CN104500035A - Method for improving precision of on-line stress detection data of underground casing string distributive optical fiber - Google Patents
Method for improving precision of on-line stress detection data of underground casing string distributive optical fiber Download PDFInfo
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- CN104500035A CN104500035A CN201410753787.9A CN201410753787A CN104500035A CN 104500035 A CN104500035 A CN 104500035A CN 201410753787 A CN201410753787 A CN 201410753787A CN 104500035 A CN104500035 A CN 104500035A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 101
- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 21
- 210000002445 nipple Anatomy 0.000 claims abstract description 175
- 238000012360 testing method Methods 0.000 claims abstract description 95
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 8
- 238000007405 data analysis Methods 0.000 claims description 7
- 230000005483 Hooke's law Effects 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 11
- 230000002411 adverse Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 230000009931 harmful effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
Classifications
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- 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
- E21B47/007—Measuring stresses in a pipe string or casing
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- 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)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the technical field of an oil gas well underground casing string stress detection method, in particular to a method for improving the precision of on-line stress detection data of underground casing string distributive optical fiber. The method is carried out according to the following steps that 1, a connecting-in type nipple is fixedly arranged between at least one pair of adjacent casing pipes, the other adjacent casing pipes are fixedly installed together, at least two optical fibers which are in a U shape and are symmetrical in the axial direction are fixedly arranged at the outer side of the casing pipes at intervals, one section of the optical fibers is fixedly arranged on the casing pipes in a spiral shape, the signal output ends of the optical fibers are electrically connected with the signal input end of a strain test device, and the signal input ends of the optical fibers are electrically connected with the signal output end of the strain test device. The method has the advantages that the adverse influence caused by the introduction of the connecting-in type nipples on strain test data is eliminated, meanwhile, the interference of cement rings on the strain data collected by the optical fibers is eliminated, the test precision of the whole-well-section casing string stain data obtained through detection is improved.
Description
Technical field
the present invention relates to Oil/gas Well down-hole casing post stress mornitoring method and technology field, is a kind of method improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic.
Background technology
distributed Detection optical fiber is used for the on-line real-time measuremen of Oil/gas Well down-hole military service casing string stress, is a novel detection technique grown up in the recent period.This technology is detected by the real-time continuous of omnidistance stress state of being on active service to Oil/gas Well down-hole military service casing string, obtain the actual stress state of down-hole casing post, for the mechanical strength design of Oil/gas Well down-hole casing post provides first hand detection data, for guaranteeing that the safe and reliable and rational in infrastructure of Oil/gas Well down-hole casing post provides direct design considerations.
the mode that Distributed Detection optical fiber can only adopt the later stage to lay on Oil/gas Well down-hole casing post is installed, and its mounting means is clamped by Distributed Detection fiber segment and be attached on the external cylindrical surface of casing string.When after Oil/gas Well cementing, when annular space thes cement solidifies, because the Distributed Detection optical fiber be laid on casing string external cylindrical surface is between cement sheath and casing string, when down-hole casing post generation strain deformation, be laid on Distributed Detection optical fiber on casing string external cylindrical surface along with casing string generation strain deformation, but the strain data adopting Distributed Detection optical fiber to obtain produces test error owing to being subject to the impact of cement sheath, reduces the accuracy of detection of Distributed Detection optical fiber to down-hole casing post strain data.
Summary of the invention
the invention provides a kind of method improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic, overcome the deficiency of above-mentioned prior art, when adopting existing Distributed Detection optical fiber to gather down-hole casing post strain data, it effectively can solve the problem that the down-hole casing post strain data recorded that the interference of cement sheath to Distributed Detection optical fiber cause exists test error.
technical scheme of the present invention is realized by following measures: a kind of method improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic, carry out in the steps below: the first step, between the sleeve pipe that at least one pair of is adjacent, formula pipe nipple is linked in fixed installation, all the other adjacent sleeve pipes are fixedly installed togather, at the optical fiber that outside spacers fixed installation at least two difference of sleeve pipe are U-shaped and axially symmetrical, one section of optical fiber is fixedly mounted on sleeve pipe in the shape of a spiral, the signal output part of optical fiber and the signal input part of strain detection testing device are electrically connected, the signal input part of optical fiber and the signal output part of strain detection testing device are electrically connected, by sleeve pipe with link G.I.H together with formula pipe nipple, the outside of sleeve recording down-hole by strain detection testing device and the strain data linked outside formula pipe nipple, second step, between the sleeve pipe that at least one pair of is adjacent, formula pipe nipple is linked in fixed installation, all the other adjacent sleeve pipes are fixedly installed togather, at the optical fiber that outside spacers fixed installation at least two difference of sleeve pipe are U-shaped and axially symmetrical, one section of optical fiber is fixedly mounted on sleeve pipe in the shape of a spiral, the signal output part of optical fiber and the signal input part of strain detection testing device are electrically connected, the signal input part of optical fiber and the signal output part of strain detection testing device are electrically connected, identical axial tensile loads is applied to sleeve pipe and the formula pipe nipple of linking outside well, carries out simulated test, the outside of sleeve recording simulated test by strain detection testing device and the strain data linked outside formula pipe nipple, then, the outside of sleeve outside of sleeve of simulated test and the strain data linked outside formula pipe nipple being separately converted to simulated test and the load data linked outside formula pipe nipple, then, by the load data outside formula of the linking pipe nipple of axial tensile loads and simulated test after data analysis, index of correlation A between load data outside formula of the linking pipe nipple of acquisition axial tensile loads and simulated test, index of correlation A obtains according to Mathematical Modeling expression formula y=Ax, simultaneously, by the outside of sleeve of simulated test with link load data outside formula pipe nipple after data analysis, index of correlation B between the load data of the load outside formula of the linking pipe nipple of acquisition simulated test and the outside of sleeve of simulated test, index of correlation B obtains according to Mathematical Modeling expression formula m=Bx, wherein: y is axial tensile loads data, x is the load data outside formula of the linking pipe nipple of simulated test, m is the load data of the outside of sleeve of simulated test, 0 < A < 10, 0 < B < 10, 3rd step, correction strain data outside formula of the linking pipe nipple obtaining down-hole after the strain data outside formula of the linking pipe nipple of the down-hole obtained in a first step being corrected with index of correlation A, then, with the correction strain data outside formula of the linking pipe nipple of down-hole for correcting basic point data, the correction strain data of the outside of sleeve of down-hole is obtained after correcting by correction basic point data and the strain data of index of correlation B to the outside of sleeve of the down-hole obtained in a first step, finally, the correction strain data of the outside of sleeve of down-hole is converted into the correction load data of the outside of sleeve of down-hole.
here is the further optimization and/or improvements to foregoing invention technical scheme:
above-mentioned strain data can be converted into load data according to the expression formula of Hooke's law, and the expression formula of Hooke's law is σ=Е × ε, and wherein: σ is load value, ε is strain value, and Е is modulus of elasticity, and Е is constant.
above-mentioned optical fiber can be two, and an optical fiber and another 90 degree, root optical fiber interval are distributed in sleeve pipe and link on formula pipe nipple, and the two ends being positioned at each the root optical fiber on same cross section distribute axisymmetricly, and the lead angle of spiral optical fiber is 45 degree.
above-mentioned formula pipe nipple of linking can be formula of linking and detects pipe nipple, detects optical fiber corresponding to pipe nipple be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and detect optical cable and imbed groove with formula of linking; Or link formula pipe nipple for linking formula test nipple joint, one section of optical fiber is fixedly mounted in the shape of a spiral and links on formula test nipple joint.
above-mentioned formula pipe nipple of linking can be formula of linking and detects pipe nipple and link formula test nipple joint, between the sleeve pipe that at least one pair of is adjacent, be installed with formula of linking detect pipe nipple, detect optical fiber corresponding to pipe nipple with formula of linking to be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and to detect optical cable and imbed groove, be installed with and link formula test nipple joint between at least one pair of adjacent sleeve pipe in residue sleeve pipe, one section of optical fiber is fixedly mounted in the shape of a spiral and links on formula test nipple joint.
