First, the definition of oil casing
Oil-specific pipes are mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipes, oil casing, and pumping pipes. Oil drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. Oil casing is mainly used to support the well wall during drilling and after completion to ensure the normal operation of the entire oil well during the drilling process and after completion. Pumping pipes mainly transport oil and gas from the bottom of the oil well to the ground.
Oil casing is the lifeline to maintain the operation of oil wells. Due to different geological conditions, the stress state downhole is complex, and the combined effects of tension, compression, bending, and torsion stress act on the pipe body, which puts higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well or even scrapping.
According to the strength of the steel itself, the casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Different well conditions and well depths require different steel grades. In corrosive environments, the casing itself is also required to have corrosion resistance. In places with complex geological conditions, the casing is also required to have anti-squeeze performance.
Second, the types of oil casing
Different types of casing used in the oil production process: Surface oil casing protects the drilling to prevent it from being contaminated by shallow water and shallow gas layers, supports the wellhead equipment, and maintains the weight of other layers of the casing. Technical oil casing separates the pressure of different layers so that the drilling fluid can circulate normally and protect the production casing. To install anti-burst devices, leak-proof devices, and tailpipes in the drilling well. Oil layer oil casing guides oil and natural gas from the reservoir layer under the surface. Used to protect the drilling and stratify the drilling mud. When oil casing is produced, the outer diameter is usually 114.3 mm to 508 mm.
Protect the drilling well from pollution by shallow water and shallow gas layers, support the wellhead equipment, and maintain the weight of other layers of the casing.
Technology Oil casing separates the pressure of different layers so that the drilling fluid can flow normally and protect the production casing. To install anti-burst devices, leak-proof devices, and tailpipes in the drilling well.
Oil layer oil casing: guides oil and natural gas from the reservoir layer under the surface. Used to protect drilling and stratify drilling mud. When oil casing is produced, the outer diameter is usually 114.3 mm to 508 mm.
According to SY/T6194-96 “Oil Casing”, the types and packaging of oil casing are divided into the short threaded casing and its couplings and long threaded casing and its couplings.
Post time: Nov-01-2024