GB2538659A

GB2538659A - Mounting bracket for strain sensor

Info

Publication number: GB2538659A
Application number: GB1615014.6A
Authority: GB
Inventors: Sobolewski Zbigniew; Anthony Sitka Mark
Original assignee: Halliburton Energy Services Inc
Current assignee: Halliburton Energy Services Inc
Priority date: 2013-12-27
Filing date: 2013-12-27
Publication date: 2016-11-23
Anticipated expiration: 2033-12-27
Also published as: GB201615014D0; GB2538659B

Abstract

A system and method for mounting at least one strain sensor on a tubular pipe 201. The system comprising first and second mounting blocks 210, each positioned adjacent the outer surface of the pipe. A sensor mounting arm 220 is connected to each of the mounting blocks, each sensor mounting arm having a receptacle to receive an end of a stem rod 230, the stem rod having a longitudinal receptacle 234 configured to receive a strain sensor 202. A magnet 240 is located in a receptacle 242 on each of the mounting blocks. Each of the magnets 202 having a surface 244 positionable adjacent to an outer surface of the pipe 201. The magnets 240 are used to mount the mounting blocks to the pipe. The strain sensor may be a Fiber-Bragg grating or a Fabry-Pérot interferometer.

Description

g Br ke t for Strad Sensor

TECHNICAL FIELD

[0001] This present disclosure relates to pparatus for pe sections.

BACKGROUND

[0002] in connection with the recovery of hydrocarbons from the earth, welibores generally drilled using any of a variety of different methods and equipment. According to one common method, a drill bit is rotated against the subsurface formation to form the wellbore, The drill bit may be rotated in the wellbore through the rotation of a drill string attached to the drill bit and/or by the rotary force imparted to the drill bit by a subsurface drilling motor powered by the flow of drilling fluid down the drill string and through downhole motor.

[0003] The flow of drilling fluid can exhibit variations in pressure. These pressure variations can cause dimensional changes in solid structures such as piping that carries the drilling fluid to and from the drill string. Strain gauges are used for detection and measurement of absolute dimensional changes of solid structures, such a piping for drilling fluid, but such changes are generally very slow and difficult to observe with known equipment and measurement methods.

DESCRIPTION OF DRAWINGS

[0004] FIG. 1 Es a perspective view of an example optical sensor r [0005] FIGS, 2 and 3 are exploded and perspective views of another example optical sensor mount.

[0006] FIG. 4 is a conceptual representation of an example optical Censor mount in a stressed condition.

(0007] FIG, 5 is a conceptual representation of an example optical sensor mount in a stressed condition.

[0008] FIG. 6 is another conceptual representation of an example optical sensor mount in a stressed condition.

DETAILED DESCRIPTION

[0009] This document describes systems and techniques for mounting sensor attachments to drilling fluid (also referred to in the industry as drilling mud) piping on drilling rigs, The assemblies described in this document can be used to mount several different types of optical sensors, including temperature, pressure, and/or strain sensors. Some of these sensors can be optical sensors and gauges based on the operating principles of a Fiber-Bragg grating andier Febry-Panot interferometer.

[0010] In general, optical sensor mounts clamp, attach, or are otherwise affixed to an outside surface of one or more pipes in the drilling fluid piping system. Fluid (for example, drilling fluid) flowing through the pipe exerts a pressure force outward against the pipe, which causes email changes in the diameter of the pipe that vary with the pressure of the fluid within. The optical sensor mounts mechanically transfer, and in some implementations, amplify or reduce, changes in pipe diameter to one or more sensors. The signal outputs of such sensors can then be processed to observe changes in the diameter of the pipe. The changes in diameter of the pipe diameter may be processed using known physical characteristics of pressure pipes as described, for example, in Pressure Vessel Design Manual" by Dennis Moss. Detection of said changes can allow for downhole pressure pulse detection whereas said pressure pulses can convey the specific information or data content, examples of which are described in Halliburton patents U6748020732 and US740445862.

