Abstract: Elaborated here in the article are the chemical composition,the manufacturing process and the product mechanical properties of the BT135VRE casing for deep-well shale gas production.The said casing is produced by means of mainly using the medium carbon Cr-Mo-V series steel with certain rare earth elements,and the proper control of the manufacturing process.Analyzed are the non-metallic inclusions,the metallographic structure,the ambient temperature mechanical properties,the hi-temperature tensile property,and the collapse resistance,etc.of the said casing.Furthermore the full-scale product performance evaluation is also conducted.The analysis result leads to the conclusion that the BT135VRE casing features low class of non-metallic inclusion,homogeneous microstructure,high dimensional accuracy,and excellent mechanical properties,having been passed the API RP 5C5—2017 CAL IV test for the product,and thus is beyond doubt suitable for servicing deep well shale gas production.