US3762218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stock point indicating device with linear sensing means
Assignee: Western Atlas International Inc
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Filing: 1971-08-19
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Granted: 1973-10-02
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Expires: 1991-08-19
Abstract
Abstract The body of the device, consisting of two relatively movable sections, is lowered into a well at the end of a cable. A bow spring anchor assembly is mounted upon each of the sections in a manner that allows the sections to rotate freely and move axially relative to the bow springs until a measurement is to be made. The sections are locked to the anchor assemblies upon command from the surface and a stuck point measurement is made. A sensing means in the body of the device detects relative movement of the two sections and produces a linear signal representing said movement. The sensing means includes a movable spiral wedgeshaped element.
Inventors
- 👤 M Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:34
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
An apparatus for determining the point a pipe is stuck in a well, comprising: an upper body; an upper anchor assembly positioned on said upper body for connecting said upper body to said pipe; upper controllable means positioned on said upper body for allowing said upper body to move relative to said upper anchor assembly and for selectively locking said upper body to said upper anchor assembly; a lower body; a lower anchor assembly positioned on said lower body for connecting said lower body to said pipe; means for connecting said upper and lower bodies; means for allowing said upper and lower bodies to rotate relative to each other; and sensor means for sensing relative rotation of said upper and lower bodies.
Claim 2
Independent Claim
122 words
An apparatus for determining the point a pipe is stuck in a well, comprising: an upper body; an upper anchor assembly positioned on said upper body for connecting said upper body to said pipe; upper controllable means positioned on said upper body for allowing said upper body to move relative to said upper anchor assembly and for selectively locking said upper body to said upper anchor assembly; a lower body; a lower anchor assembly positioned on said lower body for connecting said lower body to said pipe; means for connecting said upper and lower bodies; means for allowing said upper and lower bodies to rotate relative to each other; and sensor means for sensing relative rotation of said upper and lower bodies.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 wherein said upper controllable means includes a collar rotatably mounted on said upper body and an electromagnet positioned on said upper body approximate said collar.
Claim 4
Dependent Claim
39 words
The apparatus of claim 1 including lower controllable means positioned on said lower body for allowing said lower body to move relative to said lower anchor assembly and for selectively locking said lower body to said lower anchor assembly.
Claim 5
Dependent Claim
23 words
The apparatus of claim 1 including means for allowing a limited amount of axial movement between said upper body and said lower body.
Claim 6
Dependent Claim
47 words
The apparatus of claim 4 wherein said sensor means includes a variable inductance for sensing relative movement of said upper and lower bodies, said variable inductance including a fixed portion connected to one of said bodies and a movable portion connected to the other of said bodies.
Claim 7
Independent Claim
156 words
An apparatus for determining the point a pipe is stuck in a well, comprising: an upper body; an upper anchor assembly positioned on said upper body for connecting said upper body to said pipe, said upper anchor assembly including a collar rotatably mounted on said upper body and an electromagnet positioned in said upper body approximate said collar; a lower body; a lower anchor assembly positioned on said lower body for connecting said lower body to said pipe; means for connecting said upper and lower bodies; means for allowing said upper and lower bodies to rotate relative to each other; means for allowing a limited amount of axial movement between said upper body and said lower body; and variable inductance means for sensing relative movement of said upper and lower bodies, said variable inductance means including a fixed portion connected to one of said bodies and a movable portion connected to the other of said bodies.
Claim 8
Independent Claim
156 words
An apparatus for determining the point a pipe is stuck in a well, comprising: an upper body; an upper anchor assembly positioned on said upper body for connecting said upper body to said pipe, said upper anchor assembly including a collar rotatably mounted on said upper body and an electromagnet positioned in said upper body approximate said collar; a lower body; a lower anchor assembly positioned on said lower body for connecting said lower body to said pipe; means for connecting said upper and lower bodies; means for allowing said upper and lower bodies to rotate relative to each other; means for allowing a limited amount of axial movement between said upper body and said lower body; and variable inductance means for sensing relative movement of said upper and lower bodies, said variable inductance means including a fixed portion connected to one of said bodies and a movable portion connected to the other of said bodies.
Claim 9
Dependent Claim
30 words
The apparatus of claim 6 wherein said lower anchor assembly includes a collar rotatably mounted upon said lower body and an electromagnet positioned in said lower body proximate said collar.
References Cited (Backward Citations)
US2530309A
Cited
US3006186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |