Drilling pipes are manufactured by the extrusion of PVC-U and are then pinned directly on the production line. The ends of the pipes are fitted with external thread at the unpinned end, and with inner thread at the pinned end. The thread is trapezoidal and the thread’s pitch and height provide necessary resistance in connection. The pipes are manufactured with jack without thread, the joint in this case being achieved by bonding with special PVC adhesive.