CN106351646A - Underground sticking point measuring system equipped with fiber bragg grating sensor - Google Patents
Underground sticking point measuring system equipped with fiber bragg grating sensor Download PDFInfo
- Publication number
- CN106351646A CN106351646A CN201610847982.7A CN201610847982A CN106351646A CN 106351646 A CN106351646 A CN 106351646A CN 201610847982 A CN201610847982 A CN 201610847982A CN 106351646 A CN106351646 A CN 106351646A
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- China
- Prior art keywords
- fiber
- surveyed
- drilling rod
- optical fiber
- card system
- 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
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 49
- 238000005553 drilling Methods 0.000 claims abstract description 33
- 239000013307 optical fiber Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000003814 drug Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention provides an underground sticking point measuring system equipped with a fiber bragg grating sensor. The system comprises an underground instrument and a ground instrument, wherein the underground instrument comprises a cable joint, an optical fiber magnetic positioning sensing device, an optical fiber torsion sensing device and a blasting device; the optical fiber magnetic positioning sensing device comprises a substrate material and fiber bragg gratings uniformly wound on the surface of the substrate material, and is used for detecting the operation state of the underground instrument; the optical fiber torsion sensing device winds around a drill pipe mandrel crosswise through the fiber bragg gratings and is used for obtaining torque of a drill pipe; a first centralizer is arranged at the upper end of the drill pipe, and a second centralizer is arranged at the lower end of the drill pipe; the first centralizer and the second centralizer are used for centralizing the drilling pipe by applying opposite force.
Description
Technical field
Downhole card point-measurement technique field of the present invention, surveys card particularly to a kind of down-hole equipped with fiber bragg grating sensing device
System.
Background technology
Generally, the accident of bit freezing can be run in drilling process, block, explode and release using survey when running into lock of tool drilling
Complete the extraction to stuck point above position down-hole equipment.Domestic sticking point instrument has introduced a collection of external skill in eighties of last century the eighties
Art, the development sticking point instrument with technology domesticizes at present completely, but the product producing for critical component does not reach survey
Card required precision, have impact on using and promoting of sticking point instrument.Recent years North China Niu Dongqu block high temperature well and Tarim, Xinjiang oil
After field hp-ht well generation in front of the mountains lock of tool drilling, existing sticking point instrument is not satisfied by survey card demand.Light quoted by optical fiber sticking point instrument
Fine technical substitution traditional inductance coil sensitivity pipe is strong to realize survey clipping technique, anti-electromagnetic effect ability, and stability is good, not only can
The use enough meeting normal temperature and pressure well is moreover it is possible to meet the application demand of domestic each oil field hp-ht well.But survey card in optical fiber
Technically yet suffer from surveying the relatively low situation of card precision.
In view of in drilling engineering, surveying, for lock of tool drilling, the feature that card precision has high demands, inventor is using for reference existing skill
On the basis of art, optical fiber sticking point instrument is improved.
Accordingly, it would be desirable to a kind of can effectively improve a kind of down-hole survey card equipped with fiber bragg grating sensing device surveying card precision
System.
Content of the invention
It is an object of the invention to provide card system, described system bag are surveyed in a kind of down-hole equipped with fiber bragg grating sensing device
Include downhole instrument and ground instrument, described downhole instrument includes cable connector, optical fiber magnetic orientation sensing device, optical fiber torsion sensing
Device and demolition set；
The optical fiber that described optical fiber magnetic orientation device includes base material and is equably wrapped in described substrate material surface
Grating, for detecting downhole instrument running status；
Described optical fiber torque sensor passes through fiber grating cross winding in drilling rod mandrel, for obtaining drilling rod moment of torsion；
Arrange the first centralizer in the upper end of described drilling rod, arrange the second centralizer in the lower end of described drilling rod；Described
One centralizer passes through to apply contrary power to described drilling rod righting with described second centralizer.
Preferably, described downhole instrument includes weighted lever and spring anchor, and described spring anchor is divided into spring anchor and lower spring
Anchor.
