What is API 5L Petroleum Casing?

API is an abbreviation of American Petroleum Institute. Founded in 1919, API is the first national business association in the United States. An important task of API is to be responsible for the standardization of equipment used in the oil and gas industry to ensure the safe and reliable interchangeability of equipment used in the industry.API’s certification standards also enjoy a high reputation internationally. Petroleum machinery with the API mark is not only considered to be of reliable quality and advanced technology, of course, the price is also higher.

API standards are divided into three categories:
(1) Specifications for the design and manufacture of petroleum equipment;
(2) Recommended practices for the use and maintenance of petroleum equipment;
(3) Recommended practices for drilling and oil production operations.

In general, API standards are reviewed, revised, reconfirmed or withdrawn at least once every 5 years. Sometimes the review period can be extended once, but the extension does not exceed 2 years. Therefore, the republication of air superiority has been postponed, and the API standard will no longer be valid after 5 years from the date of publication.

API does not require mandatory laboratory testing for products applying for certification, but API has proposed 55 detailed specifications for various equipment involved in the collection and processing industries of oil and natural gas. For example, the 6D specification involves pipeline valves, including ball valves, gates, check valves, etc. These specifications specify the minimum requirements for petroleum steel pipe products to be met. Although there is no mandatory inspection, API observers will check the product plan submitted by the manufacturer to ensure that the manufacturer’s production process is in the implementation of the product planning system.

API oil casing is mainly used for the drilling of oil and gas wells and the transportation of oil and gas. It includes oil drilling pipes, oil casings, and oil sucking pipes.

Oil drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. The oil casing is mainly used to support the well wall during the drilling process and after the well completion, so as to ensure the drilling process and the normal operation of the entire oil well after the well completion.

Oil casing is the lifeblood of keeping oil wells running. Due to different geological conditions, the downhole stress state is complex, and the comprehensive action of tension, compression, bending and torsional stress acts on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to the reduction of production of the entire well, or even to be scrapped.

Chase Liu