[0011] FIG. 1 is a perspective view of an example optical sensor mount 100. The mount 100 is a generally circular mechanical clamp having an inner diameter 102 sized to accommodate an outer diemeter of a pipe (not shown) on which the mount 100 is to he mounted. The mount 100 includes three main sections, including a bottom flexing section 120, a first upper flexing section 140, and a second upper flexing section 160.

[0012] The bottom flexing section 120 is a generally semi-circular arcuate portion, having a terminal end 122a in a mounting wing 124a, and a terminal end 122b in a mounting wing 124b. The mounting wing 124a is formed generally perpendicul terminal end 122a, and the mounting wing 124b is formed generally perpendicular to the terminal end 122b. The mounting wing 122a includes a bore 126a, and the mounting wing 122b includes a bore 126b, the bores 120a-1261a for receiving a removable connector (not shown) such es a bolt or other appropriate fastener.

[0013] The bottom flexing section 120 has a thickness 128. The bottom flexing section 120 includes a subsection 130 that has a thickness 132 that is less than the thickness 128. In some implementations, as the bottom flexing section 120 flexes, the relatively lesser thickness 132 of the subsection 130 may cause distortion of the bottom flexing section 120 to be at least partly concentrated along the subsection 130.

[0014] The upper flexing section 140 includes an arcuate portion 142 that is general y quarter-circular in shape, terminating at a terminal end 143 in a mounting wing 144 and a terminal end 146 in a mounting wing 148. The mounting wing 144 is formed generally perpendicular to the terminal end 143 and includes a bore 150 for receiving a removable connector (not shown) such as 2 bolt or other appropriate fastener when the bore 150 is aligned with the bore 126a to removably affix the upper flexing section 140 to the bottom flexing section 120.

[0015] The mounting wing 148 is formed generally tangent to the terminal end 146 and includes a pivot pin assembly 152 having a bore 153 that is formed parallel to a central longitudinal axis 103 of the mount 100. The bore 153 is formed to receive a removable connector (not shown) such as a belt or other appropriate Fastener.

[0016] A sensor mounting arm 154 extends generally perpendicular from the upper flexing section 140. The sensor mounting arm 154 including at least one receptacle 156 d to receive and retain an end 192a of a sensor 190, such as a strain gauge, an optical sensor, a Fiber-E3regg grating, a Fabfy-Perot interferometer etalon, or any other appropriate sensor.

[0017] The upper flexing a (ion 160 includes an erpuateportion 162 that is generally quarter-circular in shape, terminating at a terminal end 163 in a mounting 164 and a terminal end 166 in a mounting wing 168. The mounting wing 164 is formed generally perpendicular to the terminal end 163 and includes a bore 170 for receiving a removable connector (not shown) such as a bolt or other appropriate Fastener when the bore 170 is aligned with the bore 126b to removably affix the upper flexing section 160 to the bottom flexing section 120, The mounting wing 188. is formed generally tangent to the terminal end 166 and includes a pivot pin assembly 172 having a bore 174 that is formed parallel to the central longitudinal axis 103 of the mount 100. The bore 4 is formed to receive a removable connector (not shown) such as a bolt or other appropriate fastener when aiigned with the bore 153.

[0019] A sensor mounting arm 175 extends generally perpendicular from the upper fiexing section 160. The sensor mounting arm 175 including at least one receptacle 176 sized to receive and retain an end 192b of the sensor 190.

[0020] The mount 100 includes a collection of adjustment rods 180. The adjustment rods extend through the mount 100 inwardly in a radial direction toward the longitudinal axis 103 of the mount 100 through a coliection of adjustment openings 181. The inward end of each of the adjustment rods 180 terminates in a landing pad 182. The adjustment rods 180 and the landing pads 182 form a collection of adjustment assembiies 184 formed to move the adjustment rods 180 and the landing pads 182 into adjustable contact with the pipe on which the mount 100 is to be mounted. In some embodiments, djustment assemblies 184 can include femaie threads in each of the adjustment openings, and the adjustment rodsd80 can include at least a porton with male threads adapted to be received in the female threads, In some embodiments, compression pads can be affixed to the landing pads 182. In some embodiments, the compression pads can include layers of vibration and acoustic noise absorbing material.

