CN102061911A - Method for measuring wall thickness of downhole casing - Google Patents
Method for measuring wall thickness of downhole casing Download PDFInfo
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- CN102061911A CN102061911A CN2010105851755A CN201010585175A CN102061911A CN 102061911 A CN102061911 A CN 102061911A CN 2010105851755 A CN2010105851755 A CN 2010105851755A CN 201010585175 A CN201010585175 A CN 201010585175A CN 102061911 A CN102061911 A CN 102061911A
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- wall thickness
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- casing
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Abstract
The invention discloses a method for measuring the wall thickness of a downhole casing, comprising the following steps of: eliminating the influence of stratum density and cement sheath density on the calculated value of the wall thickness of the downhole casing according to a counting rate curve of a distance detector; and establishing a calculation formula of the wall thickness of the downhole casing to figure out the wall thickness of the downhole casing by utilizing a regression method. The calculation is carried out by adopting the counting rate of the distance detector and the influence of a stratum and a cement sheath on the counting rate of the distance detector when the stratum density and the cement sheath density are different is eliminated, thereby the calculation accuracy of the wall thickness of the downhole casing is improved.
Description
Technical field
The present invention relates to the measuring method of the sleeve pipe in a kind of oil field, relate in particular to a kind of down-hole casing wall thickness measuring method, be applicable to the damage evaluation of down-hole casing.
Background technology
The measuring method of present gamma density casing wall thickness, only utilized nearly Detector count rate value to calculate, do not utilize far detector counting rate value, and do not consider of the influence of the density difference of density of earth formations, cement sheath to probe gamma photons counting rate yet, casing wall thickness that is calculated and the actual bigger difference of casing wall thickness existence have influenced next step construction decision-making.The main cause that produces the problems referred to above is: 1. existing computational methods are only calculated with nearly Detector count rate value; 2. do not consider density of earth formations not simultaneously the stratum to the scattering and the absorption of gamma photons; 3. do not consider cement sheath density not simultaneously, cement sheath is to the scattering and the absorption of gamma photons.
China Patent No. " 20,062,009,388 1.7 " discloses a kind of gamma density thickness logging tool graduation apparatus, the applying date is on October 28th, 2006, notice of authorization day is on October 17th, 2007, it is made up of casing coupling, upper steel plate, inner sleeve outer sleeve, reinforcing bar, lower steel plate and G level cementing concrete, be provided with the different inner sleeve combination of the identical wall thickness of length in the outer sleeve, fixed between the internal and external casing wall with G level cementing concrete; Inside and outside sleeve pipe upper and lower is welded with upper steel plate and lower steel plate respectively, along the circumferential uniform root reinforcing bar that is welded with upper and lower steel plate is held between the upper and lower steel plate in the outer sleeve outside, and the inner sleeve upper end is connected with casing coupling.In addition, Fang Zhou etc. has proposed " CALCULATION OF WALL THICKNESS OF EXPANDABLE CASING " in " drilling engineering " in May, 2006 " gas industry ".Aforesaid patented technology only is used for sleeve pipe outer having or not with composition of cementing ring and detects, and determines well cementation completion quality height with this." CALCULATION OF WALL THICKNESS OF EXPANDABLE CASING " described later only is suitable for measuring the wall thickness of expansion tube.
Summary of the invention
The objective of the invention is to overcome the problems referred to above of the measuring method existence that has gamma density casing wall thickness now, a kind of down-hole casing wall thickness measuring method is provided, the present invention adopts far and near Detector count rate to calculate, and eliminated since density of earth formations and cement sheath density stratum and cement sheath have not improved the calculating accuracy of down-hole casing wall thickness to the influence of Detector count rate simultaneously.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of down-hole casing wall thickness measuring method, it is characterized in that: according to the counting rate curve of far and near probe, eliminate density of earth formations and cement sheath density to the influence of casing wall thickness calculated value, utilize homing method, set up the casing wall thickness design formulas and calculate casing wall thickness.
The method for building up of described casing wall thickness design formulas is according to nearly Detector count rate TL, far detector counting rate PL, to utilize homing method to set up design formulas:
TH=TH
ST
?-?K*LN(TL/TL
ST
)+LN(PL/PL
ST
)+△TH
In the following formula, TH is the calculated wall thickness value, TH
STBe the normal sleeve wall thickness value, K is a calibration factor, and TL is nearly Detector count rate value, TL
STBe standard value well section average counter rate value, PL is a far detector counting rate value, PL
STBe standard value well section average counter rate value,
△ THThe correcting value when casing wall thickness calculates for density of earth formations and cement sheath density.
The difference △ TH of described density of earth formations and standardization of casing value and casing wall thickness calculated value is the One-place 2-th Order relation, and the difference △ TH of cement slurry density and standardization of casing value and casing wall thickness calculated value is that monobasic once concerns, utilizes homing method, obtains the expression formula of △ TH:
△ TH=(0.75 ρ
2
The stratum
+ 5.24 ρ
The stratum
-1.54 ρ
Cement paste
)-8
Wherein, TH
STBe the normal sleeve wall thickness value,
ρ The stratum Be density of earth formations,
ρ Cement paste Be cement slurry density.
