Technological challenge:
New Technologies for workover operations: interval sealing and water shut off
DESCRIPTION: Innovative solutions are needed for both permanent and temporary sealing of production intervals, as well as for selective water shutoff. The goal is to ensure, when necessary, effective permanent isolation of intervals that will not return to production, temporary isolation of intervals where production will be resumed, and selective water shutoff in zones with high water cut.
EXPECTED RESULT: Specialty oilfield chemicals and new materials.
CURRENT LIMITATIONS: Applied technologies are limited to reservoirs with strong aquifer. Frequent reperforation of the interval damages the production casing and affects well integrity. Also, over the long period of production, when the interval has to be sealed, great cement slurry losses occur during cementation. Production casing leakage frequently occurs due to long service life at the shallow depths, where conventional cementation technologies do not give good results mostly because of low temperatures.
POTENTIAL SOLUTIONS: Implementation of innovative Specialty oilfield chemicals and new selective materials for water shut off, as well as permanent or temporary solutions for well integrity control and production interval sealing.
