CN104500035B - The method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic - Google Patents
The method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic Download PDFInfo
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- CN104500035B CN104500035B CN201410753787.9A CN201410753787A CN104500035B CN 104500035 B CN104500035 B CN 104500035B CN 201410753787 A CN201410753787 A CN 201410753787A CN 104500035 B CN104500035 B CN 104500035B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/007—Measuring stresses in a pipe string or casing
Abstract
The present invention relates to Oil/gas Well down-hole casing post stress mornitoring method and technology field, it is a kind of method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic, carries out in the steps below：The first step, it is fixedly mounted between at least one pair of adjacent sleeve pipe and is connected to formula pipe nipple, remaining adjacent sleeve pipe is fixedly installed togather, the U-shaped and axially symmetric optical fiber of at least two difference is fixedly mounted in the outside spacers of sleeve pipe, 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, and the signal input part of optical fiber and the signal output part of strain detection testing device are electrically connected.Eliminated in the present invention and be connected to the harmful effect that the introducing of formula pipe nipple is caused to strain test data, at the same eliminate cement sheath to collecting fiber to the interference that causes of strain data, improve the measuring accuracy for the full well section casing string strain data that detection is obtained.
Description
Technical field
It is that a kind of down-hole casing post that improves divides the present invention relates to Oil/gas Well down-hole casing post stress mornitoring method and technology field
The method of the online stress mornitoring data precision of cloth optical fiber.
Background technology
Distributed Detection optical fiber is used for the on-line real-time measuremen of Oil/gas Well underground military service casing string stress, is a hair in the recent period
The new detection technique that exhibition is got up.This technology passes through the real-time of whole stress state of being on active service to Oil/gas Well underground military service casing string
Continuous detection, obtains the actual stress state of down-hole casing post, and the is provided for the mechanical strength design of Oil/gas Well down-hole casing post
The detection data of proficiency, to ensure the safe and reliable and rational in infrastructure direct design considerations of offer of Oil/gas Well down-hole casing post.
Distributed Detection optical fiber can only be installed on Oil/gas Well down-hole casing post by the way of the later stage lays, and it is pacified
Dress mode is by Distributed Detection fiber segment clamp and is attached on the external cylindrical surface of casing string.After Oil/gas Well cementing,
When annular space thes cement solidifies, due to the Distributed Detection optical fiber that is laid on casing string external cylindrical surface be in cement sheath and casing string it
Between, when strain deformation occurs for down-hole casing post, the Distributed Detection optical fiber on casing string external cylindrical surface is laid on sleeve pipe
Strain deformation occurs for post, but the strain data obtained using Distributed Detection optical fiber produces survey due to being influenceed by cement sheath
Error is tried, accuracy of detection of the Distributed Detection optical fiber to down-hole casing post strain data is reduced.
The content of the invention
The invention provides a kind of method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic, gram
The deficiency of above-mentioned prior art has been taken, when being acquired using existing Distributed Detection optical fiber to down-hole casing post strain data,
It can effectively solve the down-hole casing post strain data measured the presence survey that interference of the cement sheath to Distributed Detection optical fiber is caused
The problem of trying error.
