| 摘要 |
A rotating control apparatus, comprising:
an outer member;
an inner member having a first sealing element and a second sealing element; said inner member, said first sealing element and said second sealing element rotatable relative to said outer member;
a first cavity defined by said inner member, said first sealing element and said second sealing element; and
said inner member having a port to said first cavity.
Disclosed is also a method for drilling a wellbore in a formation with a fluid, comprising the steps of:
casing a portion of the wellbore using a casing having a casing shoe;
determining a casing shoe pressure;
determining a formation fracture pressure;
positioning a rotating control device with said casing; and
drilling the wellbore at a fluid pressure calculated using the lesser of the casing shoe pressure and the formation fracture pressure. |
