TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractAfter most operators quit using Pin connector, Riser and Diverter for safety reasons, when drilling the tophole section of subsea wells, the use of seawater and sacrificial mud with return to seafloor has to date been the only available practical method.The RMR spread was run through the moon pool on a single derrick rig, and guided and stabilized by a heave compensated guide wire extending to a subsea anchor. Ref. System Schematic, Fig 1. The equipment was engineered and manufactured within an 8month period, and the field trial took place in December 2004.The paper also discusses the fluid system used, the operational benefits and limitations by applying the RMR technology.At the same time as the RMR Demo 2000 project was initiated, AGR was requested to design and build a Riserless Mud Recovery System for BP to be tested on the West Azeri field in The Caspian Sea. During 2004 the AGR Dual Gradient RMR system has been used to successfully drill the unstable 26" tophole using weighted inhibited silicate-based mud at approximate 120 -160 meter water depth (reference 1 and 2). This is a somewhat lighter version, which is suspended over the rig side by a winch and using a hose for the returns. Equipment Specification and EngineeringThe design basis and scope of work was based on the results from the Pre-Engineering phase. Further design detailing was developed with input from Hydro and Statoil, and was verified by the Project Steering Committee. The main design and operating requirements were:• The RMR System to be designed for 450 m water depth. • Offshore test to be performed in 330 m water depth.
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