APPARATUS AND METHOD FOR AUTOMATED DRILLING OF A BOREHOLE IN A SUBSURFACE FORMATION
First Claim
1. A method for automated drilling of a borehole in a subsurface formation, comprising:
- selecting at least one control variable;
defining a drilling performance objective having a value that is influenced by drilling of the borehole using the at least one control variable;
drilling a first interval of the borehole maintaining the at least one control variable at a first value;
drilling a second interval of the borehole maintaining the at least one control variable at a second value; and
drilling a third interval of the borehole maintaining the at least one control variable at a third value, the third value being selected based on a comparison of the value of the drilling performance objective while drilling the first interval and the value of the drilling performance objective while drilling the second interval to a predetermined optimal value of the drilling performance objective.
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Accused Products
Abstract
Apparatus and method for automated drilling of a borehole in a subsurface formation. In one embodiment, a method includes selecting at least one control variable. A drilling performance objective having a value that is influenced by drilling of the borehole using the at least one control variable is defined. A first interval of the borehole is drilled maintaining the at least one control variable at a first value. A second interval of the borehole is drilled maintaining the at least one control variable at a second value. A third interval of the borehole is drilled maintaining the at least one control variable at a third value. The third value is selected based on a comparison of the values of the drilling performance objective while drilling the first interval and the second interval to a predetermined optimal value of the drilling performance objective.
21 Citations
24 Claims
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1. A method for automated drilling of a borehole in a subsurface formation, comprising:
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selecting at least one control variable; defining a drilling performance objective having a value that is influenced by drilling of the borehole using the at least one control variable; drilling a first interval of the borehole maintaining the at least one control variable at a first value; drilling a second interval of the borehole maintaining the at least one control variable at a second value; and drilling a third interval of the borehole maintaining the at least one control variable at a third value, the third value being selected based on a comparison of the value of the drilling performance objective while drilling the first interval and the value of the drilling performance objective while drilling the second interval to a predetermined optimal value of the drilling performance objective. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for automated drilling of a borehole in a subsurface formation, comprising:
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a drill sting for drilling the borehole, the drill sting controlled by a set of control variables; sensors for measuring a plurality of drilling variables during drilling of the borehole; a drilling performance optimizer configured to; evaluate, based on at least one of the drilling variables, a drilling performance objective having a value that is influenced by drilling of the borehole using the set of control variables; and select an operative set of values for the set of control variables based on the value of the drilling performance objective. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer-readable medium encoded with computer-executable instructions for automated drilling of a borehole in a subsurface formation, when executed the computer-executable instructions cause a processor to:
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control drilling of a first interval of the borehole using a set of control variables populated with a set of first values; determine a first value of a drilling performance objective corresponding to drilling of the first interval of the borehole; control drilling of a second interval of the borehole using the set of control variables populated with a set of second values; determine a second value of the drilling performance objective corresponding to drilling of the second interval of the borehole; and control drilling of a third interval of the borehole using the set of control variables populated with a set of third values selected based on a determination of which of the first and second values of the drilling performance objective is closest to a predetermined optimal value of the drilling performance objective. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification