CP-982 is an amine-treated organophilic clay formulated as a cost-effective viscosifier and gellant for oil-based drilling fluids. Produced from high-quality sodium bentonite through controlled quaternary ammonium surface treatment, CP-982 develops effective yield point and gel structure in all-oil and invert emulsion systems where sufficient mixing shear is available. Evaluate cutting transport, barite suspension and filtration in the complete mud at the planned operating conditions.
Technical Properties
| Parameter | Specification | Test Method |
|---|
| Chemical composition | Organically modified bentonite clay | — |
| Appearance | Off-white to tan free-flowing powder | Visual |
| Moisture content | ≤ 3.5% | 105°C, 2 hours |
| Particle size | ≥ 95% passing 76 μm (200 mesh) | Sieve analysis |
Drilling Fluid Performance Functions
- Viscosifier and gellant — builds yield point and progressive gel strength for cutting transport and suspension at rest
- Fluid loss control — contributes to filter cake quality and reduces filtrate invasion into permeable formations
- Emulsion stability — supports the stability of invert emulsion (water-in-oil) systems under downhole shear conditions
- Cutting carrying capacity — maintains solids in suspension during circulation, preventing settling that leads to stuck pipe or poor hole cleaning
- Weighting material suspension — prevents barite and other dense weighting agents from sagging in deviated and horizontal well sections
- Temperature evaluation — confirm performance after aging the complete mud at the planned well conditions
Compatible Base Fluids and Applications
| Base Fluid | Fluid Type | Typical Treat Rate |
|---|
| Diesel oil | All-oil, invert emulsion OBM | 5–15 kg/m³ |
| Mineral oil (low-toxicity) | LTOBM, invert emulsion | 5–15 kg/m³ |
| Synthetic base oil (SBF) | SBM for deepwater/offshore | 6–15 kg/m³ |
| Crude oil | Workover, completion fluids | 5–12 kg/m³ |
| Packer fluids | Packer and completion | 3–8 kg/m³ |
| Spotting fluids | Differential sticking relief | 5–10 kg/m³ |
Temperature qualification: Request a grade-specific report and test the complete formulation at the planned temperature, pressure and aging time. Do not treat an indicative range as a universal downhole rating.
Dosage and Rheology Guide
| Target Yield Point (API) | Typical CP-982 Dosage | Mud Weight Range |
|---|
| 5–10 Pa (light OBM) | 5–8 kg/m³ | 1.0–1.4 g/cm³ |
| 10–18 Pa (standard OBM) | 8–12 kg/m³ | 1.4–1.8 g/cm³ |
| 15–25 Pa (high-density OBM) | 12–15 kg/m³ | 1.8–2.2 g/cm³ |
Values are indicative for diesel/mineral oil base fluid. Actual dosage depends on base oil type, shear history, temperature, and other additives present. Laboratory optimization recommended before field application.
Incorporation Method
- Add CP-982 to the base oil — add as a dry powder to the base oil before emulsifiers or other additives
- High-shear mixing required — disperse using a high-speed mixer or mud hopper at maximum available shear; CP-982 requires sufficient shear for full exfoliation and gel development
- Mix for minimum 15–20 minutes at high shear to ensure complete dispersion
- Add emulsifiers after CP-982 is fully dispersed
- Add water phase gradually while maintaining high shear to form stable invert emulsion
- Check rheology (yield point, gel strength, plastic viscosity) after mixing and before adding weighting material
Frequently Asked Questions
What is CP-982 organoclay used for in drilling fluids?
CP-982 is the primary viscosifier and gellant in oil-based and invert emulsion drilling fluids. It builds yield point and gel strength for cutting transport, suspends barite and other weighting solids when circulation stops, may affect filtration and emulsion stability in the complete formulation. Compatible with diesel, mineral oil, crude oil, and synthetic base fluids. Treat rate 5–15 kg/m³.
Full OBM application guide → What base oils is CP-982 compatible with?
CP-982 is compatible with diesel, crude oil, mineral oil, and synthetic base oil used in invert emulsion drilling systems. Effective in all-oil systems, invert emulsion (OBM), workover fluids, completion fluids, casing packs, packer fluids, and spotting fluids. For HPHT conditions, compare candidate grades in the complete aged mud.
What is the treat rate of CP-982 in oil-based drilling fluid?
Standard treat rate: 5–8 kg/m³ for light YP (5–10 Pa); 8–12 kg/m³ for standard OBM (YP 10–18 Pa); 12–15 kg/m³ for high-density systems (YP 15–25 Pa). Dosage depends on base oil type, mud weight, and target rheology. Contact our technical team with your well program and target rheology for a specific treat schedule.
Packaging and Storage
| Parameter | Specification |
|---|
| Standard packaging | 25 kg kraft paper bags with PE inner liner |
| Shelf life | 2 years from manufacture date |
| Storage conditions | Dry, covered warehouse; protect from moisture and direct sunlight |
Related grades: CP-34 (coatings + drilling dual-use) ·
CP-250A (grease grade)
Related applications: OBM application guide ·
Water-Based Drilling Fluids ·
Viscosity Control in OBM ·
HPHT testing guide