[0021] When assembled in a substantially unstressed or a predetermined gre-ed or strained configuration, the sensor mounting arms 154 and 175 are oriented substantiatly parallel to each other. In s such a substantially parallel configuration, the sensors e stressed to subs e degree. For example, w sensors in the example parallel configuration can provide substantially the same outputs, which can be used to cancel out common made noise differentiai measurement configurations, [0022] In some implementations, the mount 100 can be rpmt vably affixed to piPe by placing a fastener though the bores 126a and 150, and by placing another fastener through the bores 126b and 170, while omitting a fastener from the pivot pin assemblies 152, 172. In such an example configuration, as the pipe varies in diameter (e.g,, due to variations in pressure of the fluid within the pipe), the unfastened pivot pin assemblies 152, 172 can separate slightly, causing the sensor mounting arms 154 and 175 to move away from their substantially parallel, unstressed configuration. As the sensor mounting arms 154 and 175 diverge, the sensors 190 mounted at different radial positions on the sensor mounting arms 154 and 175 will experience differing amounts of stress. In some implementations, the differing amounts of stress can produce a differential signal by the sensors 190 that can be processed to determine the absolute or change in fluid pressure within the pipe.

[0023] Referring now to FIG. 4, a simplified version on is shown to illustrate one example effect of stress upon the mount 100. In the illustrated example, the upper flexing sections 140, 160 are removably affixed to the bottom flexing section 120 by a pair of bolts 410 and the restraining bait (not shown here) is inserted in the bores 153, 174. When the mount 100 is clamped about pipe (not shown) that is substantially unpressurized and therefore substantially unexpended, the mount 100 can take on the configuration shown in solid ines. When the pipe is pressurized, the walls of the pipe will expand. This expansion will cause the sensor mount arms 154 and 175 to converge or otherwise move relatively closer, taking on the configuration shown in dotted lines.

[00241 Referring again to FIG. 1, in some implementations, a linking plate 195 can be removably affixed to the radially distal ends of the sensor mounting arms 154 and 175 with respect to each other, mechanically linking the sensor mounting arms 154 and 175 to each other. By linking the sensor mounting arms 154 and 175 to each other through the linking plate 195, the movement of the sensor mounting arms 154 arid 175 as the pipe expands and contracts can be modified. In some implementations, the linking plate 195 may be used as an aid to assembly of the mount 100 about the pipe. For example, the linking plate 195 may be used to temporarily affix the upper flexing sections 140, 160 during assembly, and may be removed after the upper flexing sections 140, 160 are affixed to the bottom flexing section 120.

[0025] Referring now to FIGS. 5 and 6, simplified versions of the mount 100 are shown to illustrate the affects of the inking plate 195 on the flexure of the mount 100. FIG, 5 is a conceptual example configuration 500 of the mount 100 without the linking plate 195 and without the restraining bolt. In the example configuration 500, as the pipe (not shown) expands within the mount 100, the sensor mounting arms 154 and 175 move from their subsiantiaily unstressed or pre-stressed configuration, as depicted in dotted lines, relatively apart to the stressed configuration depicted in solid iines. In general, without the linking plate 195 in place, the radially distal ends 510 of the sensor arms 154 and 175 will move relatively further apart from each other then will more radially proximal portions 520 of the sensor arms 154 and 175.

[00261 In some implementations, as the pressurized pipes diameter D increases by X, the strain can be expressed as a ratio X/D. The same displacement X applied over a shorter distance L between expansion arms can lead to strain amplification because Xfi.. >> X/D.

