Systems and methods for distributed pressure sensing
a distributed pressure and sensing technology, applied in the direction of optical fibres with polarisation, instruments, force measurement by measuring optical property variation, etc., can solve the problems of many devices not being suitable for use in higher temperature environments, limiting the number of locations for which pressure may be determined, and many devices being difficult to achiev
Active Publication Date: 2016-01-21
BAKER HUGHES INC
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Problems solved by technology
However, numerous locations present challenges to many of these devices.
For example, many devices may not be appropriate for use in higher temperature environments, such as geothermal wells, oil wells, or the like.
However, the process of packaging and splicing sensors along a cable places practical limits on the numbers of pressure sensors along the length of the cable, and accordingly limits the numbers of locations for which pressure may be determined.
The splicing of sensors into the cable and / or the use of transduced axial strain increases the cost, complexity, and / or instrumentation of distributed pressure sensing.
Conventional approaches may also provide reduced resolution and / or present additional or alternative drawbacks.
However, distributed pressure measurements (e.g., continuous or nearly continuous measurement of pressure along a length of a cable) may not be able to be made in the same manner.
Method used
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[0018]Various embodiments will be better understood when read in conjunction with the appended drawings. To the extent that the figures illustrate diagrams of the functional blocks of various embodiments, the functional blocks are not necessarily indicative of the division between hardware circuitry. Thus, for example, one or more of the functional blocks (e.g., processors, controllers or memories) may be implemented in a single piece of hardware (e.g., a general purpose signal processor or random access memory, hard disk, or the like) or multiple pieces of hardware. Similarly, any programs may be stand-alone programs, may be incorporated as subroutines in an operating system, may be functions in an installed software package, and the like. It should be understood that the various embodiments are not limited to the arrangements and instrumentality shown in the drawings.
[0019]As used herein, the terms “system,”“unit,” or “module” may include a hardware and / or software system that ope...
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Abstract
A pressure sensing cable in one embodiment includes an optical fiber having a first core and a second core. The first core extends along a length of the cable, and is sized and configured to provide propagation of light along the first core along the length of the cable. The first core has a first mode index corresponding to the speed of light propagation along the first core. The second core extends along the length, is spaced a distance from the first core, and is sized and configured to provide propagation of light along the second core along the length of the cable. The second core has a second mode index corresponding to the speed of light propagation along the second core. The second mode index is different from the first mode index, wherein light propagates along the second core at a different speed than along the first core.
Description
BACKGROUND[0001]Various devices have been developed for measuring environmental conditions of a given location, such as temperature or pressure. However, numerous locations present challenges to many of these devices. For example, many devices may not be appropriate for use in higher temperature environments, such as geothermal wells, oil wells, or the like.[0002]Certain conventional down-hole sensing techniques (e.g., for oil, gas, or geothermal applications) use distributed strain, temperature, and / or acoustic sensing. Pressure sensing along the length of a cable (or along the depth of a well or hole) may be performed using separately packaged sensors that are spliced along a length of a cable. For example, hydrostatic pressure may be transduced into longitudinal strain along an axis of the sensor, with the longitudinal strain used in determining pressure. However, the process of packaging and splicing sensors along a cable places practical limits on the numbers of pressure sensor...
Claims
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IPC IPC(8): G01L1/24G01M11/00
CPCG01M11/31G01L1/246G01L11/025G02B6/02042G02B6/022G02B6/02328G02B6/02347G02B6/024G02B2006/12138G01D5/35316G01D5/3538G01L1/242H01B9/005
Inventor CHALLENER, WILLIAM ALBERTPALIT, SABAMI
Owner BAKER HUGHES INC