Autoreaming systems and methods
First Claim
1. A method for controlling movement of a bit of a drilling assembly during reaming of an already-drilled hole, the method comprising a.) determining a ream speed for downward movement of the bit in a hole, the hole having a hole bottom, b.) moving the bit downward in the hole at said ream speed, c.) determining a time period for deceleration of the downwardly moving bit to the hole bottom, d.) determining a value for a target drilling parameter for drilling beyond the bottom of the hole, e.) decelerating the bit for the time period, and f.) achieving the value for the target drilling parameter when the bit reaches the bottom of the hole.
1 Assignment
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Accused Products
Abstract
Methods and systems for controlling movement of a bit of a drilling assembly during reaming of an already-drilled hole; the methods, in certain aspects, including determining a ream speed for downward movement of the bit in the hole, moving the bit downward in a hole at said ream speed, determining a time period for deceleration of the bit to the hole bottom, determining a value for a target drilling parameter for drilling beyond the bottom of the hole, decelerating the bit (linearly or non-linearly) for the time period, and achieving the value for the target drilling parameter when the bit reaches the bottom of the hole.
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Citations
22 Claims
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1. A method for controlling movement of a bit of a drilling assembly during reaming of an already-drilled hole, the method comprising
a.) determining a ream speed for downward movement of the bit in a hole, the hole having a hole bottom, b.) moving the bit downward in the hole at said ream speed, c.) determining a time period for deceleration of the downwardly moving bit to the hole bottom, d.) determining a value for a target drilling parameter for drilling beyond the bottom of the hole, e.) decelerating the bit for the time period, and f.) achieving the value for the target drilling parameter when the bit reaches the bottom of the hole.
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14. A method for controlling movement of a bit of a drilling assembly during reaming of an already-drilled hole, the method comprising
determining a ream speed for downward movement of the bit, moving the bit downward in a hole at said ream speed, determining a time period for deceleration of the downwardly moving bit to the hole bottom, determining a value for a target drilling parameter for drilling beyond the bottom of the hole, decelerating the bit for the time period, achieving the value for the target drilling parameter when the bit reaches the bottom of the hole, the target drilling parameter is rate of penetration, the bit moves a first distance at the ream speed, the bit moves a second distance during the time period, the second distance a minimum distance within which a linear deceleration is achieved for the bit to be brought to the bottom of the hole, and a controller controls movement of the bit.
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16. A system for controlling movement of a bit in reaming a hole, the system comprising:
- a) a sensor for measuring a target drilling parameter associated with drilling past a bottom of an already-drilled hole, said reaming done by a system with a bit;
b) a controller to receive a measured target drilling parameter from the sensor and to compare the measured target drilling parameter to a predetermined setpoint for the measured target drilling parameter; and
c) the controller adjusting deceleration of the bit as the bit approaches the setpoint. - View Dependent Claims (17, 18)
- a) a sensor for measuring a target drilling parameter associated with drilling past a bottom of an already-drilled hole, said reaming done by a system with a bit;
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19. A computer readable medium containing instructions that, when executed, cause a controller to control operation of a drilling assembly with a bit according to the following method:
- a.) determining a ream speed for downward movement of the bit in the hole, the hole having a hole bottom, b.) moving the bit downward in a hole at said ream speed, c.) determining a time period for deceleration of the downwardly moving bit to the hole bottom, d.) determining a value for a target drilling parameter for drilling beyond the bottom of the hole, e.) decelerating the bit for the time period, and f.) achieving the value for the target drilling parameter when the bit reaches the bottom of the hole.
- View Dependent Claims (20, 21, 22)
Specification