[0027] FIG. 6 is a conceptual example configuration 600 of the mount 100 with the linking plate 195 affixed across the sensor mounting arms 154 and 175 and the restraining bolt not present. In the example configuration 600, as the pipe (not shown) expands within the mount 100, the linking plate 195 partly constrains movement of the radially distal ends 510, causing the radially proximal portions 520 of the sensor mounting arms 154 and 175 to move from theft substantially unstressed or pre-stressed configuration, as depicted in dotted lines, relatively apart to the stressed configuration depicted in solid lines. In general, with the finking plate 195 in place, the radially proximal portion 520 et the sensor mounting arms 154 and 175 will move relatively further apart from each other than will more radially distal ends 510 of the sensor arms 154 and 175. When the linking plate 195 is used, the pipe diameter expansion, which can be expressed as dD = X, can result in a minimal top gap increase Xrnin at ends of sensor mounting arms 154 and 175 near the linking plate whereas Xmin is dose to zero with additional and relatively larger Xmax increase in distance between arms at location closer to the pipe whereas Xmax can be approximated as Xrnax -Pi X. [0028] Referring again to FIG. 1, in some implementations, a pivot pin (not shown) can be inserted through the bores 148, 168 of the sensor mounting arms 154 and 175. By piecing the pivot pin in the bores 148, 168, as the pipe expands and contracts, the divergence of the sensor mounting arms 154 and 115 will pivot about the pivot pin. For exampie, as the pipe expands, the sensor mounting a 154 and 175 can be caused to diverge from their substantially pa elle:, unstressed configuration and the arms will move inwardly at an angle toward each other.

[0029] In some embodiments, the pivot pin can be compressible or otherwise deformable, or can include a compressible or otherwise deformable coating about a substantially non-compressible core rod. In some implementations, the use of selected compressible or deformable components for the pivot pin can provide selectable modification of convergence or divergence of the sensor mounting arms 154 end 175. For example, by including a compressible pivot pin in the pivot pin assemblies 152, 172, separation of the pivot pin assemblies 152, 172 can be permitted in a reduced manner relative to movement that may occur with or without the use of a non-deformable pivot [0030] In some embodiments, the linking plate 19s can be formed to have a selected' spring coefficient. For example, the stiffness of the linking pate 195 n be selected to selectably modify the divergence of the sensor mounting arms 154 and 175 under various stress configurations. In some embodiments, one or more sensors can be mounted on the linking plate 195. For example, sensors can be configured to provide signals that indicate tensile, compressive, or bending stresses at the linking plate 195. In some embodiments, one or more sensors can be mounted between inner surfaces of the sensor mounting arms 154 and 175 and/or in any other suitable section of 120, 140, and/or 160. For example, a load cell can be mounted between the sensor ounting arms 154 and 175 to provide a signal in response to relative inward and outward movements of the sensor mounting arms 154 and 175.

While the present example is shown and described as including four sets of the adjustment assemblies 134, various implementations can include any appropriate number of the adjustment assemblies 184 mounted through corresponding ones of the adjustment openings 181. For example, one of the adjustment assemblies 184 can be mounted on the upper flexing section 140, and another one of the adjustment assemblies 184 can be mounted in the adjustment opening 181 located in the bottom flexing section 120 approximately 180 degrees away, In another example, one of the adjustment assemblies 184 can be mounted in each of the upper flexing sections 140, 160, and a third one of the adjustment assemblies 184 can be mounted in the adjustment opening 181 located in the central section of the subsection 130.

[0032] FIGS. 2 and 3 are exploded and perspective views of another example optical sensor mount 200. In general, the mount 200 is removably or permanently affixed to a pipe 201 to mechanically transmit variations in the diameter of the pipe 201 to a collection of sensors 202, such as a strain gauges, optical sensors, Fiber-Bragg gratings, Fabry-Perot interferometers, or any other appropriate sensors.

[0033] The mount 200 includes a pair of mounting blocks 210 each having a proximal surface 212 and a distal surface 214. The proximal surfaces 212 are positionable adjacent to an outer surface 203 of a wall 204 of the pipe 201, and spaced about 180 degrees apart from each other.

[0034] The mount 200 includes e pair of sensor mounting arms 220. One of the sensor mounting arms 220 is removably affixed to each of the distal surfaces 214 by a collection of fasteners 222, such as bolts, screws, or other appropriate connectors. The sensor mounting arms 220 each includes a receptacle 224 configured to receive and retain an end 232 of a stem rod 230. The ends 232 are further retained by fasteners 231, such as nuts, retaining pins, or other appropriate connectors. In some embodiments, the ends 232 and the fasteners 231 can form a tension adjustment mechanism for the stern rod 230. For example, the adjustment mechanism can include male threads on at least one of the ends 232 of the stem rod 230, and the fasteners 231 can include female threads adapted to engage the male threads of the stem rod 230. In such examples, the fasteners 231 can be threaded along the ends 232 to adjust the tension along the stern rod 230.

