Preparation of diamond drill bit before drilling 1. Check the previous diamond drill bit for any damage, tooth loss, etc., and ensure that the bottom of the well is clean and free of debris. 2. Carefully handle the diamond drill bit and place it on a rubber pad or wooden board. It is prohibited to place diamond drill bits directly on iron plates. 3. Check if the cutting teeth of the diamond drill bit are damaged, if there are foreign objects inside the diamond drill bit, and if there are O-ring seals in the nozzle hole. Install the nozzle as needed. Diamond drill bit buckle 1. Clean the male or female threads of the diamond drill bit and apply thread oil. 2. Clamp the shackle onto the diamond drill bit and lower the drill string to make contact with the male or female buckle. 3. Place the diamond drill bit and shackle together into the rotary table bushing, and then tighten the screw thread according to the recommended torque value. Drilling down 1. Lower the diamond drill bit slowly, especially through the rotary table, blowout preventer, and casing hanger, to protect the cutting teeth. 2. Pay attention to the blocked well section that occurred during the last trip. When encountering shrinkage and dog legs during the trip, the drill bit should be allowed to pass slowly. 3. Start rotating at a drilling speed of 50-60rpm and start the pump to flush the bottom of the well with a rated displacement when a single pipe is about 1 from the bottom of the well. 4. Pay attention to the weight indicator and torque to ensure that the diamond drill bit contacts the bottom of the well smoothly. Diamond drill bit drilling 1. It is not recommended to use diamond drill bits for drilling well sections. 2. If it is necessary to perform eye scratching, it should be done slowly and with low torque at the rated displacement. Diamond drill bit design 1. Maintain the rated displacement and lower the diamond drill bit to the bottom of the well. 2. Use slow drilling of at least 1m to establish a bottomhole model. 3. Increase the drilling pressure by 10kN each time to the optimal value for normal drilling. It is strictly prohibited to apply too much pressure, which may cause early damage to the diamond drill bit. 4. Maintain constant drilling pressure and adjust drilling speed to obtain the best combination of drilling parameters. Diamond bit drilling normally 1. When encountering strong abrasiveness or hard sand and mudstone, reduce the drilling speed to extend the lifespan of diamond drill bits. 2. Adjust the drilling speed and diamond bit to maintain optimal drilling efficiency when encountering changes in the formation or interlayer. 3. Pay attention to the following points every time you receive a single piece: 3.1 Restore the pump stroke and check the riser pressure. 3.2 Start the pump before the diamond bit contacts the bottom of the well, and slowly lower the diamond bit to the bottom of the well at a drilling speed of 50-60rpm. 3.3 Slowly restore pressure to the original diamond drill bit, and then increase the drilling speed to the original drilling speed.
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