Is among the largest rotary drilling tools used in the petroleum industry. These massive bits are essential for drilling the uppermost sections of oil and gas wells, particularly during the spudding phase, where large-diameter holes are required to set conductor casings and establish well foundations.

Key Features of a 36-Inch Tricone Drill Bit
Design: Comprises three rotating cones, each embedded with cutting elements (either tungsten carbide inserts or steel teeth), allowing efficient rock fragmentation.
Applications: Ideal for drilling through soft to medium-hard formations, such as unconsolidated sediments, clays, and soft shales.
Bearings: Equipped with sealed roller or journal bearings to handle high loads and ensure durability during drilling operations.
Circulation: Features jet nozzles that facilitate the removal of cuttings by circulating drilling fluid through the bit.

Technical Specifications
Size: 36 inches (914 mm) in diameter.
Weight: Can exceed 2,000 kg, depending on design and materials.
Connection: Typically features a 7 5/8″ API Reg pin connection.
IADC Codes: Commonly falls under codes like 111 or 117, indicating suitability for soft formations.

Usage in Drilling Operations
In regions like Iraq and the Kurdistan area, where surface formations often consist of soft sediments, 36-inch tricone bits are employed to drill the initial hole section. This allows for the installation of large-diameter conductor casings, providing structural integrity and isolating shallow water zones.