Always OPI’S Representations advise his customer about care and handling of tubular and its tool joint connections, this practice most useful to our customer to reduce the maintenance cost.
Some guidelines are given below
Care and Handling of Tool Joint
Although proper cleaning , inspection ,make-up and handling are always important, the most critical part of a tool joint’s life is the break-in period . newly machined surfaces are more likely to gall. All have been copper plated on threads and shoulders to serve as an anti-galling agent.
After some service, the surfaces undergo changes which make them more resistant to galling. The first few times tool joints are used the following steps are very important.
1. Be sure the Kelly sub is in good condition, it mates with every joint.
2. Be sure thread protectors are in place before picking up drill string members.
3. Thoroughly clean all pin and box threads to remove all grease, dirt, rust preventive coating or other foreign material.
4. Inspect for burrs, dings and wickers on threads and for handling and shipping damage on threads and shoulders, such as scratches, gouges and flat spots.
5. Thoroughly coat the shoulder and threads on both box and pin using API recommended tool joint compound. (The compound should contain 40-50% by weight of finely powdered metallic zinc and not more than 0.3% sulfur.) See also API Std.7,.
6. Make up new joints “Slowly.” High speed rotation during make up may cause galling.
7. Use final make up torque specified for the size and type tool joint in use. See make up chart for refer to API RP 7G or the IADC Drilling manual for torque requirements.
Be sure tongs are in good shape and use a torque measuring device which is in good order.
The general guidelines below will increase tool joint life and there by reduce overall drilling cost.
Drill string members should be equipped with thread protectors when not in active use and when being picked up or laid down. Threads or shoulders should not be allowed to strike steel on the walk or ramp. Unprotected threads can also scrape and pack wood fibers so tightly into the threads that they are very difficult to remove.
Do not use lubricants recommended for tubing and casing, they are “too slick” and can result in stretched and cracked pins. After break-in it is satisfactory to thoroughly dope the box threads and shoulders only.
Do not allow the end of the pin to be stabbed against the box shoulders, this can produce a low spot on the shoulders, which will result in a washout.
Be sure the threads are in alignment before spinning the pipe. The finish torturing accurately with tongs.
When coming out of the hole use both tongs to break out the joint. Keep enough tension on the hook so that when the threads disengage, the pin end will be lifted clear of the box.
Come out of the hole on a different break each trip, this allows frequent inspection of each connection for excessive torque or difficulty that may have begun down-hole.
Make sure the stand back area is clean. Use only tools designed to move joints while they are on the stand. Sharp edged tools can cause shoulder damages and leaks.
When laying down the drill string , wash the tool joints with fresh water apply a rust preventive compound and install thread protectors.
Check drill string for straightness and straighten if needed before reuse.