Systems and methods for likelihood-based detection of gas leaks using mobile survey equipment
First Claim
1. A method comprising employing at least one processor to:
- identify a first gas emission plume event according to a first set of gas emission data resulting from a first mobile measurement run performed by a mobile measurement device along a first measurement path, the first set of gas emission data reflecting a first set of gas concentration data acquired during the first mobile measurement run and a first set of associated atmospheric condition data characterizing the first mobile measurement run;
generate a prior 2-D surface map of gas emission source probabilities according to the first set of gas emission data;
receive a second set of gas emission data resulting from a second mobile measurement run, the second set of gas emission data reflecting a second set of gas concentration data acquired during the second mobile measurement run; and
update the prior 2-D surface map to generate a posterior 2-D surface map of gas emission source probabilities according to the second set of gas emission data, wherein generating the posterior 2-D surface map comprises determining an updated probability of a gas emission source being present at a given location according to a product of a prior probability of the gas emission source being present at the given location and a probability of observing the second set of gas emission data given the gas emission source being present at the given location.
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Abstract
In some embodiments, vehicle-based natural gas leak detection methods are used to generate 2-D spatial distributions (heat maps) of gas emission source probabilities and surveyed area locations using measured gas concentrations and associated geospatial (e.g. GPS) locations, wind direction and wind speed, and atmospheric condition data. Bayesian updates are used to incorporate the results of one or more measurement runs into computed spatial distributions. Operating in gas-emission plume space rather than raw concentration data space allows reducing the computational complexity of updating gas emission source probability heat maps. Gas pipeline location data and other external data may be used to determine the heat map data.
58 Citations
22 Claims
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1. A method comprising employing at least one processor to:
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identify a first gas emission plume event according to a first set of gas emission data resulting from a first mobile measurement run performed by a mobile measurement device along a first measurement path, the first set of gas emission data reflecting a first set of gas concentration data acquired during the first mobile measurement run and a first set of associated atmospheric condition data characterizing the first mobile measurement run; generate a prior 2-D surface map of gas emission source probabilities according to the first set of gas emission data; receive a second set of gas emission data resulting from a second mobile measurement run, the second set of gas emission data reflecting a second set of gas concentration data acquired during the second mobile measurement run; and update the prior 2-D surface map to generate a posterior 2-D surface map of gas emission source probabilities according to the second set of gas emission data, wherein generating the posterior 2-D surface map comprises determining an updated probability of a gas emission source being present at a given location according to a product of a prior probability of the gas emission source being present at the given location and a probability of observing the second set of gas emission data given the gas emission source being present at the given location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A non-transitory computer-readable medium encoding instructions which, when executed by a computer system comprising at least one processor, cause the at least one processor to:
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identify a first gas emission plume event according to a first set of gas emission data resulting from a first mobile measurement run performed by a mobile measurement device along a first measurement path, the first set of gas emission data reflecting a first set of gas concentration data acquired during the first mobile measurement run and a first set of associated atmospheric condition data characterizing the first mobile measurement run; generate a prior 2-D surface map of gas emission source probabilities according to the first set of gas emission data; receive a second set of gas emission data resulting from a second mobile measurement run, the second set of gas emission data reflecting a second set of gas concentration data acquired during the second mobile measurement run; and update the prior 2-D surface map to generate a posterior 2-D surface map of gas emission source probabilities according to the second set of gas emission data, wherein generating the posterior 2-D surface map comprises determining an updated probability of a gas emission source being present at a given location according to a product of a prior probability of the gas emission source being present at the given location and a probability of observing the second set of gas emission data given the gas emission source being present at the given location. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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12. A computer system comprising at least one processor configured to:
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identify a first gas emission plume event according to a first set of gas emission data resulting from a first mobile measurement run performed by a mobile measurement device along a first measurement path, the first set of gas emission data reflecting a first set of gas concentration data acquired during the first mobile measurement run and a first set of associated atmospheric condition data characterizing the first mobile measurement run; generate a prior 2-D surface map of gas emission source probabilities according to the first set of gas emission data; receive a second set of gas emission data resulting from a second mobile measurement run, the second set of gas emission data reflecting a second set of gas concentration data acquired during the second mobile measurement run; and update the prior 2-D surface map to generate a posterior 2-D surface map of gas emission source probabilities according to the second set of gas emission data, wherein generating the posterior 2-D surface map comprises determining an updated probability of a gas emission source being present at a given location according to a product of a prior probability of the gas emission source being present at the given location and a probability of observing the second set of gas emission data given the gas emission source being present at the given location.
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13. A non-transitory computer-readable medium encoding instructions which, when executed by a computer system comprising at least one processor, cause the at least one processor to:
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receive a prior 2-D surface map of gas emission source probabilities; identify a first gas emission plume event according to a first set of gas emission data resulting from a first mobile measurement run performed by a mobile measurement device along a first measurement path, the first set of gas emission data reflecting a first set of gas concentration data acquired during the first mobile measurement run and a first set of associated atmospheric condition data characterizing the first mobile measurement run; and selectively employ data characterizing the identified first gas emission plume event to update the prior 2-D surface map to generate a posterior 2-D surface map of gas emission source probabilities by determining an updated probability of a gas emission source being present at a given location according to a product of a prior probability of the gas emission source being present at the given location and a probability of observing the data characterizing the identified first gas emission plume event given the gas emission source being present at the given location.
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Specification