Adaptive apparatus, system and method for communicating with a downhole device
First Claim
1. A method for delivering information from a surface location on the earth via a rotary drilling assembly to a downhole location or device utilizing drillstring modulation in accordance with pre-defined adaptive rules of transmission, the method comprising;
- rotating the drillstring by motive means located on the surface of the earth,measuring rotary motion of the drillstring at surface,establishing optimal drilling rotary speed at surface then modulating the surface rotary speed in order to effect transmission of information to the downhole location or device,modifying drilling rotary speed at surface in order to optimize the environment for rotary communications such that harmonic vibrations of the drilling assembly are thereby diminished,identifying optimal rotary speed offset values for surface to downhole information transfer giving due consideration to limitations inherent in surface rotational, downhole equipment and the quality of downhole rotary motion,identifying the optimal timing for surface to downhole information data sets giving due consideration to limitations inherent in surface rotational equipment, downhole equipment and the quality of downhole rotary motion, andencoding information and selecting the appropriate format such that the information to be transmitted will be optimally received by any downhole device which is monitoring downhole drillstring rotation.
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Abstract
A system, apparatus and method for adaptive communication with a downhole device is disclosed. The instant invention proposes an adaptive system of communicating information from the surface of the earth to a device located downhole; thereby optimizing the drilling process by adaptively fitting the talkdown protocol around the existing drillstring RPM. A further economic benefit is that with this adaptive system the ΔRPM Offset between the optimized drilling condition and the RPM required for data transmission can be monitored and adjusted in real-time, resulting in less disruption to the drilling process. Several embodiments are given.
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Citations
37 Claims
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1. A method for delivering information from a surface location on the earth via a rotary drilling assembly to a downhole location or device utilizing drillstring modulation in accordance with pre-defined adaptive rules of transmission, the method comprising;
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rotating the drillstring by motive means located on the surface of the earth, measuring rotary motion of the drillstring at surface, establishing optimal drilling rotary speed at surface then modulating the surface rotary speed in order to effect transmission of information to the downhole location or device, modifying drilling rotary speed at surface in order to optimize the environment for rotary communications such that harmonic vibrations of the drilling assembly are thereby diminished, identifying optimal rotary speed offset values for surface to downhole information transfer giving due consideration to limitations inherent in surface rotational, downhole equipment and the quality of downhole rotary motion, identifying the optimal timing for surface to downhole information data sets giving due consideration to limitations inherent in surface rotational equipment, downhole equipment and the quality of downhole rotary motion, and encoding information and selecting the appropriate format such that the information to be transmitted will be optimally received by any downhole device which is monitoring downhole drillstring rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An apparatus for delivering information from a surface location on the earth via a rotary drilling assembly to a downhole location or device utilizing drillstring modulation in accordance with pre-defined but adaptive rules of transmission either integrated into or external to the existing drillstring surface rotary motion drive wherein an interface to the drilling rig rotary drive is provided, said interface being equipped with monitoring, control and logic means for controlling the rotary speed output of the rotary drive and utilizing a method comprising;
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rotating the drillstring by motive means located on the surface of the earth, measuring rotary motion of the drillstring at surface, establishing optimal drilling rotary speed at surface then modulating the surface rotary speed in order to effect transmission of information to the downhole location or device, modifying drilling rotary speed at surface in order to optimize the environment for rotary communications such that harmonic vibrations of the drilling assembly are diminished thereby, identifying optimal rotary speed offset values for surface to downhole information transfer giving due consideration to limitations inherent in surface rotational, downhole equipment and the quality of downhole rotary motion, identifying the optimal timing for surface to downhole information data sets giving due consideration to limitations inherent in surface rotational equipment, downhole equipment and the quality of downhole rotary motion, and encoding information and selecting the appropriate format such that the information to be transmitted will be optimally received by any downhole device which is monitoring downhole drillstring rotation. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification