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《Atural Gas Industry》 1989-02
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Casing and Tubing with Special Thread for Deep Well With High Pressure

Zhao Linlin  
In recent years, the casing and tubing series with special thread such as VAM, 2SC, 3SB, NS, etc., have been widespreadly used in various deep oil-gas wells with high pressure in the world. In this paper, from the world trend in developing casing and tubing products, the textural principle of special thread is briefly introduced. Besides analyzing the advantages of SB and VAM special thieads, the main properties of six types of special thread are compared through tabulating, and the concrete opinions on choice, inspection and use, etc. are proposed also.
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