A Successful Experience For Fiber Optic And Water Shut Off On Horizontal Wells With Slotted Liner Completion In An Extra Heavy Oil Field

摘要

Identifying the water producing section of a horizontal wellcompleted with a slotted liner in Extra Heavy Oil (EHO)proves by itself to be a challenge. Being able to isolate thatsame interval and selectively injecting a water shut offtreatment is even more challenging. To properly isolate theselected section, the annulars (open hole / slotted liner) aboveand below must be sealed; those annular may or may not befilled with formation sand.This paper describes the water shut off experience in theSincor Field in an EHO environment. Initially, the waterproducing interval was identified through the use oftemperature measurements performed with a fiber optic. Thenthe zone to be treated was isolated using cement rings placedin the annulus, combined with the use of cement retainers.Following the isolation of the zone, a gel solution thatpolymerizes in situ followed by a tail slurry of micro-matrixcement were selectively injected. The idea behind thetreatment is to create an impermeable barrier to the unwantedwater production coming from the end of the well. The welltreated had an initial water cut of 85%, and after the treatmentthe water cut was decreased to almost zero and the oilproduction boosted up by a 250%, compared to hydratedproduction period. Additionally, the final well productivityindex (PI) indicates that the treatment effectively treated onlythe selected section.In horizontal wells and EHO environment, the fiber optic toolproved to be a simple and reliable technology to assess thewater production zone along the drain. An associated watershut off operation using cement and gel may then beimplemented to reduce the water cut and to increasesignificantly the oil production rate.