CN217639566U - Double-helix winding optical fiber detection sensing device for microseism monitoring - Google Patents
Double-helix winding optical fiber detection sensing device for microseism monitoring Download PDFInfo
- Publication number
- CN217639566U CN217639566U CN202221442466.3U CN202221442466U CN217639566U CN 217639566 U CN217639566 U CN 217639566U CN 202221442466 U CN202221442466 U CN 202221442466U CN 217639566 U CN217639566 U CN 217639566U
- Authority
- CN
- China
- Prior art keywords
- thread groove
- optic fibre
- optical fiber
- protective housing
- pitch
- 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.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 62
- 238000004804 winding Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 50
- 230000001681 protective effect Effects 0.000 claims abstract description 41
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 4
- 239000011295 pitch Substances 0.000 description 14
- 239000003822 epoxy resin Substances 0.000 description 12
- 229920000647 polyepoxide Polymers 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 239000003292 glue Substances 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model provides a double helix winding optical fiber detection sensing device for microseism monitoring, including two tail nails, set up the protective housing that cavity set up between two tail nails, set up the winding axle in the protective housing, the first optic fibre and the second optic fibre that integrated into one piece set up, the epaxial first thread groove and the second thread groove that are spiral and interval and set up that is equipped with of winding, the screw direction of first thread groove and second thread groove is unanimous, the pitch of first thread groove and the pitch of second thread groove are the gradual change formula, first optic fibre and second optic fibre set up respectively in first thread groove and second thread groove, be equipped with two fiber coupler that are used for connecting first optic fibre and second optic fibre on the protective housing respectively, it is big and the SNR is low to solve among the prior art that the electric sensor that is used for detecting the microseism that hydraulic fracturing produced, the application threshold height of optic fibre vibration detection system, the construction cycle length is long, work load is big and hardly high-efficient problem of forming extensive multiplexing array.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber vibration sensor, particularly, relate to a double helix winding optical fiber detection sensing device for microseism monitoring.
Background
At present, the final capacity is directly influenced by the crack effect generated by shale gas hydraulic fracturing, the microseism monitoring technology is an effective means for detecting fracturing, and accurate microseism wave signals are important components of the microseism detection technology. The microseism generated by hydraulic fracturing is generally weak in excitation energy, the energy is very weak after the microseism is transmitted to the ground, and high-density and high-sensitivity vibration monitoring needs to be carried out in a crack spreading area in order to realize the detection of the fracture morphology. At present, most of the adopted sensors are electric point type microseismic sensors, the main problems of the existing sensors are that firstly, when high-density vibration monitoring is carried out, a large number of detectors are needed to form a detection array, and in addition, a collection station for signal processing can form a huge and complex system, so that the real-time performance and the reliability of data transmission can not be ensured. Secondly, a plurality of large-scale devices can be involved in the fracturing process, and when the devices work, a complex electromagnetic environment can be generated, so that the output of the electric sensor can be interfered, the signal-to-noise ratio is further reduced, and when massive information is collected, the signal distortion can be further caused.
The optical fiber vibration sensor mainly uses an optical fiber as a sensing element, signals can be directly transmitted through the optical fiber, external vibration signals can affect the phase of light waves in the optical fiber, and original vibration signals can be obtained through interferometer demodulation. Compared with an electrical sensor, the optical fiber sensor has the characteristics of high sensitivity, strong anti-electromagnetic interference capability, long signal transmission distance and the like. Most of the existing optical fiber vibration detection systems (DAS) applied to microseismic detection are methods for underground vertical detection or straight cable underground burying. The method has the main problems that the application condition is high, the underground or surface detection environment needs to be specially created for the optical fiber sensor, the construction period is long, the workload is large, and a large-scale multiplexing array is difficult to efficiently form.
For the double-spiral wound optical fiber vibration sensing unit, the double-spiral wound optical fiber vibration sensing unit has the characteristics of high sensitivity, simple structure, convenience in use, easiness in multiplexing into vibration sensing networks in various forms and the like, and is very suitable for hydraulic fracturing microseismic detection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a double helix winding optical fiber detection sensing device for microseism monitoring to solve the problem that the electric sensor that is used for detecting the microseism that hydraulic fracturing produced among the prior art is influenced by the electromagnetism greatly and the SNR is low, optical fiber vibration detecting system's application threshold height, construction cycle length, work load are big and hardly high-efficient formation extensive multiplexing array.