[00:38] The stern rod 230 includes at least one longitudinal receptacle 234 ir't an outer surface of the stern rod 230. Each of the longitudinal receptacles 234 is formed to receive and retain one of the sensors 202. The stem rod 230 has a first cross sectional area 236 at a central portion of one of the longitudinal receptaties 234, and a second cross sectional area 238 at a centre: portion of another one of the longitudinal receptacles 234. As discussed later herein, the cross sectional areas may be the same or different.

0o36] In some implementations, a magnet 240 is located in a receptacle 242 formed in each of the proximal surface 212 of the meuntingEibiocks 210. The magnets 240 include a first surface 244 positionable adjacent to the outer surface 203 of the wall 204 of the pipe 201, and a surface 240 positionable adjacent to the mounting blocks 210. In some embodiments, the mount 200 can be mounted to the pipe 201 by the magnets 240. In some embodiments, the mount 200 can be mounted to the pipe 201 by welding, gluing, or otherwise adhering the mounting blocks 210 to the pipe 201. it

[0037] The mount 200 is assembled in a predetermined strain condition in which the sensor mounting arms 200 are generally parallel to each other and the stem rod 230 is mounted generally perpendicular to a longitudinal axis of each of the sensor mounting arms 220. The pressure of fluid flowing through the pipe 201 exerts pressure on the wall 204, causing variations in the diameter at the outer surface 203. As the diameter changes, the distance between the mounting blocks 210 changes as well, Since the mounting blocks 210 are connected to each other though the sensor mounting arms 220 and across the stem rod 230, as the pipe 201 expands and contracts the stem rod 230 is caused to expand or contract end/or flex. The sensors 202, mounted in the receptacles 234, are caused to expand or contract and/or flex along with the stem rod 230 and provide signals that vary as a function of the flexure and the compressive or ile stress in the rod.

[0038] In some embodiments, the first cross sectional area 236 can have a different cross sectional area than the second cross sectional area 238. In such embodiments, the first cross sectional area 236 will expand or contract or flex at a different rate than the second cross sectional area 238 relative to the expansion and contraction of the pipe 201, and the differing rates of expansion or contraction and flexure can produce differing amounts of stress among the sensors 202. In some implementations, the differing amounts of stress in the sensors can produce a differential signal that can be processed to determine the absolute or changes in fluid pressure within the pipe. In some implementations, the thicknesses of the stem rod 230, the first cross sectional area 236, and the second cross sectional area 238 can be formed to selectively determine the amount compression, tension or flexure that occurs along the stern rod 230, and/or between the sensors 202.

[00391 Although a few impiementations have been described in detail above, other modifications are possible. For example, logic flows do not require the particular order described, or sequential order, to achieve desirable results, in addition, other steps may be provided, or steps may be eliminated, from the described flows, and other components may be added lo, or removed from; the described systems. Accordingly, other implementations are within the scope of the following claims.

4 The foiiowing nur bereidt also form of the pre

disclosure:

(0041] 1. A system for mounting a strain sensor on a tubular pipe, the system comprising: chanical clamp having a central longitudinal axis, said mechanical clamp having a plurality of sections including: a bottom flexing section having an arcuate portion terminating at a first terminal end in a first mounting wing and said bottom flexing section terminating at a second end in a second mounting wing, each of said mounting wings including an opening through the wing for receiving a removable connector; a first upper flexing section having tiate portion terminating at a. first terminal end in a mounting wing and said first upper flexing section terminating at second terminal end in a pivot pin assembly having a bore parallel to the central longitudinal axis of the clamp, the mounting wing having an opening through the wing for receiving a removable connector; a second upper flexing section having an arcuate portion terminating at a first terminal end in a mounting wing and said first upper flexing section terminating at second terminal end in a pivot pin assembly having a bore parallel to the central longitudinal axis of the clamp, the fling wing having an opening through the wing for receiving a removable connector; a first sensor mounting disposed outwardly on the first upper section, said sensor mounting including at least one receptacle sized to receive and retain a first end of a first strain gauge; and a second sensor mounting arm disposed outwardly on the second upper flexing section, said sensor mounting arm including at least one receptacle ized to receive and retain a second ti of a first strain gauge.

