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At the conclusion of the functional and pressure testing, the BOP stack is
disconnected from the test stump and is ready to be run on drill pipe running tools
or on the marine riser (fig. 6.19). Subsea testing, of course, cannot be as extensive
as surface testing. The frequency of subsea testing may vary with operators as well
as with local regulations governing the minimum frequency of subsea testing. A
test plug run on drill pipe seals off the casing while testing. Flow from the pipe
would indicate a leak in the test plug. The blind shear rams may be function-tested
periodically, but no satisfactory method is available currently for pressure testing
without high risk of rupturing the casing.
Figure 6.19 – BOP stack being installed from semi.
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