Performance has a complete line of hydraulic chokes, rotating control devices (RCD) and related accessory items. MPD is a ten-year-old technology that keeps drilling pressure at, or slightly above, reservoir pressure, which, it is argued, in most circumstances gives better control of the annular pressure profile throughout the wellbore than under-balanced or over-balanced techniques, where the pressure is maintained below or above that in the reservoir.
A rotating, low pressure sealing device used in drilling operations utilizing air, gas, or foam (or any other drilling fluid whose rcd drilling hydrostatic pressure is less than the formation pressure) to seal around the drill stem above the top of the BOP stack.

Is a multiple broken elevational view of an exemplary embodiment of a floating semi-submersible drilling rig showing a RCD positioned above a BOP stack, a marine riser extending upward from an annular BOP on the surface, a cemented casing and casing shoe in partial cut away section, and a drill string extending through a formation into the wellbore.
When the tool joint has passed through a sealing element and is about to be passed through a second sealing element, the pressures within each cavity may be adjusted again such that the conditions under which the tool joint passed though the first sealing element are replicated for the second sealing element.
Is a cut away section elevational view of an RCD with three passive sealing elements positioned with a unitary housing, sensors for measuring pressures and temperatures in the diverter housing and into and out of the RCD upper and lower internal cavities, upper and lower RCD internal cavity pressure regulators, a mud line to communicate mud to the cavities via their respective regulators and influent and effluent lines for communicating cavity fluid into, in and out of each RCD internal cavity.

Follow the instructions given above for either "Drilling Small Diameter Holes (10mm or Smaller) with Diamond Cores" or "Drilling Small Diameter Holes (10mm or Smaller) with Carbide Bits", depending on whether you are using diamond cores or carbide drill bits.
Communicating a pressured fluid to said second cavity to provide a predetermined fluid pressure to said second cavity to reduce the pressure differential pressure between said predetermined first cavity fluid pressure and said predetermined second cavity fluid pressure on said one of said first and second sealing elements.
Supplying the predetermined fluid cavity pressure in a first cavity defined by the rotating control device inner member, the rotating control device first sealing element and the rotating control device second sealing element when said first sealing element and said second sealing element are sealed on the tubular.

In summary, upon tripping out sacrificial passive stripper rubber sealing elements 592, 594 would experience higher wear and protected passive stripper rubber sealing elements 596, 598 would experience less wear, thereby increasing their wearability for when drilling ahead.
Managed pressure drilling (MPD) recently took a big step into deepwater environments with the installation and utilization of the industry's first rotating control device (RCD) made up below the tension ring and integral to the riser package of a dynamically positioned (DP) drillship.