Celulozni eter za Vode za zaključevanje

CMC and HEC are the most commonly considered cellulose ethers for completion fluid applications. CMC supports viscosity adjustment and filtration control in selected water-based systems. HEC provides non-ionic thickening with broader salt and electrolyte compatibility, making it particularly useful in brine-based completion fluids.

CMC helps adjust viscosity, support fluid-loss control, improve suspension stability, and maintain fluid consistency in selected water-based completion fluid systems. Its performance is sensitive to salinity and divalent ion concentration, so compatibility with the specific brine system must be confirmed through testing.

HEC supports viscosity control, smooth rheology, and fluid consistency in compatible water-based and brine-based completion fluids. Its non-ionic character provides broader tolerance for salts and divalent ions compared to CMC, making it a preferred choice in many brine-based systems including calcium chloride and calcium bromide fluids.

Selected cellulose ether grades — particularly HEC — may be used in brine-based completion fluids, but compatibility must be confirmed through testing with the specific brine type, density, ion composition, temperature, and full additive package. Not all grades are suitable for high-density or divalent-ion-containing brines.

Yes. Cellulose ether can help increase fluid viscosity and suspension behavior, which may support the carrying capacity for gravel, sand, bridging materials, or functional additives in gravel-pack, cleanout, and workover operations. Final carrying capacity depends on the complete fluid rheology, particle size and density, flow rate, and wellbore geometry.

A common reference dosage range is approximately 0.1%–1.2% by fluid volume, depending on base fluid type, brine composition, viscosity target, fluid-loss target, temperature, and cellulose ether grade. Gravel-pack carrier fluids and specialty systems may require higher dosages. Final dosage must be confirmed through laboratory testing.

Viscosity loss in completion fluids after aging may be caused by elevated temperature, high salinity, pH changes, divalent ion effects, shear degradation, additive incompatibility, insufficient polymer concentration, or an unsuitable grade for the specific brine and temperature conditions. Grade selection should include hot-rolling aging evaluation under representative conditions.

Start by defining the base fluid type, brine composition, target density, temperature range, pH, viscosity target, fluid-loss requirement, formation compatibility needs, and the full additive package. LANDERCOLL can recommend suitable CMC, HEC, or selected cellulose ether grades for your specific completion fluid system and arrange samples for laboratory evaluation.