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SAGD Thermo-hydraulic Well Design

The Industry Challenge:

Steam Assisted Gravity Drainage (SAGD) requires complex well designs and completion configurations to ensure that steam can be delivered efficiently throughout the reservoir interval.

Conventional well completion approaches use multiple injection strings in “toe and heel” configurations to provide multi-point steam injection along the horizontal section of the wellbore.

The flow dynamics of these multi-string completions are extremely complicated due to heat transfer between the injection strings and with the surrounding wellbore which can cause phase changes and flow instabilities in the steam.

Newer well designs use specialized downhole outflow control devices that allow a specified rate of steam to enter the reservoir at selected points along the horizontal section of the well.

Similar inflow control devices can also be deployed on the producing well to limit inflow at specified points in the well to avoid steam channeling from the injector to the producer.

The interactions among the discrete flow control devices in the well can cause pressure transient that can lead to unstable and inefficient steam utilization.

How We Help:

C-FER uses a variety of multi-phase thermo-hydraulic flow models including Q-Flow and custom analytical models to design well completions to efficiently use the injected steam and manage inflow conformance in producing wells.

C-FER has also developed robust transient thermo‑hydraulic models to evaluate start up and shut down conditions in the wellbore. These analyses help operators develop safe operating procedures that optimize steam utilization throughout the well life.

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