Methods and systems for design and/or selection of drilling equipment based on wellbore drilling simulations
First Claim
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1. A method of optimizing drilling parameters for a portion of a wellbore using a rotary drill bit, the method comprising:
- inputting wellbore data and formation data corresponding with the portion of the wellbore;
inputting drilling equipment data, including rotary drill bit parameters and bottom hole assembly parameters;
simulating drilling the portion of the wellbore multiple times with various combinations of drilling parameters using the drilling equipment data, the wellbore data, and the formation data;
the drilling parameters including at least bit rotational speed and either weight on bit or rate of penetration;
calculating a set of bit forces resulting from each of the various combinations of drilling parameters, the set of bit forces including at least one force selected from the group consisting of steer force, walk force, axial force, lateral imbalance force, and torque;
calculating a drilling difficulty based on the resulting bit forces; and
identifying the combination of drilling parameters with the lowest drilling difficulty.
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Abstract
Methods and systems may be provided for simulating forming a wide variety of directional wellbores including wellbores with variable tilt rates and/or relatively constant tilt rates. The methods and systems may also be used to simulate forming a wellbore in subterranean formations having a combination of soft, medium and hard formation materials, multiple layers of formation materials and relatively hard stringers disposed throughout one or more layers of formation material.
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Citations
19 Claims
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1. A method of optimizing drilling parameters for a portion of a wellbore using a rotary drill bit, the method comprising:
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inputting wellbore data and formation data corresponding with the portion of the wellbore; inputting drilling equipment data, including rotary drill bit parameters and bottom hole assembly parameters; simulating drilling the portion of the wellbore multiple times with various combinations of drilling parameters using the drilling equipment data, the wellbore data, and the formation data; the drilling parameters including at least bit rotational speed and either weight on bit or rate of penetration; calculating a set of bit forces resulting from each of the various combinations of drilling parameters, the set of bit forces including at least one force selected from the group consisting of steer force, walk force, axial force, lateral imbalance force, and torque; calculating a drilling difficulty based on the resulting bit forces; and identifying the combination of drilling parameters with the lowest drilling difficulty. - View Dependent Claims (2, 3, 4, 5)
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6. A method of simulating drilling a directional wellbore comprising:
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dividing a planned directional wellbore into portions selected from the group consisting of;
straight hole portion, kick-off portion and equilibrium portion;inputting drilling equipment data, including bit design data; inputting formation data; inputting wellbore data and formation data corresponding with one or more portions of the wellbore; simulating drilling each of the one or more portions of the wellbore multiple times with various combinations of drilling parameters using the drilling equipment data, the wellbore data, and the formation data; the drilling parameters including at least bit rotational speed and either weight on bit or rate of penetration; calculating a set of bit forces resulting from each of the various combinations of drilling parameters; calculating a drilling difficulty based on the resulting bit forces; and identifying the combination of drilling parameters with the lowest drilling difficulty for each of the one or more portions of the wellbore. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for selecting a rotary bit for drilling at least a portion of a wellbore, the method comprising:
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inputting wellbore data and formation data corresponding with the portion of the wellbore; inputting drilling equipment data, including rotary drill bit parameters for at least two rotary bits; simulating drilling the portion of the wellbore using the drilling equipment data, the wellbore data, and the formation data; the drilling parameters including at least bit rotational speed and either weight on bit or rate of penetration; calculating a set of bit forces resulting from each of the at least two bits, the set of bit forces including at least one force selected from the group consisting of steer force, walk force, axial force, lateral imbalance force, and torque; calculating a drilling difficulty for each of the at least two rotary bits based on the resulting bit forces; and identifying the rotary bit having the lowest drilling difficulty. - View Dependent Claims (16, 17, 18, 19)
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Specification