1. Select the appropriate size of drill pipe according to the torque, pushing and pulling force and the minimum allowable radius of curvature of the drilling rig.
2. Avoid connecting large diameter drill pipe to small diameter drill pipe during construction, (i.e. mixing large and small drill pipes) to prevent small drill pipes from being broken or deformed due to insufficient strength. to be broken or deformed.
3. Be careful not to clip the female buckle of the female joint when clamping the drill pipe with a vise to prevent the female buckle from being deformed.
4. When attaching the drill pipe, the preload force of the upper buckle should be controlled within 15MPa to prevent the difficulty of unbuckling due to excessive pressure. Avoid Avoid baking the joint with fire, which will reduce the mechanical properties of the joint (especially the female joint) and affect the service life. Do not preload the threaded joint. If the threads are not pre-tightened, the threads may become sharp at the top of the threads and produce ridges on the sides, which may cause damage to the threads and produce sticky buckles. No pre-tightening. If the female buckle step is not pressed, it may lead to the fatigue fracture of the thread root of the male joint, and the female joint will be pierced under the action of high pressure liquid flow. This can lead to the phenomenon of stabbing corrosion, which can easily lead to the longitudinal cracking of the female joint.
5. Pay attention to clean the male and female buckles before attaching the drill pipe, and smear the buckle oil (the buckle oil cannot be replaced by other waste oil or poor quality pressure oil) to prevent the male and female buckles from being worn or damaged prematurely.
6. Pay attention to clean the waterway hole before installing the drill pipe to prevent debris from blocking the channel and causing the mud system to hold pressure.
7. Pay attention to not forcing the buckle on. When aligning the buckle, the male buckle should not impact the shoulder and thread of the female buckle, and ensure that the male and female joints are centered. Ensure the coaxiality of the unbuckle of the drilling rig and the spindle of the power head.
8. Pay attention to check the wear of all parts of the drill pipe, and find out the causes of abnormal wear in time by.
(1) Determine whether the drill pipe is scratched by sharp and hard materials in the hole
(2) Determine whether the drill pipe is scratched by the drilling rig guiding device.
(3) Use cautiously when the scratch marks on the drill pipe body are about 1mm deep and more than one circle in spiral shape. Prevent the drill The rod will be broken during construction, causing more damage.
9. If you find any damage to the short joint of the drill cuttings (such as wrong buckle, messy buckle, etc.), you should replace them in time to avoid damaging the screw of the drill pipe. pattern.
10. Pay attention to the lifting and handling of the drill pipe to avoid damaging the public buckle by impact.
11. Avoid mixing drill pipes of different buckle types, even if they are not produced by the same manufacturer (because the technical parameters, processing methods, props and mechanical equipment used by each manufacturer are different, the tolerance and close distance of the processed drill pipes must be different); do not mix the old and new drill pipes with too much difference and too much difference in the degree of wear to avoid causing construction hazards.
12. If you find that there is a small local damage (about 1-2 buckles, buckle length 10mm), you should repair it in time and use it again.
13. Pay attention to avoid using a vise to hold any part of the drill pipe body, so as to avoid the rod being caught by the shackle and reduce the service life of the drill pipe.
14. Use qualified zinc-based ribbing grease. Butter is not suitable for use as threaded grease. Insufficient thread grease will cause damage to the shoulder of the joint, resulting in a high point, which will easily make the thread connection “loose” and cause damage to the thread. Not using thread grease or using unqualified If you do not use thread grease or use unqualified thread grease, it will make the surface of the threaded joint stick together and cause the phenomenon of sticky buckle.
Post time: Oct-08-2022