EC-Drill® vs. EC-Drill® Dual MPD – Unpacking the Key Differences for Drilling Success

At first glance, EC-Drill® and EC-Drill® Dual MPD may look like two variations of the same managed pressure drilling (MPD) system. Both are built on Enhanced Drilling’s proven Controlled Mud Level (CML) technology, and both been successfully deployed in deepwater operations. 

But they serve different purposes, and understanding the difference is key when selecting the right system to match well conditions and influx management requirements. 

The EC-Drill® System – Proven CML Technology

EC-Drill® was originally developed to eliminate the flat time associated with MPD and enable drilling in depleted areas.

At its core, EC-Drill® uses a subsea pump module to adjust the fluid level in the riser. This enables direct control of bottom-hole pressure by changing the height of the hydrostatic column without displacing the well.  

This pressure control principle also forms the foundation for what is later referred to as the dual-gradient effect where curved pressure profiles with lower pressures at shallow depths are achieved.

Key Advantages of EC-Drill®:

• Near instant detection of influxes and losses through subsea monitoring.
• No impact from rig heave, ensuring accurate volume control in all conditions.
• Improve and simplifly the well architecture for deepwater wells.
• Enable drilling in depleted formations.
• Avoid flat-time commonly associcated with MPD
  
  

In practice, EC-Drill® has enabled operators to extend field life, reduce cost, and drill in fields that might otherwise have been abandoned. 

Watch webinar: EC-Drill® Controlled Mud Level Technology to learn more. 

Enter EC-Drill® Dual MPD – Combining CML and SBP

While EC-Drill® offers precision and flexibility, it does not cover influx management. That’s where EC-Drill® Dual MPD comes in. 

By adding a Riser Closure Device, the system enables seamless switching between open-riser and closed-riser modes – combining the strengths of both approaches in one integrated package. 

The difference between EC-Drill® and EC-Drill® Dual MPD can be visualized in how the riser is operated — open for CML, or closed for active influx management.


EC-Drill® in open-riser mode:
Bottom-hole pressure is controlled by adjusting the mud level in the riser, creating a dual gradient effect without closing the system.

EC-Drill® Dual MPD in closed-riser mode:
The riser is closed (red section), enabling hhv closed system, influx management, and gas handling in addition to controlled mud level.

CML Mode – Efficient Day-to-Day Operations

• Precise pressure control and real-time adjustments
• Early kick detection via subsea monitoring
• Faster, safer tripping mitigating surge and swab pressures
• High operational efficiency with minimal flat time
  
  

Advanced Influx Management

• Rapid influx suppression for enhanced influx management
• Riser gas handling
• Dynamic testing capabilities, including LOT/FIT and pore pressure testing
  
  

The Benefit: Dual-Mode Flexibility

Operators can drill efficiently in CML mode for normal operations and instantly transition to closed-mode when required, without displacing fluids or adding flat time. 

This design eliminates key limitations of traditional SBP systems: 

• No need for separate tripping mud or cementing mud
• No slow tripping or stripping operations
• Avoids high pressure at the casing shoe
• Fully usable in upper sections with large hole sizes and high ROPs
  
  

Watch webinar: Introducing EC-Drill® Dual MPD to learn more. 

Value Delivered to Operators

The impact of EC-Drill® and EC-Drill® Dual MPD includes reduced flat time, improved safety, and greater well economics. 

Common Benefits with EC-Drill®:

• Reduced number of casing strings: Enabled by the dual-gradient effect.
• Faster tripping: Riser level adjustments mitigate surge and swab, reducing tripping time.
• Improved cementing: Managed Pressure Cementing (MPC) ensures reliable barrier requirements using standard slurries without displacing the well to another fluid density before cementing.
• Higher production: Successful gravel packing in depleted reservoirs has increased production by 20–40% compared to offset wells.
  
  

Added Advantages with EC-Drill® Dual MPD:  

• Influx Management with improved Kick tolerance – particularly important for deepwater operations. Can be performed at all times, even when running casing.
• Dynamic FITs and Pore pressure testing. Enables rapid determination of downhole conditions.
• Riser Gas Handling for added safety.

Together, these advantages give enhanced operational flexibility and improved control in deepwater and complex wells.  

Selecting the Right System

Both EC-Drill® and EC-Drill® Dual MPD are powerful Managed Pressure Drilling solutions — the choice depends on well conditions and influx management requirements:

• EC-Drill® provides a proven, efficient approach to drilling and completing wells in narrow windows.
• EC-Drill® Dual MPD expands capability for deepwater and high-risk wells, adding closed-riser functionality for active influx management and gas handling. 
  
  

In essence, EC-Drill® Dual MPD combines the efficiency of CML with the ability to switch to a closed system – which provides operational flexibility, allowing the system to manage bottom-hole pressure during normal operations and transition to manage an influx when required - enabling safer and more controlled drilling in complex wells.

The choice between the two systems depends on well conditions and influx management requirements, not on system preferences.