Overview

Reduce risk and increase productivity with cesium formate

Very clear reservoir image logs in cesium formate brine

Cesium formate brine is high-density, low-viscosity clear brine that makes the ideal non-damaging reservoir drilling fluid. This unique brine enhances the economics and safety of HPHT gas field developments by:

Reducing well delivery time

Reducing HPHT well completion times by an average of 30 days and eliminating the need for well stimulation or intervention.

Enabling recovery of gas/condensate reserves in the shortest time

Enabling high-angle HPHT well constructions that can be completed in open-hole with sand screens for maximum production rates and recovery efficiency. Several HPHT gas fields drilled and completed with cesium formate brine show 90% recovery of reserves within eight years.

Providing improved well security and safety

Improving HPHT well security and safety by:

□Eliminating barite and its sagging problems
□Virtually eliminating gas diffusion problems in high-angle wells
□Creating lower ECD and swab/surge pressures
□Inhibiting hydrate formation
□Rapid surface detection of any gas influx from kicks or well swabs
□Reducing fluid-handling hazards
□Minimising environmental risk

Cesium formate fluids have achieved a record 350-plus drilling days in high-angle HPHT gas wells without a single well control incident.

Improving reservoir evaluation

Very reliable and consistent net reservoir definition is provided by LWD bulk-density and resistivity measurements made in HPHT wells drilled with cesium formate. The highly conductive fluid environment facilitates generation of high-quality resistivity image logs (FMI). These provide detailed reservoir information, including structural dip, depositional environment, sedimentary features, facies and geological correlations.

Stuck pipe pill

Aside from its use as an HPHT drill-in fluid, cesium formate brine also has an interesting niche application as a fast-acting liquid pill for releasing drill pipes differentially stuck in OBM filter cakes. Laboratory tests show that cesium formate brine pills can rapidly destroy OBM filter cakes and aid pipe release.