The technical scheme is that realized by following measures：One kind improves down-hole casing post distribution type fiber-optic and existed
The method that uniaxial stress detects data precision, is carried out in the steps below：The first step, the fixed peace between at least one pair of adjacent sleeve pipe
Dress is connected to formula pipe nipple, and remaining adjacent sleeve pipe is fixedly installed togather, and at least two pieces points are fixedly mounted in the outside spacers of sleeve pipe
Not U-shaped and axially symmetric optical fiber, one section of optical fiber is fixedly mounted on sleeve pipe in the shape of a spiral, the signal output part of optical fiber with
The signal input part of strain detection testing device is electrically connected, the signal input part of optical fiber and the signal output of strain detection testing device
End is electrically connected, and sleeve pipe and will be connected to formula pipe nipple G.I.H together, the sleeve pipe of underground is measured by strain detection testing device
Outside and the strain data being connected on the outside of formula pipe nipple；Second step, is fixedly mounted between at least one pair of adjacent sleeve pipe and is connected to formula
Pipe nipple, remaining adjacent sleeve pipe is fixedly installed togather, and it is U-shaped simultaneously that at least two difference are fixedly mounted in the outside spacers of sleeve pipe
Axially symmetric optical fiber, one section of optical fiber is fixedly mounted on sleeve pipe in the shape of a spiral, the signal output part and strain testing of optical fiber
The signal input part of device is electrically connected, and the signal input part of optical fiber is electrically connected with the signal output part of strain detection testing device
Together, to sleeve pipe and be connected to formula pipe nipple apply identical axial tensile loads simulated test is carried out outside well, pass through strain
Test device measures the outside of sleeve of simulated test and the strain data being connected on the outside of formula pipe nipple, then, by the set of simulated test
The outside of sleeve of simulated test is separately converted to the strain data being connected on the outside of formula pipe nipple and be connected on the outside of formula pipe nipple on the outside of pipe
Load data, then, by axial tensile loads and the load data being connected on the outside of formula pipe nipple of simulated test by data point
After analysis, the coefficient correlation A between axial tensile loads and the load data being connected on the outside of formula pipe nipple of simulated test is obtained, it is related
Coefficient A is obtained according to mathematical modeling expression formula y=Ax, meanwhile, by the outside of sleeve of simulated test and the load being connected on the outside of formula pipe nipple
Lotus data obtain the load that is connected on the outside of formula pipe nipple of simulated test and the outside of sleeve of simulated test after data analysis
Coefficient correlation B between load data, coefficient correlation B are obtained according to mathematical modeling expression formula m=Bx, wherein：Y is axial tension
Load data, x is the load data being connected on the outside of formula pipe nipple of simulated test, and m is the charge number of the outside of sleeve of simulated test
According to the ＜ B ＜ 10 of 0 ＜ A ＜ 10,0；3rd step, with coefficient correlation A being connected on the outside of formula pipe nipple to the underground that obtains in the first step
Strain data be corrected after obtain the correction strain data being connected on the outside of formula pipe nipple of underground, then, with being connected to for underground
Correction strain data on the outside of formula pipe nipple is correction basic point data, with correction basic point data and coefficient correlation B in the first step
The strain data of the outside of sleeve of the underground of acquisition obtains the correction strain data of the outside of sleeve of underground after being corrected, most
Afterwards, the correction strain data of the outside of sleeve of underground is converted into the correction load data of the outside of sleeve of underground.
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, the expression formula of Hooke's law for σ=
Е × ε, wherein：σ is load value, and ε is strain value, and Е is modulus of elasticity, and Е is constant.
Above-mentioned optical fiber can be two, optical fiber with another optical fiber is spaced apart ninety degrees from is distributed in sleeve pipe and is connected to formula pipe nipple
On, the two ends of each optical fiber on same cross section are axisymmetricly distributed, and the lead angle of spiral optical fiber is
45 degree.
The above-mentioned formula pipe nipple that is connected to can be to be connected to formula detection pipe nipple, and optical fiber corresponding with being connected to formula detection pipe nipple passes through consolidating agent
It is fixedly mounted on the axial direction detection optical cable embedment groove for being connected to formula detection pipe nipple；Or, formula pipe nipple is connected to be connected to formula test nipple joint,
One section of optical fiber is fixedly mounted in the shape of a spiral to be connected on formula test nipple joint.
The above-mentioned formula pipe nipple that is connected to can be to be connected to formula detection pipe nipple and be connected to formula test nipple joint, at least one pair of adjacent sleeve pipe
Between be installed with and be connected to formula detection pipe nipple, be fixedly mounted on connection with being connected to the corresponding optical fiber of formula detection pipe nipple by consolidating agent
Enter and be fixedly mounted between the axial direction detection optical cable embedment groove of formula detection pipe nipple, at least one pair of adjacent sleeve pipe in remaining sleeve pipe
It is connected to formula test nipple joint, one section of optical fiber is fixedly mounted on is connected on formula test nipple joint in the shape of a spiral.
The above-mentioned formula test nipple joint that is connected to may include nipple body, have through hole on the inside of nipple body, in nipple body
There is outer lug boss on the outside of middle part, about at least four are intervally distributed with outer lug boss and is communicated and the embedment of spiral optical fiber is logical
Groove, optical fiber is fixedly mounted on optical fiber by consolidating agent and is embedded in groove, has external screw thread or interior in the upper and lower part of nipple body
Screw thread.