Preferably, described base material is column magnetic telescopic material.
Preferably, described ground instrument includes signal collection device and armored optical cable, and described armored optical cable connects described electricity
Cable joint.
Preferably, in drilling rod mandrel, the mode of described cross winding is coiling clockwise to described fiber grating cross winding
With coiling counterclockwise.
Preferably, described demolition set includes ignition control device, Power Fiber and the joints of optical fibre.
Preferably, described ignition control device includes laser instrument, laser focusing lens and bonder；
The described joints of optical fibre include isolated film and medicine chamber；Described Power Fiber is connected with described isolated film.
The invention provides card system is surveyed in a kind of down-hole equipped with fiber bragg grating sensing device, intersected by fiber grating
Mode is wrapped in drilling rod mandrel, and to measurement of torque on rolling shaft, it achieves more accurately survey card demand.
It should be appreciated that aforementioned description substantially and subsequently detailed description are exemplary illustration and explanation, should not
As the restriction to the claimed content of the present invention.
Brief description
With reference to the accompanying drawing enclosed, the more purpose of the present invention, function and advantage will be as follows by embodiment of the present invention
Description is illustrated, wherein:
Fig. 1 schematically shows the structural representation that card system is surveyed in down-hole of the present invention；
Fig. 2 shows that the fiber grating laying schematic diagram of card system is surveyed in down-hole of the present invention；
Fig. 3 shows that the demolition set schematic diagram of card system is surveyed in down-hole of the present invention；
Fig. 4 shows that the fiber grating winding schematic diagram of the optical fiber magnetic orientation device of card system is surveyed in down-hole of the present invention；
Fig. 5 shows that the fiber grating winding schematic diagram in the drilling rod axle center of card system is surveyed in down-hole of the present invention.
Specific embodiment
By reference to one exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to one exemplary embodiment disclosed below；Can by multi-form Lai
It is realized.The essence of description is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, embodiments of the invention will be described with reference to the drawings.In the accompanying drawings, identical reference represent identical
Or similar part, or same or similar step.
In the exemplary embodiment providing content of the invention of this paper description embodiment, refer to regard to device, structure, biography
The description such as induction device, cable, base material and connected mode is it should for one skilled in the art will readily appreciate that and can
The all implementations expected.
The structural representation of card system, Fig. 2 are surveyed in a kind of down-hole equipped with fiber bragg grating sensing device of the present invention as shown in Figure 1
The fiber grating laying schematic diagram of card system is surveyed in shown down-hole of the present invention.Ground instrument include signal collection device 101 (201) and
Armored optical cable 102 (202), described armored optical cable 102 (202) connection cable joint 104, signal collection device 101 (201) is passed through
Armored optical cable 102 (202) and downhole instrument carry out information transfer.Downhole instrument collects the stuck point positional information of drilling rod, will believe
Number it is transferred to ground instrument, ground instrument obtains down-hole concrete stuck point position to adjustment drilling rod after signal analysis.
Specifically, downhole instrument includes cable connector 104, optical fiber magnetic orientation sensing device 103, optical fiber in embodiments
Torque sensor 105 and demolition set 108 (210).
Cable connector is reached down-hole and is connected with each other with downhole instrument, and in certain embodiments, cable connector 103 is connected to light
The upper end of fine magnetic orientation device 103.In the present embodiment, cable connector 104 is connected to the lower end of optical fiber magnetic orientation device 103.
The light that described optical fiber magnetic orientation device includes base material 203 and is equably wrapped in described substrate material surface
Fine grating 204a, base material 203 is magnetic telescopic material, can be easy in some embodiments being wound around the post of fiber grating
Shape；It other embodiments can also be rectangular bulk.Described optical fiber positioning device 103 is used for detecting downhole instrument
Running status.
