| 摘要 |
Operation of a multi-variable drilling-rig is carried out within an envelope defined by convex hulls (TC,BC) that are derived from sets of historical values for the variables accumulated in a store ( 3 ) from previous operations. A display unit ( 5 ) shows the real-time values (Q 01 -Q 10 ) of the variables on parallel axes (X 01 -X 10 ) together with upper and lower limits (Up 01 -Up 10 , Lp 01 -Lp 10 ) of the viable ranges for each variable to remain within the envelope, taking into account the current value of each other variable. The adjustment of the value of a variable (Q 03 ) required to correct for a variable (Q 08 ) found to be outside its viable range, is determined tentatively before implementation, by adjusting that value in the display to bring about re-calculation and display of the changes in viable ranges that would result from such adjustment.
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