The lead angle of above-mentioned each optical fiber embedment groove can be 45 degree, the import of each optical fiber embedment groove upper end
Outlet with its lower end is corresponding up and down；Or/and, it is spaced apart ninety degrees from above-mentioned outer lug boss that four optical fiber embedment grooves are distributed with；Or/
With the cross section of, optical fiber embedment groove in opening towards the U-shaped of outside；Or/and, the top of outer lug boss is in up-narrow and down-wide frustum
Shape, the bottom of outer lug boss is in taper type wide at the top and narrow at the bottom；Or/and, internal thread is arranged at the top of nipple body, under nipple body
There is external screw thread in portion, is threadably secured and is installed together positioned at the sleeve pipe on nipple body top and the top of nipple body, is located at
The sleeve pipe of nipple body bottom and the bottom of nipple body are threadably secured and are installed together.
In the present invention, being connected to the setting of formula pipe nipple can be isolated cement sheath with optical fiber, be obtained by simulated test
Sleeve pipe real load and the coefficient correlation A being connected between the load of formula pipe nipple and it is connected to the load of formula pipe nipple and the load of sleeve pipe
Between coefficient correlation B, the underground measured is connected to after the strain data of formula pipe nipple is corrected using coefficient correlation A and obtains school
Positive group point data, then, after the strain data of the down-hole casing with correction basic point data and coefficient correlation B to measuring is corrected
Obtain correcting strain data, thereby eliminate and be connected to the harmful effect that the introducing of formula pipe nipple is caused to strain test data, simultaneously
Eliminate cement sheath to collecting fiber to the interference that causes of strain data, improve the full well section casing string strain that detection is obtained
The measuring accuracy of data.
Brief description of the drawings
Accompanying drawing 1 is the main view cross section structure diagram of each part in the present invention.
Accompanying drawing 2 is is connected to the main view half section structural representation of formula test nipple joint in the present invention.
Accompanying drawing 3 be accompanying drawing 2 in laying optical fiber after A-A to cross section structure diagram.
Coding in accompanying drawing is respectively：1 is is connected to formula pipe nipple, and 2 be sleeve pipe, and 3 be optical fiber, and 4 be strain detection testing device, and 5 are
Nipple body, 6 be through hole, and 7 be outer lug boss, and 8 be that optical fiber is embedded to groove, and 9 be cement sheath.
Embodiment
The present invention is not limited by following embodiments, can technique according to the invention scheme and actual conditions it is specific to determine
Embodiment.
In invention, for the ease of description, the description of the relative position relation of each part is according to saying in embodiment
The Butut mode of bright book accompanying drawing 1 is described, such as：The position relationship of upper and lower, left and right etc. is according to Figure of description
Butut direction is determined.
With reference to embodiment, the invention will be further described：
Embodiment 1：As shown in accompanying drawing 1 to 3, the online stress mornitoring data precision of raising down-hole casing post distribution type fiber-optic
Method carry out in the steps below：The first step, is fixedly mounted between at least one pair of adjacent sleeve pipe 2 and is connected to formula pipe nipple 1, remaining
Adjacent sleeve pipe 2 is fixedly installed togather, and it is U-shaped and axially right that at least two difference are fixedly mounted in the outside spacers of sleeve pipe 2
The optical fiber 3 of title, one section of optical fiber 3 is fixedly mounted on sleeve pipe 2 in the shape of a spiral, and signal output part and the strain testing of optical fiber 3 are filled
The signal input part for putting 4 is electrically connected, and the signal output part of the signal input part and strain detection testing device 4 of optical fiber 3 is electrically connected
It is connected together, sleeve pipe 2 and the G.I.H together of formula pipe nipple 1 will be connected to, be measured by strain detection testing device 4 outside the sleeve pipe 2 of underground
Side and the strain data for being connected to the outside of formula pipe nipple 1；Second step, is fixedly mounted between at least one pair of adjacent sleeve pipe 2 and is connected to formula
