OIL WELL PIPE CONNECTION STRUCTURE AND OIL WELL PIPE

摘要

Provided is means for connecting oil well pipes together with a compact/simple structure and the strength that significantly exceeds the limits of prior art even without the flange, etc. An oil well pipe coupling structure includes a first oil well pipe and a second oil well pipe, the external thread portion has a first external thread portion, a substantially tapered second external thread portion, and a third external thread, the internal thread portion has a first internal thread portion, a substantially tapered second internal thread portion, and a third internal thread portion the first external thread portion is screwed to the first internal thread portion, the second external thread portion is screwed to the second internal thread portion, the third external thread portion is screwed to the third internal thread portion, and the first oil well pipe and the second oil well pipe are coupled together.