WELL CONTROL EQUIPMENT (NEXT NETWORK OF EXCELLENCE IN TRAINING)
Rams
Variable Bore Rams
1.The Variable Bore Ram, or VBR, seals on several sizes of pipe
or hexagonal kelly within its specified size range. A typical range is from
5" to 3-1/2" diameter Other size ranges, such as 7" to
4-1/2" diameter, are available upon request.
2.VBRs are not intended for long-term stripping use.
3."Stripping" refers to moving drill pipe vertically
within the well while the BOPs remain closed, maintaining a seal around the
pipe.
4.During stripping, the drill pipe and larger diameter tool
joints are pulled through the packers in fully closed rams. This procedure is
typically used in workover and servicing operations using annular BOPs and specialty
rams.
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