Describedly utilize density of earth formations not simultaneously, the relation of the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value, the pass that draws the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value is the One-place 2-th Order relational expression.
Describedly utilize cement sheath density not simultaneously, the relation of the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value, the pass that draws the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value is relational expression of monobasic.
Employing the invention has the advantages that:
One, the present invention has utilized far and near explorer count rate curve to calculate, and has improved the accuracy of casing wall thickness calculated value.
Two, because the density of earth formations difference, the stratum is also different to the ability of the scattering of gamma photons and absorption, far and near Detector count rate is also just different, the present invention has considered the influence of density of earth formations, eliminated because of not layer influence over the ground simultaneously of density of earth formations, improved the accuracy of casing wall thickness calculated value Detector count rate.
Three, because cement sheath density has influence to far and near probe, the present invention has considered that the cement sheath of different cement sheath density is to gamma photons scattering and absorption, eliminated because of cement sheath density not simultaneously cement sheath to the influence of Detector count rate, improved the accuracy of casing wall thickness calculated value, the present invention can accurately measure the down-hole casing wall thickness, and can realize under different interpretation platforms.
Description of drawings
Fig. 1 is the graph of a relation of the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value
Fig. 2 is the graph of a relation of the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value.
The specific embodiment
A kind of down-hole casing wall thickness measuring method according to the counting rate curve of far and near probe, is eliminated density of earth formations and cement sheath density to the influence of casing wall thickness calculated value, utilizes homing method, sets up the casing wall thickness design formulas and calculates casing wall thickness.
Detailed process is as follows:
1. according to nearly Detector count rate (TL), far detector counting rate (PL), utilize homing method to set up and calculate the casing wall thickness method:
TH=TH
ST
?-?K*LN(TL/TL
ST
)+LN(PL/PL
ST
)+△TH
In the following formula, TH is the calculated wall thickness value, TH
STBe the normal sleeve wall thickness value, K is a calibration factor, and TL is nearly Detector count rate value, TL
STBe standard value well section average counter rate value, PL is a far detector counting rate value, PL
STBe standard value well section average counter rate value,
△ TH
The correcting value when casing wall thickness calculates for density of earth formations and cement sheath density.
2. utilize density of earth formations not simultaneously, the relation of the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value, the pass that draws the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value is the One-place 2-th Order relational expression.
3. utilize cement sheath density not simultaneously, the relation of the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value, the pass that draws the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value is relational expression of monobasic.
By the difference △ TH of above density of earth formations and standardization of casing value and casing wall thickness calculated value is the One-place 2-th Order relation, cement slurry density and standardization of casing value and casing wall thickness calculated value poor
△ TH is that monobasic once concerns, utilizes homing method, obtains the expression formula of △ TH:
△ TH=(0.75 ρ
2
The stratum
+ 5.24 ρ
The stratum
-1.54 ρ
Cement paste
)-8
In the following formula, TH
STBe the normal sleeve wall thickness value,
ρ The stratum Be density of earth formations,
ρ Cement paste Be cement slurry density.
Claims (5)
1. down-hole casing wall thickness measuring method, it is characterized in that: according to the counting rate curve of far and near probe, eliminate density of earth formations and cement sheath density to the influence of casing wall thickness calculated value, utilize homing method, set up the casing wall thickness design formulas and calculate casing wall thickness.
2. down-hole casing wall thickness measuring method according to claim 1 is characterized in that: the method for building up of described casing wall thickness design formulas is according to nearly Detector count rate TL, far detector counting rate PL, to utilize homing method to set up design formulas:
TH=TH
ST
?-?K*LN(TL/TL
ST
)+LN(PL/PL
ST
)+△TH
In the following formula, TH is the calculated wall thickness value, TH
STBe the normal sleeve wall thickness value, K is a calibration factor, and TL is nearly Detector count rate value, TL
STBe standard value well section average counter rate value, PL is a far detector counting rate value, PL
STBe standard value well section average counter rate value,
△ THThe correcting value when casing wall thickness calculates for density of earth formations and cement sheath density.
3. down-hole casing wall thickness measuring method according to claim 2, it is characterized in that: the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value is the One-place 2-th Order relation, the difference △ TH of cement slurry density and standardization of casing value and casing wall thickness calculated value is that monobasic once concerns, utilize homing method, obtain the expression formula of △ TH:
△ TH=(0.75 ρ
2
The stratum
+ 5.24 ρ
The stratum
-1.54 ρ
Cement paste
)-8
Wherein, TH
STBe the normal sleeve wall thickness value,
ρ The stratum Be density of earth formations,
ρ Cement paste Be cement slurry density.
