METHOD AND SYSTEM FOR DETECTING A STATE OF A JOINT OF A DRILL STRING
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United States of America Patent
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Issued Date -
Mar 28, 2024
app pub date -
Nov 30, 2021
filing date -
Dec 21, 2020
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Abstract
The present invention relates to a method for determining state of at least one joint of a drill string of a drill rig, the drill rig including a percussion device for inducing shock waves into the drill string, and a sensor for sensing stress waves in the drill string caused by impacts of the percussive device, the method comprising, when a stress wave is induced into the drill string by the percussive device: determining a representation of the incident stress wave caused by the percussive device; determining a representation of a reflected wave representing a reflection of the incident stress; estimating a stiffness of the at least one joint by estimating a force exerted on the at least one joint by the incident wave.
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