Crossover Subs
Crossover sub is mainly used in oil, gas and geology drilling process to connect with other drill stem parts. It is connected of upper drilling tools and lower drilling tools. It has well structure and well property. Because of the different connecting components, there are different requirements to crossover subs.
Safety joint
AJ type safety joint is a specialized joint consisting of two parts. This specialized joint protects the drilling stem during drilling, fishing, repairing and testing operations. It is used to handle and manage well bottom accident. During drilling and coring operations, it is connected to the required position of drilling stem to protect the drilling stem without any influence on the normal working of drilling tool.
Lift Sub
A Lift Sub enables the safe, efficient handling of straight OD tubular such as drill collars, shock tools, jars, directional equipment and other tools by using the drill pipe elevators.
Saver Sub
When rods is added to increase the depth of drilling, the loosening of the threads are now performed at the bottom end of the Saver Sub as opposed to the bottom of the Kelly which is the most expensive part of the drill string. This means that the connection between the top end of the Saver sub and Kelly is seldom used, and suffers minimal wear and tear, Whereas the lower connection is used in almost all cases displacing the most wear and tear from the rotary head connection to the much cheaper Saver Sub which is expendable and does not represent a major investment.
Oriented Bent Sub
Oriented bent sub is a major power deflection tool having a fixed angle deviated from the low end thread of the bent sub to the axial line of drill stem, under the application of oriented sub the power drill tool give the bit a constant lateral force to ensure that the bit can cut on the well wall laterally and further drill into a curved well trace.
Wear Sub
SCOTON wear sub consists of a highly wear rubber sleeve, a metal stiffening liner and a sub body. The rubber sleeve is installed in the middle of sub body and some clearance is given to allow sleeve rotate freely. The rubber sleeves are made of rubber mixtures with good wear resistance
