Primary cementing defines long‑term well integrity for oil, gas and water‑injection wells. Many field failures stem from mud‑cement cross‑contamination, solid settlement, and poor hole cleaning. Mixed fluids degrade cement bonding, trigger annular channeling and micro‑annulus defects, leading to expensive remedial cementing operations. Selecting properly formulated displacement fluid becomes critical to avoid these avoidable operational risks.
Engineered from blended polymers and performance‑boosting additives, FC‑S50S and FC‑S60S are two powder‑grade cementing additives built to form stable isolation barriers in annulus displacement workflows. When deployed in cementing jobs, this plugging spacer delivers reliable suspension capacity and strong compatibility with water‑based mud systems. It physically keeps drilling fluid separated from cement slurry and prevents harmful cross‑mixing. The product supports density adjustment from 1.0 g/cm³ to 2.2 g/cm³; after 24‑hour static standing, vertical density difference stays below 0.10 g/cm³, effectively mitigating solid settlement under varied downhole conditions.
Two distinct grades cover different thermal well environments to match real‑world project requirements.
FC‑S50S Medium‑Low Temperature Spacer
This brown powder is developed for wells with moderate bottom‑hole temperature. Stable rheology simplifies on‑site mixing and delivers consistent isolation performance for conventional well construction.
- Appearance: Brown powder
- Density: 1.43±0.05 g/cm³
- Funnel Viscosity: 50–200 sec
- Fluid Loss (90°C, 6.9 MPa, 30 min): ＜150 mL
- Reference Mix Formula: 400g fresh water +12g FC‑S50S +2g FC‑D15L +308g barite
FC‑S60S High Temperature Resistant Spacer
Formulated with heat‑resistant polymers, the white or pale‑yellow powder maintains stable suspension and isolation performance in high‑temperature deep wells where ordinary spacer solutions lose functionality.
- Appearance: White or yellowish powder
- Density: 2.35±0.1 g/cm³
- Funnel Viscosity: 50–100 sec
- Fluid Loss (90°C, 6.9 MPa, 30 min): ＜150 mL
- Reference Mix Formula: 400g fresh water +12g FC‑S60S +2g FC‑D15L +308g barite
Core Product Strengths
- Creates a stable isolation layer to stop intermixing between drilling mud and cement slurry
- High suspension capability minimizes solid precipitation and density stratification
- Broad density adjustment range, works well with barite weighting agent for diverse construction demands
- Dual temperature‑specific grades for shallow, medium and high‑temperature deep‑well scenarios
- Excellent compatibility with common cement additives and water‑based drilling fluids
- Straightforward mixing workflow, keeps steady rheology throughout cement displacement
Field Application Values
Field operators widely adopt this system during primary cementing for oil wells, gas wells and water injection wells. It washes residual mud deposits from casing and borehole walls ahead of cement placement, improves cement‑sheath adhesion and lowers risks of micro‑annulus and channeling. Project teams pick FC‑S50S for shallow and medium‑temperature wells, while FC‑S60S serves high‑temperature deep‑well cementing assignments.