In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a sensitive device of two spiral winding optical fiber detection for microseism monitoring, including two tail nails, set up in the protective housing that cavity set up between two tail nails, set up in first optic fibre and the second optic fibre of winding axle, integrated into one piece setting in the protective housing, the epaxial first thread groove and the second thread groove that is spiral and interval and sets up that is equipped with of winding, the spiral direction of first thread groove and second thread groove is unanimous, the pitch of first thread groove and the pitch of second thread groove are the gradual change formula, first optic fibre and second optic fibre set up respectively in first thread groove and the second thread groove, be equipped with two optical fiber coupler that are used for connecting first optic fibre and second optic fibre respectively on the protective housing.
A further technical scheme is, the pitch that the pitch size of first optic fibre and second optic fibre is both ends is greater than the pitch at middle part, two one side that the tail nail is relative all is equipped with the protective housing spacing groove of size and protective housing looks adaptation, the both ends of protective housing set up respectively in two protective housing spacing inslots, and make protective housing and tail nail stably link to each other through fastening bolt, the tail nail lower part is the taper shape.
The further technical scheme is that the thickness of the protective shell is 0.5-1mm, and the linear shape of the protective shell is one of a straight line, an arc line and a circular ring.
According to a further technical scheme, the first optical fiber and the second optical fiber are bonded to the winding shaft through epoxy resin glue.
According to a further technical scheme, the width of the first limit groove of the protective shell is 0.5-1mm, and the depth of the first limit groove of the protective shell is 5-7 mm.
The further technical scheme is that the winding shaft and the tail nail are in interference connection by adopting a basic shaft system H7/m6.
In a further aspect, the first optical fiber and the second optical fiber are wound with a bending radius of not less than 30mm.
According to a further technical scheme, when the middle part of the winding shaft is wound on the winding shaft, the thread pitches of the first optical fiber and the second optical fiber are 6-10mm, and the thread pitches of the optical fibers near two end faces are about 15-20mm.
The further technical scheme is that an optical fiber connector installed on the protective shell adopts an optical fiber coupler with a flange plate.
Compared with the prior art, the beneficial effects of the utility model are that: the technical scheme of the utility model first optic fibre and the second optic fibre that integrated into one piece set up adopt the equidirectional pitch variable mode of winding to twine the winding axle, the winding pitch of the first optic fibre of winding axle middle part and second optic fibre is little, the winding pitch at winding axle both ends face of first optic fibre and second optic fibre is big, glue first optic fibre and second optic fibre respectively to the first thread groove and the second thread groove of winding axle with epoxy, winding axle and tail nail adopt interference fit, and designed fiber coupler on the protecting sheathing, it can shift integrated into one piece's first optic fibre and second optic fibre with tail nail vibration sensitive information on, adopt first optic fibre and second optic fibre jumper wire to be connected a plurality of these products. The device not only enhances the microseism information acquisition sensitivity, but also can realize the sensor multilevel connection and array multiplexing, and meanwhile, the whole device has a simple structure, reduces the application threshold of the optical fiber vibration detection system, shortens the construction period and reduces the working time for personnel testing.
Drawings
Fig. 1 is a schematic structural diagram of the double helix wound optical fiber detection sensing device for micro-seismic monitoring of the present invention.
Fig. 2 is a schematic view of the connection between the first optical fiber and the winding shaft and the second optical fiber and the winding shaft of the present invention.
Fig. 3 is a schematic structural view of the winding shaft of the present invention.
Icon: 1-tail nail, 2-protective shell, 3-winding shaft, 4-first optical fiber, 5-second optical fiber, 6-first thread groove, 7-second thread groove, 8-optical fiber coupler, 9-protective shell limiting groove and 10-fastening bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example (b):
fig. 1, fig. 2 and fig. 3 show a preferred embodiment of a double helix winding optical fiber detection sensing device for microseism monitoring, this embodiment specifically includes two tail nails 1, set up in protective housing 2 that cavity set up between two tail nails 1, set up in first optic fibre 4 and second optic fibre 5 that winding shaft 3, integrated into one piece set up in the protective housing 2, be equipped with first thread groove 6 and second thread groove 7 that are spiral and interval setting on the winding shaft 3, the spiral direction of first thread groove 6 and second thread groove 7 is unanimous, the pitch of first thread groove 6 and the pitch of second thread groove 7 are the gradual change formula, first optic fibre 4 and second optic fibre 5 set up respectively in first thread groove 6 and second thread groove 7, be equipped with two optical fiber coupler 8 that are used for connecting first optic fibre 4 and second optic fibre 5 respectively on the protective housing 2.
