OCTG are mainly used for oil and gas well drilling and oil and gas transportation.It includes oil drill pipe, casing and tubing. Petroleum drill pipes are mainly used for connecting collars and passing drills and drilling power. Oil pipes mainly usedin the drilling process and after the completion of the wall support, to ensure thatthe whole of oil wells during drilling and completion work. Pipeline mainly carryoil and gas at the bottom of the well to the surface.
Lifeline of the casing is to maintain a well run. Because of the different geologicalconditions, and complex underground applied force, tension, compression,bending, torsional stresses acting on the pipe, the higher demands on the qualityof the casing itself. Once the casing is damaged for some reason, can cause theentire well of cutbacks or even scrapped.
According to the strength of the steel itself can be classified into different gradesof steel casing, J55, K55 、 N80 、 L80, C90, T95, P110, Q125, V150, etc. Jing Kuang, deep differences of steel grade used is different. Also called casing in acorrosive environment itself has a resistance to corrosion. Casing in place withcomplex geological conditions requirements with collapsing properties.
United States Petroleum Institute standard APISPEC5CT1988 1th Edition ofcasing steel grade, H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110, Q-125, total 10. Casing shall be threaded and coupling supplier, or by any of thefollowing tube end supplied:
Flat end, round thread without a collar or belt Hoop, buttress thread with collarsor without coupling, direct-connect screw end processing, seals, specialstructures.
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