An oil casing is a large diameter tube that serves as a fixed oil and gas hole wall or wellbore. The shell is inserted into the wellbore and fixed with cement to prevent the wellbore from being separated from the wellbore and to ensure that the drilling mud circulates through the hole.
Steel grades for oil casing: H40, J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Housing end face processing forms: short round thread, long round thread, trapezoidal thread, special buckle, etc. Mainly used for oil well drilling, mainly used to support the well wall during and after drilling to ensure the normal operation of the entire well during the drilling process and after completion.
The importance of oil pipelines
The petroleum industry is an industry that uses a large number of petroleum pipelines. Oil pipelines play an important role in the petroleum industry:
1. Oil pipes have a lot of consumption, cost a lot of money, and have great potential to save money and reduce costs. The consumption of oil well pipes can be calculated based on the annual drilling scale. According to China's specific conditions, every 1 meter of drill bit requires 62kg of oil well pipe, including 48kg of casing and 10kg of oil pipe. Drill pipe 3kg, drill shaft 0.5kg;
2. The mechanical and environmental behavior of petroleum pipelines has an important impact on the adoption of advanced technologies and the improvement of petroleum industry production and efficiency;
3. The loss of oil pipes is huge, and its safety, reliability and service life are of great significance to the petroleum industry.
Structure editing
Weight calculation
[(Outer diameter - Wall thickness) * Wall thickness] * 0.02466 = kg/m (weight per meter)
chemical composition
(1) According to SY/T6194-96. The housing and its couplings are of the same steel grade. Sulfur content <0.045%, phosphorus content <0.045%;
(2) Take chemical analysis samples according to the provisions of GB/T222-84. Conduct chemical analysis in accordance with the relevant provisions of GB223;
(3) American Petroleum Institute API specification 5CT 1988 First Edition. Chemical analysis is prepared in accordance with the latest version of ASTM E59 and chemical analysis is performed in accordance with the latest version of ASTM E350.
physical properties
(1) According to SY/T6194-96. Used for flattening test (GB246-97), tensile test (GB228-87) and hydraulic test;
(2) Carry out hydrostatic test, flattening test, sulfide stress corrosion cracking test, hardness test (as specified in the latest version of ASTME18 or E10), tensile test, and transverse impact test (ASTMA370, ASTM E23 and the latest version of relevant standards are specified), particle size determination method (the latest version of ASTM E112 or other methods).
Category editor
Different types of casings used in oil extraction: Surface oil casing protects the well from contamination of shallow water and shallow gas, supports wellhead equipment and maintains the weight of other layers of casing. Technical oil casing separates the pressure at different levels, allowing the drilling fluid to circulate properly and protecting the production casing. To install explosion protection, leak proof devices and tail pipes in the well. The oil inner shell outlet comes from the oil and natural gas stored underground. Used to protect wells and layer drilling mud. When producing oil casings, the outer diameter is usually 114.3mm to 508mm.
Protects the well from shallow water and shallow gas contamination, supports wellhead equipment and maintains the weight of other layers of casing.
Technical oil casing separates the pressure at different levels, allowing the drilling fluid to circulate properly and protecting the production casing. To install explosion protection, leak proof devices and tail pipes in the well.
Reservoir oil casing - export of oil and natural gas from underground storage formations. Used to protect wells and layer drilling mud. When producing oil casings, the outer diameter is usually 114.3mm to 508mm.
According to SY/T6194-96 "Petroleum Casing", the types and packaging of petroleum casing are divided into two types: short sleeves and their couplings, and long threaded sleeves and their couplings.