Downhole tool includes mandrel and sleeve, and the fiber grating 209 that armored optical cable 102 (202) stretches out connects optical fiber torsion
Sensing device 105, described optical fiber torque sensor 105 passes through fiber grating 204b cross winding in drilling rod mandrel 205, this
Bright be wound around fiber grating 204b in crossing manner in drilling rod mandrel 205 and be used for obtaining drilling rod moment of torsion as sensor, intersection twines
Around mode be coiling clockwise and coiling counterclockwise.The fiber grating of coiling and the fiber grating of coiling counterclockwise exist clockwise
It is subject to different stress to produce strain during drilling rod torsional deflection, calculus of differences is carried out to the strain of two optical fiber and is accurately bored
Bar moment of torsion.
Arrange the first centralizer 106 (206) in the upper end of described drilling rod, arrange the second centralizer in the lower end of described drilling rod
107 (207), described first centralizer second centralizer 107 (207) described with 106 (206) passes through to apply contrary power to described
Drilling rod righting.Armored optical cable 102 (202) stretches out Power Fiber 208, and Power Fiber connects to demolition set (108) 210.
In some embodiments, downhole instrument should also include weighted lever and spring anchor, and spring anchor is divided into spring anchor
With lower spring anchor.
As shown in Figure 3 the demolition set schematic diagram of card system is surveyed in down-hole of the present invention, demolition set include ignition control device,
Power Fiber 302 and the joints of optical fibre 303；
Described ignition control device includes laser instrument 301, laser focusing lens 304 and bonder 305；
The described joints of optical fibre 303 include isolated film 306 and medicine chamber 307；Power Fiber 302 and described isolated film
306 connections, equipped with the explosive for explosion in medicine chamber 307.
Laser instrument 301 output laser passes through laser focusing lens 304 to laser focusing, and the laser after focusing is through bonder
305 couplings reach the explosive in isolated film 306 primer chamber 307 through Power Fiber 302, and the stuck point of downhole tool is carried out
Release.In some specifically embodiment, the laser power of laser instrument 301 output is determined according to geological conditions, stuck point position.
In certain embodiments, laser power can be several milliwatts；In further embodiments, laser power can be several watts.
The fiber grating winding schematic diagram of the optical fiber magnetic orientation device of card system is surveyed in down-hole of the present invention as shown in Figure 4.This reality
Apply example and fiber grating magnetic orientation device is described taking column magnetic telescopic material as a example, on magnetic telescopic material 401 surface by fiber grating
402 uniform winding are it is preferable that by the way of spiral wrap.The distance between fiber grating is wound around, the present invention does not do
Limit.
When fiber grating magnetic orientation device passes through different down-hole strings different internal diameter, magnetic telescopic material is caused to deform, from
And cause fiber grating that dilatation occurs.The present invention, by way of spiral wrap, more accurately corrects and positioning well
The depth of lower instrument.
Fig. 5 shows that the fiber grating winding schematic diagram in the drilling rod axle center of card system is surveyed in down-hole of the present invention.To downhole tool
Inner spindle 501 is wound around fiber grating 502 as the torsion torque sensor of measurement stuck point, the light of coiling clockwise by the way of intersecting
The fiber grating of fine grating and coiling counterclockwise is all by the way of spiral uniform winding.When drilling rod torsional deflection, up time
The fiber grating of pin coiling is subject to different stress to produce strain from the fiber grating of coiling counterclockwise, the strain to two optical fiber
Carry out calculus of differences and obtain accurate drilling rod moment of torsion.
The invention provides card system is surveyed in a kind of down-hole equipped with fiber bragg grating sensing device, intersected by fiber grating
Mode is wrapped in drilling rod mandrel, and to measurement of torque on rolling shaft, it achieves more accurately survey card demand.
Explanation in conjunction with the present invention disclosing here and practice, the other embodiment of the present invention is for those skilled in the art
All will be readily apparent and understand.Illustrate and embodiment be to be considered only as exemplary, the true scope of the present invention and purport equal
It is defined in the claims.
