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Drilling granule CMC is a modified cellulose derivative prepared by a special granulation process. It is in the form of regular spherical particles (particle size 0.3–1.2mm) and has a bulk density of 0.6–0.8g/cm³. Its 2% aqueous solution has an apparent viscosity range of 10–6000mPa·s and a molecular substitution degree (DS) of 0.7–1.0. This controlled DS range ensures stable hydration and predictable rheology, which are essential for consistent drilling fluid performance.

Drilling granule CMC has the advantages of rapid solubility, anti-caking and impact resistance, and is particularly suitable for special operating environments such as offshore drilling platforms and desert drilling rigs. In order to improve the working efficiency at oil field, Drilling granule CMC become one item of CMC more and more popular. The low-dust granular form reduces handling loss and improves on-site safety, making it preferred by many mud service companies.

Main Application

1. Drilling granule CMC used in drilling fluid system optimization
- Drilling Granule CMC has a rapid slurry making: In the slurry preparation of offshore drilling platforms, drilling granule CMC can form a uniform colloid within 5-10 minutes through fluidized bed dispersion technology, saving 50% of slurry preparation time compared with powder type.
- Drilling granule CMC has a high-temperature well stability: After drilling granule CMC aging at 120℃ for 24 hours, the viscosity retention rate is ≥85%, which inhibits the hydration and expansion of deep formation shale and reduces the permeability of mud cake by 40%. So the drilling granule CMC could be used in the deep well drilling or high temperature drilling environment.The high DS value (0.7–1.0) contributes to thermal stability by preventing polymer chain degradation, which is an important performance indicator for long-duration high-temperature circulation.
- Drilling granule CMC has a high-density system support: The drilling granule CMC solution could suspend barite in weighted mud with a density of ≥2.0g/cm³, the sedimentation rate is ≤0.5cm/h. So, the granular item CMC could used in the complicated geological environment.
2. Drilling granule CMC used in completion fluid and workover fluid
- Drilling granule CMC used as Solid-free cleaning fluid: drilling granule CMC has excellent compatibility with formate brine to form a low-damage completion fluid with a filtration loss of ≤3ml (API standard).
- Drilling granular CMC used as Temporary plugging: In fractured formations, granular CMC-G and calcium carbonate particles work together to form a temporary plugging layer with a permeability of ≤10mD. To support the drilling workers finish the well drilling smoothly.
3. Drilling granule CMC used in chemical oil flooding
- Drilling granule CMC used in salt-resistant polymer flooding: In a reservoir with a mineralization of 50,000 mg/L, the viscosity retention rate of drilling granule CMC solution is 25% higher than that of powder type, and the swept volume is expanded by 15%, So the drilling granule CMC has a better performance in high salt well, its function is better than most of the PAC HV series or CMC HV series.Its salt tolerance originates from the optimized DS distribution, which enhances chain flexibility and reduces polymer precipitation in high-ion brines - a key advantage in Middle East and Central Asia reservoirs.
- Drilling granule CMC used in profile control system: Granular CMC forms a high-strength gel with a cross-linking agent to block the high-permeability layer and increase the injection pressure by 3-5 MPa. With this, the fluids could significantly improve the oil recovery rate.
4. Drilling granule CMC used in fracturing fluid
- Drilling granule CMC's viscosity enhancement and proppant carrying function: Granular CMC can quickly dissolve to form a high-viscosity solution, enhance the suspension ability of the fracturing fluid for the proppant (such as quartz sand), and ensure the effective extension of the fracture. Its temperature resistance (160°C) and salt resistance are suitable for high-temperature or high-mineralization formations.Compared with conventional guar, CMC-based fracturing fluids show lower residue content, improving fracture conductivity after flowback.
- Drilling granule CMC used as friction reduction and gel breaking control: Drilling granule CMC solution's gelling ability could reduce the flow resistance of the fracturing fluid, also could reduce the pump pressure. Based on the above, the well construction efficiency is greatly improved. Meantime the amount of residue after gel breaking is low (<10%), which reduces the blockage of the formation. This advantage is greatly good for the recovering of the geology.

Application Solutions & Case Examples

High-Temperature Offshore Drilling - Case Example

Challenge: Rapid mud preparation and stability under high temperature and high salinity.
Solution: Use Granular CMC-G at 0.4–0.8% with fluidized bed dispersion; achieved uniform colloid within 7 minutes and viscosity retention ≥85% after 120°C×24h aging. Field feedback: 50% faster mud prep and reduced downtime due to fewer agglomerates.

Fracturing Proppant Suspension - Case Example

Challenge: Ensuring uniform proppant transport at high pumping rates with minimal residue.
Solution: Granular CMC-G (0.3–0.6%) combined with guar; lab tests showed <10% residue after gel breaking and improved proppant suspension stability during pump tests.

Salt-Contaminated Chemical Flooding - Case Example

Challenge: Maintain polymer performance in high mineralization reservoir (50,000 mg/L TDS).
Solution: Granular CMC exhibited 25% higher viscosity retention vs. powder CMC in 50,000 mg/L brine and expanded swept volume by ~15% in core flooding tests.

