STAGEL NT Non-Treated Bentonite, 1 MT/BB STASEP Premium Grade Sepiolite Clay, 1 MT/BB

STAGEL NT Non-Treated Bentonite, 1 MT/BB STASEP Premium Grade Sepiolite Clay, 1 MT/BB STAPAC R API Grade Regular PAC Polymer, 25 kg/sack STAPAC LV API Grade Low-Viscosity PAC Polymer, 25 kg/sack STACMC HV API Grade Carboxymethyl Cellulose, 25 kg/sack STACMC LV API Grade Low Viscosity Carboxymethyl Cellulose, 25 kg/sack STAZAN D Easily Dispersible Xanthan Gum, 25 kg/sack STAZAN D+ Extra Low-Shear Rheology Xanthan Gum, 25 kg/sack STAZAN L Liquid Xanthan Gum, 55 gal/drum STAGUM Premium Grade Guar Gum, 25 kg/sack STAHEC Nonionic Hydroxyethylcelulose Polymer, 25 kg/sack STAVIS HT Modified Polymer for Extra High Temperature, 25 kg/sack

STAPAC R API Grade Regular PAC Polymer, 25 kg/sack STAPAC LV API Grade Low-Viscosity PAC Polymer, 25 kg/sack STA-SP Sodium Polyacrylate/HT Filtration Control Polymer, 25 kg/sack STACMC HV API Grade Carboxymethyl Cellulose, 25 kg/sack STACMC LV API Grade Low Viscosity Carboxymethyl Cellulose, 25 kg/sack STATHIN Chrome Free Lignosulfonate, 25 kg/sack STALOSE Filtration Control Polymer, Starch, 25 kg/sack STARESIN High Temperature Filtration Control Polymer, 25 kg/sack

STAMAG High Temperature Alkalinity Control, 25 kg/sack STASEP Premium Grade Sepiolite Clay, 1 MT/BB STALOSE HT HT Filtration Control Polymer, Modified Starch, 25 kg/sack STAVIS HT Modified Polymer for Extra High Temperature, 25 kg/sack STATHIN HT Acrylic Copolymer for High Temperature, 25 kg/pail STATHIN HTS Powder Acrylic Copolymer for HT, 25 kg/sack STARESIN High Temperature Filtration Control Polymer, 25 kg/sack

STATHIN Chrome Free Lignosulfonate, 25 kg/sack STATHIN HT Acrylic Copolymer for High Temperature, 19 lt/pail STATHIN HTS Powder Acrylic Copolymer for HT, 25 kg/sack STARESIN L Resinated Lignite, 19 lt/pail STASAPP Sodium Acid Pyroposphate, 25 kg/sack

STAEASE S Powder Form Lubricant & Shale Stability, 25 kg/sack STACAP Encapsulating Polymer/Shale Stability, 25 kg/sack STACAP LV Encapsulating Polymer/Shale Stability LSRV, 25 kg/sack STACAP L Liquid Encapsulating Polymer/Shale Stability, 19 lt/pail STAB-GIL Premium Grade Gilsonite/Shale Stability, 25 kg/sack STAB-ASP Sulfonated Asphalt/Shale Stability, 25 kg/sack STAB-SASP Supreme Sulfonated Asphalt/Shale Stability, 25 kg/sack STAGUARD Shale Inhibitor, 55 gal/drum STAB-ASP K+ Potassium Salt of Sulfonated Asphalt, 25 kg/sack STA-GLIC LC Glycol LC/Shale Stability, 55 gal/drum STA-GLIC MC Glycol MC/Shale Stability, 55 gal/drum STA-GLIC HC Glycol HC/Shale Stability, 55 gal/drum

STAEASE L Liquid Lubricant for Water Based Muds, 55 gal/drum STAEASE S Powder Form Lubricant & Shale Stability, 25 kg/sack STAEASE B Solid Lubricant Spherical Glass or Plastic Beads, 50 lb/sack STANCER ROP Enhancer, 55 gal/drum STAEASE HTHP Liquid Lubricant for HPHT, 55 gal/drum STAEASE EBL Ester Based Liquid Lubricant, 55 gal/drum

STAFREE Spotting Fluid, 55 gal/drum STACLEAN Bit Balling Preventer, 55 gal/drum STACAKE-UP Mud Cake Clean up Solvent, 19 lt/pail STAFOAM L Liquid Foaming Agent, 55 gal/drum STAWET Drilling Detergent, 55 gal/drum STANCER ROP Enhancer, 55 gal/drum STAB-GLIC Glycol/Shale Stability, 55 gal/drum