Pipe nipple 1, remaining adjacent sleeve pipe 2 is fixedly installed togather, and it is in U respectively to be fixedly mounted at least two in the outside spacers of sleeve pipe 2
Type and axially symmetric optical fiber 3, one section of optical fiber 3 are fixedly mounted on sleeve pipe 2 in the shape of a spiral, the signal output part of optical fiber 3 with
The signal input part of strain detection testing device 4 is electrically connected, the signal input part of optical fiber 3 and the signal of strain detection testing device 4
Output end is electrically connected, to sleeve pipe 2 and be connected to formula pipe nipple 1 apply identical axial tensile loads simulated outside well
Experiment, measures the outside of sleeve pipe 2 of simulated test by strain detection testing device 4 and is connected to the strain data in the outside of formula pipe nipple 1, so
Afterwards, the outside of sleeve pipe 2 of simulated test and the strain data being connected on the outside of formula pipe nipple 1 are separately converted to the sleeve pipe 2 of simulated test
Outside and the load data for being connected to the outside of formula pipe nipple 1, then, by being connected to outside formula pipe nipple 1 for axial tensile loads and simulated test
The load data of side obtains the load for being connected to the outside of formula pipe nipple 1 of axial tensile loads and simulated test after data analysis
Coefficient correlation A between data, coefficient correlation A are obtained according to mathematical modeling expression formula y=Ax, meanwhile, by the sleeve pipe of simulated test
2 outsides and the load data for being connected to the outside of formula pipe nipple 1 are after data analysis, and obtain simulated test is connected to the outside of formula pipe nipple 1
Load and simulated test the outside of sleeve pipe 2 load data between coefficient correlation B, coefficient correlation B is according to mathematical modeling table
Obtained up to formula m=Bx, wherein：Y is axial tensile loads data, and x is the load data being connected on the outside of formula pipe nipple of simulated test, m
For the load data of the outside of sleeve of simulated test, the ＜ B ＜ 10 of 0 ＜ A ＜ 10,0；3rd step, with coefficient correlation A in the first step
What being connected to of the underground of middle acquisition obtained underground after the strain data in the outside of formula pipe nipple 1 is corrected is connected to the outside of formula pipe nipple 1
Strain data is corrected, then, using the correction strain data for being connected to the outside of formula pipe nipple 1 of underground as correction basic point data, with correction
Basic point data and coefficient correlation B are obtained after being corrected to the strain data in the outside of sleeve pipe 2 of the underground obtained in the first step
The correction strain data in the outside of sleeve pipe 2 of underground, finally, underground is converted into by the correction strain data in the outside of sleeve pipe 2 of underground
The outside of sleeve pipe 2 correction load data.Sleeve pipe real load is obtained by simulated test（Axial tensile loads）With being connected to formula
Coefficient correlation A between the load of the pipe nipple 1 and coefficient correlation B being connected between the load of the load of formula pipe nipple 1 and sleeve pipe 2,
The underground measured is connected to using coefficient correlation A after the strain data of formula pipe nipple 1 is corrected and obtains correcting basic point data, so
Afterwards, the strain data of the down-hole casing 2 with correction basic point data and coefficient correlation B to measuring obtains correction strain after being corrected
Data, thereby eliminate and are connected to the harmful effect that the introducing of formula pipe nipple 1 is caused to strain test data, while eliminating cement sheath
The interference that the strain data that 9 pairs of optical fiber 3 are collected is caused, improves the test for the full well section casing string strain data that detection is obtained
Precision；Strain detection testing device 4 is existing known technology.
Embodiment 2：As needed, as the optimization of above-described embodiment, strain data turns according to the expression formula of Hooke's law
Load data is turned to, the expression formula of Hooke's law is σ=Е × ε, wherein：σ is load value, and ε is strain value, and Е is modulus of elasticity,
And Е is constant；Or/and, the data analysis mode in second step is that Linear correlative analysis or/and nonlinear correlation are analyzed.