Advantage

Drilling granule CMC is white or slightly yellow granules. Compared with powdered CMC, its dissolution rate is more controllable and can reduce the problem of agglomeration. Granular form is more stable during transportation and storage, has lower hygroscopicity, and is especially suitable for use in humid or high temperature environments.

Spec.	Granular CMC-G	Powdered CMC-P
Dissolve time (25℃)	≤15 minutes	≥40 minutes
Salt stability	35% NaCl solution	20% NaCl solution
Dust pollution	No dust	Too much dust
Fluidity	Good (Angle of repose 30°)	Poor (Angle of repose 45°)
Transportation loss	≤0.5%	≥3%

Technical Evidence & Performance Data

Technical Evidence & Typical Performance (for buyer evaluation)

Dissolution: Granular CMC-G dissolves to >95% hydration in ≤15 minutes at 25°C with standard mixing; powder CMC typically requires ≥40 minutes.
Thermal Stability: Viscosity retention ≥85% after 120°C × 24 h aging test (2% solution).
Salt Tolerance: Stable performance in 35% NaCl simulated brine (comparison: powder 20% NaCl).
Handling & Logistics: Transportation loss ≤0.5% (granular) vs ≥3% (powder) under standard sea freight conditions.
Testing Standards: Filtration measured per API RP 13A where applicable; other tests per internal QC SOPs. Detailed test methods listed on COA.

Specification

Spec.	Standard
Appearance	White or yellowish powder
Starch	None
Moisture	≤10.0%
DS	0.80-1.0
Filtration loss (API)	As per API standard
Purity	Technical or high purity
pH	7.0～10.0
Viscosity (600r/min reading)	As per customer requirement

Quality Control & Traceability

Raw Material Control: All cellulose raw materials are sourced from audited suppliers and tested for α-cellulose content, moisture, ash and particle uniformity before acceptance.
Production Process Control: Etherification, neutralization and granulation stages are monitored via in-line sensors (temperature, pH, torque). Degree of substitution (DS) is controlled within production tolerance (0.80–1.00 target range).
In-Process Testing: Samples are taken at defined intervals to test viscosity, solubility, and moisture; corrective actions recorded in batch logs.

Finished Product Testing: Each batch is tested for DS, 2% solution viscosity range, API filtration loss (where applicable), moisture, pH and particle size distribution. A Certificate of Analysis (COA) is issued for every lot.
Pre-Shipment QA: Random re-testing and visual inspection; packaging photos and test summaries can be shared on request. Retention samples kept for 24 months for traceability.
Third-Party Verification: Independent third-party testing (e.g., SGS/BV) is available upon buyer request for large or strategic orders.

Why Choose Our Drilling Granule CMC?

Specialized Product: Granular format designed for rapid hydration and low dust - ideal for offshore and extreme environments.

Proven Performance: Lab and field tests supporting fast dissolution, high temp and salt resistance.

Full Documentation: COA, MSDS, TDS and batch trace records accompany shipments.

Flexible Supply: Small samples (200–500 g) to tonnage contracts; export packaging and logistics support.

Technical Support: Mud recipe optimization and on-site trial assistance available for larger projects.

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Packing & Storage

Storage:

1. Granular Carboxymethyl cellulose should store in a cool, dry, clean, ventilated environment. Temperature Max. 70℃, with relative humidity ≤80%.

Storage:

2. The CMC for pharmaceutical and food grade should not be put together with the toxic substance and harmful substance or substance with peculiar smell during transportation and storage.

Storage:

3. Since the date of production, a preservation period of high temperature resistance sodium CMC should not exceed 4 years for the industrial product and 2 years for the CMC in pharmaceutical and food industry.

Storage:

4. The ultra-high temperature resistance CMC should be prevented from water and package bag damaging during transportation.

Packing:

25kg kraft paper bag with PE inner, or as clients request.

PAC-R

Summary

At present, drilling granule CMC is mainly used in special scenarios such as offshore drilling platforms and polar drilling rigs due to its fast dissolution rate, high temperature resistance and good salt resistance. The future technical development direction of granular cellulose for oil fields includes:

1. Intelligent response particles: the outer layer of drilling granule CMC is wrapped with pH response materials, and the filter loss reducer is automatically released when encountering acidic formations;

2. Nano-coating modification: SiO₂ nanoparticles are loaded on the surface of drilling granule CMC to improve the temperature resistance to 150℃;

3. Biodegradable: Starch is used as a granulation binder, and the COD of waste mud is reduced by 30%.

FAQ

Q1: Can I request a sample and COA before ordering?
A: Yes - we provide 200–500 g samples with COA for lab evaluation. Third-party testing is available for larger orders.

Q2: What is a typical dosage for drilling and fracturing?
A: For drilling fluids: 0.2–0.8% depending on system; for fracturing proppant suspension: 0.3–0.6%. Exact dosage depends on mud formulation and field conditions - we provide dosage optimization support.

Q3: Do you support export packaging and customs documentation?
A: Yes - we provide packing list, commercial invoice, COA, MSDS, and can assist with FCL/LCL logistics.

Q4: How do you ensure batch-to-batch consistency?
A: Each batch has a COA and production record; retention samples are held and in-process controls ensure DS and viscosity target ranges.

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