US4636727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting the location of defects in tubular sections moving past a well head
Assignee: PA Inc
•
Filing: 1984-04-11
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Granted: 1987-01-13
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Expires: 2004-04-11
Abstract
Abstract A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects, as well as the average wall thickness of the tubular elements, are measured. The position of the defects is determined by measuring the variable velocity of the tubular elements as they are removed from the well and by detecting end couplings having a larger cross-sectional area and the direction in which the end couplings are moving. A string profile of the position of the defects in the continuous string can also be established.
Inventors
- 👤 John E. Kahil
- 👤 Marvin Milewits
- 👤 James E. Bradfield
- 👤 Clive C. Lam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:26
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/006; E21B47/00; E21B47/006; G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9013; G01N27/9026
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
186 words
A method of determining the location of defects in a tubular string, formed from a series of tubular sections interconnected by end couplings wherein the cross-sectional area at the end couplings is greater than the cross-sectional area of the tubular sections intermediate the ends thereof, used in a subterranean oil or gas well, as a function of the position of the tubular string within the well, as the tubular sections travel relative to the well head, the method comprising the steps of: determining the existence of defects on each tubular section as the tubular string travels relative to the well head; detecting the presence of an end coupling at the well head by discriminating between tubular sections intermediate the ends thereof and the end couplings of greater cross-sectional area; detecting the direction of movement of each end coupling relative to the wellhead; and determining the location of defects in the tubing string relative to an end coupling at one end of a tubular section, whereby the location of defects on the tubular string can be determined by counting the end couplings traveling past the well head.
Claim 2
Independent Claim
186 words
A method of determining the location of defects in a tubular string, formed from a series of tubular sections interconnected by end couplings wherein the cross-sectional area at the end couplings is greater than the cross-sectional area of the tubular sections intermediate the ends thereof, used in a subterranean oil or gas well, as a function of the position of the tubular string within the well, as the tubular sections travel relative to the well head, the method comprising the steps of: determining the existence of defects on each tubular section as the tubular string travels relative to the well head; detecting the presence of an end coupling at the well head by discriminating between tubular sections intermediate the ends thereof and the end couplings of greater cross-sectional area; detecting the direction of movement of each end coupling relative to the wellhead; and determining the location of defects in the tubing string relative to an end coupling at one end of a tubular section, whereby the location of defects on the tubular string can be determined by counting the end couplings traveling past the well head.
Claim 3
Independent Claim
210 words
A method of determining the location of defects in each of a series of tubular sections interconnected by end couplings having cross-sectional area at the end couplings greater than the cross-sectional area of the tubular sections intermediate the ends thereof, and forming a tubular string for use in a subterranean oil or gas well, as a function of the position of the tubular string within the well, as the tubular sections travel relative to the well head, the method comprising the steps of: determining the existence of defects on each tubular section as the tubular string travels relative to the well head; detecting the presence of an end coupling at the well head by discriminating between tubular sections intermediate the ends thereof and the end couplings of greater cross-sectional area; detecting the direction of movement of each end coupling relative to the well head; determining the order in which individual tubular sections travel past the well head; and determining the location of defects in the tubing string relative to an end coupling at one end of a tubular section, whereby the location of defects each tubular section can be determined by counting the end couplings traveling past the well head and determining the position of defects on each tubular section.
Claim 4
Independent Claim
210 words
A method of determining the location of defects in each of a series of tubular sections interconnected by end couplings having cross-sectional area at the end couplings greater than the cross-sectional area of the tubular sections intermediate the ends thereof, and forming a tubular string for use in a subterranean oil or gas well, as a function of the position of the tubular string within the well, as the tubular sections travel relative to the well head, the method comprising the steps of: determining the existence of defects on each tubular section as the tubular string travels relative to the well head; detecting the presence of an end coupling at the well head by discriminating between tubular sections intermediate the ends thereof and the end couplings of greater cross-sectional area; detecting the direction of movement of each end coupling relative to the well head; determining the order in which individual tubular sections travel past the well head; and determining the location of defects in the tubing string relative to an end coupling at one end of a tubular section, whereby the location of defects each tubular section can be determined by counting the end couplings traveling past the well head and determining the position of defects on each tubular section.