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 with it is another
A piece optical fiber 3 is spaced apart ninety degrees to be distributed in sleeve pipe 2 and is connected on formula pipe nipple 1, each optical fiber 3 on same cross section
Two ends are axisymmetricly distributed, 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, it is short to be connected to formula detection to be connected to formula pipe nipple 1
Section, optical fiber 3 corresponding with being connected to formula detection pipe nipple is fixedly mounted on the axial detection light that the formula that is connected to detects pipe nipple by consolidating agent
Cable is embedded to groove；Or, it is connected to formula pipe nipple 1 to be connected to formula test nipple joint, one section of optical fiber 3 is fixedly mounted on the formula of being connected in the shape of a spiral
On test nipple joint.Being connected to formula detection pipe nipple or being connected to the selection of formula test nipple joint needs and enters according to the test of deformation type data
Row selection, when needing only to investigate axial strain, is connected to formula pipe nipple 1 to be connected to formula detection pipe nipple；Axially should when needing to investigate
When change or radial strain, it is connected to formula pipe nipple 1 to be connected to formula test nipple joint；When needing to investigate axial strain and radial strain, connection
Enter formula pipe nipple 1 to be connected to formula test nipple joint；It is connected to formula detection pipe nipple and uses notification number for the U of CN 203223216 Chinese patent
Technology in document.Consolidating agent is eliminated using the method for introducing correction basic point strain data to cause not strain test data
Good influence.
Embodiment 5：As shown in accompanying drawing 1 to 3, as the optimization of above-described embodiment, it is short to be connected to formula detection to be connected to formula pipe nipple 1
Formula test nipple joint is saved and be connected to, is installed between at least one pair of adjacent sleeve pipe 2 and is connected to formula detection pipe nipple, with being connected to formula
The corresponding optical fiber 3 of detection pipe nipple is fixedly mounted on the axial direction detection optical cable embedment groove for being connected to formula detection pipe nipple by consolidating agent,
It is installed between at least one pair of adjacent sleeve pipe 2 in remaining sleeve pipe 2 and is connected to formula test nipple joint, one section of optical fiber 3 is in spiral shell
Rotation shape, which is fixedly mounted on, to be connected on formula test nipple joint.It is connected to formula detection pipe nipple and is connected to being applied in combination according to reality of formula test nipple joint
Depending on border needs.
Embodiment 6：As shown in accompanying drawing 1 to 3, it is that the formula test nipple joint of being connected to includes with the difference of above-described embodiment
Nipple body 5, has through hole 6 in the inner side of nipple body 5, there is outer lug boss 7 on the outside of the middle part of nipple body 5, in outer lug boss 7
It is intervally distributed with about at least four to communicate and spiral optical fiber embedment groove 8, optical fiber 3 is fixedly mounted on by consolidating agent
In optical fiber embedment groove 8, there are external screw thread or internal thread in the upper and lower part of nipple body 5.Optical fiber is embedded to the setting energy of groove 8
It is enough to be isolated cement sheath 9 with detection fiber, it is to avoid it is dry that cement sheath 9 is caused to the strain data that detection fiber is collected
Disturb.
Embodiment 7：As shown in accompanying drawing 1 to 3, it is with the difference of above-described embodiment, each optical fiber embedment groove 8
Lead angle is 45 degree, and the import and the outlet of its lower end of each optical fiber embedment groove 8 upper end are corresponding up and down；Or/and, outside
It is spaced apart ninety degrees from boss 7 that four optical fiber embedment grooves 8 are distributed with；Or/and, the cross section of optical fiber embedment groove 8 is in opening court
Laterally U-shaped；Or/and, the top of outer lug boss 7 is in up-narrow and down-wide taper type, and the bottom of outer lug boss 7 is in cone wide at the top and narrow at the bottom
Platform shape；Or/and, internal thread is arranged at the top of nipple body 5, has external screw thread in the bottom of nipple body 5, in nipple body 5
The sleeve pipe 2 in portion and the top of nipple body 5 are threadably secured and are installed together, positioned at the bottom of nipple body 5 sleeve pipe 2 with it is short
The bottom of abridged edition body 5, which is threadably secured, to be installed together.The import and the outlet of its lower end of each optical fiber embedment groove 8 upper end
Corresponding setting ensure that the laying orientation of the test optical fiber on the two section sleeve pipes 2 adjacent with being connected to formula test nipple joint up and down
Uniformity, further increases the measuring accuracy for the casing string strain data that detection is obtained.
Above technical characteristic constitutes embodiments of the invention, and it has stronger adaptability and implementation result, can basis
The non-essential technical characteristic of increase and decrease is actually needed, to meet the demand of different situations.
