GB2454220A - Detecting strain in structures - Google Patents

Detecting strain in structures Download PDF

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Publication number
GB2454220A
GB2454220A GB0721436A GB0721436A GB2454220A GB 2454220 A GB2454220 A GB 2454220A GB 0721436 A GB0721436 A GB 0721436A GB 0721436 A GB0721436 A GB 0721436A GB 2454220 A GB2454220 A GB 2454220A
Authority
GB
United Kingdom
Prior art keywords
clamp
sensor
strain
perimeter
attached
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0721436A
Other versions
GB2454220B (en
GB0721436D0 (en
Inventor
Rogerio Ramos
Damon Richard Roberts
Stephane Vannuffelen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gemalto Terminals Ltd
Schlumberger Holdings Ltd
Original Assignee
Gemalto Terminals Ltd
Schlumberger Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gemalto Terminals Ltd, Schlumberger Holdings Ltd filed Critical Gemalto Terminals Ltd
Priority to GB0721436.4A priority Critical patent/GB2454220B/en
Publication of GB0721436D0 publication Critical patent/GB0721436D0/en
Priority to PCT/GB2008/003700 priority patent/WO2009056853A1/en
Publication of GB2454220A publication Critical patent/GB2454220A/en
Application granted granted Critical
Publication of GB2454220B publication Critical patent/GB2454220B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0001—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means
    • G01L9/0007—Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means using photoelectric means
    • E21B47/0006—
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/007—Measuring stresses in a pipe string or casing
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/08—Measuring diameters or related dimensions at the borehole
    • E21B47/124—
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/26—Storing data down-hole, e.g. in a memory or on a record carrier
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
    • G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
    • G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
    • G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines

Landscapes

  • Physics & Mathematics (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

An apparatus for monitoring physical parameters of a structure, comprises a clamp 11 that in use is placed to embrace the structure to be monitored; and a strain sensor 13 attached to the clamp and arranged so as to detect strain in the direction of the perimeter of the structure. A method of monitoring a structure, comprises placing a clamp to embrace the structure to be monitored, the clamp having a strain sensor attached thereto; and collecting information from the strain sensor attached to the clamp placed in order to detect strain in the direction of the perimeter of the structure. The strain sensor may be an optical fibre Bragg grating sensor. The structure may be an oil or gas pipe or a subsea structure such as a subsea riser.

Description

Description
APPARATUS AND METHODS FOR DETECTING STRAIN IN STRUCTURES
Technical Field
[0001] This invention relates to apparatus and methods for detecting strain in structures. In particular, it relates to strain detection in structures such as oil and gas pipes and supporting structures in oil and gas installations or the like.
Background Art
[0002] The area of concern for this invention is the monitoring of structures by measuring strain. More specifically, the measurement of strain in order to infer the perimeter of a structure as it changes with time, temperature, pressure or any other parameter.
[0003] The monitoring of structures is of great importance in many areas, in particular in the oil and gas industry, even more important in sub sea environment where access to the structures is difficult. For example, a pipeline running at the sea bed between an offshore production location to a transportation hub may need to be monitored to provide information on the perimeter of the pipe in order to estimate internal pressure.
Disclosure of Invention
[0004] A first aspect of the invention provides an apparatus for monitoring physical parameters of a structure, comprising: -a clamp that in use is placed to embrace the structure to be monitored; and -a strain sensor attached to the clamp an arranged so as to detect strain in the direction of the perimeter of the structure, preferably around the periphery of the structure.
[0005] The clamp can be a strap or belt or a compliant material, and may be shaped to the outside shape of the structure. In a preferred embodiment, the clamp is made using composite material. The strain sensor can embedded into the clamp in one preferred embodiment.
[0006] The sensor may comprise an optical sensor such as an optical fibre sensor, for example a fibre Bragg grating based sensor, an interferometric sensor, or the like.
[0007] The structure to which the apparatus is applied is typically a pipe or tube, such an oil and/or gas pipe, or a water pipe. The structure may also be a sub sea structure such as a sub sea riser.
[0008] The structure may be located below the surface and may be totally or partially buried.
[0009] A data collection unit may also be attached to the structure or the clamp.
The data collection unit can include an optical interrogation unit operating, for example, by means of spectrum analysis.
[0010] A second aspect of the invention provides a method of monitoring a structure, comprising: -placing a clamp to embrace the structure to be monitored, the clamp having a strain sensor attached thereto; and -collecting information from the strain sensor attached to the clamp placed in order to detect strain in the direction of the perimeter of the structure.
[0011] The strain information may be used to calculate the perimeter dimensions of the structure, the temperature of the structure, the outer pressure of the structure, or the inner pressure of the structure.
[0012] Further aspects of the invention will be apparent from the following
description.
Brief Description of Figures in the Drawings
[0013] Figure 1 shows one embodiment of an apparatus according to the invention; Figure 2 shows an embodiment of the invention installed on a structure to be monitored; and Figure 3 shows a flow chart of a method according to an embodiment of the invention.
Mode(s) for Carrying Out the Invention [0014] Referring now to Figure 1, the embodiment of the invention shown therein comprises a ring-type clamp 11, typically made out of a composite material. In this embodiment, the clamp 11 is formed in two semicircular halves secured together using a securing system 12. In this case, the securing system comprises two nut and bolt arrangements on opposite sides of the clamp. Other releasable securing systems can also be used 3/ and it is also possible to replace one securing system with a hinge. The shape of the claim 11 in Figure 1 is circular, although other shapes can be used depending on the shape of the structure to be monitored.
[0015] A strain sensor 13 is located on the clamp 11 or imbedded into the clamp material (as is shown in Figure 1). In one possible embodiment, the clamp 11 is made of composite material and the sensor 13 is an optical fibre Bragg grating sensor. By providing the clamp 11 with a sensor that measures strain, securing the clamp 11 to a structure to be monitored, for example a pipe or tube, such an oil and/or gas pipe, or a water pipe, or a sub sea structure such as a sub sea riser, means that strain imposed on the clamp 11 by the structure can in turn be measured by the sensor 13.
The direction of the strain measured will depend on the configuration of the clamp. In the embodiment of Figure 1, the sensor 13 will measure the tangential strain in the clamp 11 which in turn is created by the behaviour of the structure at its periphery or perimeter where the clamp is located.
[0016] Figure 2 shows a clamp 31 attached to a structure 32 such as a pipe. A data collection unit 33 is also be attached to the structure 32 by means of further clamps or other locating devices and connected to the sensor in the clamp 31 by a cable 34. The data collection unit can include a battery or other power source or can be connected to a power source by means of a cable. Likewise, data stored in the unit 33 can be delivered to a processing system directly via a cable, or by periodically downloading the data via a wireless link in response to interrogation by a reader.
[0017] Figure 3 shows a flow diagram of the steps in a method according to one embodiment of the invention to calculate internal pressure of a structure, such as a pipe line, using the clamped system of Figure 2 using a fibre Bragg grating sensor. In a first step 40, data is collected from the sensor referenced to a centre wavelength of the fibre Bragg grating mounted in the clamp. This approach has been used in other fibre Bragg grating devices.
[0018] The data is then translated from the centre-wavelength referenced data into a strain measurement (42). This can be done in one of a number of known ways, dependent on the exact form and orientation of sensor used.
The strain measurement can then in turn be used to calculate the hoop strain on the clamp (44) and from this the perimeter dimensions of the structure beneath the clamp can be determined (46), knowing the dimensions of the clamp and using the known physical properties of the clamp material and structure. Finally, by knowing the physical structure of the pipe and its material properties, and its environment, the internal pressure of the pipe can be calculated (48). Other properties such as the temperature of the structure, the outer pressure of the structure can also be calculated from this data.
[0019] Steps 42-48 can be performed in a processing unit remote from the structure and sensor if desired. Also, a series of measurement over time can be made to determine time-varying properties of the pipe or other structure being monitored.
[0020] Changes can be made while remaining within the scope of the invention.
For example, multiple sensors can be provided in a single clamp. Also, multiple clamps can be provided spaced along the structure of interest. 5.

Claims (21)

