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Sodium Carboxymethyl Cellulose (CMC) and Polyionic Cellulose (PAC) in Petroleum Drilling: Applications and Functions
Sodium Carboxymethyl Cellulose (CMC) and Polyionic Cellulose (PAC) are essential additives in petroleum drilling, offering tailored solutions for diverse operational challenges. Below is an English introduction highlighting their applications in different drilling scenarios, suitable for corporate website product descriptions.
Key Properties
CMC is a versatile anionic cellulose ether with excellent thickening, filtration control, and suspension capabilities. It performs reliably in moderate-temperature environments (up to 150°C) and is cost-effective for standard drilling conditions.
• Drilling Fluid Formulation
• Viscosity Enhancement: Improves fluid viscosity to efficiently carry drill cuttings to the surface, preventing blockages.
• Filtration Control: Reduces fluid loss by forming a compact filter cake, stabilizing wellbore walls in porous formations.
• Saltwater Compatibility: Functions effectively in low-to-medium salinity environments without requiring additional preservatives.
• Completion & Fracturing Fluids
• Acts as a viscosity modifier in completion fluids and a cost-efficient alternative to guar gum in low-pressure fracturing operations, enhancing proppant suspension.
• Eco-Friendly: Non-toxic and biodegradable, meeting environmental regulations.
• Cost Savings: Low dosage requirements (e.g., 2.3–5.6 tons per well) and high slurry yield.
Key Properties
PAC is a high-performance derivative of CMC with a higher degree of substitution (0.85–1.4). It excels in harsh conditions, including high salinity, extreme temperatures (150°C+), and high-pressure formations, while requiring 30–60% less dosage than CMC.
• Complex Formation Drilling
• Saltwater & Offshore Drilling: Maintains stability in saturated brine and seawater environments, inhibiting clay swelling and minimizing formation damage.
• High-Temperature/High-Pressure (HTHP) Wells: Provides consistent filtration control and rheological stability in deep wells or geothermal reservoirs.
• Workover & Fracturing Fluids
• Low-Solid Workover Fluids: Reduces formation blockage and water influx, lowering maintenance costs.
• High-Efficiency Fracturing Fluids: Compatible with KCl solutions (up to 2%), rapidly forms gels, and delivers superior proppant transport in low-permeability reservoirs.
• Extreme Adaptability: Suitable for deserts, deep-sea drilling, and ultra-HTHP environments.
• Economic Efficiency: Reduced consumption and long-term cost savings due to enhanced performance stability.
| Application | CMC | PAC |
| Drilling Fluids | Standard onshore wells, moderate salinity | Offshore, high-salinity, HTHP wells |
| Filtration Control | Effective in low-temperature conditions | Superior in high-temperature, high-salt |
| Environmental Needs | Eco-sensitive land operations | Demanding marine/industrial environments |
| Cost Efficiency | Budget-friendly for shallow wells | Long-term savings in complex projects |
Technical Parameters of Petroleum Grade CMC
(Conforms to API Spec. 13A test methods)
| TYPE | Viscometer 600r/min reading | Filtration (ml) | ||
| In distilled water | In 40g/L salt water | Saturated Brine | ||
| LV-CMC | ≤ 90 | ≤10 | ||
| HV-CMC | ≥ 30 | ≥ 30 | ≥ 30 | ≤10 |
(Conforms to API Spec. 13A test methods)
| Type | Apparent Viscosity (mPa.s) | Filtration (ml) | Moisture (%) | Degree of Substitution (D.S) |
| PAC-LV | ≤ 40 | ≤16 | ≤10 | ≥ 0.9 |
| PAC-HV | ≥50 | ≤16 | ≤10 | ≥ 0.9 |
| Type | Viscosity (1%, Brookfield, mPa.s) | Degree of Substitution (D.S) | pH | Purity (%) | Moisture (%) |
| CMC-5000 | 5000-6000 | ≥ 0.8 | 6.5-8.5 | ≥90 | ≤10 |
| CMC-6000 | 6000-7000 | ≤10 | |||
| CMC-7000 | 7000-8000 | ≤10 |
*We can customize according to the client's required specifications.
Q:Is this PAC&CMC suitable for water-based drilling fluids?
A:Yes. The product is specifically designed for water-based drilling mud systems and performs effectively in both freshwater and saltwater environments.
Q: Does it help reduce API fluid loss?
A:Yes. It is widely used for API filtration control and helps minimize fluid loss during drilling operations.
Q:Can it be used in high-salinity mud systems?
A:Yes. The product maintains stable performance in saline environments and shows good contamination tolerance.
