As an important component for oil drilling, oil casings also include drill pipes, core pipes and drill collars, casings and steel pipes for small diameter drilling. The domestic casing is made of geological drilling steel by hot rolling or cold drawing. The steel number is expressed by geology, and the oil pipe casing is imported from Japan, Germany, Italy, Britain, etc. The import specifications refer to the specifications of the Petroleum Institute. Moreover, the length of the oil pipe sleeve is also divided into many types, and some imported goods are marked with the word LTC, that is, a filament buckle casing. In addition to the API specifications, there are a few other specifications for Japanese factories. Sometimes oil casings present some quality problems, such as black buckles, thread damage, tube folding, broken buckles and tight thread spacing.
Oil casings If it is used for oil and gas well drilling and oil and gas transportation, it is inseparable. It contains oil drill pipes, casings, and oil pipes.
Oil drill pipes are used to connect drill collars and drill bits and transmit drilling power. The oil casing should be used to support the well wall after drilling and completion to ensure the drilling process and the normal operation of the well after completion. Pumping pipe If the oil and gas at the bottom of the well are transported to the ground. Oil casing is the foundation for keeping the well operating. Due to the difference of geological conditions, the stress condition in the underground is disordered, and the tensile, compressive, bending and torsional stresses are summarized in the pipe body, which raises a high request for the quality of the casing itself. Once the casing itself is damaged for some reason, it may result in a reduction in production or even a waste of all wells. According to the strength of the steel itself, the casing can be divided into different steel grades. Depending on the well condition and the depth of the well, different steel grade casings are used. The casing itself is also required to have corrosion resistance in a corrosive environment. In the geological conditions, the casing is also required to have a certain anti-crushing function.