System and Method for Monitoring and Controlling Underground Drilling
7 Assignments
0 Petitions
Accused Products
Abstract
A system and method for monitoring underground drilling in which vibration is monitored by creating a model of the drill string using finite element techniques or finite difference techniques and (i) predicting vibration by inputting real time values of operating parameters into the model, and then adjusting the model to agree with measured vibration data, (ii) predicting the weight on bit and drill string and mud motor speeds at which resonance will occur, as well as when stick-slip will occur, so that the operator can avoid operating regimes that will result in high vibration, (iii) determining vibration and torque levels along the length of the drill string based on the measured vibration and torque at one or more locations, (iv) determining the remaining life of critical components of the drill string based on the history of the vibration to which the components have been subjected, and (v) determining the optimum drilling parameters that will avoid excessive vibration of the drill string.
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Citations
26 Claims
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1-22. -22. (canceled)
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23. A method of monitoring the operation of a drill string having a drill bit drilling into an earthen formation, comprising the steps of:
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a) rotating said drill bit at a first rotary speed so that said drill bit forms a bore hole in said earthen formation, said drill string vibrating in a lateral vibration mode; b) generating a signal representative of said vibration of said drill string in said lateral vibration mode as said drill bit drills into said earthen formation; c) analyzing said signal so as to determine the backward whirl frequency of said vibration of said drill string in said lateral vibration mode; d) determining the diameter of said bore hole being drilled by said drill bit from said backward whirl frequency. - View Dependent Claims (24, 25)
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26-31. -31. (canceled)
Specification