Claim 5
Independent Claim
292 words
A method of determining the existence of defects in a tubular string, formed by a series of tubular sections interconnected by end couplings having a cross-sectional area greater than the cross-sectional area of the tubular sections therebetween, used in a subterranean oil or gas well, during travel of the tubular sections relative to the well head, comprising the steps of: determining the existence of defects, including averge wall thickness reduction, corrosion pitting, and wear due to sucker rod interference by applying a magnetic field to the tubular string, as the tubular sections travel relative to the well head; detecting the presence of an end coupling at the well head by comparing the magnitude of an induced magnetic field in the tubular string at the well head to a predetermined magnitude being less than the magnitude of a field induced in an end coupling and greater than the magnitude of a field induced in a tubular section; measuring the time from the determination of the existence of a defect to the detection of the presence of an end coupling past the magnetic field; detecting the direction of movement of the induced magnetic field in each end coupling to determine the direction of movement of each end coupling relative to the well head; determining the location of defects in the tubular string relative to an end coupling at one end of a tubular section by counting the end couplings passing through the magnetic field; measuring the velocity of each tubular section relative to the well head simultaneously with the determination of the existence of the defects; and determining the position of defects in each tubular section relative to an end coupling at one end thereof in response to the measurements of velocity and time.
Claim 6
Independent Claim
292 words
A method of determining the existence of defects in a tubular string, formed by a series of tubular sections interconnected by end couplings having a cross-sectional area greater than the cross-sectional area of the tubular sections therebetween, used in a subterranean oil or gas well, during travel of the tubular sections relative to the well head, comprising the steps of: determining the existence of defects, including averge wall thickness reduction, corrosion pitting, and wear due to sucker rod interference by applying a magnetic field to the tubular string, as the tubular sections travel relative to the well head; detecting the presence of an end coupling at the well head by comparing the magnitude of an induced magnetic field in the tubular string at the well head to a predetermined magnitude being less than the magnitude of a field induced in an end coupling and greater than the magnitude of a field induced in a tubular section; measuring the time from the determination of the existence of a defect to the detection of the presence of an end coupling past the magnetic field; detecting the direction of movement of the induced magnetic field in each end coupling to determine the direction of movement of each end coupling relative to the well head; determining the location of defects in the tubular string relative to an end coupling at one end of a tubular section by counting the end couplings passing through the magnetic field; measuring the velocity of each tubular section relative to the well head simultaneously with the determination of the existence of the defects; and determining the position of defects in each tubular section relative to an end coupling at one end thereof in response to the measurements of velocity and time.
Claim 7
Dependent Claim
45 words
The method of claim 3 wherein the step of detecting the presence of the end couplings comprises inducing the magnetic field in each end coupling by the application of a uniform applied magnetic field to the portion of the tubular string at the well head.
Claim 8
Dependent Claim
72 words
The method of claim 3 wherein the step of detecting the direction of movement of the induced magnetic field to determine the direction of movement of each end coupling relative to the applied magnetic field is determined by generating two signals of opposite sign, the sequence of the two signals being dependent upon the direction of movement of the induced magnetic field in each end coupling relative to the applied magnetic field.
Claim 9
Dependent Claim
47 words
The method of claim 5 wherein the two signals of opposite sign are generated in response to magnetic lines of flux emanating from the induced magnetic field in each end coupling and oppositely directed relative to at least one detector fixed relative to the applied magnetic field.
Claim 10
Dependent Claim
191 words
Apparatus for determining the extent of defects in a tubular string, formed from a series of tubular sections interconnected by end couplings wherein the cross-sectional area at the end couplings is greater than the cross-sectional area of the tubular sections intermediate the ends thereof, used in a subterranean oil or gas well, as a function of the position of the tubular string within the well, as the tubular sections travel relative to the well head, the apparatus comprising: means for determining the existence of defects on each tubular section as the tubular string travels relative to the well head; means for detecting the presence of an end coupling at the well head by discriminating between tubular sections intermediate the ends thereof and the end couplings of greater cross-sectional area; means for detecting the direction of movement of each end coupling relative to the well head; and means for determining the location of defects in the tubing string relative to an end coupling at one end of a tubular section, whereby the location of defects on the tubular string can be determined by counting the end couplings traveling past the well head.
