Product Detail Description
Highly Sulfonated Lignite Polymer is an advanced filtration control agent and rheological stabilizer engineered for water-based drilling fluids operating in challenging high-temperature, high-salinity environments. This specially modified highly sulfonated lignite polymer demonstrates exceptional performance in systems containing up to 70,000 ppm chlorides and 3,000 ppm hardness, maintaining functionality under bottomhole temperatures exceeding 400°F (204°C). Unlike conventional lignosulfonates or untreated lignites, this product achieves complete solubility in high-density brines including NaCl, KCl, CaCl₂, and magnesium salt systems, providing reliable HPHT filtration control without increasing fluid viscosity or gel strengths.
The molecular structure of this highly sulfonated lignite polymer features enhanced sulfonation levels that ensure superior electrolyte tolerance and thermal stability. When implemented in alkaline conditions (pH >10.0), it effectively replaces conventional polymers that typically degrade under extreme temperatures. Its mechanism involves adsorption onto clay particles and formation of a compressible, low-permeability filter cake that minimizes fluid invasion into sensitive formations, thereby enhancing wellbore stability and reducing hole washout tendencies.
Applications/Functions
Provides effective HPHT filtration control in water-based fluids with high electrolyte content
Replaces conventional polymers that degrade at elevated temperatures
Enhances wellbore stability and reduces hole washout in sensitive formations
Maintains rheological stability under extreme bottomhole conditions
Advantages
Stable at temperatures exceeding 425°F (218°C)
Does not increase fluid viscosity or gel strengths
Solubilizes readily in alkaline drilling fluids (pH >10.0)
Tolerant to high concentrations of NaCl, KCl, CaCl₂ and magnesium salts
Enhances hole stability through improved filter cake quality
Typical Properties
Appearance: Dark brown powder
Specific Gravity: 1.35
pH (5% aqueous solution): 8.8-9.2
Recommended Treatment
Typical treatment range: 2-8 ppb
Recommended to be pre-solubilized in caustic solution before addition to active system
Optimal performance achieved at fluid pH greater than 10.0
