PETRA WALNUT SHELL F/M/C is a premium-grade natural lost circulation material (LCM) manufactured from carefully processed walnut shells. Produced by PETRA INDUSTRIES . LTD., this environmentally friendly additive is designed to control fluid losses, strengthen wellbores, and improve drilling performance in various drilling fluid systems. The product is available in Fine, Medium, Coarse, and Mixed grades to suit different formation conditions and loss circulation challenges. Due to its hard, fibrous, chemically inert, and biodegradable nature, PETRA WALNUT SHELL F/M/C provides reliable sealing performance while maintaining compatibility with both water-based and oil- based drilling fluids. In addition to loss circulation control, the product contributes to improved lubricity, helping reduce torque, drag, and bit balling during drilling operations. What is PETRA WALNUT SHELL F/M/C? PETRA WALNUT SHELL F/M/C is a natural granular lost circulation material derived from selected walnut shells that are ground into controlled particle sizes. The product is designed to bridge and seal permeable formations, fractures, and seepage zones where drilling fluid losses occur. Its fibrous and resilient structure allows it to form an effective seal while remaining compatible with various drilling fluid systems. The product is widely used in oil & gas drilling, workover operations, and wellbore strengthening programs.