Structure and method for pulse telemetry
AssigneeHalliburton Energy Services, Inc.
InventorsCili Sun, Laban M. Marsh, Bipin K. Pillai
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Abstract
A mud pulse telemetry technique that uses a number of bits per interval based on parameters of the pulse position modulation system in order to reduce data transfer time in a pulse position modulation system. More particularly, depending on parameters of the pulse position modulation such as the minimum-time and the bit-width, it may be possible to decrease overall transmission time by splitting values having a larger number of bits into multiple transmissions with each transmission having a smaller number of bits.
Claims42
A method of pulse telemetry using pulse position modulation comprising:
- sending a long interval, the long interval having encoded therein a value greater than a maximum value for short intervals;
- sending a plurality of short intervals, each of the plurality of short intervals having encoded therein a number of bits;
- and
- wherein the number of bits encoded in each of the plurality of short intervals is less than a number of parity bits.
A pulse telemetry system comprising:
- an assembly adapted to create pressure pulses in drilling fluid, data in the pressure pulses encoded using pulse position modulation;
- a signal processor coupled to a pressure sensor, the signal processor and pressure sensor adapted to detect pressure pulses in the drilling fluid and to decode the data;
- and
- wherein the assembly is adapted to send the data in groupings of intervals, a synchronizing interval of a grouping having encoded therein a value greater than a maximum value of each of a plurality of short intervals, and wherein a number of data bits encoded in each of the plurality of short intervals is less than a number of parity bits.
In a pulse position modulation based pulse telemetry system using a minimum time between pulses to define a data value zero, and a series of time windows defining a bit width within which a pulse may fall to represent a data value, a method of operating the pulse telemetry system comprising:
- sending a first interval having encoded therein a first interval value;
- sending a plurality of intervals, a number of bits encoded in each of the plurality of intervals selected such that an average of possible values for the number of bits encoded multiplied by the bit width is approximately half the minimum time;
- and
- wherein the first interval value is greater than a maximum data value of the plurality of intervals for the number of bits selected.
Dependencies are inferred from the claim text.