The company has obtained the processing authorization agreement of flushmax series special casing pipe of meidawang company of Japan, and has professional technical personnel and Mori precision lathe of Japan to ensure the quality and mass production of meidawang special casing pipe products. Under the premise of ensuring the strength of string, special casing can obtain more working space, reduce the number of casing layers and reduce the production cost. At the same time, the company actively cooperates with other units to jointly develop special products with independent intellectual property rights.