above-mentioned formula test nipple joint of linking can comprise nipple body, through hole is had in the inner side of nipple body, outer lug boss is had outside the middle part of nipple body, outer lug boss is intervally distributed with about at least four to communicate and groove imbedded by spiral optical fiber, optical fiber is fixedly mounted on optical fiber by consolidating agent and imbeds in groove, has external screw thread or internal thread in the upper and lower of nipple body.
the lead angle that groove imbedded by above-mentioned each optical fiber can be 45 degree, and the import that groove upper end imbedded by each optical fiber is corresponding up and down with the outlet of its lower end; Or/and 90 degree, interval is distributed with four optical fiber and imbeds groove in above-mentioned outer lug boss; Or/and the cross section that groove imbedded by optical fiber is opening toward the outer side U-shaped; Or/and the top of outer lug boss is up-narrow and down-wide taper type, the bottom of outer lug boss is taper type wide at the top and narrow at the bottom; Or/and, internal thread is arranged at the top of nipple body, have external screw thread in the bottom of nipple body, the top of the sleeve pipe and nipple body that are positioned at nipple body top is fixedly installed togather by screw thread, and the bottom of the sleeve pipe and nipple body that are positioned at nipple body bottom is fixedly installed togather by screw thread.
in the present invention, cement sheath and optical fiber can be isolated by the setting of linking formula pipe nipple, by the index of correlation B that simulated test obtains the index of correlation A between sleeve pipe real load and the load linking formula pipe nipple and links between the load of formula pipe nipple and the load of sleeve pipe, obtain correcting basic point data after adopting index of correlation A to correct the strain data that formula pipe nipple is linked in the down-hole recorded, then, obtain correcting strain data after correcting by correction basic point data and the strain data of index of correlation B to the down-hole casing recorded, thereby eliminate the harmful effect that the introducing of linking formula pipe nipple causes strain test data, eliminate simultaneously cement sheath to collecting fiber to the interference that causes of strain data, improve the measuring accuracy detecting the full well section casing string strain data obtained.
Accompanying drawing explanation
accompanying drawing 1 is that the master of each parts in the present invention looks sectional structure schematic diagram.
accompanying drawing 2 is that the master linking formula test nipple joint in the present invention looks half section structural representation.
accompanying drawing 3 be A-A after laying optical fiber in accompanying drawing 2 to sectional structure schematic diagram.
coding in accompanying drawing is respectively: 1 for linking formula pipe nipple, and 2 is sleeve pipe, and 3 is optical fiber, and 4 is strain detection testing device, and 5 is nipple body, and 6 is through hole, and 7 is outer lug boss, and 8 imbed groove for optical fiber, and 9 is cement sheath.
Detailed description of the invention
the present invention by the restriction of following embodiment, can not determine concrete embodiment according to technical scheme of the present invention and actual conditions.
in invention, for convenience of description, the description of the relative position relation of each parts is all be described according to the Butut mode of Figure of description 1 in an embodiment, as: the position relationship of upper and lower, left and right etc. determines according to the Butut direction of Figure of description.
