LOW FREQUENCY DISTRIBUTED ACOUSTIC SENSING
First Claim
1. A process for monitoring hydrocarbon production where the process comprises:
- a) installing one or more fiber optic cables along a wellbore in a hydrocarbon formation;
b) installing one or more interrogators on at least one fiber optic cable;
c) interrogating at least one fiber optic cable with an interrogation signal;
d) obtaining one or more datasets from the interrogator;
e) converting one or more datasets from the interrogator into a continuous record;
f) transforming the continuous record with a low-pass filter to 1-50 milliHz while down sampling the data into a transformed well signal;
g) interpreting the transformed well signal; and
h) improving hydrocarbon production from said hydrocarbon formation.
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Accused Products
Abstract
The invention relates to DAS observation has been proven to be useful for monitoring hydraulic fracturing operations. While published literature has shown focus on the high-frequency components (>1 Hz) of the data, this invention discloses that much of the usable information may reside in the very low frequency band (0-50 milliHz). Due to the large volume of a DAS dataset, an efficient workflow has been developed to process the data by utilizing the parallel computing and the data storage. The processing approach enhances the signal while decreases the data size by 10000 times, thereby enabling easier consumption by other multi-disciplinary groups for further analysis and interpretation. The polarity changes as seen from the high signal to noise ratio (SNR) low frequency DAS images are currently being utilized for interpretation of completions efficiency monitoring in hydraulically stimulated wells.
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Citations
18 Claims
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1. A process for monitoring hydrocarbon production where the process comprises:
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a) installing one or more fiber optic cables along a wellbore in a hydrocarbon formation; b) installing one or more interrogators on at least one fiber optic cable; c) interrogating at least one fiber optic cable with an interrogation signal; d) obtaining one or more datasets from the interrogator; e) converting one or more datasets from the interrogator into a continuous record; f) transforming the continuous record with a low-pass filter to 1-50 milliHz while down sampling the data into a transformed well signal; g) interpreting the transformed well signal; and h) improving hydrocarbon production from said hydrocarbon formation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of monitoring hydrocarbon production comprising, installing one or more fiber optic cables along a wellbore in a hydrocarbon formation;
- interrogating at least one fiber optic cable with an interrogator;
obtaining one or more datasets from the interrogator;
converting one or more datasets from the interrogator into a continuous record;
transforming the continuous record with a low-pass filter to 1-50 milliHz while down sampling the data into a transformed well signal;
interpreting the transformed well signal; and
monitoring hydrocarbon production from said hydrocarbon formation. - View Dependent Claims (8, 9, 10, 11, 12)
- interrogating at least one fiber optic cable with an interrogator;
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13. A method to determine the effectiveness of a hydrocarbon well treatment comprising:
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a) installing one or more fiber optic cables along a wellbore in a hydrocarbon formation; b) installing one or more interrogators on at least one fiber optic cable; c) interrogating at least one fiber optic cable with an interrogation signal before, during, and after a well treatment; d) obtaining one or more datasets from the interrogator; e) converting one or more datasets from the interrogator into a continuous record; f) transforming the continuous record with a low-pass filter to 1-50 milliHz while down sampling the data into a transformed well signal; g) interpreting the transformed well signal; and h) improving hydrocarbon production from said hydrocarbon formation. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification