Losh-dril high density cacl₂ saturated reservoir fluid is a high-density water-based drill-in fluid system. formulated with calcium chloride brine as base fluid and blended with other salts, it eliminates clay components entirely. the system is prepared by adding high-molecular polymers and acid-soluble bridging materials. its core components include viscosifiers, rheology modifiers, fluid loss additives, graded calcium carbonate and corrosion inhibitors. the generated filter cake can be easily removed to maximize reservoir protection.
The system features clay-free composition and high shear-thinning property. it effectively prevents borehole collapse and improves rate of penetration. performance remains stable under harsh conditions including high temperature of 180°c and calcium ion concentration up to 15000 mg/l. applicable formations include unconsolidated and fractured sandstone (reduced cacl₂ concentration required), salt-gypsum formations (near-saturated cacl₂ recommended), and other geological environments. field case studies demonstrate core recovery can reach 95%, delivering effective reservoir protection and supporting stable long-term production. when drilling into sub-salt reservoirs, switch to the forcle-dril drill-in fluid system: kcl + polymer + formate.
Highlights of losh-drill:
mixed divalent salt system
high shear-thinning property
good filter cake quality: thin, tough and non-permeable
filter cake easily removable
reservoir-specific system, excellent reservoir protection,
permeability recovery ≥90%
maximum density up to 2.1
low corrosivity
low turbidity: ntu < 40
lower cost vs formate systems, high value
no crystallization under low temperatures, suitable for low-temp drilling
versatile for drill-in, completion and workover fluids (remove caco₃ bridging particles, reduce polymer concentration)
The drilling fluid system formulated with this product is suitable for challenging well conditions such as high-calcium, high-magnesium, saturated brine, and deep-well drilling environments, with temperature resistance up to 400°F and calcium tolerance reaching 10,000 ppm,inhibiting polymer coiling, flocculation, and performance degradation under high-calcium conditions
Core products
LOAH-TRoLCa is a high-temperature resistant and divalent salt-tolerant fluid loss additive synthesized through quaternary copolymerization The LOSH-DRIL system formulated with this product is suitable for challenging well conditions such as high-calcium, high-magnesium, saturated brine, and deep-well drilling environments, with temperature resistance up to 400°F and calcium tolerance reaching 10,000 ppm