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The use of drill pipe and matters needing attention-beneficial mine.
Release time:
2023-02-13
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The use of drill pipe and matters needing attention-beneficial mine.
1. According to the torque, push and pull, the minimum allowable radius of curvature, select the appropriate specifications of the drill pipe.
2. Avoid connecting large diameter drill pipes with small diameter drill pipes during construction (I. e. mixed use of large and small drill pipes) to prevent small drill pipes from being broken or deformed due to insufficient strength.
3. When clamping the drill pipe with vise, do not clamp the female buckle part of the female joint to prevent the female buckle from being clamped and deformed.
4. Pay attention to the pre-tightening force should be controlled within 15MPa when installing the drill pipe to prevent difficulty in unloading due to excessive pressure. Avoid baking the joint with fire, reduce the mechanical properties of the joint, (especially the female joint) affect the service life. If the thread connection is not pre-tightened and swings, the threads will become sharp when grinding each other, resulting in ridges on the side, resulting in thread damage and galling. No pre-tightening, the female buckle step is not compressed, which can lead to fatigue fracture of the thread root of the male joint. Under the action of high-pressure liquid flow, the female joint is punctured, resulting in puncture and corrosion, which is easy to cause longitudinal cracking of the female joint.
5. Note that before installing the drill pipe, clean the male and female buckles and apply thread oil (thread oil cannot be replaced by other waste oil or inferior pressure oil) to prevent premature wear or damage of the male and female buckles.
6. Pay attention to clean the water channel hole before installing the drill pipe to prevent debris from blocking the channel and causing pressure suppression of the mud system.
7. Be careful not to forcibly buckle. When fastening, the male buckle can not impact the shoulder and thread of the female buckle, and ensure that the male and female joints are aligned. Ensure the coaxiality of the shackle of the drilling rig and the main shaft of the power head.
8. Pay attention to check the wear of each part of the drill pipe, and find out the reason in time if abnormal wear occurs:
1) Determine whether the drill pipe is scratched by the sharp hard substance in the hole.
2) Determine whether the drill pipe is scratched by the drill guide device.
3) When the drill pipe body is about 1mm deep and has a spiral shape for more than one circle, please use it with caution. Prevent the drill pipe from being broken during construction, causing greater losses.
9. If the drill collar is found to be damaged (staggered buckle, disorderly buckle, serious wear, etc.), it should be replaced in time to avoid damage to the drill pipe thread.
10. Pay attention to hoisting, and avoid impact damage to the public buckle when handling the drill pipe.
11. Pay attention to avoid mixing drill pipes of different buckle types, even if they are not produced by the same manufacturer, do not mix them (because the technical parameters, processing methods, props and mechanical equipment used by different manufacturers of drill pipes are different, the tolerance and close distance of the processed drill pipes must be different); Do not mix drill pipes with too much difference between the old and the new and with too much difference in wear degree to avoid construction risks.
12. It is found that the drill pipe buckle has local small-scale damage (about 1-2 buckles, 10mm long), which should be repaired in time before use.
13. Pay attention to avoid using vise to hold any part of the drill pipe body, so as to avoid the rod body being clamped by slips and reduce the service life of the drill pipe.
14. Use qualified zinc-based rib grease, butter is not suitable for use as thread oil. Thread grease is insufficient, so that the joint shoulder damage to produce high points, easy to make the thread connection "loose" and cause thread damage. Do not use thread grease or use unqualified thread grease, will make the thread surface adhesion, resulting in galling phenomenon.
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