Precautions before running
DRILL PIPE into the well:
Before the drill pipe is used in the well, the internal thread joint shall be placed on the movable drill pipe stand 0.3m above the ground according to the specifications, and sufficient support shall be provided in the direction of the drill floor to prevent corrosion of the drill pipe caused by water, tide and soil. The drill pipe frame should be kept parallel and at the same level to prevent the drill pipe from bending and deformation; The drill pipe at both ends of the pipe frame should be clamped with plugs to prevent the drill pipe from rolling and falling.
Before the drill pipe goes on the drill floor, the joint thread and shoulder sealing surface of the drill pipe should be thoroughly cleaned and checked. After confirming that the joint is in good condition, it can be used in the well. Wear a protective wire (steel protective wire is recommended) to prevent collision and damage between the thread and shoulder surface during the hoisting process.
When the drill pipe is hoisted along the slide rail on the drill floor, the winch should maintain uniform speed as far as possible. When the drill pipe leaves the slide, a soft rope should be used for manual blocking to prevent collision.
Clean and check the joint thread and shoulder sealing surface before working with single wellhead joint. After confirming that there is no problem, apply special thread oil for oil drilling tools containing 60% fine metal lead powder or 40-60% fine metal zinc powder on the joint thread and shoulder sealing surface (the joint thread in the hole and shoulder sealing surface should also be fully and evenly coated with special thread oil). Prevent sand and other foreign matters from mixing with thread oil, affecting the performance of thread protection oil or scratching thread and shoulder sealing surface.
Precautions for using drill pipe:
When the new drill pipe is used for the first time, it is recommended to unscrew the joint at the wellhead twice, with the unscrewing torque slightly below the specified value. After confirming that the joint thread and sealing surface are in good condition, apply a uniform amount of thread oil, tighten the joint thread according to the specified torque, and then use it in the well. The operation of the opening and closing button is beneficial to strengthen the surface hardness of the thread, enhance the anti-bonding performance of the thread, and extend the service life of the drill pipe.
When docking the drill pipe at the wellhead, it should be pierced manually to prevent the male connector from impacting the female connector end face or thread and causing damage; Chain tongs are then used to manually identify the threads. After introducing at least two threads, use hydraulic power pliers to tighten the drill pipe joint thread according to the specified torque (different types of steel, specifications, water hole size need different tightening torque, must be treated differently).
Before each trip, the drill string is replaced and the shackle is removed so that each pair of joints can be removed once in each of the three trips to check the thread condition of each joint in a timely manner to reduce problems such as sticking, tripping, and leakage. At the same time, the position of the upper and lower drilling tools should be changed regularly to change the stress state of the drilling tools, so that the stress of all parts of the whole drilling tools tends to be consistent, so as to improve the service life of the drilling tools and reduce the occurrence of early failure accidents.
When drilling, a reasonable speed and weight on bit should be selected according to the formation, well diameter and BHA configuration to ensure that the drill tool is in an ideal working condition and achieve satisfactory drilling efficiency. When the rotational speed of drill pipe reaches the critical speed, the longitudinal, transverse and torsional vibration frequencies generated by the rotation of drill pipe coincide with the natural frequency of drill pipe itself, which will cause resonance, make the whole drill string in a serious instability state, and make it bear additional fatigue stress, so as to accelerate the fatigue failure of drill pipe. The greater the weight of the bit, the greater the resistance to the bottom hole bit, easy to cause stuck. When increased drilling weight exceeds the critical drilling weight of the drill tool, the drill tool will bend, causing inclination and fatigue fracture of the BHA thread.
When the drill pipe is operating in a corrosive environment, deoxidizer and corrosion inhibitor can be added to the drilling fluid; Increase the PH value of drilling fluid to more than 10; Use sulfur-resistant drill pipe; Use drill pipe with internal coating; On the premise of meeting the strength requirements, try to use low steel grade drill pipe and other relevant measures to reduce the impact of corrosion factors on the drill.
When removing the drill pipe thread at the wellhead, the low speed gear should be used first, and the hook spring should maintain a certain tension to ensure that there is no pressure between the thread surface of the two joints. After the joint thread is completely disconnected, the hook is lifted to prevent the thread from being pulled up and also to prevent the upper drill pipe from bumping and colliding with the wellhead female joint under the action of spring force.
Maintenance management of drill pipe after use:
After the drilling operation is completed, the drilling tools shall be neatly placed on the drill pipe rack according to different specifications, wall thickness, water hole size, steel type and grading. Clean, rinse and dry the inside and outside surface, joint thread and shoulder sealing surface with clean water. Check the drill pipe surface for cracks and nicks, thread integrity, eccentric wear of joints, flat shoulder surface without scratches, bending and squeezing bite of pipe body, corrosion, pitting and other defects on the inside and outside of the drill pipe. If conditions permit, the drill pipe body should be carried out ultrasonic inspection from time to time, and magnetic particle inspection should be carried out on the thread, so as to reduce the probability of joint thread breakage and drill pipe body leakage. For no problem drilling tools, the thread and shoulder sealing surface should be coated with anti-rust oil, wear protective wire, and take various protective measures.
Faulty drill pipe should be painted on site and stored separately to prevent misuse. Timely maintenance and replacement of drill pipe problems to avoid affecting later construction. The drill pipe that is not used in the open air for a long time should be covered with waterproof tarpaulin, and the corrosion of the inside and outside surface of the drill pipe should be checked regularly to do a good job of moisture-proof and anticorrosive work.
ESASTSUN OILFIELD EQUIPMENT MANUFACTURING (CAMBODIA) CO., LTD