Method for determining the rotation speed of a drill bit
First Claim
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1. A method for determining the rotation speed of a drill bit in a well, the bit being disposed at one end of a drill string, the other end of the drill string being set into rotation, comprising the following steps:
- measuring an axial acceleration at an arbitrary point on a drill string;
spaced away from the drill bit.determining a multiplying coefficient which depends on the position of the arbitrary point on the drill string in relation to the drill bit; and
calculating an instantaneous rotation speed of the drill bit from said measured axial acceleration and multiplying coefficient.
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Abstract
A method for determining the rotation speed of the drill bit arranged at one end of a rotating drill string. According to the method, the axial acceleration at one point on the drill string is measured, this measurement is processed with a multiplying coefficient which depends upon the point on the drill string where the measurement is taken to determine the rotational speed of the drill bit.
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5 Claims
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1. A method for determining the rotation speed of a drill bit in a well, the bit being disposed at one end of a drill string, the other end of the drill string being set into rotation, comprising the following steps:
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measuring an axial acceleration at an arbitrary point on a drill string;
spaced away from the drill bit.determining a multiplying coefficient which depends on the position of the arbitrary point on the drill string in relation to the drill bit; and calculating an instantaneous rotation speed of the drill bit from said measured axial acceleration and multiplying coefficient. - View Dependent Claims (2, 3, 4, 5)
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Specification