After nearly 20 years of efforts, China’s oil casing production from scratch, from low price to high price, from low steel grade to API series products, and then to non API products with special requirements, from quantity to quality, they are close to the level of foreign oil and casing products. The domestic market share of China’s oil well tubing has exceeded 80%, and it has become a net export product for many years.

According to the regional distribution in China, the demand for oil and casing is no longer concentrated in the eastern region. From the perspective of the development trend of domestic oil and gas fields, the development of Daqing, Liaohe, Shengli and other Eastern oilfields has turned to the development of Western oilfields such as Sichuan and Xinjiang, paying attention to the trend of offshore oil fields. In addition, it will develop from land to beach and from shallow sea to deep sea. In addition, the drilling depth is getting deeper and deeper, and the drilling work is becoming more and more complex, and the requirements for oil and casing must be higher and higher.

Different types of casing used in the process of oil production: surface oil casing – protecting the well from being polluted by shallow water and gas layers – supporting wellhead equipment and maintaining the weight of other layers of casing. Technical oil casing – separate the pressure of different layers, so as to ensure the normal circulation of drilling fluid quota and protect the production casing. -In order to install anti burst device, leak proof device and liner in the well. Oil casing – oil and gas are transported from the reservoir below the surface. -Used to protect the well and separate the drilling mud. In the production of oil casing, the outer diameter is usually 114.3 mm to 508 mm.

The well head is protected by the weight of the casing in shallow water.

Technical oil casing – separate the pressure of different layers, so as to ensure the normal circulation of drilling fluid quota and protect the production casing. -In order to install anti burst device, leak proof device and liner in the well.

Oil casing – oil and gas are transported from the reservoir below the surface. -Used to protect the well and separate the drilling mud. In the production of oil casing, the outer diameter is usually 114.3 mm to 508 mm.

According to SY / t6194-96 “petroleum casing”, oil casing can be divided into short thread casing and its coupling and long thread casing and coupling.