石油专用套管要求表面涂层,以防止在运输、贮存过程中锈蚀。同时在固井时,要求不清除涂层下井,但又不得影响固井质量。在我国都是人工涂层,下井时,除日本进口套管外,国产套管和罗马尼亚进口套管的涂层都因影响固井质量需要事先予以清除。因此,劳动强度大,效率低,对套管和油井的生产均为不利。 Special oil casing requirements of the surface coating to prevent corrosion during transport and storage. At the same time when cementing, it is required not to remove the coating downhole, but it must not affect the cementing quality. In our country are all artificial coating, go down, in addition to Japan’s imports of casing, casing and Romania imported casing due to affect the quality of cementing needs to be cleared in advance. As a result, labor intensiveness and inefficiency are detrimental to casing and well production.