When the new drill pipe is put into the well for the first time, it is recommended to perform two actual operations of unscrewing and unscrewing the joint in the wellbore with a torque slightly smaller than the standard value. Tighten the oil and tighten the joint threads according to the specified torque, and then enter the well for application. The actual operation of this kind of break-in period is beneficial to strengthen the surface strength of the thread, improve the anti-galling characteristics of the thread, and increase the service life of the drill pipe.
When the wellbore is connected to the drill pipe, it is necessary to manually pull the positive pull button to avoid the impact of the male joint to the inner hole or thread of the female joint, resulting in damage; then use the chain pliers to carry out manual identification button, introduce no less than two buttons, and then use hydraulic power. The pliers tighten the thread of the drill pipe joint according to the specified torque (different steel grades, specifications, water eye sizes, and the necessary tightening torque are also different, and must be careful in many aspects).
Before each entry into the well, the slings must be exchanged for the vertical rod of the drill pipe, so that each pair of joints can obtain an actual operation of the upper sling during the whole process of three trips, so that each joint thread can be inspected immediately. , reduce the occurrence of problems such as sticking, slipping, and puncturing. In addition, the upper and lower parts of the drilling tools should be replaced on time to change the bearing capacity of the drilling tools, so that the bearing capacity of each part of the complete set of drilling tools tends to be consistent. For this reason, the service life of the drilling tools is increased and the initial invalidation of the drilling tools is reduced. occurrence of security incidents.
After the drilling work is carried out, the drilling tools are neatly placed on the drill pipe rack according to different specifications, wall thicknesses, water hole sizes, steel grades, and classification grades. Immediately clean, rinse and dry the inner and outer surfaces of the drill tool, joint threads, and its shoulder surfaces with cold water. Check whether the surface of the drill pipe has cracks and engraved lines, whether the threads are intact, whether the joints are eccentrically worn, whether the shoulder surface is leveled and scratched, and whether the pipe body is bent or bitten. Check whether the inner and outer surfaces of the drill pipe have defects such as corrosion and floating rust. If allowed by the standard, ultrasonic flaw detectors should be carried out on the drill pipe body regularly, and magnetic particle flaw detection should be carried out on the thread position to reduce the probability of invalid safety accidents such as joint thread breakage and drill pipe body puncture. For drilling tools without problems, rub the anti-rust agent on the thread and the shoulder surface, wear a protective wire, and take various protective measures.
The problematic drill pipes should be marked with paint on the spot and stored separately to avoid misuse. And immediately carry out repair and replacement of the existing problem drill pipe to prevent damage to the construction work in the middle and later stages. For long-term outdoor storage of unneeded drill pipes, cover them with waterproof, rain-proof and rainproof cloth, and regularly maintain the corrosion condition of the inner and outer surfaces of the drill pipes, and do a good job in waterproof and anti-corrosion work.