Claims (15)
1. a kind of method for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic, it is characterised in that by following
Step is carried out：The first step, is fixedly mounted between at least one pair of adjacent sleeve pipe and is connected to formula pipe nipple, remaining adjacent sleeve pipe is fixed
It is installed together, the U-shaped and axially symmetric optical fiber of at least two difference, the one of optical fiber is fixedly mounted in the outside spacers of sleeve pipe
Section is fixedly mounted on sleeve pipe in the shape of a spiral, and the signal output part of optical fiber and the signal input part of strain detection testing device are connected electrically in
Together, the signal input part of optical fiber and the signal output part of strain detection testing device are electrically connected, by sleeve pipe and to be connected to formula short
G.I.H together is saved, the outside of sleeve of underground and the strain data being connected on the outside of formula pipe nipple are measured by strain detection testing device；
Second step, is fixedly mounted between at least one pair of adjacent sleeve pipe and is connected to formula pipe nipple, remaining adjacent sleeve pipe is fixedly mounted on one
Rise, the U-shaped and axially symmetric optical fiber of at least two difference is fixedly mounted in the outside spacers of sleeve pipe, one section of optical fiber is helically
Shape is fixedly mounted on sleeve pipe, and the signal output part of optical fiber and the signal input part of strain detection testing device are electrically connected, light
Fine signal input part and the signal output part of strain detection testing device are electrically connected, and to sleeve pipe and are connected to formula pipe nipple and apply
Identical axial tensile loads carry out simulated test outside well, by strain detection testing device measure simulated test outside of sleeve and
The strain data on the outside of formula pipe nipple is connected to, then, by the outside of sleeve of simulated test and the strain data being connected on the outside of formula pipe nipple
Be separately converted to the outside of sleeve of simulated test and the load data being connected on the outside of formula pipe nipple, then, by axial tensile loads with
The load data being connected on the outside of formula pipe nipple of simulated test obtains axial tensile loads and simulated test after data analysis
The coefficient correlation A between the load data on the outside of formula pipe nipple is connected to, coefficient correlation A is obtained according to mathematical modeling expression formula y=Ax,
Meanwhile, by the outside of sleeve of simulated test and the load data being connected on the outside of formula pipe nipple after data analysis, obtain simulation examination
Coefficient correlation B between the load being connected on the outside of formula pipe nipple and the load data of the outside of sleeve of simulated test tested, phase relation
Number B is obtained according to mathematical modeling expression formula m=Bx, wherein：Y is axial tensile loads data, x for simulated test to be connected to formula short
Load data on the outside of section, m is the load data of the outside of sleeve of simulated test, the ＜ B ＜ 10 of 0 ＜ A ＜ 10,0；3rd step, is used
The strain data being connected on the outside of formula pipe nipple of undergrounds of the coefficient correlation A to obtaining in the first step obtains underground after being corrected
The correction strain data on the outside of formula pipe nipple is connected to, then, using the correction strain data being connected on the outside of formula pipe nipple of underground as correction
Basic point data, with correction basic point data and coefficient correlation B to the strain data of the outside of sleeve of underground obtained in the first step
The correction strain data of the outside of sleeve of underground is obtained after being corrected, finally, by the correction dependent variable of the outside of sleeve of underground
According to the correction load data for the outside of sleeve for being converted into underground.
2. the method according to claim 1 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
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 for σ=Е ×
ε, wherein：σ is load value, and ε is strain value, and Е is modulus of elasticity, and Е is constant.
3. the side according to claim 1 or 2 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic
Method, it is characterised in that optical fiber is two, optical fiber with another optical fiber is spaced apart ninety degrees from is distributed in sleeve pipe and is connected to formula pipe nipple
On, the two ends of each optical fiber on same cross section are axisymmetricly distributed, and the lead angle of spiral optical fiber is
45 degree.
4. the side according to claim 1 or 2 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic
Method, it is characterised in that be connected to formula pipe nipple to be connected to formula detection pipe nipple, optical fiber corresponding with being connected to formula detection pipe nipple passes through consolidating agent
It is fixedly mounted on the axial direction detection optical cable embedment groove for being connected to formula detection pipe nipple；Or, formula pipe nipple is connected to be connected to formula test nipple joint,
One section of optical fiber is fixedly mounted in the shape of a spiral to be connected on formula test nipple joint.
5. the method according to claim 3 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that being connected to formula pipe nipple to be connected to formula detection pipe nipple, optical fiber corresponding with being connected to formula detection pipe nipple is fixed by consolidating agent
Installed in the axial direction detection optical cable embedment groove for being connected to formula detection pipe nipple；Or, formula pipe nipple is connected to be connected to formula test nipple joint, optical fiber
One section be fixedly mounted on be connected on formula test nipple joint in the shape of a spiral.
6. the side according to claim 1 or 2 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic
Method, it is characterised in that be connected to formula pipe nipple to be connected to formula detection pipe nipple and being connected to formula test nipple joint, at least one pair of adjacent sleeve pipe
Between be installed with and be connected to formula detection pipe nipple, be fixedly mounted on connection with being connected to the corresponding optical fiber of formula detection pipe nipple by consolidating agent
Enter and be fixedly mounted between the axial direction detection optical cable embedment groove of formula detection pipe nipple, at least one pair of adjacent sleeve pipe in remaining sleeve pipe
It is connected to formula test nipple joint, one section of optical fiber is fixedly mounted on is connected on formula test nipple joint in the shape of a spiral.
7. the method according to claim 3 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that being connected to formula pipe nipple to be connected to formula detection pipe nipple and being connected to formula test nipple joint, between at least one pair of adjacent sleeve pipe
It is installed with and is connected to formula detection pipe nipple, optical fiber corresponding with being connected to formula detection pipe nipple is fixedly mounted on the formula of being connected to by consolidating agent
Detect and be installed with connection between the axial direction detection optical cable embedment groove of pipe nipple, at least one pair of adjacent sleeve pipe in remaining sleeve pipe
Enter formula test nipple joint, one section of optical fiber is fixedly mounted on is connected on formula test nipple joint in the shape of a spiral.
8. the method according to claim 4 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that being connected to formula test nipple joint includes nipple body, there is through hole on the inside of nipple body, at the middle part of nipple body
There is outer lug boss in outside, and about at least four are intervally distributed with outer lug boss and is communicated and spiral optical fiber embedment groove, light
It is fine to be fixedly mounted on by consolidating agent in optical fiber embedment groove, there are external screw thread or internal thread in the upper and lower part of nipple body.
9. the method according to claim 5 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that being connected to formula test nipple joint includes nipple body, there is through hole on the inside of nipple body, at the middle part of nipple body
There is outer lug boss in outside, and about at least four are intervally distributed with outer lug boss and is communicated and spiral optical fiber embedment groove, light
It is fine to be fixedly mounted on by consolidating agent in optical fiber embedment groove, there are external screw thread or internal thread in the upper and lower part of nipple body.
10. the method according to claim 6 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that being connected to formula test nipple joint includes nipple body, there is through hole on the inside of nipple body, at the middle part of nipple body
There is outer lug boss in outside, and about at least four are intervally distributed with outer lug boss and is communicated and spiral optical fiber embedment groove, light
It is fine to be fixedly mounted on by consolidating agent in optical fiber embedment groove, there are external screw thread or internal thread in the upper and lower part of nipple body.
11. the method according to claim 7 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that being connected to formula test nipple joint includes nipple body, there is through hole on the inside of nipple body, at the middle part of nipple body
There is outer lug boss in outside, and about at least four are intervally distributed with outer lug boss and is communicated and spiral optical fiber embedment groove, light
It is fine to be fixedly mounted on by consolidating agent in optical fiber embedment groove, there are external screw thread or internal thread in the upper and lower part of nipple body.
12. the method according to claim 8 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that the lead angle of each optical fiber embedment groove is 45 degree, each optical fiber be embedded to groove upper end import and its
The outlet of lower end is corresponded to up and down；Or/and, it is spaced apart ninety degrees from outer lug boss that four optical fiber embedment grooves are distributed with；Or/and, optical fiber
The cross section of groove is embedded in opening towards the U-shaped of outside；Or/and, the top of outer lug boss is in up-narrow and down-wide taper type, evagination
The bottom of platform is in taper type wide at the top and narrow at the bottom；Or/and, internal thread is arranged at the top of nipple body, there is outer in the bottom of nipple body
Screw thread, is threadably secured and is installed together positioned at the sleeve pipe on nipple body top and the top of nipple body, positioned at pipe nipple sheet
The sleeve pipe of body bottom and the bottom of nipple body are threadably secured and are installed together.
13. the method according to claim 9 for improving the online stress mornitoring data precision of down-hole casing post distribution type fiber-optic,
It is characterized in that the lead angle of each optical fiber embedment groove is 45 degree, each optical fiber be embedded to groove upper end import and its
The outlet of lower end is corresponded to up and down；Or/and, it is spaced apart ninety degrees from outer lug boss that four optical fiber embedment grooves are distributed with；Or/and, optical fiber
The cross section of groove is embedded in opening towards the U-shaped of outside；Or/and, the top of outer lug boss is in up-narrow and down-wide taper type, evagination
The bottom of platform is in taper type wide at the top and narrow at the bottom；Or/and, internal thread is arranged at the top of nipple body, there is outer in the bottom of nipple body
Screw thread, is threadably secured and is installed together positioned at the sleeve pipe on nipple body top and the top of nipple body, positioned at pipe nipple sheet
The sleeve pipe of body bottom and the bottom of nipple body are threadably secured and are installed together.
14. the side of the raising online stress mornitoring data precision of down-hole casing post distribution type fiber-optic according to claim 10
Method, it is characterised in that the lead angle of each optical fiber embedment groove is 45 degree, the import of each optical fiber embedment groove upper end
Outlet with its lower end is corresponding up and down；Or/and, it is spaced apart ninety degrees from outer lug boss that four optical fiber embedment grooves are distributed with；Or/and,
The cross section of optical fiber embedment groove is in opening towards the U-shaped of outside；Or/and, the top of outer lug boss is in up-narrow and down-wide taper type,
The bottom of outer lug boss is in taper type wide at the top and narrow at the bottom；Or/and, internal thread is arranged at the top of nipple body, in the bottom of nipple body
There is external screw thread, be threadably secured and be installed together positioned at the sleeve pipe on nipple body top and the top of nipple body, positioned at short
Save the sleeve pipe of body lower part and the bottom of nipple body is threadably secured and is installed together.
15. the side of the raising online stress mornitoring data precision of down-hole casing post distribution type fiber-optic according to claim 11
Method, it is characterised in that the lead angle of each optical fiber embedment groove is 45 degree, the import of each optical fiber embedment groove upper end
Outlet with its lower end is corresponding up and down；Or/and, it is spaced apart ninety degrees from outer lug boss that four optical fiber embedment grooves are distributed with；Or/and,
The cross section of optical fiber embedment groove is in opening towards the U-shaped of outside；Or/and, the top of outer lug boss is in up-narrow and down-wide taper type,
The bottom of outer lug boss is in taper type wide at the top and narrow at the bottom；Or/and, internal thread is arranged at the top of nipple body, in the bottom of nipple body
There is external screw thread, be threadably secured and be installed together positioned at the sleeve pipe on nipple body top and the top of nipple body, positioned at short
Save the sleeve pipe of body lower part and the bottom of nipple body is threadably secured and is installed together.
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| CN112814646B (en) * | 2019-10-31 | 2023-09-05 | 中国石油化工股份有限公司 | Oil-water well pipe external fluid channeling distributed optical fiber detection simulation device and application method thereof |
| CN111707204B (en) * | 2020-04-27 | 2021-12-28 | 中船重工(大连)海防环保科技有限公司 | Sleeve strain monitoring method and device based on spirally-laid optical fibers |
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| US6840114B2 (en) * | 2003-05-19 | 2005-01-11 | Weatherford/Lamb, Inc. | Housing on the exterior of a well casing for optical fiber sensors |
| GB2454220B (en) * | 2007-11-01 | 2012-05-23 | Schlumberger Holdings | Apparatus and methods for detecting strain in structures |
| JP5619571B2 (en) * | 2010-11-05 | 2014-11-05 | 三菱重工業株式会社 | Response distribution measurement system for riser and riser tubes |
| US9103736B2 (en) * | 2010-12-03 | 2015-08-11 | Baker Hughes Incorporated | Modeling an interpretation of real time compaction modeling data from multi-section monitoring system |
| CN202659225U (en) * | 2012-06-08 | 2013-01-09 | 中国石油天然气集团公司 | Linked type stress test short joint |
| CN103061746B (en) * | 2013-01-08 | 2015-10-28 | 中国石油天然气集团公司 | The omnidistance online stress detection device of the distributed optical cable of Oil/gas Well down-hole casing string |
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