[0042] 2. The mounting...yster n of statement 1, wherein when the mechanical clamp is assembie,d in a predetermined strain condition, the first sensor mounting arm is parallel to the second sensor mounting a [0043] 3. The punting system of atement 1 further including a second receptacle in the first mounting arm sized to receive and retain a first end of a second strain gauge and receptacle in the second mounting is arm siz..ed toreceive and retain e d end of a second strain gauge.

[0044] The mounting sgstem of ent t, a h eln the st sin gau Fiber-Bragg grating strain gauge, [0045] 5. The mounting system Fakery-Perot interferometer.

[t5 46] 6. The mounting system systerfi of anystatements to further including linking plate connected to a distal end of the first mounting arm and connected to a distal end'of the second mounting arm.

The mounting system of sta further cluding a pivot pin with compressible coating i assembly, pivot pin including the be received in tine bore of the pivot pin pressible coating, where [0048] 8. The n Mina asse bly of tatemen wherein the bottom flexino section further includes at least one adjustment opening there through disposed inwardly in a radial direction toward the longitudinal axis, said opening sized to receive a first adjustment rod; and wherein the first upper flexing section further includes at least one 15. adjustment opening there through disposed inwardly in a radial direction toward the longitudinal axla, said opening sized to receive a sec adjustment rod; and wherein the second upper flexing section further includes at least one adjustment opening there through disposed inwardly in a radial direction toward the longitudinal axis, said opening sized to receive a third adjustment rod; and Wherein the nd, and third adjustment rods each include a landing pad affixed to an end of each adjustment rod positioned toward the longitudinal axis.

[0049] 9. The mounting system of statement 8 further including an adjustment mechanism for each rod adapted to move the rod and the landing pad mounted lberecin into contact with the pipe on which the mounting system is to be mounted.

[0050] system of statement 8 including a compression pad affixed to each of the landing pads, [0051] 11 The mounting system of statement 10, wherein the compres pad includes fayers of vibration and acoustic noise absorbing material.

[0052] 12. A method of mounting a strain sensor to a pipe comprising; positioning a mechanical clamp circurrfer rttially around an outer surface of a pipe wall, said mechanical clamp having a central longitudinal ax s said mechanical damp having a plurality of sections including: a bottom flexing section having an arcuate portion terminating at a first terminal end in a first mounting wing and said bottom flexing section terminating at a second end in a second mounting wing, each of said mounting wings including an opening through the wino for rec removable connector; a first upper flexing section having an arcuate portion terminating at fret terminal end in a first mounting wing and said first upper flexing section terminating at second terminal end in a pivot pin assembly having a bore parallel to the central longitudinal axis of the damp, the mounting wing having an opening through the wing for receiving removable connector; a second upper flexing section having an arcuate portion qe terminating at a first terminal end in a first mounting wing and said first upper flexing section terminating at second terminal end in a pivot pin assembly having a bore parallel to the central longitudinal axis of the clamp, the mounting wing having an opening through the wing for receiving a removable connector; a first sensor mounting arm disposed outwardly on the first upper flexing section, said sensorg arm including at least one receptacle sized to receive and retain a first end of a first strain gauge; and a second sensor mounting arm disposed outwardly on the second upper flexing section, wherein when the mechanical, said sensor mounting arm including at least one receptacle sized to receive and retain a second end of a first strain gauge; and positioning a strain ensor with a first end in of the and a second end of the strain sensor in the ec:tcle oaf tii second sensor mounting arm

13. The method of statement 12 further comprising:

nserting one or more individual adjustment rods inwardly in a radial direction toward the longitudinal axis in one or more radial openings in one or more of the bottom flexing section, the first upper flexing, and the second upper flexing section; and contacting the outer surface of e pipe with a landing pad affixed to an end of each adjustment rod positioned toward the longitudinal axis of the pipe.

