LSAW Steel Pipe

 Oil casing pipe 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. Oil casing can be divided into: conduit, surface casing, technical casing and oil casing according to the usage. Different types of American standard oil casings are used in the oil production process: For the purpose of maintaining drilling, to avoid contamination of shallow and shallow gas layers, to support wellhead devices, and to bond the weight of other layers of casing; technical casings will be of different grades The pressure is separated to ensure the normal flow of drilling fluid quantitatively; the manufactured casin...

    Oil casing pipe is a steel pipe used to support the wall of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion.     According to the American Petroleum Institute standard APISPEC5CT first edition in 1988, casing steel grades H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P- There are 10 types of 110 and Q-125. The casing should be supplied with threads and couplings, or in the form of any of the following pipe ends: flat ends, round threads without couplings or couplings, partial trapezoidal threads with couplings or couplings, straight Thread, special end processing, seal ring structure.     (1) The main importing countries of petroleum casing are: Germany, Japan, Romania, Czech Republic, Italy, Britain, Austria, Switzerland, United States, Argentina, and Singapore. Import standards refer to API5A, 5AX, 5AC standards of the American Petroleum Institute. The steel grades are H-40...

　　The strength and quality of the oil casing pipe is always a concern for everyone, because the quality of the oil casing is one of the important factors affecting China's crude oil production. In fact, the causes of its damage include non-uniform stress, corrosion, and sand formation in the oil layer. And high pressure water injection. Regarding the strength of the oil casing, the API standard does not clearly point out the effects of non-uniform stress, geometric defects of the oil casing, and residual stress on the bearing capacity of the casing on the bearing capacity of the oil casing. Therefore, the impact of these unpredictable conditions makes it difficult for the designer to determine the impact of these factors on the strength of the oil casing. 　　Now, oil casing manufacturers understand that the existing data have analyzed the effects of geometric defects, residual stress, non-uniform ground stress and other factors on the strength of the oil casing. Most literature is...

　　The oil casing pipe is used to support the oil and gas well walls to ensure the normal operation of the entire well after the drilling process is completed. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is down, the cement is to be cemented. It is different from the oil pipe and the drill pipe and cannot be reused. It is a disposable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. 　　The oil special pipe is mainly used for drilling oil and gas wells and conveying oil and gas. It includes oil drill pipes, oil casings, and oil pipes. Oil drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. The oil casing is mainly used for supporting the well wall during and after the completion of the drilling process to ensure the drilling process and the normal operation of the entire well after completion. The oil pipe mainly transports th...