Oil and gas drilling steel pipe, including drill pipe,
casing and tubing, the special nature of oil and gas exploitation, working conditions extremely complex conditions can be quite harsh, so its very strict quality requirements. Such as tubing in the course of not only bear the weight of the column itself, the need to withstand corrosion oil (gas), water, acids, etc., and thus their shape, size, coupling strength, tightness, mechanical properties and corrosion resistance and so on there are strict requirements. Tubing Coupling by threaded connection tubing, to bear the weight, and thus their higher. The coupling blanks for the manufacture of tubing coupling short pipe coupling tube.
Grade J55 tubing pipe coupling process is as follows:
Tube - blanking - heating - heat-centering - piercing - wear mandrel - necking - jacking - loose stick - stick off (after the mandrel lubrication, before sending necking machine, recycling) - hot saw - reheating - high pressure water descaling - tension reducing - cooling bed Cooling - cold saws - straightening - product testing - packaging and storage.
High quality round tube rolling rolling through the refining process, according to the requirements of API Spec 5CT, finished normalizing the status of delivery; when the
hot-rolled tubes finishing temperature not lower than the normalizing temperature, can replace normalizing.
