Rolling Fiberglass Inner tube (RFI) is a tool which reduces the chance of core jamming problem. This tool is producing to overcome core jamming problems, allowing the operator to stay on bottom and continue coring.
The RFI is recommended for all conventional coring operations where core jamming problems may be expected. It is actively effective in high fractured formations. The RFI is also ideal to reduce the trips which are unacceptable cost.