Unconsolidated sands plug stand-alone screens
The Russkoe heavy oil field located in the far north of Russia has permeable but extremely unconsolidated reservoir rock prone to sand production. An operator had completed several wells with wire-wrapped, premium mesh, and slotted stand-alone screens of various sizes, but sand tended to plug the screens and lead to collapse of the open hole over time—sometimes in as little as eight hours—and cause oil production to decline sharply. With such an unstable open hole, a new gravel-packing technique was required to maintain stability and production.
Low flow rates and antiswab tools ensured complete gravel pack
The operator decided to evaluate the effectiveness of openhole gravel packing in a shallow horizontal well that had a TVD of 2,963 ft [903 m] and an 83/8-in openhole lateral of approximately 1,148 ft [350 m]. Schlumberger recommended MeshSlot screens due to their high-flow shroud design that allows efficient flow distribution through the sintered mesh filter medium. The AquaPac system was then deployed to carry and place gravel around the MeshSlot screens. This combination of the AquaPac system and MeshSlot screens reduced friction and enabled lightweight gravels to be transported at lower flow rates, which kept the unstable open hole from collapsing.