Gauge length optimization in distributed vibration sensing
AssigneeSchlumberger Technology Corporation
InventorsTimothy DEAN, Theo CUNY, Arthur HARTOG
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Abstract
A technique facilitates the use and application of a distributed vibration sensing system in, for example, a well application. The technique enables selection of a desired gauge length to achieve an optimum trade-off between the spatial resolution of a distributed vibration sensing/distributed acoustic sensing system and signal-to-noise ratio. The optimum gauge length can vary according to specific factors, e.g. depth within a well, and the present technique can be used to account for such factors in selecting an optimal gauge length which facilitates accurate collection of data on dynamic strain.
Claims20
A method for use in a well, comprising:
- deploying an optical fiber along a well system;
- positioning the well system in a wellbore;
- connecting the optical fiber into a distributed vibration sensing system;
- employing the optical fiber to measure signals indicative of vibrations incurred along the well system;
- and
- using a wavelength of interest in the signals to be detected to select a suitable range of gauge length values for a desired portion of the optical fiber.
A method, comprising:
- deploying a distributed vibration sensing system to detect dynamic strain along an optical fiber;
- and
- using a wavelength of interest in a signal causing the dynamic strain to select an optimal gauge length value for a portion of the optical fiber.
A method, comprising:
- deploying a distributed vibration sensing system to detect dynamic strain along an optical fiber;
- making a preliminary measurement and signal extraction using a pre-defined and non-optimized gauge length to establish preliminary gauge length data;
- and
- using the preliminary gauge length data and a wavelength of interest in a signal causing the dynamic strain to select an optimal gauge length value for a portion of the optical fiber.
Dependencies are inferred from the claim text.