company news about What are the precautions for using drill pipe?

When a new drill pipe is used for the first time, it is recommended to loosen the joint twice at the wellhead with a torque slightly lower than the specified value. After confirming that the joint threads and sealing surfaces are intact, apply sufficient thread oil evenly and follow regulations. Torque the fitting threads for subsequent use in the well. This running and buckling operation is conducive to strengthening the surface hardness of the thread, enhancing the anti-napping performance of the thread, and extending the service life of the drill pipe.

When the wellhead is connected to the drill pipe, it is necessary to manually straighten and guide the buckles to prevent the outer joint from impacting the end face or thread of the inner joint and causing damage; then use chain pliers to manually identify the buckles, introduce no less than two buckles, and then follow the regulations Use hydraulic power clamps. Use torque to tighten the drill pipe joint threads (different steel types, specifications, and water hole sizes require different tightening torques, which must be treated with caution).

Before each trip, the drill pipe string must be replaced and unfastened, so that each pair of joints can be hooked up and unfastened in three passes, so that the threads of each joint can be checked in time and adhesion can be reduced. Problems such as buckling, tripping, and puncture occur. At the same time, the positions of the upper and lower drilling tools should be switched regularly to change the stress state of the drilling tools so that the stress of each part of the entire set of drilling tools becomes consistent, thereby increasing the service life of the drilling tools and reducing the early wear and tear of the drilling tools. The occurrence of malfunction accidents. picture

During the drilling process, reasonable rotation speed and bit pressure should be selected based on the formation, well diameter, and configuration of the lower drilling tools to ensure that the drilling tools are in ideal working condition and obtain satisfactory drilling efficiency. When the drill pipe rotation speed reaches the critical speed and the three vibration frequencies of longitudinal, transverse and torsional vibration generated by the drill pipe rotation are consistent with the natural frequency of the drill pipe itself, resonance will be induced and the entire drill string will suffer serious losses in the hole. Stable state, and make it withstand additional fatigue stress, thereby accelerating the fatigue failure of the drilling tool; the greater the drilling pressure, the greater the resistance of the bottom hole drill bit, and it is easy to get stuck. When critical weight on bit is reached, the drill tool will bend, resulting in good deflection and fatigue fracture of the lower tool threads.

When the drill pipe is operated in a corrosive environment, oxygen scavengers and corrosion inhibitors can be added to the drilling fluid; the pH value of the drilling fluid can be increased to above 10; sulfur-resistant drill pipe should be selected; on the premise of meeting the strength requirements, it should be Corresponding measures such as low-grade drill pipe may be selected to reduce the impact of corrosion factors on drilling tools.

When disassembling the drill pipe at the wellhead, the low gear should be used first, and the hook spring should maintain a certain tension to ensure that there is no pressure between the threaded surfaces of the two joints. After the joint threads are completely disengaged, the hook lifts up to prevent the threads from being pulled, and also prevents the upper drill pipe from impacting and colliding with the wellhead female joint under the action of the spring force.