Development of casing design systems for horizontal wells

In the petroleum industry, mining of horizontal wells is extensively carried on with a view to improving the efficiency of recovering oil and gas and activating the existing oil wells. Since it has not been clarified yet how such factors as casing bending and wear, a friction force between the casing and the well wall and so exert influence on the properties of steel pipe, safe and economical casing designing technology has not been established. From this sense, the properties of steel pipe under the conditions of horizontal well load were clarified, and a casing design system incorporating these knowledge bases was developed and marketed under the trade name JCASING. This system has various serviceable functions such as material selection technology on a material with a property of resistance to sulfide stress cracking through hydrogen as a medium, multi-string design technology taking account of kick tolerance, data base storage on the highly functional oil well pipes, and so on.