How to use drill pipe and matters needing attention
Published:
2020-11-12
1. According to the drilling rig's torque, push-pull force, and the minimum allowable radius of curvature, select a drill rod of appropriate specifications and models.
1. According to the drilling rig's torque, push-pull force, and the minimum allowable radius of curvature, select a drill rod of appropriate specifications and models.
2. Avoid connecting large-diameter drill pipes with small-diameter drill pipes during construction, (that is, 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 a vise, do not clamp the female buckle part of the female connector to prevent the female buckle from being deformed.
4. Note that when installing the drill pipe, the make-up pre-tightening force should be controlled within 15 MPa to prevent the difficulty of unloading due to excessive pressure. Avoid using fire-roasting joints to reduce the mechanical properties of the joints (especially the female joints) affect the service life. Without pre-tightening, the thread connection swings, causing the threads to grind to each other and the crest becomes sharp, and the side surface produces ridges, which leads to thread damage and hooking. Without pre-tightening, the step of the female buckle is not compressed, which can cause the thread root of the male connector to break due to fatigue. Under the action of the high-pressure liquid flow, the female connector is pierced and puncture occurs, which easily causes the female connector to longitudinally crack.
5. Note that before attaching the drill pipe, clean the male and female buckles, and apply threaded oil (the threaded 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 cleaning the water channel hole before installing the drill pipe to prevent debris from blocking the channel and causing the mud system to hold back pressure.
7. Be careful not to force a deduction. When buckling, the male buckle should not impact the shoulder and thread of the female buckle, and the male and female joints should be aligned to ensure the coaxiality of the unloader 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. If there is abnormal wear, find out the cause in time:
1) Determine whether the drill pipe is scratched by the sharp hard material in the hole.
2) Determine whether the drill pipe is scratched by the drill guide device.
3) Please use caution when the scratch marks on the body of the drill rod are about 1mm deep and have a spiral shape or more. Prevent the drill rod from being broken during construction, causing greater losses.
9. Pay attention to the short-connect buckle-type damage of the drill collar (wrong mouth, random 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 damaging the male buckle by impact when handling the drill pipe.
11. Pay attention to avoid mixing drill rods of different buckle types. Do not mix drill rods even if they are not produced by the same manufacturer (because of the differences in the technical parameters, processing methods, props and mechanical equipment of the drill rods manufactured by each manufacturer, the tolerances of the drill rods processed , Tight distance, etc. must be different); the old and new are too different, and the drill pipes with too much wear and tear should not be mixed to avoid construction hazards.
12. It is found that the drill pipe buckle type has a local small area (about 1-2 buckles, buckle length 10mm) damage, and it should be repaired in time before use.
13. Be careful not to use a vise to hold any part of the drill rod body to avoid the rod body from being pinched and reduce the service life of the drill rod.
14. Use qualified thread grease. Butter is not suitable for threading oil. Insufficient thread grease will cause damage to the shoulder of the joint to produce high points, which will easily "loose" the threaded connection and cause the thread to be damaged. Do not use thread grease or use unqualified thread grease, which will cause the surface of the thread to stick and cause sticking.
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