API oil casing

The use of steel pipe to manufacture ring-shaped parts can improve the material utilization rate, simplify the manufacturing process, save materials and processing hours, such as rolling bearing collars, jackets, etc., and has been widely used to manufacture steel pipe.

(1) The main importing countries of API oil casing are: Germany, Japan, Romania, Czech Republic, Italy, UK, Austria, Switzerland, USA, Argentina, Singapore are also imported.
(2) There are three kinds of lengths stipulated by API: namely, R-1 for 4.88 to 7.62m, R-2 for 7.62 to 10.36m, and R-3 for 10.36m to longer.　(3) Some of the imported goods are marked with the word LTC, i.e. long silk buckle casing.
(4) Imported casing from Japan, in addition to the use of API standards, there are a small number of implementation of Japanese factory standards.
(5) In the claim cases, there have been black buckle, fillet buckle damage, tube body folding, broken buckle and thread tightness distance exceeds the poor, joint J value exceeds the poor and other appearance defects and casing brittle crack, yield strength low and other inherent quality problems.

ASTM steel pipe can be divided into different steel grades according to the strength of the steel itself, i.e. J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Well conditions and depths are different, and the steel grade used is also different. In corrosive environments, the casing itself is required to have anti-corrosive properties, and API seamless steel pipe is required to have anti-crushing properties in places with complex geological conditions. Pumping pipe is mainly used to transport oil and gas from the bottom of oil wells to the surface.

API oil casing is mainly used for drilling of oil and gas wells and transmission of oil and gas. It includes oil drilling pipe, oil casing and pumping pipe.
Oil drill pipe is mainly used to connect drill collar and drill bit and transmit drilling power. Oil casing is mainly used to support the well wall during the drilling process and after completion to ensure the drilling process and the normal operation of the whole well after completion.

Oil casing is the lifeline to keep the well running. Due to different geological conditions, the downhole stress state is complex, and the combined effects of tensile, compressive, bending and torsional stresses on the tubing body place high demands on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to production reduction or even scrapping of the whole well.