Technology Requirement and Standardization of Tubing and Casing not Specified by API in Tarim Oil Field

An investigation on tubing and casing failure accidents was done. It was considered that the technology standard should be in accordance with the service condition of tubing and casing, and strict technology standard is benefit to prevent from failure accidents. Unification standard not only is responsibility of both oil field and mill and is in favor of reduction buying cost, but also is advantaged to oil field manage and reduce storage and is benefit to most manufactory and develop nation industry. It was suggested that dimension precision, material performance, seal performance and so on, should be specified strictly in tubing and casing standard according to the service condition. An example was given at last that the casing standard was applied successfully to the third well structure in Tarim oil field so far.