Performance has a complete line of hydraulic chokes, rotating control devices (RCD) and related accessory items. Compared to manual systems, the automatic system reduces response times to influxes or losses, minimizes the size of influxes from barrels to gallons, optimizes circulation rates out of the wellbore and increases the speed of the total drilling program.
Is a cut away section elevational view of an RCD with a lower active sealing element and two upper passive sealing elements, sensors for measuring pressures and temperatures from the diverter casing oscillator
housing and into, in and out of the RCD upper and lower internal cavities, and influent and effluent lines for communicating cavity fluid into, in and out of each RCD internal cavity.
The hull is typically a large cylindrical steel tube with a variety of internal compartments that provide buoyancy to support the topside drilling and production equipment with a central annulus (center well) through which all production is accomplished.
First pressure regulator or choke valve 630, second pressure regulator or choke valve 634, and third pressure regulator or choke valve 638 are in fluid communication with each other and the wellbore pressure P1 in the lower end of diverter housing 591 through first regulator line 642 (via influent lines 632A, 636A, 640A) and second regulator line 644.
The pressure within one or more cavities may be adjusted such that the pressure above a sealing element is slightly less than, equal to, or greater than the pressure below the sealing element when the tool joint is being raised through the sealing element.
However, the casing shoe pressure integrity may be less than the formation fracture pressure when drilling offshore, such as in geologically young particulate sediments, through salt domes, whose yielding characteristics challenge the ability to obtain an acceptable casing and casing shoe cement job.
American Petroleum Institute Specification 16RCD (API-16RCD) entitled "Specification for Drill Through Equipment - Rotating Control Devices," First Edition, © February 2005 American Petroleum Institute, proposes standards for safe and functionally interchangeable RCDs.
Based upon information received from sensors (204, 208, 212, 214, 216, 218, 238), PLC 222 may signal first pump 220 to communicate a pressurized fluid to first cavity 198 to provide a predetermined fluid pressure P2 to first cavity 198 to reduce the differential pressure between the fluid wellbore pressure P1 in the diverter housing 206 and the predetermined fluid pressure P2 in first cavity 198 on first sealing element 190.
First pressure regulator or choke valve 412, second pressure regulator or choke valve 424, and third pressure regulator or choke valve 434 are in fluid communication with each other and the wellbore pressure in diverter housing 400 through first regulator line 408 (via influent lines 410A, 428A, 436A) and second regulator line 407.
Is a cut away section elevational view of an RCD with four passive sealing elements, sensors for measuring pressures and temperatures in the diverter housing and the three RCD internal cavities, three RCD internal cavity pressure regulators and sized ports in the RCD bearing assembly for communicating cavity fluid with each RCD internal cavity.