Claim 11
Dependent Claim
191 words
Apparatus for determining the extent of defects in a tubular string, formed from a series of tubular sections interconnected by end couplings wherein the cross-sectional area at the end couplings is greater than the cross-sectional area of the tubular sections intermediate the ends thereof, used in a subterranean oil or gas well, as a function of the position of the tubular string within the well, as the tubular sections travel relative to the well head, the apparatus comprising: means for determining the existence of defects on each tubular section as the tubular string travels relative to the well head; means for detecting the presence of an end coupling at the well head by discriminating between tubular sections intermediate the ends thereof and the end couplings of greater cross-sectional area; means for detecting the direction of movement of each end coupling relative to the well head; and means for determining the location of defects in the tubing string relative to an end coupling at one end of a tubular section, whereby the location of defects on the tubular string can be determined by counting the end couplings traveling past the well head.
Claim 12
Dependent Claim
37 words
The apparatus of claim 7 wherein the means for determining the existence of defects on each tubular section comprises means for determining defects including average wall thickness reduction, corrosion pitting, and wear due to sucker rod interference.
Claim 13
Dependent Claim
21 words
The apparatus of claim 8 wherein the means for determining the existence of defects on each tubular section comprises magnetic means.
Claim 14
Dependent Claim
70 words
The apparatus of claim 9 wherein the magnetic means comprises means for applying a uniform magnetic field to each tubular section during movement thereof, and the means for detecting the direction of movement of each end coupling comprises means for detecting the direction of movement relative to the well head of an induced magnetic field in each end coupling induced by the uniform magnetic field applied to each tubular section.
Claim 15
Dependent Claim
46 words
The apparatus of claim 7 wherein the means for detecting the direction of movement of each end coupling comprises means for applying a magnetic field to each end coupling and means for detecting the direction of movement of an induced magnetic field in each end coupling.
Claim 16
Dependent Claim
47 words
The apparatus of claim 11 wherein the means for detecting the direction of movement of the induced magnetic field further comprises means fixed relative to the well head for applying a uniform applied magnetic field to each tubular section at the well head during relative movement thereof.
Claim 17
Dependent Claim
56 words
The apparatus of claim 12 wherein the means for detecting the direction of movement of the induced magnetic field comprises means for generating two signals of opposite sign, the sequence of the two signals being dependent upon the direction of movement of the induced magnetic field in each end coupling relative to the applied magnetic field.
Claim 18
Dependent Claim
45 words
The apparatus of claim 13 wherein the two signals of opposite sign are generated in response to magnetic lines of flux emanating from the induced magnetic field in each end coupling and oppositely directed relative to detector means fixed relative to the applied magnetic field.
Claim 19
Dependent Claim
18 words
The apparatus of claim 14 wherein the detector means comprises at least one detector responsive to Hall effect.
Claim 20
Dependent Claim
30 words
The apparatus of claim 13 wherein the two signals of opposite sign are generated in response to a difference in orientation of the induced magnetic field relative to detector means.
Claim 21
Dependent Claim
22 words
The apparatus of claim 16 wherein the detector means comprises two spaced apart detectors oppositely oriented relative to the induced magnetic field.
Claim 22
Dependent Claim
19 words
The apparatus of claim 17 wherein the two spaced apart detectors comprise encircling coils, wound in turn reverse relationship.
Claim 23
Dependent Claim
29 words
The apparatus of claim 7 wherein the means for detecting the presence of an end coupling comprises means for magnetically detecting the increased cross-sectional area at the end couplings.
Claim 24
Dependent Claim
49 words
The apparatus of claim 19 wherein the means for magnetically detecting the increased cross-sectional area at the end couplings comprises an encircling coil, the electric current generated in the encircling coil being dependent upon the magnitude of an induced magnetic field in the end couplings and the tubular sections.