  1. Claims 1. An apparatus for monitoring physical parameters of a structure, comprising: -a clamp that in use is placed to embrace the structure to be monitored; and -a strain sensor attached to the clamp an arranged so as to detect strain in the direction of the perimeter of the structure.
  2. 2. Apparatus as claimed in claim 1, wherein the sensor detects strain around the periphery of the structure.
  3. 3. Apparatus as claimed in claim 1 or 2, wherein clamp is a strap or belt or a compliant material.
  4. 4. Apparatus as claimed in claim 1, 2 or 3, wherein the clamp is shaped to the outside shape of the structure.
  5. 5. Apparatus as claimed in any preceding claim, wherein the clamp is made using composite material.
  6. 6. Apparatus as claimed in any preceding claim, wherein strain sensor is embedded into the clamp.
  7. 7. Apparatus as claimed in any preceding claim, wherein the sensor comprises an optical sensor.
  8. 8. Apparatus as claimed in claim 7, wherein the sensor is an optical fibre sensor.
  9. 9. Apparatus as claimed in claim 8, wherein the optical fibre sensor comprises a fibre Bragg grating based sensor, or any other interferometric sensor.
  10. 10. Apparatus as claimed in any preceding claim, wherein the structure to which the apparatus is applied is a pipe or tube.
  11. 11. Apparatus as claimed in claim 10, wherein the structure is an oil, gas pipe and/or water pipe.
  12. 12. Apparatus as claimed in any of claims 1-9, wherein structure is a sub sea structure.
  13. 13. Apparatus as claimed in claim 12, wherein the structure is a sub sea riser.
  14. 14. Apparatus as claimed in any preceding claim, wherein the structure is located below the surface.
  15. 15. Apparatus as claimed in any preceding claim, wherein the structure is totally or partially buried.
  16. 16. Apparatus as claimed in any preceding claim, wherein a data collection unit is attached to the structure or the clamp.
  17. 17. Apparatus as claimed in claim 16, wherein the data collection unit includes an optical interrogation unit.
  18. 18. Apparatus as claimed in claim 17, wherein the optical interrogation unit operates by means of spectrum analysis.
  19. 19. A method of monitoring a structure, comprising: -placing a clamp to embrace the structure to be monitored, the clamp having a strain sensor attached thereto; and -collecting information from the strain sensor attached to the clamp placed in order to detect strain in the direction of the perimeter of the structure.
  20. 20. A method as claimed in claim 19, comprising using the strain information to calculate the perimeter dimensions of the structure, the temperature of the structure, the outer pressure of the structure, or the inner pressure of the structure.
  21. 21. A method as claimed in claim 19 or 20 wherein the clamp comprises an apparatus as claimed in any of claims 1-18.
GB0721436.4A 2007-11-01 2007-11-01 Apparatus and methods for detecting strain in structures Active GB2454220B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0721436.4A GB2454220B (en) 2007-11-01 2007-11-01 Apparatus and methods for detecting strain in structures
PCT/GB2008/003700 WO2009056853A1 (en) 2007-11-01 2008-10-31 Apparatus and methods for detecting strain in structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0721436.4A GB2454220B (en) 2007-11-01 2007-11-01 Apparatus and methods for detecting strain in structures

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GB0721436D0 GB0721436D0 (en) 2007-12-12
GB2454220A true GB2454220A (en) 2009-05-06
GB2454220B GB2454220B (en) 2012-05-23

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WO (1) WO2009056853A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2457277B (en) * 2008-02-08 2010-10-13 Schlumberger Holdings Methods and apparatus for detecting strain in structures
WO2014031008A1 (en) * 2012-08-24 2014-02-27 Depro As Clamp provided with a tension gauge and use of a tension gauge on a clamp
US20140251020A1 (en) * 2013-03-05 2014-09-11 Ge-Hitachi Nuclear Energy Americas Llc Method and apparatus for pipe pressure measurements
CN104500035A (en) * 2014-12-09 2015-04-08 中国石油天然气集团公司 Method for improving precision of on-line stress detection data of underground casing string distributive optical fiber
EP3004831A4 (en) * 2013-06-06 2016-10-12 Advanced Sensor Design Technologies Llc Apparatus and methods for measurement of pressure
US9512711B2 (en) 2014-02-24 2016-12-06 Halliburton Energy Services, Inc. Portable attachment of fiber optic sensing loop
US9512714B2 (en) 2013-12-27 2016-12-06 Halliburton Energy Services, Inc. Mounting bracket for strain sensor
WO2017125105A1 (en) * 2016-01-20 2017-07-27 Schaeffler Technologies AG & Co. KG Measuring arrangement for force or torque measurement for a machine element and machine element arrangement comprising a measuring arrangement of this type
US9746386B2 (en) 2013-06-06 2017-08-29 Advanced Sensor Design Technologies, LLC Apparatus and methods for measurements of pressure
GB2548985A (en) * 2016-03-18 2017-10-04 Schlumberger Technology Bv Along tool string deployed sensors

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2811111A1 (en) 2013-06-05 2014-12-10 ETH Zurich Method and device for measuring pressure exerted by earth material
CN105890534B (en) * 2015-01-19 2019-01-11 中国计量学院 A kind of high temperature pressure pipeline outer wall strain guide rod fiber-optic grating sensor part
BR102018016953A2 (en) * 2018-08-18 2020-03-10 Monflex Tec Engenharia De Integridade Ltda SYSTEM FOR MONITORING INTEGRITY OF RISERS AND MARITIME STRUCTURES THROUGH DEFORMATION SENSORS INSTALLED BY CLAMPS, AND INSTALLATION AND CALIBRATION METHOD OF PRE-TENSION DEFORMATION SENSORS FOR MONITORING INTEGRITY OF RISERS.
CN115014612B (en) * 2022-06-29 2024-02-02 马鞍山钢铁股份有限公司 Pipeline real-time stress adjusting method

