FC-611S is a polymer fluid-loss additive for oil-well cement, built on an AMPS/NN copolymer backbone with non-hydrolyzable groups. Where ordinary polymers start losing grip at high temperature, the non-hydrolyzable chemistry keeps the additive effective - which is why FC-611S carries a 230 °C (BHCT) rating.

Along the chain sit dense −CONH₂, −SO₃H and −COOH adsorptive groups. They bind free water, build a tight low-permeability filter cake and pull fluid loss down - while also giving the product genuine salt tolerance in fresh-water and salt-water slurries alike.

What sets FC-611S apart from a standard high-temperature fluid-loss additive is rheology. It develops a high low-shear-rate viscosity, so cement grains and solid additives stay suspended instead of settling. The slurry keeps its homogeneity and density through the job - even at high temperature or high solid loading - while remaining fluid enough to mix and pump without trouble.

Model: FC-611S

Max temperature: ≤230 °C (BHCT)

Slurry systems: fresh / salt water

Key trait: suspension stability, anti-settling

Retarding: none

Early strength: fast, incl. low temperature

Field-proven in Middle East cementing

• Stable at 230 °C

Non-hydrolyzable groups keep fluid-loss control working in deep and ultra-deep wells, where bottom-hole temperatures push ordinary additives past their limit.

• Suspension that fights settling

High low-shear-rate viscosity holds cement and solids in place. No sag, no density segregation - the slurry stays uniform all the way downhole.

• Salt-tolerant by design

Works in fresh-water and salt-water slurry systems, including high-salinity formations and seawater-based designs offshore.

• No retarding, fast early strength

Won't stretch thickening time, and early compressive strength develops quickly - including at low temperature - so the schedule stays on track.

• Clean slurry behavior

Low free water, stable rheology, easy mixing on location. The system stays predictable from mix water through displacement.

• Plays well with others

Compatible with a wide range of cementing additives - dispersants, retarders, defoamers - so it drops into an existing slurry design with minimal rework.

Physical and chemical index per product-batch testing. Every batch is lab-tested before shipment; the latest test certificate and recommended dosage for your cement grade are provided on request.

• Deep & ultra-deep wells

HPHT cementing where BHCT approaches 200–230 °C and fluid-loss control must not fade with depth.

• High-salinity & offshore

Salt-water and seawater slurries, brine formations and marine projects that punish ordinary polymers.

• High-solids & lightweight slurries

Systems prone to settling - micro-cement, high solid content, low-density slurries that need extra suspension.

• Long seal sections

Jobs where the slurry must stay homogeneous across a long column, from pumping to set.

20+ years of oilfield additive manufacturing

50,000+ tonnes annual production capacity

20+ engineers in R&D and quality control

100% batches lab-inspected before shipment

Raw materials and finished goods are checked in our laboratory against each order's specification. Production runs out of Cangzhou Lingang Chemical Industrial Park, Hebei - a certified high-tech manufacturing base serving global oil & gas projects.

Q: What temperature is FC-611S rated for?

A: Up to 230 °C (BHCT). The polymer uses non-hydrolyzable groups so fluid-loss control holds up in hot wells where standard additives degrade.

Q: Can FC-611S be used in salt water?

A: Yes. It is designed for fresh-water and salt-water slurries, and shows good salt resistance - suited to high-salinity formations and seawater systems.

Q: Does FC-611S retard the slurry or delay strength?

A: No retarding effect. Slurry keeps its schedule, and early compressive strength develops quickly, including at low temperature.

Q: How is FC-611S packaged?

A: Standard packaging is a 25 kg three-in-one composite bag; customized packaging is available on request.

Q: Can you supply lab reports and a recommended dosage?

A: Yes. Send us your cement grade and slurry recipe - our technical team will confirm the recommended dosage and issue batch test reports with your order.

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