Preparation work 1. The downhole situation is normal, and the tripping is smooth and unobstructed. 2. The bottom of the well is clean and free from metal debris. 3. The drilling fluid meets the drilling design requirements and the purification equipment operates normally. 4. Use the drill pipe filter well, and its maximum aperture should be smaller than the diameter of the smallest nozzle on the drill bit. Inspect 1. The drill bit model, diameter, and steel stamp markings are consistent with the drill bit manual and outer packaging. 2. The inner and outer cutting teeth (composite pieces) are intact, without broken or missing teeth. 3. The flow channel is unobstructed, and the diameter of the nozzle is checked with a vernier caliper. The nozzle is firmly fixed and meets the hydraulic design requirements. 4. Carefully inspect the wear level, diameter wear degree, and wear characteristics of the inner and outer tooth areas of the old drill bit, analyze the service life, mechanical drilling speed, and desired drilling footage of the drill bit in the formation to be drilled, compare drilling costs and bear risks, and determine whether to re-enter the well.
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