Effect of Cold Work on Mechanical Properties of Expandable Tubulars
نویسندگان
چکیده
Some of the challenges being faced by the petroleum development industry worldwide are low-cost and more efficient well completion, water-shutoff, other types of zonal isolation, etc. Successfully addressing these issues, solid expandable tubulars (SETs) are finding increasing use for enhanced oil recovery from difficult or damaged wells. All SET applications revolve around cold expansion of the tubular in a casing or in an open hole, by hydraulically pushing a cone through the tubular, or by mechanically pulling it. Issues such as maximum expansion ratio, post-expansion pipe integrity, etc are directly linked with material properties of the tubular before and after expansion. An SET expansion test rig has been designed, fabricated, and commissioned at the Engineering Research Lab, Sultan Qaboos University (SQU) in collaboration with Petroleum Development Oman (PDO). Various types of material testing and characterization equipment augment this facility. The current paper presents some results from an ongoing study about comparison of pre and post-expansion mechanical properties of the tubular material subjected to different expansion ratios. Material properties specifically addressed here are elastic modulus, yield strength, tensile strength, fracture stress, fracture strain, and ductility.
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