Introduction
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D-POLY™ Series is a DongYU R&D-developed nonionic inverse-emulsion polymer line for water-based drilling fluids (WBM).
Compared with conventional fluid-loss additives, D-POLY™ Series is designed to deliver reliable filtration control in high-temperature / high-salinity environments, including divalent brines (Ca²⁺/Mg²⁺).
The series provides LV (low rheology impact) and HV (viscosity-building) options to balance fluid loss control, pumpability, and hole cleaning. It can also be applied in foam drilling fluid / aerated WBM systems where stable hydraulics and filtration control are required.

Grades & Temperature Rating
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 (Grade number indicates temperature rating.)

• D-POLY 150 LV — up to 150°C; low viscosity build with strong fluid-loss control

• D-POLY 150 HV — up to 150°C; viscosity-building for better carrying capacity

• D-POLY 180 HV — up to 180°C; high-temperature HV grade for demanding HT/HS intervals

Applications / Functions
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• Strong fluid-loss control and improved filter-cake quality

• LV advantage: controls filtration with minimal viscosity build for pumpability and stable hydraulics / low ECD

• HV function: builds viscosity for cuttings transport and hole cleaning

• Designed for high salinity and divalent brines (Ca²⁺/Mg²⁺) (verification recommended for specific brine chemistry)

• Applicable in foam drilling fluids / aerated WBM (confirm compatibility with foaming package)

Advantages
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• Temperature-rated options: 150°C and 180°C grades for different intervals

• High-salinity and divalent-brine tolerance for challenging water chemistries

• Flexible rheology profiles (LV / HV) to match field objectives

• Inverse-emulsion polymer form supports practical field handling and stable performance

Recommended Treatment
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• Typical dosage: 0.5–1.0%.

Package
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• 200 kg plastic drum

• custom options available