STANOFOAM Silicon Based Defoamer, 20 l/pail STADEFOAM Alcohol Based Defoamer, 55 gal/drum STANOFOAM P Aluminum Stearate/Powder Defoamer, 25 kg/sack

STABAR API Grade Barite, 1.5 MT/BB STACARB C Coarse Grade Calcium Carbonate, 1 MT/BB STACARB M Medium Grade Calcium Carbonate, 1 MT/BB STACARB F Fine Grade Calcium Carbonate, 1 MT/BB

STASEAL F Mixture of Different Types of LCM, Fine, 25 kg/sack STASEAL M Mixture of Different Types of LCM, Medium, 25 kg/sack STASEAL C Mixture of Different Types of LCM, Coarse, 25 kg/sack STAPLUG F Fine Grade Mica, 25 kg/sack STAPLUG M Medium Grade Mica, 25 kg/sack STAPLUG C Coarse Grade Mica, 25 kg/sack STACARB F Fine Grade Calcium Carbonate, 1 MT/BB STACARB M Medium Grade Calcium Carbonate, 1 MT/BB STACARB C Coarse Grade Calcium Carbonate, 1 MT/BB STACARB 1000 Coarse Grade Calcium Carbonate, 40 kg/scak STACARB 1500 Coarse Grade Calcium Carbonate, 40 kg/scak STAFIBER MIX Mixture of Fiber Materials in Different Grades, 25 kg/sack STAXC PLUG Cross-Link Polymer for Total Loss, 25 lb/sack STASQUZ SEAL Acid-Soluble LCM for Total Loss, 50 lb/sack STANUT Hazelnut Shell, 1 MT/BB STANUT F Fine Hazelnut Shell, 25 kg/sack STANUT M Medium Hazelnut Shell, 25 kg/sack STANUT C Coarse Hazelnut Shell, 25 kg/sack STANUT P Peanut Shell, 1 MT/BB STASEED C Coarse Apricot Seed, 1 MT/BB STASEED XC Extra Coarse Apricot Seed, 1 MT/BB

STAANTIOX Sulfite-Based Oxygen Scavenger, 55 gal/drum STAOXSCAV Bisulfite-Based Oxygen Scavenger, 55 gal/drum STAANTISULF H2S Scavenger/Powder Zinc Carbonate, 25 kg/sack STASULFOSCAV H2S Scavenger/Triazine-Based, 55 gal/drum STASAFE WS Fim Forming Amine-Based Corrosion Inhibitor, 55 gal/drum STASAFE O OS&WD Film Forming Amine-Based Corrosion Inhibitor, 55 gal/drum STASAFE B Corrosion Inhibitor for Brine, 55 gal/drum

STACIDE Aldehide Based Biocide, 19 lt/pail STATRICIDE Triazine Based Biocide, 19 lt/pail STACIDE A Amin Based Biocide, 19 lt/pail

CAUSTIC SODA pH Buffer, 25 kg/sack CAUSTIC POTASH Potassium Based pH Buffer, 25 kg/sack SODA ASH Calcium Hardness Control, 25 kg/sack SODIUM BICARBONATE Calcium Hardness Control, 25 kg/sack CITRIC ACID Alkalinity and pH Control, 25 kg/sack LIME Calcium Buffer, 25 kg/sack GYPSUM Calcium Buffer, 25 kg/sack

SODIUM CHLORIDE Salt, 1 MT/BB POTASSIUM CHLORIDE Salt, 1 MT/BB CALCIUM CHLORIDE Salt, 1 MT/BB

STA-O PEMUL Primary Emulsifier DBM, 55 gal/drum STA-O SEMUL Secondary Emulsifier DBM, 55 gal/drum STA-O PEMUL S Primary Emulsifier SBM, 55 gal/drum STA-O SEMUL S Secondary Emulsifier SBM, 55 gal/drum STA-O PEMUL HT Primary Emulsifier SBM&DBM HT, 55 gal/drum STA-O WET Oil Wetting Agent, 55 gal/drum STA-O GIL Premium Grade Gilsonite for OBM, 25 kg/sack STA-O ASP Liquid Sulfonated Asphalt for OBM, 25 kg/sack STA-O THIN Thinner for OBM, 55 gal/drum STA-O THIN HTHP Thinner for OBM for HTHP, 55 gal/drum STA-O MOD Organic Liquid Gelling Agent for OBM, 55 gal/drum STA-O THIK Liquid Viscosifier for OBM, 55 gal/drum STA-O THIK ULTRA High Performance Liquid Viscosifier for OBM, 55 gal/drum STA-O GEL A Organophilic Clay for SBM, 25 kg/sack STA-O GEL P Premium Grade Organophilic Clay, 25 kg/sack STA-O SOLV High Performance Wellbore Cleaner, 55 gal/drum