Main import and export of oil casing
The oil casing pipe is a kind of large diameter pipe, which has the function of fixing the wall of oil and gas well or well. The casing is inserted into the well hole and fixed with cement to prevent the borehole from separating the rock formation and the borehole collapse, and ensuring the circulation of the drilling mud to be used for drilling. Different types of casing used in oil exploitation:
The surface oil casing is protected from drilling, so that it can avoid the pollution of shallow water and shallow gas reservoirs, and support the wellhead equipment and keep the weight of the other layers of the casing.
The technology of oil casing is separated by different levels of pressure, so that the amount of normal drilling fluid circulation and protect the production casing, for the installation of anti blowout device, leak proof device and a tail tube in a well.
Oil reservoir is mainly derived from oil and natural gas from the surface of the earth's surface. When the oil casing is produced, the outside diameter is usually 114.3 mm to 508 mm.
The main import countries are: Germany, Japan, Romania, Czech, Italy, the United Kingdom, Austria, Switzerland, the United States, Argentina, Singapore also has imports. Import standards refer to the American Petroleum Institute standard 5AX, API5A, 5AC. Steel grade is H-40, J-55, N-80, P-110, C-75, C-95, etc.. Specifications are mainly 139.77.72R-2177.89.19R-2244.58.94R-2244.510.03R-2244.511.05R-2, etc..
API specified length has three kinds: namely R-1 is 4.88 ~ R-2, 7.62m is 7.62 ~ 10.36m, R-3 is 10.36m to longer. Imported from Japan in addition to the use of API standard casing, and a small part of the Japanese standard (such as iron, Sumitomo, Kawasaki, etc.) steel is NC-55E, NC-80E, NC-L80, NC-80HE etc..
Part of the import goods marked with the words LTC, that is, the thread of the casing. In the case of the claim, there have been black buckle, thread damage, tube folding, buckle and broken thread standoff tolerance, coupling J value ultra poor appearance defects and casing embrittlement, yield strength of low internal quality problems.
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