below in conjunction with embodiment, the invention will be further described:
embodiment 1: as shown in accompanying drawing 1 to 3, the method of the online stress mornitoring data precision of this raising down-hole casing post distribution type fiber-optic is carried out in the steps below: the first step, between the sleeve pipe 2 that at least one pair of is adjacent, formula pipe nipple 1 is linked in fixed installation, all the other adjacent sleeve pipes 2 are fixedly installed togather, at the optical fiber 3 that outside spacers fixed installation at least two difference of sleeve pipe 2 are U-shaped and axially symmetrical, one section of optical fiber 3 is fixedly mounted on sleeve pipe 2 in the shape of a spiral, the signal output part of optical fiber 3 and the signal input part of strain detection testing device 4 are electrically connected, the signal input part of optical fiber 3 and the signal output part of strain detection testing device 4 are electrically connected, by sleeve pipe 2 with link G.I.H together with formula pipe nipple 1, outside the sleeve pipe 2 being recorded down-hole by strain detection testing device 4 and the strain data linked outside formula pipe nipple 1, second step, between the sleeve pipe 2 that at least one pair of is adjacent, formula pipe nipple 1 is linked in fixed installation, all the other adjacent sleeve pipes 2 are fixedly installed togather, at the optical fiber 3 that outside spacers fixed installation at least two difference of sleeve pipe 2 are U-shaped and axially symmetrical, one section of optical fiber 3 is fixedly mounted on sleeve pipe 2 in the shape of a spiral, the signal output part of optical fiber 3 and the signal input part of strain detection testing device 4 are electrically connected, the signal input part of optical fiber 3 and the signal output part of strain detection testing device 4 are electrically connected, to sleeve pipe 2 and link formula pipe nipple 1 and apply identical axial tensile loads carry out simulated test outside well, outside the sleeve pipe 2 being recorded simulated test by strain detection testing device 4 and the strain data linked outside formula pipe nipple 1, then, by outside the sleeve pipe 2 of simulated test and the strain data linked outside formula pipe nipple 1 be separately converted to simulated test sleeve pipe 2 outside and the load data linked outside formula pipe nipple 1, then, by the load data outside formula of the linking pipe nipple 1 of axial tensile loads and simulated test after data analysis, index of correlation A between load data outside formula of the linking pipe nipple 1 of acquisition axial tensile loads and simulated test, index of correlation A obtains according to Mathematical Modeling expression formula y=Ax, simultaneously, by outside the sleeve pipe 2 of simulated test and link load data outside formula pipe nipple 1 after data analysis, obtain simulated test formula of linking pipe nipple 1 outside load and simulated test sleeve pipe 2 outside load data between index of correlation B, index of correlation B obtains according to Mathematical Modeling expression formula m=Bx, wherein: y is axial tensile loads data, x is the load data outside formula of the linking pipe nipple of simulated test, m is the load data of the outside of sleeve of simulated test, 0 < A < 10, 0 < B < 10, 3rd step, correction strain data outside formula of the linking pipe nipple 1 obtaining down-hole after the strain data outside formula of the linking pipe nipple 1 of the down-hole obtained in a first step being corrected with index of correlation A, then, with the correction strain data outside formula of the linking pipe nipple 1 of down-hole for correcting basic point data, with the correction strain data corrected outside the sleeve pipe 2 obtaining down-hole after basic point data and index of correlation B correct the strain data outside the sleeve pipe 2 of the down-hole obtained in a first step, finally, correction load data outside the sleeve pipe 2 correction strain data outside the sleeve pipe 2 of down-hole being converted into down-hole.By the index of correlation B that simulated test obtains the index of correlation A between sleeve pipe real load (axial tensile loads) and the load linking formula pipe nipple 1 and links between the load of formula pipe nipple 1 and the load of sleeve pipe 2, obtain correcting basic point data after adopting index of correlation A to correct the strain data that formula pipe nipple 1 is linked in the down-hole recorded, then, obtain correcting strain data after correcting by correction basic point data and the strain data of index of correlation B to the down-hole casing 2 recorded, thereby eliminate the harmful effect that the introducing of linking formula pipe nipple 1 causes strain test data, eliminate the interference that strain data that cement sheath 9 pairs of optical fiber 3 collect causes simultaneously, improve the measuring accuracy detecting the full well section casing string strain data obtained, strain detection testing device 4 is existing known technology.
embodiment 2: as required, as the optimization of above-described embodiment, strain data is converted into load data according to the expression formula of Hooke's law, the expression formula of Hooke's law is σ=Е × ε, and wherein: σ is load value, ε is strain value, Е is modulus of elasticity, and Е is constant; Or/and the data analysis mode in second step is that Linear correlative analysis is or/and nonlinear correlation analysis.
