SAGD - Steam Shut-off
The heavy oil operator wanted to stop steam breakthrough within their SAGD producing wells. In addition they also required the same technology to enhance oil production and total oil recovery.
Provide an Autonomous Inflow Control device to effectively shut off steam within a SAGD Producing wells.
One of the main challenges in Steam Assisted Gravity Drainage (SAGD) wells is steam breakthrough in producer wells, which can result in inefficient bitumen recovery due to high Steam Oil Ratio (SOR). Flow Control Devices (FCDs), also known as Inflow Control Devices (ICDs), have been utilized for many years to balance the oil inflow along the horizontal wells and consequently delay or mitigate the unwanted fluid breakthrough. The newest generation of FCDs is a truly Autonomous Inflow Control Valve (AICV) which can optimize oil production, reduce SOR and significantly restrict the inflow of unwanted fluids such as water, steam and Non-condensable Gases (NCGs). The operator wanted to verify this performance in an old well that was shut-in due to steam locking of the ESP pump.
The AICV technology was installed in a well previously suffering from major steam breakthrough and steam locking of the pump. In December 2006 a retrofit deployment was performed with 20 AICV’s segregated with AICV’s along the horizontal section of the well.
After the retrofit installation of the autonomous inflow control, the steam production was significantly reduced, and the oil production could continue. The well was shut in due to low fluid level and contact with steam along over 50% of the length of the horizontal section. The installation of the AICV enabled the producer to continue production for several more months. The DTS log showed most of the producer at steam chamber conditions while the AICV’s allowed fluid production without steam locking the ESP. The trial proved success in installation without damaging equipment such as sand control or AICV’s, and verified application of the technology.
Contact InflowControl regional office for further details on this application
Comparison of AICV and ICD oil, water and gas production with a 2-bar differential pressure.
Reference page 8, figure 7 of SPE 196216.
Two-phase performance curve of AICV together with single phase tests of AICV and ICD.
Reference page 9, figure 8 of SPE 196216.