CMC-Na Oil Drilling Grade (CMC-HV / CMC-LV)
CAS‑No：9004-32-4
Complies with API‑13A / GB/T 5005 standard for drilling‑fluid additives
1. Product Brief
Oil‑drilling grade Sodium Carboxymethyl Cellulose (CMC‑Na) is high‑purity anionic cellulose ether, specially refined for water‑based drilling mud. Two main grades: CMC‑HV (High Viscosity) and CMC‑LV (Low Viscosity). CMC‑HV provides both viscosity building and fluid‑loss control; CMC‑LV mainly works as fluid‑loss reducer without excessive viscosity increase. It performs in fresh‑water and moderate‑salt drilling systems, used for drilling mud, completion fluid, to stabilize well wall and suspend drill cuttings.
Note: For heavy brine / high‑temperature deep well, PAC (Polyanionic Cellulose) is preferred over regular drilling‑grade CMC.
2. Physichem Properties
| Parameter | Value | Condition |
|---|---|---|
| Appearance | White‑off‑white free‑flowing powder | ‑ |
| Solubility | Soluble in cold & hot water to form viscous colloid; insoluble in ethanol, acetone | 25 ℃ |
| Degree of Substitution (DS) | 0.80‑0.95 | ‑ |
| pH (1 % aqueous solution) | 6.5‑8.5 | 25 ℃ |
| Particle Size | ≥95 % pass 80‑mesh sieve | ‑ |
| Stability | Good thermal stability up to approx. 120℃; moderate salt tolerance; incompatible with heavy‑metal salts | ‑ |
3. Quality Specification (Oil‑Drilling Grade CMC‑HV & CMC‑LV)
| Test Item | CMC‑HV (High Viscosity) | CMC‑LV (Low Viscosity) |
|---|---|---|
| Appearance | White‑off‑white free‑flowing powder | White‑off‑white free‑flowing powder |
| Purity (dry basis) | ≥95.0 % | ≥95.0 % |
| Loss on Drying | ≤10.0 % | ≤10.0 % |
| Degree of Substitution (DS) | 0.80‑0.95 | 0.80‑0.95 |
| pH (1 % solution) | 6.5‑8.5 | 6.5‑8.5 |
| Chloride (NaCl) | ≤1.5 % | ≤1.5 % |
| API Fluid Loss (filtrate volume) | ≤10 mL | ≤10 mL |
| Viscosity (2 % solution, mPa·s, Brookfield @25℃) | 800‑2000 | 50‑200 |
| Starch & starch derivatives | Absent | Absent |
4. Application & Use
CMC‑HV: Viscosifier & fluid‑loss reducer for fresh‑water / low‑salt water‑based drilling mud; improves mud carrying capacity for drill cuttings; for shallow‑medium well drilling.
CMC‑LV: Primary fluid‑loss control agent, minimum viscosity contribution; suitable for high‑density drilling mud and completion fluid.Function: Reduce filtrate invasion into formation, stabilize borehole wall, suspend solid particles.
Not recommended for saturated brine and high‑temperature deep‑well; select PAC‑HV / PAC‑LV for harsh salt‑rich conditions.
5. Packing
‑ Standard: 25 kg PP woven bag with PE inner moisture‑proof liner
‑ Bulk shipment: 500 kg /1000 kg FIBC jumbo big‑bag
‑ Outer marking: Product name, Grade (CMC‑HV / CMC‑LV), CAS No., Batch No., Net/Gross Weight, Made in China.
6. Delivery and Storage
Storage
Store in cool, dry, well‑ventilated warehouse. Keep bags tightly sealed against moisture absorption. Keep away from strong oxidants. Shelf‑life: 24 months under proper dry storage.
Delivery & Transportation
Non‑dangerous goods, no UN number. Protect goods from rain and dampness. Avoid rough handling and package damage. Do not co‑transport with oxidizing materials. Wear dust‑proof mask and goggles during powder handling.Disclaimer: All above data is typical information. Actual values refer to batch‑specific COA and SDS.
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