embodiment 3: as shown in accompanying drawing 1 to 3, as the optimization of above-described embodiment, optical fiber 3 is two, an optical fiber 3 and another 90 degree, root optical fiber 3 interval are distributed in sleeve pipe 2 and link on formula pipe nipple 1, the two ends being positioned at each the root optical fiber 3 on same cross section distribute axisymmetricly, and the lead angle of spiral optical fiber 3 is 45 degree.
embodiment 4: as shown in accompanying drawing 1 to 3, as the optimization of above-described embodiment, links formula pipe nipple 1 and detects pipe nipple for linking formula, detects optical fiber corresponding to pipe nipple 3 be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and detect optical cable and imbed groove with formula of linking; Or link formula pipe nipple 1 for linking formula test nipple joint, one section of optical fiber 3 is fixedly mounted in the shape of a spiral and links on formula test nipple joint.Formula of linking detects pipe nipple or the selection of linking formula test nipple joint needs according to the test of deformation type data and selects, and when only needing to investigate axial strain, linking formula pipe nipple 1 and detecting pipe nipple for linking formula; When needs investigate axial strain or radial strain, link formula pipe nipple 1 for linking formula test nipple joint; When needs investigate axial strain and radial strain, link formula pipe nipple 1 for linking formula test nipple joint; Formula of linking detects pipe nipple and adopts notification number to be technology in the Chinese patent literature of CN 203223216 U.The method adopting introducing to correct basic point strain data eliminates the harmful effect that consolidating agent causes strain test data.
embodiment 5: as shown in accompanying drawing 1 to 3, as the optimization of above-described embodiment, link formula pipe nipple 1 detect pipe nipple for linking formula and link formula test nipple joint, between the sleeve pipe 2 that at least one pair of is adjacent, be installed with formula of linking detect pipe nipple, detect optical fiber corresponding to pipe nipple 3 with formula of linking to be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and to detect optical cable and imbed groove, be installed with and link formula test nipple joint between at least one pair of adjacent sleeve pipe 2 in residue sleeve pipe 2, one section of optical fiber 3 is fixedly mounted in the shape of a spiral and links on formula test nipple joint.Formula of linking detects pipe nipple and links combinationally using of formula test nipple joint and is decided according to the actual requirements.
embodiment 6: as shown in accompanying drawing 1 to 3, be with the difference of above-described embodiment, the formula test nipple joint of linking comprises nipple body 5, through hole 6 is had in the inner side of nipple body 5, outer lug boss 7 is had outside the middle part of nipple body 5, outer lug boss 7 is intervally distributed with about at least four to communicate and groove 8 imbedded by spiral optical fiber, optical fiber 3 is fixedly mounted on optical fiber by consolidating agent and imbeds in groove 8, has external screw thread or internal thread in the upper and lower of nipple body 5.Cement sheath 9 and detection fiber can be isolated by the setting that groove 8 imbedded by optical fiber, the interference that the strain data avoiding cement sheath 9 pairs of detection fiber to collect causes.
embodiment 7: as shown in accompanying drawing 1 to 3, is with the difference of above-described embodiment, and the lead angle that groove 8 imbedded by each optical fiber is 45 degree, and the import that groove 8 upper end imbedded by each optical fiber is corresponding up and down with the outlet of its lower end; Or/and 90 degree, interval is distributed with four optical fiber and imbeds groove 8 in outer lug boss 7; Or/and the cross section that groove 8 imbedded by optical fiber is opening toward the outer side U-shaped; Or/and the top of outer lug boss 7 is up-narrow and down-wide taper type, the bottom of outer lug boss 7 is taper type wide at the top and narrow at the bottom; Or/and, internal thread is arranged at the top of nipple body 5, external screw thread is had in the bottom of nipple body 5, the sleeve pipe 2 being positioned at nipple body 5 top is fixedly installed togather by screw thread with the top of nipple body 5, and the sleeve pipe 2 being positioned at nipple body 5 bottom is fixedly installed togather by screw thread with the bottom of nipple body 5.Each optical fiber import of imbedding groove 8 upper end setting corresponding up and down with the outlet of its lower end can ensure two uniformity that saves the laying orientation of measuring fiber sleeve pipe 2 on adjacent with linking formula test nipple joint, further increases the measuring accuracy of the casing string strain data of detection acquisition.
above technical characteristic constitutes embodiments of the invention, and it has stronger compliance and implementation result, can increase and decrease non-essential technical characteristic according to actual needs, meet the demand of different situations.