4. down-hole casing wall thickness measuring method according to claim 3, it is characterized in that: utilize density of earth formations not simultaneously, the relation of the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value, the pass that draws the difference △ TH of density of earth formations and standardization of casing value and casing wall thickness calculated value is the One-place 2-th Order relational expression.
5. according to claim 3 or 4 described down-hole casing wall thickness measuring methods, it is characterized in that: utilize cement sheath density not simultaneously, the relation of the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value, the pass that draws the difference △ TH of cement sheath density and standardization of casing value and casing wall thickness calculated value are relational expression of monobasic.
Priority Applications (1)
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|---|---|---|---|
| CN 201010585175 CN102061911B (en) | 2010-12-13 | 2010-12-13 | Method for measuring wall thickness of downhole casing |
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|---|---|---|---|
| CN 201010585175 CN102061911B (en) | 2010-12-13 | 2010-12-13 | Method for measuring wall thickness of downhole casing |
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| CN102061911B CN102061911B (en) | 2013-06-26 |
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|---|---|---|---|
| CN 201010585175 Expired - Fee Related CN102061911B (en) | 2010-12-13 | 2010-12-13 | Method for measuring wall thickness of downhole casing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761667A (en) * | 2016-11-09 | 2017-05-31 | 中国石油大学(北京) | A kind of four probes scattering gamma logging and the method and device of linear data inverting |
| CN106761666A (en) * | 2016-11-09 | 2017-05-31 | 中国石油大学(北京) | A kind of four probes scattering gamma logging and the method and device of nonlinear data inverting |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715442A (en) * | 1984-04-11 | 1987-12-29 | Pa Incorporated | Apparatus for servicing tubular strings in subterranean wells |
| RU1789662C (en) * | 1990-02-28 | 1993-01-23 | Западно-Сибирский Научно-Исследовательский И Проектно-Конструкторский Институт Технологии Глубокого И Разведочного Бурения | Method for placing cement bridging plugs in wells with lost circulation |
| CN2737943Y (en) * | 2004-10-26 | 2005-11-02 | 西安市首创科技工程有限公司 | Detector for low-energy gamma source fluid density well logging instrument |
| CN200961479Y (en) * | 2006-10-28 | 2007-10-17 | 辽河石油勘探局 | Gamma logging device graduation device for density and thickness |
| CN201071713Y (en) * | 2007-08-16 | 2008-06-11 | 西安威盛电子仪器有限公司 | Down-hole vertical poly-magnetic probe |
| CN201144688Y (en) * | 2007-10-26 | 2008-11-05 | 辽河石油勘探局 | Aggregate unit of multi-arm caliper and electromagnetic flaw detector |
| CN101737039A (en) * | 2009-12-31 | 2010-06-16 | 西安思坦仪器股份有限公司 | Multi-functional underground electromagnetic crack detector |
-
2010
- 2010-12-13 CN CN 201010585175 patent/CN102061911B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715442A (en) * | 1984-04-11 | 1987-12-29 | Pa Incorporated | Apparatus for servicing tubular strings in subterranean wells |
| RU1789662C (en) * | 1990-02-28 | 1993-01-23 | Западно-Сибирский Научно-Исследовательский И Проектно-Конструкторский Институт Технологии Глубокого И Разведочного Бурения | Method for placing cement bridging plugs in wells with lost circulation |
| CN2737943Y (en) * | 2004-10-26 | 2005-11-02 | 西安市首创科技工程有限公司 | Detector for low-energy gamma source fluid density well logging instrument |
| CN200961479Y (en) * | 2006-10-28 | 2007-10-17 | 辽河石油勘探局 | Gamma logging device graduation device for density and thickness |
| CN201071713Y (en) * | 2007-08-16 | 2008-06-11 | 西安威盛电子仪器有限公司 | Down-hole vertical poly-magnetic probe |
| CN201144688Y (en) * | 2007-10-26 | 2008-11-05 | 辽河石油勘探局 | Aggregate unit of multi-arm caliper and electromagnetic flaw detector |
| CN101737039A (en) * | 2009-12-31 | 2010-06-16 | 西安思坦仪器股份有限公司 | Multi-functional underground electromagnetic crack detector |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761667A (en) * | 2016-11-09 | 2017-05-31 | 中国石油大学(北京) | A kind of four probes scattering gamma logging and the method and device of linear data inverting |
| CN106761666A (en) * | 2016-11-09 | 2017-05-31 | 中国石油大学(北京) | A kind of four probes scattering gamma logging and the method and device of nonlinear data inverting |
| CN106761666B (en) * | 2016-11-09 | 2019-12-17 | 中国石油大学(北京) | Method and device for four-probe scattering gamma logging and nonlinear data inversion |
| CN106761667B (en) * | 2016-11-09 | 2019-12-17 | 中国石油大学(北京) | Method and device for four-probe scattering gamma logging and linear data inversion |
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| CN102061911B (en) | 2013-06-26 |
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Granted publication date: 20130626 Termination date: 20171213 |