The utility model discloses in, winding shaft 3 constitutes optical fiber sensor with integrated into one piece setting's first optic fibre 4 and second optic fibre 5.
In the embodiment, when the protective shell 2 is sealed, an epoxy resin sealing ring is arranged at the joint of the protective shell 2 and the tail nail 1, the thickness of the epoxy resin sealing ring is between 0.5 and 1.0mm, and the width of the epoxy resin sealing ring is between 1.0 and 2.0mm, or epoxy resin glue is directly injected into the protective shell limiting groove 9 and then connected with the protective shell 2; winding shaft 3 manufacturing process: respectively arranging a first optical fiber 4 and a second optical fiber 5 in a first thread groove 6 and a second thread groove 7, respectively fixedly arranging the first optical fiber 4 and the second optical fiber 5 in the first thread groove 6 and the second thread groove 7 through epoxy resin glue, respectively, wherein the thread pitches of the first optical fiber 4 and the second optical fiber 5 in the middle of a winding shaft 3 are smaller than the thread pitches of the first optical fiber 4 and the second optical fiber 5 at two ends of the winding shaft 3, the starting point and the ending point of an optical fiber whole formed by integrally forming the first optical fiber 4 and the second optical fiber 5 are fixed on the winding shaft 3 through epoxy resin glue, so that the whole optical fiber whole is tightly attached to the first thread groove 6 and the second thread groove 7 on the winding shaft 3, the whole winding shaft 3 is vertically placed in a silica gel mold, the inner diameter of the silica gel mold is 1-1.5mm larger than the diameter of the winding shaft 3, the coaxiality of the mold and the winding shaft 3 is ensured to be less than 0.2mm, injecting epoxy resin glue into the winding mold to ensure that the epoxy resin wraps the winding shaft 3 completely, cooling and then solidifying the epoxy resin after 12 hours; the winding shaft 3 and the two tail nails 1 are in interference connection, the base shaft is made into H7/m6, and the width of the limiting groove 9 of the protective shell is 0.1-0.5mm wider than the thickness of the protective shell 2; the end part of the optical fiber coupler 8 is provided with a protective cap which is made of soft rubber and can be screwed on the end part of the optical fiber coupler 8 through threads inside the protective cap.
The assembly process of this embodiment: the two ends of the cured winding shaft 3 are respectively connected with the two tail nails 1 in an interference manner, epoxy resin glue is injected into the protective shell limiting groove 9, the protective shell 2 is inserted into the protective shell limiting groove 9 before the epoxy resin glue is cured, meanwhile, the protective shell is fixed through the fastening bolt 10, the protective cap of the optical fiber coupler 8 is sleeved on the end part in a non-use state, and the protective cap is unscrewed when in use.
The application principle and method of the embodiment are as follows: the utility model discloses the principle is through 1 structure of tail nail with first optic fibre 4 and the second optic fibre 5 that seismic information conduction to the integrated into one piece setting on the winding axle 3 to influence information such as phase place, intensity of optical propagation in first optic fibre 4 and the second optic fibre 5, use up information processing device alright in order to obtain external vibration information. The optical fiber sensor can be used as an optical information acquisition unit to be connected to an optical fiber interferometer or other optical fiber sensing systems, laser is injected into the sensor through the whole optical fiber, optical information carried by the laser after passing through the optical fiber sensor is influenced by external vibration to change, and the optical information is output to an optical receiver to obtain an external vibration signal after signal processing; or a plurality of optical fiber sensors can be connected into an array multiplexing form through an optical fiber integral jumper to form an optical fiber vibration sensing network.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (2)
1. A double helix winding optical fiber detection sensing device for microseism monitoring is characterized in that: including two tail nails (1), set up in protective housing (2) that cavity set up between two tail nails (1), set up in first optic fibre (4) and second optic fibre (5) that winding axle (3), integrated into one piece set up in protective housing (2), be equipped with on winding axle (3) and be first thread groove (6) and second thread groove (7) that spiral and interval set up, the spiral direction of first thread groove (6) and second thread groove (7) is unanimous, the pitch of first thread groove (6) and the pitch of second thread groove (7) are the gradual change formula, first optic fibre (4) and second optic fibre (5) set up respectively in first thread groove (6) and second thread groove (7), be equipped with two fiber coupler (8) that are used for connecting first optic fibre (4) and second optic fibre (5) respectively on protective housing (2).
2. The double helix wound optical fiber detection sensing device for micro-seismic monitoring of claim 1, wherein: the pitch of first optic fibre (4) and second optic fibre (5) is the pitch at both ends greatly and is greater than the pitch at middle part, two one side that tail nail (1) is relative all is equipped with protective housing spacing groove (9) of size and protective housing (2) looks adaptation, the both ends of protective housing (2) set up respectively in two protective housing spacing grooves (9), and make protective housing (2) link to each other with tail nail (1) is stable through fastening bolt (10), tail nail (1) lower part is the taper shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221442466.3U CN217639566U (en) | 2022-06-07 | 2022-06-07 | Double-helix winding optical fiber detection sensing device for microseism monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221442466.3U CN217639566U (en) | 2022-06-07 | 2022-06-07 | Double-helix winding optical fiber detection sensing device for microseism monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217639566U true CN217639566U (en) | 2022-10-21 |
Family
ID=83624990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221442466.3U Expired - Fee Related CN217639566U (en) | 2022-06-07 | 2022-06-07 | Double-helix winding optical fiber detection sensing device for microseism monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217639566U (en) |
-
2022
- 2022-06-07 CN CN202221442466.3U patent/CN217639566U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207095615U (en) | Tunnel monitoring system based on fiber grating | |
| CN102944613A (en) | Detecting and positioning system for optical fiber acoustic emission | |
| CN102692640B (en) | Optical fiber deep well earthquake sound instrument | |
| CN203465450U (en) | Strain and temperature dual-parameter optical cable | |
| CN103868580A (en) | Optical fiber-based power transmission conductor aeolian vibration monitoring digital sensor and monitoring method | |
| CN217639566U (en) | Double-helix winding optical fiber detection sensing device for microseism monitoring | |
| CN101539015A (en) | Underground wireless pressure transmission transmitter | |
| CN106441653B (en) | A kind of geomechanical model test cut-and-cover tunnel model stress strain monitoring method | |
| CN201521291U (en) | Underground distributed temperature sensor | |
| CN203822543U (en) | Novel monitoring system of wind generator set | |
| CN201334905Y (en) | Underground wireless pressure transmission transmitter | |
| CN108061522A (en) | Distribution type fiber-optic Bragg grating MISSILE LAUNCHING case strain monitoring system | |
| CN117028839A (en) | Intelligent monitoring method and early warning system for leakage of hydrogen gas storage | |
| CN215486112U (en) | Anchor rod stress automatic monitoring system | |
| CN203893974U (en) | Mechanical structure of fiber grating sensor for derrick stress monitoring | |
| CN214667238U (en) | Optical fiber passive ground wave induction monitoring tube | |
| CN208476205U (en) | A kind of Excavation Deformation of Deep Foundation Pits real-time monitoring device | |
| CN207395653U (en) | A kind of strata displacement monitoring device | |
| CN103162636A (en) | Tunnel deformation monitoring device | |
| CN114325816A (en) | Underground detection device | |
| CN108007333A (en) | A kind of strata displacement monitoring device and monitoring method | |
| Jie et al. | A new packaged FBG sensor for underground cable temperature monitoring | |
| CN203550914U (en) | Conducting wire icing on-line monitoring device based on OPGW optical fiber | |
| CN206892256U (en) | Interplantation formula high-tension cable shelf depreciation two-dimensional ultrasound sensor based on laser interference | |
| CN106990339B (en) | Laser interference-based embedded high-voltage cable partial discharge two-dimensional ultrasonic sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20221021 |