1[3064] 14. The method of statement12 further comprising: positioning the first sensor mounting arm parallel to the second sensor mounting arm when the damp is in an sin condition, [0055] 15. The method of statement 12 further sing; positioning a second strain sensor with a firs end in a second receptacle of the first sensor mounting arm and a second end of the second strain sensor in a second receptacle ref the second sensor nting arm.

16. The method at en 2 further including connecting a rigid linkin plate to a distealend ountinq and to a distal end of d mounting [0057] 17. The method of statement 12, wherein the pivot pin includes a compressible coating thereby,providing additional flexibility to the mechanical damp, [0058] 18. The mounting sys terneach oaf thelanding In pads include a compression pad having at least one layer of vibrationand acoustic noise absorbing material affixed to each of the landing pads; and the method further includes dampening vibration and acoustic noise from the pipe.

[0059] 19. A system for ountin strain gauges on a tubular pipe. the system comprising: a first mounting block having a proximal first surface positionable adjacent to a first portion of an outer surface of a wall of the pipe, said first mounting block having a distal mounting surface; a second mounting block having a proximal first surface positionable adjacent to second portion of an outer surface a wail of the pipe, said second portion of the pipe wail being displaced from the first portion, said second mounting block having a distal mounting surface; a first sensor a/Dueling arm connected to the distal mounting surface of the first mounting biock, said sensor mounting arm including at east one receptacle configured to receive and retain a first end of a stern rod; a sec * o connected to the dista surface cf the second mounting block, said sensor moray arm iris uding at least one repeefaele configured to receive and retain a as crarrd end of the stem rod; and wherein the stem rod includes a first l n itud al receptacle in an outer surface of the rod, said first receptacle configured to receive and list strain gauge, 20. The mechanical mounting system of statement 19, the stern rod having a first cross sectional area at a central portion of the first longitudinal receptacle and wherein the stern rod includes a second ton iudinal receptacle in the outer surface of the stem rod, said first receptacle configured to receive and retain a second strain gauge, said stem rod having a second cress central portion of the second longitudinal receptacle.

The statement wherein when he

d in a predetermined strain condition the first sensor mounting arm is genera l = parallel to the second sensor mixintin rod is.moaattted perpendicular to a Io axis of each mounting arm.

[0062] 22, The r counting system of statement 9 further comprising gnet received in a receptacle of the first surface f the first mounting bock, said magnet having at least a first surface positionable adjacent to a first portion of the outer surface of the wall of the pipe and at least a second 'surface positions b e adjacent to the first mounting block; and a second' magnet i eceved ptacle of th of 4' second mounting block, said magnet having at least a first surface positionable adjacent ond portion of the outer surface of the wall of the pipe and at least a second surface positionable adjacent to the second mounting block.

23 mounting system tat t 19, wherein the str in gauge is a (Fiber-Bragg grating.

[0064] 24. The mounting h in the strain a Fabry-Fteirot interferornete.r

[0065] 25. The mounting system of statement 19

adjustment mechanism for the stem rod.

[0066] 26. A method of mounting a strain gauge to a pipe comprising: lei:ling a first mounting block having a proximal first surface adjacent to a first portion of an outer surface of a wall of the pipe, said first mounting block having a distal mounting surface; positioning a second mounting block having a proximal first surface adjacent to second portion of an outer surface of a wail of the pipe, said second portion of the p p wall being displaced from the first portion, said second mounting block having a distal mounting surface; connecting a first sensor mounting arm to the distal mounting surface of the first mounting block; connecting a second ensor mounting area to the distal rrrounting, surface of the second mounting block; connecting a first end of a stem rod to the first sensor mounting arm; iectsra a second end of a stem rod to the second sensor mounting arm; positioning a first strain gauge in t longitudinal receptacle in an outer surface of the stem rod, said stem rod having a first cross sectional antral portion of the first longitudinal re e (0067] 27, The hod of state t 26 further including adjusting the ten n the stem rod prior to takin h the strain gauges usin tension adjustment mechanism on the stem rod;

(0068] 28. The method of statement ner comprising.

removably securing the first mounting arm to the pipe by positioning a first magnet in a receptacle of the first surface of the first mounting Nock and positioning the magnet with a first surface adjacent to a first portion of the outer surface of the wall of the pipe and at least a second surface adjacent to the first mounting block; and removably securing the second mounting arm to the pipe by positioning a second magnet in a receptacle of the first surface of the second mounting block and positioning the magnet with a first surface adjacent to a second portion of the outa= r surface of the wall of the pipe and at least a second surface adjacent the second mounting block.

