api l80 13cr oil casing and tubing  

api l80 13cr oil casing and tubing Tubing is mainly used to provide oil and gas flow passage during production of oil and gas wells. For flowing wells, due to the large inner diameter of the casing, the casing is directly used for production. Due to the density difference, pressure drop and expansion, the liquid flows up rapidly, causing the liquid to slip, resulting in the ineffective utilization of the downhole elastic energy. Running tubing with smaller OD and ID during production can effectively solve the above problems by allowing fluid to flow in the tubing. Therefore, running tubing is required during production of flowing wells. The downhole operation and production of flowing well and non flowing well can be completed by using various tools for tubing running. Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells or wellbore. It is inserted into a well bore and cemented in place to protect both subsurface f…