In high‑pressure well completion operations, calcium bromide brine is widely preferred over traditional weighted drilling fluids for the following reasons:
- Low solid phase and minimal formation damage
Calcium bromide brine is a solid‑free clean fluid. It avoids pore throat blockage, clay hydration and permanent permeability damage caused by barite and bentonite solids in conventional weighted drilling fluids. - Adjustable density and precise pressure balance
It features a wide adjustable density range to precisely balance high formation pressure. It is compatible with formation water, crude oil and reservoir minerals, with no scaling, precipitation or emulsification. - Strong clay inhibition and wellbore stability
Calcium ions effectively inhibit clay hydration and dispersion, stabilize water‑sensitive formations, prevent wellbore collapse and hole shrinkage in high‑pressure complex reservoirs. - Low friction and high operation safety
Solid‑free brine has low viscosity and flow resistance. It reduces circulating friction and surge pressure, lowering the risk of well kick and blowout during high‑pressure completion. - Easy flowback and guaranteed production capacity
With low fluid loss and low viscosity, calcium bromide brine can be quickly flowed back after completion. No solid residues remain in the reservoir, ensuring maximum oil and gas productivity. - Controllable corrosion and simple post‑processing
With corrosion inhibitors added properly, its corrosion risk is controllable. It is easier for waste liquid treatment and subsequent reservoir reconstruction than traditional weighted drilling fluids.
