ECDM System November, 2014 Security Classification: Restricted - Status: Draft
Objective • Enhance the ability to safely and efficiently drill deep-water wells − High uncertainty in pore and fracture pressure gradients − Narrow drilling margins • Develop system for bottom-hole pressure control ‒ Avoid loss circulation by controlling bottom hole pressure ‒ Enhanced kick detection ‒ Avoid pressure fluctuation at connections 2 Security Classification: Restricted - Status: Draft 2
Field proven Bottom Hole Pressure control systems Pilot Future DGD – Dual Gradient Drilling MPD – Managed Pressure Drilling Controlled RCD - Rotary Control Device DGD MPD Mud Level Without BOP With BOP RCD w/backpressure Seabed Dilution CML-O CML-U Pumping Liquids Continous Total Controlled Riserless Subsea Mud ECD Annular Microflux Control Mud EC-Drill Mud Return Lift Pumping Pressure Management Pressure Driller Management Enhanced Enhanced Enhanced Enhanced GE/Hydrill Weatherford MPO Transocean Drilling Drilling Drilling Drilling /MPO 3 Security Classification: Restricted - Status: Draft 3
ECD-Management system • ECDM system is a controlled mud level system for controlling bottom hole pressure Mud Return • The dynamic effect on the bottom hole pressure Line (ECD) is reduced by lowering and controlling the fluid level in the riser. Pressure Transducer • A subsea pump module is installed in the riser and returns the drilling fluid back to the rig through a dedicated mud return line • ECDM consist of the following sub systems: − Enhanced Drilling - Mid riser pumping system Riser Isolation DSRM Subsea Pump and control Valves Module − DSRM (Delta Seal Riser Module) MPO − Riser Gas Handler and tie-in to rig fluid system – Maersk • Planned to be installed on the Maersk Developer Q3 2014 4 Security Classification: Restricted - Status: Draft 4
ECD Management - well control • ECDM system will not change well design • Option to continue drilling conventional – isolate ECDM system • All well control will be handled conventionally − ECDM system will be isolated above BOP • Safer than conventional system − Enhanced Kick Detection • Influx/loss detection by change in pump speed • Additional personnel observing well − Limit influx potential • Potential for higher MW than conventional − Limited pressure fluctuation at connection 5 Security Classification: Restricted - Status: Draft 5
Controlled Mud Level managing the downhole pressure ECD Static Dynamic Dynamic mud pressure Depth Pressure ECD 6 2013-10-28 Security Classification: Restricted - Status: Draft
ECDM vs Dual Gradient system ECD Dual Gradient Dual Gradient Management Seabed Static TVD Dynamic Pumping Controlled Mud Seabed pump Level – Mid riser module pumping Gradient Single fluid Dual fluid gradient gradient psi Bottom Hole Reduced riser level Controlled fluid ECD Management Pressure (BHP) controlling BHP interface controlling Seabed Static BHP TVD Dynamic Well Control Conventional well System part of well control. ECDM control system system isolated. psi 7 Security Classification: Restricted - Status: Draft
Controlled Mud Level – TR3534 • The operations are split into two different categories: • a) CML-O operations – the riser fluid level always maintains hydrostatic overbalance • b) CML-U operations – the riser fluid level may not provide hydrostatic overbalance • To determine CML-O vs CML-U: − Minimum fluid level shall be defined based on how low the fluid level can go in a worst case scenario. 8 Security Classification: Restricted - Status: Draft
ECDM – Components Vent Top fill pumps (2) Gas sensor Mud/Gas seperator • One pump runs with constant rate 100 gpm. • Mud is injected to create downwards flow towards MRJ outlet, replace static mud above the outlet and cooling/lubricating the slip joint K/C Manifold Diverter Modified Riser Joint (MRJ) Gas sensor Flowmeter Top fill Pump • With pressure sensors above subsea pump outlet. Pressure Flowline Shaker/Active sensors monitor the riser level MP Gas sensor Line to TT • Double block valves with ROV interface called RIV (Riser Isolation Valve). And double SWI (Sea water inlet valves) Line to Cement Unit Riser Gas Subsea pump module (SPM) Handler • Dry docked to riser - 3 centrifugal pumps in series • Changes in SPM rpm/power indicate kick/loss • Two subsea cameras 1130' MRL Mud Return Line (MRL) • 6.07 inch return line (5.5 inch connections) along riser • Flexible hose from termination joint below gas handler to rig PT DSRM Delta Seal Riser Module (DSRM) By-pass line SPM Upper annular for connection - Riser Drilling Device (RDD) • 150' SIW Without sleeve installed PT RIV 2 Lower Quick Closing Annular (QCA) Open Valve • Closed Valve For underbalance situation RIV 1 • Riser boost Riser Gas Handler PT Utilized for verifying and handling potential gas in riser • BOP 9 Classification: Internal restricted
ECDM System Control Container Office/Tool Container Umbilical winches, MPO and AGR Riser Gas Handler Flexible hose Subsea Pump LARS DSRM for Mud Rerun Module Line 10 Security Classification: Restricted - Status: Draft
Enhanced Drilling Modified Riser Joint (MRJ) Upper pressure sensor N2 injection port Guide pin SPM upper support Mud return line 2 x lower pressure sensors SPM docking plate 2 x Isolation valves Security Classification: Restricted - Status: Draft 11
MPO – Delta Seal Riser Module Security Classification: Restricted - Status: Draft 12
Recommend
More recommend