Claims (7)
1. card system is surveyed in a kind of down-hole equipped with fiber bragg grating sensing device, and described system includes downhole instrument and ground instrument,
It is characterized in that, described downhole instrument includes cable connector, optical fiber magnetic orientation sensing device, optical fiber torque sensor and quick-fried
Breaking device；
The fiber grating that described optical fiber magnetic orientation device includes base material and is equably wrapped in described substrate material surface,
For detecting downhole instrument running status；
Described optical fiber torque sensor passes through fiber grating cross winding in drilling rod mandrel, for obtaining drilling rod moment of torsion；
Arrange the first centralizer in the upper end of described drilling rod, arrange the second centralizer in the lower end of described drilling rod；Described first helps
Positive device passes through to apply contrary power to described drilling rod righting with described second centralizer.
2. card system is surveyed it is characterised in that described downhole instrument also includes weighted lever and bullet in down-hole according to claim 1
Spring anchor, described spring anchor is divided into spring anchor and lower spring anchor.
3. card system is surveyed it is characterised in that described base material is the flexible material of column magnetic in down-hole according to claim 1
Material.
4. card system is surveyed it is characterised in that described ground instrument includes signal collection device in down-hole according to claim 1
And armored optical cable, the described armored optical cable described cable connector of connection.
5. card system is surveyed it is characterised in that described fiber grating cross winding is in drilling rod core in down-hole according to claim 1
Axle, the mode of described cross winding is coiling clockwise and coiling counterclockwise.
6. card system is surveyed it is characterised in that described demolition set includes IGNITION CONTROL dress in down-hole according to claim 1
Put, Power Fiber and the joints of optical fibre.
7. card system is surveyed it is characterised in that described ignition control device includes laser in the down-hole according to described in claim 6
Device, laser focusing lens and bonder；
The described joints of optical fibre include isolated film and medicine chamber；Described Power Fiber is connected with described isolated film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610847982.7A CN106351646B (en) | 2016-09-23 | 2016-09-23 | Underground card measuring system with fiber grating sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610847982.7A CN106351646B (en) | 2016-09-23 | 2016-09-23 | Underground card measuring system with fiber grating sensing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106351646A true CN106351646A (en) | 2017-01-25 |
| CN106351646B CN106351646B (en) | 2020-03-24 |
Family
ID=57858930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610847982.7A Active CN106351646B (en) | 2016-09-23 | 2016-09-23 | Underground card measuring system with fiber grating sensing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106351646B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111504352A (en) * | 2020-04-30 | 2020-08-07 | 湖北三江航天万峰科技发展有限公司 | Distributed multi-dimensional intelligent optical fiber sensing system |
| FR3097587A1 (en) * | 2019-06-21 | 2020-12-25 | Febus Optics | MAINTENANCE DEVICE AND METHOD FOR DETERMINING THE POSITION OF A BLOCKING POINT OF A TUBULAR ELEMENT |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3994163A (en) * | 1974-04-29 | 1976-11-30 | W. R. Grace & Co. | Stuck well pipe apparatus |
| IE52218B1 (en) * | 1980-12-31 | 1987-08-05 | Schlumberger Ltd | Method and apparatus for detecting the stuck point of a conduit in a borehole |
| CN2599557Y (en) * | 2002-12-18 | 2004-01-14 | 南开大学 | Bidirectional torsioning optical fibre sensor |
