Monitoring Drilling Performance in a Sub-Based Unit
First Claim
Patent Images
1. An apparatus for use in a wellbore, the apparatus comprising:
- a bottomhole assembly (BHA) coupled to drilling tubular conveyable into the wellbore, the BHA including a drillbit configured to drill an earth formation; and
at least one removable sub in the drill string, the sub including a body having a pin end, a box end, and at least one sensor configured to make a measurement indicative of a downhole condition, the at least one sensor being disposed in a pressure-sealed chamber in the body.
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Abstract
In one aspect, a removable module or sub is provided for use in drilling a wellbore, which sub in one embodiment may include a body having a pin end and a box end configured for coupling between two members of a drill string, the body having a bore therethrough for flow of a fluid, and a sensor disposed in a pressure-sealed chamber in one of the pin end and the box end and configured to provide measurements relating to a downhole condition.
93 Citations
19 Claims
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1. An apparatus for use in a wellbore, the apparatus comprising:
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a bottomhole assembly (BHA) coupled to drilling tubular conveyable into the wellbore, the BHA including a drillbit configured to drill an earth formation; and at least one removable sub in the drill string, the sub including a body having a pin end, a box end, and at least one sensor configured to make a measurement indicative of a downhole condition, the at least one sensor being disposed in a pressure-sealed chamber in the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for estimating a downhole condition, the method comprising:
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providing a removable sub at a selected location in a drilling apparatus, wherein the removable sub includes a sensor in a pressure-sealed chamber, the removable sub further including a bore for flow of a fluid therethrough; making measurements using the sensor indicative of a downhole condition; and and processing the measurements from the sensor to estimate the downhole condition. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A sub for use in a drill string for drilling a wellbore, comprising:
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a body having a pin end and a box end, each end configured for coupling to a member of a drill string, the body having a bore therethrough for flow of a fluid; a sensor disposed in a pressure-sealed chamber in one of (i) the pin end;
(ii) the box end, the sensor configured to provide measurements relating to a downhole condition. - View Dependent Claims (19)
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18. The sub of claim 18, wherein the measurements relate to one of:
- (i) acceleration, (ii) rotational speed (RPM), (iii) weight on bit (WOB), (iv) torque, (v) vibration, (vi) oscillation, (vii) acceleration, (viii) stick-slip, (ix) whirl, (x) strain, (xi) bending, (xii) temperature, and (xiii) pressure.
Specification