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US 7,068,182 B2Granted
Method and apparatus for mud pulse telemetry
AssigneeHalliburton Energy Services, Inc.
InventorsChristopher A. Golla, Laban M. Marsh, Paul F. Rodney, Cili Sun, Bipin K. Pillai, Paul D. Beene
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Abstract
A method and related apparatus for telemetry between downhole devices and surface devices. In particular, the methods and related apparatus may send a first datum of a first parameter in an uncompressed form, and send a second datum of the first parameter in compressed form.
Claims47
A method comprising:
- sending a first datum of a first parameter in uncompressed form from a downhole unit within a drill string to a surface unit;
- and
- sending a second datum of the first parameter in compressed form from the downhole unit within the drill string to the surface unit by sending a first delta value being a difference between the first and second datum;
- and
- reconstructing the second datum from the first datum and the first delta value.
2 more elements
A drill string assembly comprising:
- a downhole tool designed to generate a first datum and a second datum being one of drilling parameters, borehole parameters or formation properties;
- a communication system coupled to the downhole tool, the communication system adapted to communicate to a surface device;
- and
- wherein the communication system is adapted to send the first datum to the surface device in uncompressed form, and wherein the communication system is further adapted to send the second datum to the surface device in a compressed form as a difference between the first and second datum.
1 more element
A method comprising:
- sending a first list from a downhole device within a drill string to a surface unit, the first list comprising a first value, in uncompressed form, of a downhole parameter;
- and
- sending a second list through the downhole device within a drill string to the surface unit, the second list comprising a second value, in compressed form, of the downhole parameter, the second value related to the first value.
A method comprising:
- sending an first list from a downhole unit within a drill string to a surface computer, the first list comprising a first datum in uncompressed form and a second datum in uncompressed form;
- and
- sending a second list from the downhole unit within the drill string to the surface computer, the second list comprising third datum related to the first datum and a fourth datum related to the second datum, and wherein at least one of the third and fourth datum is in a compressed format.
A method comprising:
- sending a first list from a downhole device within a drill string to a surface computer, the first list containing an uncompressed value of the downhole parameter list, and at least one compressed value of the downhole parameter;
- and
- calculating the compressed value of the downhole parameter as the difference between the uncompressed value and a value of a datum to be compressed.
A method comprising:
- sending an uncompressed value of a first parameter in a first list;
- sending an uncompressed value of a first parameter in a second list;
- and
- sending a plurality of compressed values in a third list;
- AND
- calculating the uncompressed values of the compressed values in the third list using one of the uncompressed value in the first list and the uncompressed value in the second list.
3 more elements
Dependencies are inferred from the claim text.