Claims (10)
1. one kind is improved the method for the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic, it is characterized in that carrying out in the steps below: the first step, between the sleeve pipe that at least one pair of is adjacent, formula pipe nipple is linked in fixed installation, all the other adjacent sleeve pipes are fixedly installed togather, at the optical fiber that outside spacers fixed installation at least two difference of sleeve pipe are U-shaped and axially symmetrical, one section of optical fiber is fixedly mounted on sleeve pipe in the shape of a spiral, the signal output part of optical fiber and the signal input part of strain detection testing device are electrically connected, the signal input part of optical fiber and the signal output part of strain detection testing device are electrically connected, by sleeve pipe with link G.I.H together with formula pipe nipple, the outside of sleeve recording down-hole by strain detection testing device and the strain data linked outside formula pipe nipple, second step, between the sleeve pipe that at least one pair of is adjacent, formula pipe nipple is linked in fixed installation, all the other adjacent sleeve pipes are fixedly installed togather, at the optical fiber that outside spacers fixed installation at least two difference of sleeve pipe are U-shaped and axially symmetrical, one section of optical fiber is fixedly mounted on sleeve pipe in the shape of a spiral, the signal output part of optical fiber and the signal input part of strain detection testing device are electrically connected, the signal input part of optical fiber and the signal output part of strain detection testing device are electrically connected, identical axial tensile loads is applied to sleeve pipe and the formula pipe nipple of linking outside well, carries out simulated test, the outside of sleeve recording simulated test by strain detection testing device and the strain data linked outside formula pipe nipple, then, the outside of sleeve outside of sleeve of simulated test and the strain data linked outside formula pipe nipple being separately converted to simulated test and the load data linked outside formula pipe nipple, then, by the load data outside formula of the linking pipe nipple of axial tensile loads and simulated test after data analysis, index of correlation A between load data outside formula of the linking pipe nipple of acquisition axial tensile loads and simulated test, index of correlation A obtains according to Mathematical Modeling expression formula y=Ax, simultaneously, by the outside of sleeve of simulated test with link load data outside formula pipe nipple after data analysis, index of correlation B between the load data of the load outside formula of the linking pipe nipple of acquisition simulated test and the outside of sleeve of simulated test, index of correlation B obtains according to Mathematical Modeling expression formula m=Bx, wherein: y is axial tensile loads data, x is the load data outside formula of the linking pipe nipple of simulated test, m is the load data of the outside of sleeve of simulated test, 0 < A < 10, 0 < B < 10, 3rd step, correction strain data outside formula of the linking pipe nipple obtaining down-hole after the strain data outside formula of the linking pipe nipple of the down-hole obtained in a first step being corrected with index of correlation A, then, with the correction strain data outside formula of the linking pipe nipple of down-hole for correcting basic point data, the correction strain data of the outside of sleeve of down-hole is obtained after correcting by correction basic point data and the strain data of index of correlation B to the outside of sleeve of the down-hole obtained in a first step, finally, the correction strain data of the outside of sleeve of down-hole is converted into the correction load data of the outside of sleeve of down-hole.
2. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 1, it is characterized in that strain data is converted into load data according to the expression formula of Hooke's law, the expression formula of Hooke's law is σ=Е × ε, wherein: σ is load value, ε is strain value, Е is modulus of elasticity, and Е is constant.
3. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 1 and 2, it is characterized in that optical fiber is two, an optical fiber and another 90 degree, root optical fiber interval are distributed in sleeve pipe and link on formula pipe nipple, the two ends being positioned at each the root optical fiber on same cross section distribute axisymmetricly, and the lead angle of spiral optical fiber is 45 degree.
4. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 1 and 2, it is characterized in that linking formula pipe nipple and detect pipe nipple for linking formula, detect optical fiber corresponding to pipe nipple with formula of linking and be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and detect optical cable and imbed groove; Or link formula pipe nipple for linking formula test nipple joint, one section of optical fiber is fixedly mounted in the shape of a spiral and links on formula test nipple joint.
5. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 3, it is characterized in that linking formula pipe nipple and detect pipe nipple for linking formula, detect optical fiber corresponding to pipe nipple with formula of linking and be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and detect optical cable and imbed groove; Or link formula pipe nipple for linking formula test nipple joint, one section of optical fiber is fixedly mounted in the shape of a spiral and links on formula test nipple joint.
6. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 1 and 2, it is characterized in that linking formula pipe nipple detects pipe nipple for linking formula and link formula test nipple joint, between the sleeve pipe that at least one pair of is adjacent, be installed with formula of linking detect pipe nipple, detect optical fiber corresponding to pipe nipple with formula of linking to be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and to detect optical cable and imbed groove, be installed with between at least one pair of adjacent sleeve pipe in residue sleeve pipe and link formula test nipple joint, one section of optical fiber is fixedly mounted in the shape of a spiral and links on formula test nipple joint.
7. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 3, it is characterized in that linking formula pipe nipple detects pipe nipple for linking formula and link formula test nipple joint, between the sleeve pipe that at least one pair of is adjacent, be installed with formula of linking detect pipe nipple, detect optical fiber corresponding to pipe nipple with formula of linking to be fixedly mounted on by consolidating agent axis that formula of linking detects pipe nipple and to detect optical cable and imbed groove, be installed with between at least one pair of adjacent sleeve pipe in residue sleeve pipe and link formula test nipple joint, one section of optical fiber is fixedly mounted in the shape of a spiral and links on formula test nipple joint.
8. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 4 or 5 or 7, it is characterized in that linking formula test nipple joint comprises nipple body, through hole is had in the inner side of nipple body, outer lug boss is had outside the middle part of nipple body, outer lug boss is intervally distributed with about at least four to communicate and groove imbedded by spiral optical fiber, optical fiber is fixedly mounted on optical fiber by consolidating agent and imbeds in groove, has external screw thread or internal thread in the upper and lower of nipple body.
9. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 6, it is characterized in that linking formula test nipple joint comprises nipple body, through hole is had in the inner side of nipple body, outer lug boss is had outside the middle part of nipple body, outer lug boss is intervally distributed with about at least four to communicate and groove imbedded by spiral optical fiber, optical fiber is fixedly mounted on optical fiber by consolidating agent and imbeds in groove, has external screw thread or internal thread in the upper and lower of nipple body.
10. the method for the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic according to claim 8 or claim 9, it is characterized in that the lead angle that groove imbedded by each optical fiber is 45 degree, the import that groove upper end imbedded by each optical fiber is corresponding up and down with the outlet of its lower end; Or/and 90 degree, interval is distributed with four optical fiber and imbeds groove in outer lug boss; Or/and the cross section that groove imbedded by optical fiber is opening toward the outer side U-shaped; Or/and the top of outer lug boss is up-narrow and down-wide taper type, the bottom of outer lug boss is taper type wide at the top and narrow at the bottom; Or/and, internal thread is arranged at the top of nipple body, have external screw thread in the bottom of nipple body, the top of the sleeve pipe and nipple body that are positioned at nipple body top is fixedly installed togather by screw thread, and the bottom of the sleeve pipe and nipple body that are positioned at nipple body bottom is fixedly installed togather by screw thread.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410753787.9A CN104500035B (en) | 2014-12-09 | 2014-12-09 | The method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic |
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| CN201410753787.9A CN104500035B (en) | 2014-12-09 | 2014-12-09 | The method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic |
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| CN104500035B CN104500035B (en) | 2017-09-29 |
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