中国石油大学 / 中石油
正确率：100%
30. The principal purposes of circulation fluid are to
A、Clean the bottom of the hole
B、Cool the bit
C、Flush cuttings from the hole
D、Support the walls of the well so that they do not cave in
E、Prevent the entry of formation fluid into the bore-hore.
A、Clean the bottom of the hole
B、Cool the bit
C、Flush cuttings from the hole
D、Support the walls of the well so that they do not cave in
E、Prevent the entry of formation fluid into the bore-hore.
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