Resolution enhancement for subterranean well distributed optical measurements
First Claim
1. A method of enhancing resolution of distributed temperature measurements along a wellbore in a subterranean well, the method comprising:
- acquiring optical signals during at least a first acquisition time period using an optical waveguide extending longitudinally through the wellbore, thereby producing a first distributed temperature measurement profile along a first longitudinal section of the wellbore, wherein the first distributed temperature measurement profile is a convolution of first and second functions; and
deconvolving the first distributed temperature measurement profile using the first function, thereby determining the second function, wherein the first function describes a velocity of fluid along the first longitudinal section of the wellbore and the second function describes a temperature distribution shape along the first longitudinal section of the wellbore.
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Abstract
Enhancing resolution of distributed optical measurements along a wellbore can include acquiring optical signals during an acquisition time period, thereby producing a convolved profile along the wellbore, and deconvolving the profile using a first function corresponding to the acquisition time period, thereby determining a second function. Another method of enhancing resolution of distributed temperature measurements along a wellbore can include acquiring optical backscatter signals during at least first and second acquisition time periods, thereby producing respective first and second convolved temperature profiles along the wellbore; deconvolving the first temperature profile using a first function corresponding to the first time period, thereby determining a second function; and deconvolving the second temperature profile using the second function, thereby determining the first function corresponding to the second time period.
161 Citations
16 Claims
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1. A method of enhancing resolution of distributed temperature measurements along a wellbore in a subterranean well, the method comprising:
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acquiring optical signals during at least a first acquisition time period using an optical waveguide extending longitudinally through the wellbore, thereby producing a first distributed temperature measurement profile along a first longitudinal section of the wellbore, wherein the first distributed temperature measurement profile is a convolution of first and second functions; and deconvolving the first distributed temperature measurement profile using the first function, thereby determining the second function, wherein the first function describes a velocity of fluid along the first longitudinal section of the wellbore and the second function describes a temperature distribution shape along the first longitudinal section of the wellbore. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of enhancing resolution of distributed temperature measurements along a wellbore in a subterranean well, the method comprising:
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acquiring optical signals during at least first and second acquisition time periods using an optical waveguide extending longitudinally through the wellbore, thereby producing respective first and second distributed temperature measurement profiles along respective first and second longitudinal sections of the wellbore; deconvolving the first distributed temperature measurement profile using a first function corresponding to the first acquisition time period, thereby determining a second function corresponding to the first acquisition time period, wherein the first function is known in the deconvolving of the first distributed temperature measurement profile, and wherein the second function describes a temperature distribution shape along the first longitudinal section of the wellbore; and deconvolving the second distributed temperature measurement profile using the determined second function, thereby determining a third function which describes a velocity of fluid along the second longitudinal section of the wellbore during the second acquisition time period. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification