Downhole downlinking system employing a differential pressure transducer
First Claim
Patent Images
1. A downhole tool comprising:
- a downhole tool body including an internal through bore;
a downlinking system deployed in the tool body, the downlinking system including a differential transducer deployed in a longitudinal bore in a pressure housing, the differential transducer disposed to measure a pressure difference between drilling fluid in the through bore and drilling fluid external to the tool in a borehole annulus, the downlinking system further including a pressure tight bulkhead deployed in the longitudinal bore, the bulkhead being electrically connected with the differential transducer.
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Abstract
A downhole tool includes a downlinking system deployed in a downhole tool body having an internal through bore. The downlinking system includes a differential pressure transducer configured to measured a pressure difference between drilling fluid in the internal through bore and drilling fluid external to the tool (in the borehole annulus). The differential transducer is electrically connected with an electronic controller (deployed substantially anywhere in the drill string) that is configured to receive and decode pressure waveforms.
32 Citations
18 Claims
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1. A downhole tool comprising:
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a downhole tool body including an internal through bore; a downlinking system deployed in the tool body, the downlinking system including a differential transducer deployed in a longitudinal bore in a pressure housing, the differential transducer disposed to measure a pressure difference between drilling fluid in the through bore and drilling fluid external to the tool in a borehole annulus, the downlinking system further including a pressure tight bulkhead deployed in the longitudinal bore, the bulkhead being electrically connected with the differential transducer. - View Dependent Claims (2, 3, 4, 5)
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6. A downhole tool comprising:
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a downhole tool body including an internal through bore; a pressure housing deployed on the tool body; a differential transducer deployed in the pressure housing, the differential transducer having first and second sides, the first side of the differential transducer being in fluid communication with drilling fluid in the through bore; a compensating piston deployed in a cavity in the pressure housing, the piston and the cavity defining first and second fluid chambers, the first fluid chamber being in fluid communication with drilling fluid external to the tool in a borehole annulus, the second fluid chamber being in fluid communication with the second side of the differential transducer; and wherein a first bore formed in the tool body and a second bore formed in the pressure housing provide the fluid communication between the through bore and the first side of the differential transducer. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A string of downhole tools comprising:
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a downhole steering tool including an electronic controller; and a downhole sub connected to the steering tool, the sub including; a downhole tool body including an internal through bore; a pressure housing deployed on the tool body; a differential transducer deployed a longitudinal bore in the pressure housing, the differential transducer having first and second sides, the first side of the differential transducer being in fluid communication with drilling fluid in the through bore, the differential transducer being in electrical communication with the controller; a compensating piston deployed in a cavity in the pressure housing, the piston and the cavity defining first and second fluid chambers, the first fluid chamber being in fluid communication with drilling fluid external to the tool in a borehole annulus, the second fluid chamber being in fluid communication with the second side of the differential transducer; and wherein the tool further comprises a pressure tight bulkhead deployed in the longitudinal bore, a first end of the bulkhead being connected with the differential transducer, a second end of the bulkhead being electrically connected with the controller. - View Dependent Claims (14, 15, 16, 17)
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18. A downhole tool comprising:
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a downhole tool body including an internal through bore; a pressure housing deployed on the tool body; a differential transducer deployed in the pressure housing, the differential transducer having first and second sides, the first side of the differential transducer being in fluid communication with drilling fluid in the through bore; a compensating piston deployed in a cavity in the pressure housing, the piston and the cavity defining first and second fluid chambers, the first fluid chamber being in fluid communication with drilling fluid external to the tool in a borehole annulus, the second fluid chamber being in fluid communication with the second side of the differential transducer; and wherein at least one bore formed in the pressure housing provides the fluid communication between the second fluid chamber and the second side of the differential transducer.
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Specification