Claims

AIMS

A system for at least tenser on a tubular pipe, the system comprising: a first mounting block having a proximal urfa positionabie adjacent t portion of an outer surface of a wall of the pipe, said first mounting block ing a distal mounting surface; second mounting block having a proximal first surface positionable adjacent.second portion of on outer surface of a wall of the pipe, said second portion of the pipe wail being displaced from the first portion, said second ar mounting block having a distal mounting surface; a first sensor mounting arm connected to the distal mounting surface of the first mounting block, said sensor mounting arm including at least one receptacle configured to receive and retain a first end of a stern rod; a second sensor mounting arm connected to the distal mounting the second mounting block, said sensor mountingg arm including at least one receptacle configured to receive and retain a second end of the stern rod; and wherein the stem rod includes a first longitudinal receptacle in an outer surface of the rod, said first receptacle configured to receive and retain a first strain sensor; fist magnet eived in a receptacle of he first surface of the first mounting block said magnet having at least a first surface positionable adjacent portion of the outer surface of the wall of the pipe and at least a second surface positionable adjac 41 t to the first mounting block; and a second magnet received in a receptacle of the first urf the second mounting block, said magnet ino at least a first surface positionable econd kortion d surface positio:" t to t -intinting
2. The M ortin 1. tai area at a central portion includes a second longitudinal cept a first cross c la al final receptacle and wherein the stem uter surface of the stem rod, sari tint receptacle configured to receive and retain a second strain gauge, said ate d having a second cross sectional'area at a central port:on of the second longitudinal receptacle.
3, The mounfing system of claim 1 ear 2, wherein when the mechanical clamp is assembled in a predetermined strain condition the first sensor mounting arm is generally parallel to the second sensor mounting arm and the stem rod is mounted perpendicular o a Iongitudinol axis of each mounting arm.
4. The mounting system of any one of claims 1 to 3, wherein the strain sensor is a Fiber-Bragg grating.
The mounting system cf any one of claims 1 to ierein the strain sen is a Fabry---Perol, interferometer..
6. The mounting system syate rr of any one of claims 1 to 5, Further including a tension mechanism for the d, A method of m in sensor pipe c wrirmisin positioning a first mounting block having a proximal first surface adjacent to a first portion of an outer surface of a wall of the pipe, said first mounting block having a distal mounting surface; posit' a second mounting block having a proximal first surface adjacent to a second portion of an outer surface of a wall of the pipe, said second portion of the pipe wall being displaced from the first portion, said s Gond mounting block having a distal mounting surface; connecting irst sensor mounting arm h distal n C first punting block; connecting a second sensor n arm to he distal rriountin d mounting block; connecting a first end rsf a stems rod to the first sensor mounting connecting a second id of a tern rod to the second sensor mounting arm; s positioning at least one strain sensor longitudinal receptacle in an outer surface of the stem rod, said stem rod having a first cross sectional area at a central portion of the first longitudinal receptacle; removably securing the first m unVng arm b the pipe by posit ing a magnet n a receptacle of the first surface of the first mounting block and 26 ith a first surface adjacent to a first portion of the outer surface of the wail of the pipe and at least a second surface adjacent to the first mounting block; and removably securing the second mounting arm to the pipe by po second magnet in a receptacle of the first surface of the second mounting block d positioning the magnet with a first surface adjacent to a second portion of the outer surface of the wail of the pipe and at:east a second surface adjacent to the second mounting bock.B. The method of claim 7, further including adjusting the tension in the stern s rod prior to taking measurement with the strain sensor using a tension adjustment mechanism on the stern rod.