Nearly all drilling pipes are threaded, from 2'; core samplers to what you see used in the oilfields. When you need to pull the pipe to replace a bit, the sections need to be undone.How to joint the pipe when drilling oil and gas ?
Further to the previous answer. The threads are tapered and have an ACME like profile so they are strong in their ability to handle large torque loads as well as in shear from the weight of the drill pipe that might be hanging below.
Some drill strings can be several miles long.How to joint the pipe when drilling oil and gas ?
The threaded portion of the drillpipe is called the Tool Joint.
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