starter component configured to engage the gear via an interface. The interface includes a circumferential gap to enable the gear to rotate through an angle before contacting and driving the rotatable starter component.

A piston rod subassembly for use in a blowout preventer operator assembly includes a piston rod having a rod threaded interface and a rod shoulder on an outer diameter of the piston rod. A preload ring has a ring threaded interface for engaging the rod threaded interface to couple the piston rod to the preload ring. A protruding end surface of the piston rod protrudes past an end face of the preload ring when the piston rod is coupled to the preload ring and the rod shoulder engages a ring shoulder of the preload ring. A piston has a pocket for receiving the preload ring. Preload ring fasteners couple the preload ring to the piston to form a piston rod connection between the piston rod and the piston, such that the protruding end surface engages an interior surface of the pocket and a preload is induced in the piston rod connection.