Continuous Circulation Systems

Enables continuous circulation during the drillpipe connection process for drilling and tripping narrow pressure window wells and providing continuous hole cleaning

Since the introduction of conventional rotary drilling, the process of pumping drilling fluids into the well has been interrupted in order to turn pumps on and off every time a new joint of drillpipe is added to (or removed from) the drillstring. Continuous circulation is the ability to maintain uninterrupted flow of drilling fluid into the well throughout the process of adding drillpipe joints to (or removing these joints from) the drillstring. This process improves the success rate for challenging projects such as wells with narrow pore pressure/fracture gradients, along with high-pressure/high temperature (HP/HT) wells and extended-reach wells.

The e-cd™ and e-cd Plus continuous circulation systems are used in drilling and tripping operations, enabling the pumps to continue running while making connections. This keeps the bottomhole pressure constant during these activities, maintains the same fluid rheology and temperatures, and ensures that the cuttings are kept moving at all times.

ECD Manifold

The e-cd™ system is an Eni patented system used as a standalone system or in conjunction with managed pressure drilling (MPD) operations to enable continuous circulation – the ability to maintain uninterrupted flow of drilling fluid to the well via the drill string during connections while drilling and tripping out of the hole.

e-cd™ Plus System
The e-cd™ Plus system enhances the e-cd process by replacing the manual connection procedure with an automated system that uses a delivery arm or an overhead lift to attach a tool that clamps onto the e-cd sub. Once the tool is attached, a remote station automatically controls all steps of the side-port connection and flow diversion.
e-cd™ System
The e-cd™ system is an Eni-patented process used as a standalone system or in conjunction with managed-pressure-drilling (MPD) operations to enable continuous circulation – which is the ability to maintain uninterrupted flow of drilling fluid to the well via the drillstring during connections while drilling and tripping out of the hole.

 

e-cd

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