The casing is one of the oil pipes. The pipes used in oil are collectively referred to as oil pipes. The oil pipes include finished oil casings, drill pipes, drill collars, couplings and short rods.
The casing is a steel pipe supporting the oil and gas well wall. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is down, the cement is used for cementing. It is different from the oil pipe and the drill pipe and cannot be reused. It is a consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. Casing can be divided into: duct, surface casing, technical casing and oil casing.
Guide sleeve: It is mainly used for drilling in oceans and deserts to separate seawater and sand to ensure smooth drilling. The main rule of this casing [galvanizing can increase the corrosion resistance of steel pipes and prolong the service life. Galvanized pipes are widely used, in addition to pipelines for general low-pressure fluids such as water, gas, oil, etc., and also used as oil well pipes and oil pipes in the petroleum industry, especially in offshore oil fields, and oil heaters and condensation of chemical coking equipment. Cooler, coal distillate oil exchanger pipe, and trestle pipe pile, support pipe for mine tunnel, etc.
The oil casing is used to support the oil and gas well walls to ensure the normal operation of the entire well after the drilling process is completed. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is down, the cement is used for cementing. It is different from the oil pipe and the drill pipe and cannot be reused. It is a consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. Oil casing is the lifeline for maintaining oil well operations. Due to different geological conditions, the state of the downhole is complicated, and the combined action of tension, compression, bending and torsion stress acts on the pipe body, which puts high requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may result in a reduction in production and even scrapping of the entire well. According to the strength of the steel itself, the casing can be divided into different steel grades, namely JKNLCTPQV150. The well conditions and well depth are different, and the steel grades used are also different.
11 3/4"(298.45mm), API 5CT Seamless Casing pipe
API-5CT Casing Pipe Steel grade: J55/K55/N80/L80/P110/C95/13Cr/28Cr
Threads: BTC, LTC, STC，PRMIUM CONNECTION
Length range: R1, R2, R3
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298.45(11 3/4" )
J, K, M
J, K, M
J, K, M, L, N, C, P, Q
a: Buttress casing is available with regular, special clearance couplings or special clearance couplings with special bevel.
P= Plain end; S= Short round thread; L= Long round thread; B= Buttress thread.
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