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GB2435782A (en) * 2004-12-16 2007-09-05 Insensys Oil & Gas Ltd Structural joint strain monitoring apparatus and system
WO2008047171A1 (en) * 2006-10-20 2008-04-24 Schlumberger Holdings Ltd Elongate structure curvature sensing device

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Publication number Priority date Publication date Assignee Title
GB1352822A (en) * 1972-02-04 1974-05-15 Upjohn Co Strain gauges
US3864968A (en) * 1973-05-14 1975-02-11 Schlumberger Technology Corp Force-measuring apparatus for use in a well bore pipe string
GB1467344A (en) * 1974-01-02 1977-03-16 Cardiac Resuscitator Corp Life sign monitoring apparatus
WO2000000793A1 (en) * 1998-06-26 2000-01-06 Cidra Corporation Fluid parameter measurement in pipes using acoustic pressures
GB2402478A (en) * 2003-05-19 2004-12-08 Weatherford Lamb Well casing integrity monitoring system
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GB2435782A (en) * 2004-12-16 2007-09-05 Insensys Oil & Gas Ltd Structural joint strain monitoring apparatus and system
WO2008047171A1 (en) * 2006-10-20 2008-04-24 Schlumberger Holdings Ltd Elongate structure curvature sensing device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2457277B (en) * 2008-02-08 2010-10-13 Schlumberger Holdings Methods and apparatus for detecting strain in structures
AU2017202291B2 (en) * 2012-08-24 2018-08-30 Depro As Pipe clamp provided with a tension gauge and use of a tension gauge on a pipe clamp
WO2014031008A1 (en) * 2012-08-24 2014-02-27 Depro As Clamp provided with a tension gauge and use of a tension gauge on a clamp
US9939085B2 (en) 2012-08-24 2018-04-10 Depro As Pipe clamp provided with a tension gauge and use of a tension gauge on a pipe clamp
US20140251020A1 (en) * 2013-03-05 2014-09-11 Ge-Hitachi Nuclear Energy Americas Llc Method and apparatus for pipe pressure measurements
WO2014189577A1 (en) * 2013-03-05 2014-11-27 Ge-Hitachi Nuclear Energy Americas Llc Method and apparatus for pipe pressure measurements
JP2016509234A (en) * 2013-03-05 2016-03-24 ジーイー−ヒタチ・ニュークリア・エナジー・アメリカズ・エルエルシーＧｅ−Ｈｉｔａｃｈｉ Ｎｕｃｌｅａｒ Ｅｎｅｒｇｙ Ａｍｅｒｉｃａｓ， Ｌｌｃ Method and apparatus for measuring tube pressure
EP3004831A4 (en) * 2013-06-06 2016-10-12 Advanced Sensor Design Technologies Llc Apparatus and methods for measurement of pressure
US9746386B2 (en) 2013-06-06 2017-08-29 Advanced Sensor Design Technologies, LLC Apparatus and methods for measurements of pressure
US9512714B2 (en) 2013-12-27 2016-12-06 Halliburton Energy Services, Inc. Mounting bracket for strain sensor
US9932816B2 (en) 2013-12-27 2018-04-03 Halliburton Energy Services, Inc. Mounting bracket for strain sensor
US9593569B2 (en) 2014-02-24 2017-03-14 Halliburton Energy Services, Inc. Portable attachment of fiber optic sensing loop
US9512711B2 (en) 2014-02-24 2016-12-06 Halliburton Energy Services, Inc. Portable attachment of fiber optic sensing loop
CN104500035A (en) * 2014-12-09 2015-04-08 中国石油天然气集团公司 Method for improving precision of on-line stress detection data of underground casing string distributive optical fiber
WO2017125105A1 (en) * 2016-01-20 2017-07-27 Schaeffler Technologies AG & Co. KG Measuring arrangement for force or torque measurement for a machine element and machine element arrangement comprising a measuring arrangement of this type
GB2548985A (en) * 2016-03-18 2017-10-04 Schlumberger Technology Bv Along tool string deployed sensors
US10590754B2 (en) 2016-03-18 2020-03-17 Schlumberger Technology Corporation Along tool string deployed sensors
GB2548985B (en) * 2016-03-18 2020-07-01 Schlumberger Technology Bv Sensors deployed along a tool string

Also Published As

Publication number Publication date
GB2454220B (en) 2012-05-23
GB0721436D0 (en) 2007-12-12
WO2009056853A1 (en) 2009-05-07

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