Dynamic friction drill string oscillation systems and methods
First Claim
1. A system, comprising:
- a controller configured to;
determine a resonant frequency of a drill string,generate a rotational acceleration profile having a frequency at least substantially similar to the determined resonant frequency,impose the generated rotational acceleration profile over a first acceleration profile to generate a modified acceleration profile, wherein the first acceleration profile rocks the drill string back and forth so as to maintain a desired toolface orientation; and
instruct a drive system to oscillate the drill string according to the modified acceleration profile; and
the drive system configured to;
receive instructions from the controller, andoscillate the drill string according to the modified acceleration profile so that the drill string oscillates at a frequency substantially similar to the determined resonant frequency while slide drilling.
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Accused Products
Abstract
Systems and methods for slide drilling are described. The system includes a controller and a drive system. The controller is configured to determine a resonant frequency of a drill string, generate a rotational acceleration profile having a frequency at least substantially similar to the determined resonant frequency, and provide one or more operational control signals to oscillate the drill string based on the generated rotational acceleration profile. The drive system is configured to receive the one or more operational control signals from the controller, and oscillate the drill string based on the generated rotational acceleration profile so that the drill string oscillates at a frequency substantially similar to the determined resonant frequency while slide drilling.
119 Citations
21 Claims
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1. A system, comprising:
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a controller configured to; determine a resonant frequency of a drill string, generate a rotational acceleration profile having a frequency at least substantially similar to the determined resonant frequency, impose the generated rotational acceleration profile over a first acceleration profile to generate a modified acceleration profile, wherein the first acceleration profile rocks the drill string back and forth so as to maintain a desired toolface orientation; and instruct a drive system to oscillate the drill string according to the modified acceleration profile; and the drive system configured to; receive instructions from the controller, and oscillate the drill string according to the modified acceleration profile so that the drill string oscillates at a frequency substantially similar to the determined resonant frequency while slide drilling. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of oscillating a drill string while slide drilling, which comprises:
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calculating, by a controller, a resonant frequency of the drill string using an effective torsional spring constant (Kf) of the drill string and moment of inertia (I) of a top drive; generating, by the controller, a rotational acceleration profile having the calculated resonant frequency; imposing, by the controller, the generated rotational acceleration profile over a first acceleration profile to generate a modified acceleration profile, wherein the first acceleration profile rocks the drill string back and forth so as to maintain a desired toolface orientation; and instructing the top drive, by the controller, to oscillate the drill string according to the modified acceleration profile so that the drill string oscillates at about the calculated resonant frequency while slide drilling. - View Dependent Claims (9, 10, 11, 12)
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13. A non-transitory machine-readable medium having stored thereon machine-readable instructions executable to cause a machine to perform operations that, when executed, comprise:
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determining a resonant frequency of a drill string; generating a rotational acceleration profile comprising a sine wave having a frequency at least substantially similar to the determined resonant frequency; imposing the generated rotational acceleration profile over a first acceleration profile to generate a modified acceleration profile, wherein the first acceleration profile rocks the drill string back and forth so as to maintain a desired toolface orientation; instructing a top drive to oscillate the drill string according to the modified acceleration profile so that the drill string oscillates at a frequency substantially similar to the calculated resonant frequency while slide drilling; and maintaining the desired toolface orientation while slide drilling. - View Dependent Claims (14, 15, 16)
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17. A method of oscillating a drill string while slide drilling, which comprises:
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calculating, by a controller, a resonant frequency of the drill string using a torsional stiffness of a drill pipe and a moment of inertia of a bottom hole assembly; generating, by the controller, a rotational acceleration profile having the calculated resonant frequency; imposing, by the controller, the generated rotational acceleration profile over a first acceleration profile to generate a modified acceleration profile, wherein the first acceleration profile rocks the drill string back and forth so as to maintain a desired toolface orientation; and instructing a top drive, by the controller, to oscillate the drill string according to the modified acceleration profile so that the drill string oscillates at a frequency substantially similar to the calculated resonant frequency while slide drilling. - View Dependent Claims (18, 19, 20, 21)
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Specification