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Super-high collapse resistant casings were developed by using Ti,Nb and V microalloyed CrMo steel and cross rolling techniques.A transmission electron microscope(TEM)and X-ray diffractometer were used to observe the characteristics of the microstructure.It was found that the(111)texture and the nano-scale precipitates distribute in a way that is beneficial to the collapse resistance,and the collapse strength of the prepared casing had a measurement, which was approximately 60% higher than the API standard value.A design concept to attain super-high collapse resistance is proposed based on the texture design and microstructure control.
Super-high collapse resistant casings were developed by using Ti, Nb and V microalloyed CrMo steel and cross rolling techniques. A transmission electron microscope (TEM) and X-ray diffractometer were used to observe the characteristics of the microstructure. It was found that the (111) texture and the nano-scale precipitates distribute in a way that is beneficial to the collapse resistance, and the collapse strength of the prepared casing had a measurement, which was approximately 60% higher than the API standard value. A design concept to attain super-high collapse resistance is proposed based on the texture design and microstructure control.