Abstract: Most casing damages in Zhongyuan oilfield take place in the salt bed formations, and this has remained a problem that seriously threatens oil and gas production for long time. Causes of casing damages were investigated, and a series of measures in casing design have been adopted accordingly, but with unsatisfactory results. To prevent casing damage and expand well life, a thick wall casing, TP130TT of high collapsing strength was designed and developed, based on the analysis to the mechanical conditions of casing and its damaging tendency in the salt bed. The matching technology and tools were also developed. This type of casing has been run in over 200 wells, cementing quality and pressure test results were all satisfactory, with 100 percent of successful rate.