| CN200985787Y (en) * | 2006-12-14 | 2007-12-05 | 中国石油天然气集团公司 | Instrumentation for measuring casing coupling with fiber optic sensor |
| JP2009264748A (en) * | 2008-04-21 | 2009-11-12 | Fujikura Ltd | Optical fiber cable for pressure sensor |
| CN201535705U (en) * | 2009-04-23 | 2010-07-28 | 大连理工大学 | Fiber bragg grating pipeline stress hoop |
| WO2013147996A2 (en) * | 2012-03-28 | 2013-10-03 | Halliburton Energy Services, Inc. ("HESI") | Optical casing collar locator systems and methods |
| US20130298697A1 (en) * | 2009-07-13 | 2013-11-14 | Leroy C. Delatorre | Pressure isolated fiber optic torque sensor |
| CN103449943A (en) * | 2013-06-13 | 2013-12-18 | 中国科学技术大学 | Device for stimulating micro-jet by laser and detonator using same |
| CN104499512A (en) * | 2014-12-19 | 2015-04-08 | 浙江华东工程安全技术有限公司 | Monitoring system of body three-dimensional strains and force parameters of foundation pile and measuring method of body three-dimensional strain and force parameters of foundation pile |
| CN104695893A (en) * | 2013-12-09 | 2015-06-10 | 中国石油化工股份有限公司 | Packer rubber tube contact stress test device and method |
| US20150285626A1 (en) * | 2012-11-30 | 2015-10-08 | Neubrex Co., Ltd. | Three-dimensional position measurement system |
| EP2470750B1 (en) * | 2009-08-24 | 2016-07-13 | Baker Hughes Incorporated | Fiber optic inner string position sensor system |
-
2016
- 2016-09-23 CN CN201610847982.7A patent/CN106351646B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3994163A (en) * | 1974-04-29 | 1976-11-30 | W. R. Grace & Co. | Stuck well pipe apparatus |
| IE52218B1 (en) * | 1980-12-31 | 1987-08-05 | Schlumberger Ltd | Method and apparatus for detecting the stuck point of a conduit in a borehole |
| CN2599557Y (en) * | 2002-12-18 | 2004-01-14 | 南开大学 | Bidirectional torsioning optical fibre sensor |
| CN200985787Y (en) * | 2006-12-14 | 2007-12-05 | 中国石油天然气集团公司 | Instrumentation for measuring casing coupling with fiber optic sensor |
| JP2009264748A (en) * | 2008-04-21 | 2009-11-12 | Fujikura Ltd | Optical fiber cable for pressure sensor |
| CN201535705U (en) * | 2009-04-23 | 2010-07-28 | 大连理工大学 | Fiber bragg grating pipeline stress hoop |
| US20130298697A1 (en) * | 2009-07-13 | 2013-11-14 | Leroy C. Delatorre | Pressure isolated fiber optic torque sensor |
| EP2470750B1 (en) * | 2009-08-24 | 2016-07-13 | Baker Hughes Incorporated | Fiber optic inner string position sensor system |
| WO2013147996A2 (en) * | 2012-03-28 | 2013-10-03 | Halliburton Energy Services, Inc. ("HESI") | Optical casing collar locator systems and methods |
| US20150285626A1 (en) * | 2012-11-30 | 2015-10-08 | Neubrex Co., Ltd. | Three-dimensional position measurement system |
| CN103449943A (en) * | 2013-06-13 | 2013-12-18 | 中国科学技术大学 | Device for stimulating micro-jet by laser and detonator using same |
| CN104695893A (en) * | 2013-12-09 | 2015-06-10 | 中国石油化工股份有限公司 | Packer rubber tube contact stress test device and method |
| CN104499512A (en) * | 2014-12-19 | 2015-04-08 | 浙江华东工程安全技术有限公司 | Monitoring system of body three-dimensional strains and force parameters of foundation pile and measuring method of body three-dimensional strain and force parameters of foundation pile |
Non-Patent Citations (1)
| Title |
|---|
| 张敬伟等: "《大学物理实验》", 31 December 2002, 大连海事大学出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3097587A1 (en) * | 2019-06-21 | 2020-12-25 | Febus Optics | MAINTENANCE DEVICE AND METHOD FOR DETERMINING THE POSITION OF A BLOCKING POINT OF A TUBULAR ELEMENT |
| EP3757349A1 (en) | 2019-06-21 | 2020-12-30 | Febus Optics | Maintenance device and method for determining the position of a locking point for a tubular element |
| US11384634B2 (en) | 2019-06-21 | 2022-07-12 | Febus Optics | Maintenance device and method for determining the position of a blockage point of a tubular member |
| CN111504352A (en) * | 2020-04-30 | 2020-08-07 | 湖北三江航天万峰科技发展有限公司 | Distributed multi-dimensional intelligent optical fiber sensing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106351646B (en) | 2020-03-24 |
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