Claim 25
Dependent Claim
222 words
Apparatus for detecting the relative movement of tubular sections forming a tubular string past the well head of a subterranean oil or gas well, wherein the tubular sections are joined together by end couplings having a cross-sectional area greater than the cross-sectional area of the tubular sections intermediate the ends thereof, the apparatus comprising: means for applying an applied magnetic field to the tubular sections at the well head; coil means encircling the tubular sections at the well head for generating an electric signal dependent upon the induced magnetic field induced in the relatively moving tubular sections at the well head; at least one detector fixed relative to the well head comprising means for generating signals of opposite signs in response to changes in the orientation of magnetic lines of flux emanating from the induced magnetic field as each end coupling moves relative thereto; and means for comparing the electric signal generated in the coil means with a reference signal greater than the signal generated by induced magnetic field in the tubular sections intermediate the ends thereof to detect the presence of an end coupling in the vicinity of the well head; and means for detecting the sequence of the signs of signals generated in the detector to determine the direction of movement of the end coupling relative to the well head.
Claim 26
Dependent Claim
222 words
Apparatus for detecting the relative movement of tubular sections forming a tubular string past the well head of a subterranean oil or gas well, wherein the tubular sections are joined together by end couplings having a cross-sectional area greater than the cross-sectional area of the tubular sections intermediate the ends thereof, the apparatus comprising: means for applying an applied magnetic field to the tubular sections at the well head; coil means encircling the tubular sections at the well head for generating an electric signal dependent upon the induced magnetic field induced in the relatively moving tubular sections at the well head; at least one detector fixed relative to the well head comprising means for generating signals of opposite signs in response to changes in the orientation of magnetic lines of flux emanating from the induced magnetic field as each end coupling moves relative thereto; and means for comparing the electric signal generated in the coil means with a reference signal greater than the signal generated by induced magnetic field in the tubular sections intermediate the ends thereof to detect the presence of an end coupling in the vicinity of the well head; and means for detecting the sequence of the signs of signals generated in the detector to determine the direction of movement of the end coupling relative to the well head.
Claim 27
Dependent Claim
20 words
The apparatus of claim 21 wherein the detector comprises an element for generating a signal in response to Hall effect.
Claim 28
Dependent Claim
55 words
The method of claim 1, further comprising: measuring the velocity of each tubular section relative to the well head simultaneously with the determination of the existence of the defects; and determining the position of defects in each tubular section relative to an end coupling at one end thereof in response to the measurement of velocity.
Claim 29
Dependent Claim
72 words
The method of claim 1, wherein the step the detecting the direction of movement of the induced magnetic field to determine the direction of movement of each end coupling relative to the applied magnetic field is determined by generating two signals of opposite sign, the sequence of the two signals being dependent upon the direction of movement of the induced magnetic field to each end coupling relative to the applied magnetic field.
Claim 30
Dependent Claim
59 words
The apparatus of claim 7, further comprising: means for measuring the velocity of each tubular section relative to the well head simultaneously with the determination of the existence of the defects; and means for determining the position of defects in each tubular section relative to an end coupling at one end thereof in response to the measurement of velocity.
Claim 31
Dependent Claim
80 words
The apparatus of claim 21, further comprising: means for determining the existence of defects on each tubular section as the tubular string travels relative to the well head; means for measuring the velocity of each tubular section relative to the well head simultaneously with the determination of the existence of the defects; and means for determining the position of defects in each tubular section relative to an end coupling at one end thereof in response to the measurement of velocity.
Claim 32
Dependent Claim
33 words
The apparatus of claim 26, wherein the means for determining the existence of defects in each tubular section comprises means for determining defects including wall thickness defects, corrosion pitting defects, and axially-extending defects.
References Cited (Backward Citations)
US2467306A
Cited
US2527000A
Cited
US2886772A
Cited
US2882488A
Cited
US2926335A
Cited
GB913780A
Cited
US3197693A
Cited
US3103976A
Cited
US3343079A
Cited
US3401332A
Cited
US3237446A
Cited
US3337796A
Cited
US3560845A
Cited
US3379970A
Cited
US3328681A
Cited
US3529236A
Cited
US3609530A
Cited
US3538433A
Cited
US3555412A
Cited
US3579099A
Cited
US3693075A
Cited
US3612987A
Cited
US4101832A
Cited
US3835374A
Cited
US3843923A
Cited
US3940689A
Cited
US3916301A
Cited
US4096437A
Cited
US4079310A
Cited
US4061967A
Cited
US4247819A
Cited
US4292588A
Cited
US4270088A
Cited
US4292589A
Cited
US4379261A
Cited
US4485344A
Cited
US4538108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |