US3585857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free point indicator apparatus
Assignee: Individual
•
Filing: 1969-01-17
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Granted: 1971-06-22
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Expires: 1989-01-17
Abstract
Abstract An improved free point indicator apparatus for indicating whether pipe in a well is free or stuck at particular elevations. A tapered, notched control rod coacts with a pivoted catch finger to indicate relative movement between two pipe sections.
Inventors
- 👤 Lawrence K Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:53
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/09
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
264 words
An apparatus for determining the elevations of stuck and free portions of pipe in a well, comprising: a. a free point indicator tool having: 1. an upper section and a lower section mounted for longitudinal movement relative to each other; 2. friction means on each of said sections for frictionally engaging the inside of a pipe to thereby cause said upper section to move upwardly relative to said lower section upon a stretching of the pipe; 3. stretch response means forming part of the tool for multiplying the amount of movement of said upper section relative to said lower section; b. a wire line operably connected to said stretch response means and extending to the surface for movement at the surface in accordance with the movement of said stretch response means; c. a measuring wheel for measuring the amount of movement of said wire line; d. a meter operably connected to said measuring wheel and calibrated to indicate the stretch in the pipe; e. a finger pivotally mounted on one of said sections; f. a stop surface on the other of said sections adapted to be engaged by said finger for controlling the extent of pivoting of said finger in accordance with the relative movement of said upper section relative to said lower section; and g. a control rod movable longitudinally relative to said sections and said finger and having a surface adapted to be engaged by said finger for limiting the extent of longitudinal movement of said rod in proportion to the longitudinal movement of said upper section relative to said lower section.
Claim 2
Independent Claim
264 words
An apparatus for determining the elevations of stuck and free portions of pipe in a well, comprising: a. a free point indicator tool having: 1. an upper section and a lower section mounted for longitudinal movement relative to each other; 2. friction means on each of said sections for frictionally engaging the inside of a pipe to thereby cause said upper section to move upwardly relative to said lower section upon a stretching of the pipe; 3. stretch response means forming part of the tool for multiplying the amount of movement of said upper section relative to said lower section; b. a wire line operably connected to said stretch response means and extending to the surface for movement at the surface in accordance with the movement of said stretch response means; c. a measuring wheel for measuring the amount of movement of said wire line; d. a meter operably connected to said measuring wheel and calibrated to indicate the stretch in the pipe; e. a finger pivotally mounted on one of said sections; f. a stop surface on the other of said sections adapted to be engaged by said finger for controlling the extent of pivoting of said finger in accordance with the relative movement of said upper section relative to said lower section; and g. a control rod movable longitudinally relative to said sections and said finger and having a surface adapted to be engaged by said finger for limiting the extent of longitudinal movement of said rod in proportion to the longitudinal movement of said upper section relative to said lower section.
Claim 3
Dependent Claim
35 words
friction means on each of said sections for frictionally engaging the inside of a pipe to thereby cause said upper section to move upwardly relative to said lower section upon a stretching of the pipe;
Claim 4
Dependent Claim
35 words
friction means on each of said sections for frictionally engaging the inside of a pipe to thereby cause said upper section to move upwardly relative to said lower section upon a stretching of the pipe;
Claim 5
Dependent Claim
39 words
a stop surface on the other of said sections adapted to be engaged by said finger for controlling the extent of pivoting of said finger in accordance with the movement of said upper section relative to said lower section;
Claim 6
Dependent Claim
39 words
a stop surface on the other of said sections adapted to be engaged by said finger for controlling the extent of pivoting of said finger in accordance with the movement of said upper section relative to said lower section;
Claim 7
Dependent Claim
54 words
The structure set forth in claim 1, wherein said surface on said control rod includeS: a. a plurality of longitudinally spaced notches disposed thereon at an angle to the central axis of said rod, with the lateral distance from the finger being least at the lowermost notch and the greatest at the uppermost notch.
Claim 8
Dependent Claim
123 words
The structure set forth in claim 1, wherein said surface on said control rod includes: a. a plurality of longitudinally spaced notches disposed thereon at an angle to the central axis of said rod, with the lateral distance from the finger being least at the lowermost notch and the greatest at the uppermost notch; b. said finger having a pointed end which is pivoted inwardly by coaction with said stop surface upon a stretching of the pipe to an extent corresponding to the stretch in the pipe for engaging in one of said notches upon an upward movement of said control rod relative to said finger to thereby stop further upward movement of said control rod relative to said finger and said sections.
Claim 9
Dependent Claim
187 words
stretch response means forming part of the tool for multiplying the amount of movement of said upper section relative to said lower section; b. a wire line operably connected to said stretch response means and extending to the surface for movement at the surface in accordance with the movement of said stretch response means; c. a measuring wheel for measuring the amount of movement of said wire line; d. a meter operably connected to said measuring wheel and calibrated to indicate the stretch in the pipe; e. a finger pivotally mounted on one of said sections; f. a stop surface on the other of said sections adapted to be engaged by said finger for controlling the extent of pivoting of said finger in accordance with the relative movement of said upper section relative to said lower section; and g. a control rod movable longitudinally relative to said sections and said finger and having a surface adapted to be engaged by said finger for limiting the extent of longitudinal movement of said rod in proportion to the longitudinal movement of said upper section relative to said lower section.
Claim 10
Dependent Claim
187 words
stretch response means forming part of the tool for multiplying the amount of movement of said upper section relative to said lower section; b. a wire line operably connected to said stretch response means and extending to the surface for movement at the surface in accordance with the movement of said stretch response means; c. a measuring wheel for measuring the amount of movement of said wire line; d. a meter operably connected to said measuring wheel and calibrated to indicate the stretch in the pipe; e. a finger pivotally mounted on one of said sections; f. a stop surface on the other of said sections adapted to be engaged by said finger for controlling the extent of pivoting of said finger in accordance with the relative movement of said upper section relative to said lower section; and g. a control rod movable longitudinally relative to said sections and said finger and having a surface adapted to be engaged by said finger for limiting the extent of longitudinal movement of said rod in proportion to the longitudinal movement of said upper section relative to said lower section.
Claim 11
Dependent Claim
72 words
a control rod movable longitudinally relative to said sections and having a plurality of longitudinally spaced notches disposed thereon at an angle to the central axis of said rod for the engagement of said finger in one of said notches to limit the extent of longitudinal movement of said rod relative to said finger and said sections in proportion to the longitudinal movement of said upper section relative to said lower section.
Claim 12
Dependent Claim
72 words
a control rod movable longitudinally relative to said sections and having a plurality of longitudinally spaced notches disposed thereon at an angle to the central axis of said rod for the engagement of said finger in one of said notches to limit the extent of longitudinal movement of said rod relative to said finger and said sections in proportion to the longitudinal movement of said upper section relative to said lower section.
Claim 13
Dependent Claim
40 words
The structure set forth in claim 1, including: a. resilient means for applying a constant force urging said finger in a direction towards said stop surface and for movement relative thereto as permitted by the position of said stop surface.
Claim 14
Dependent Claim
90 words
A free point indicator tool, comprising: a. an upper section and a lower section mounted for longitudinal movement relative to each other; b. friction means on each of said sections for frictionally engaging the inside of a pipe to thereby cause said upper section to move upwardly relative to said lower section upon a stretching of the pipe; c. a stretch response means forming part of the tool for multiplying the amount of movement of said upper section relative to said lower section; and d. said stretch response means including:
Claim 15
Dependent Claim
90 words
A free point indicator tool, comprising: a. an upper section and a lower section mounted for longitudinal movement relative to each other; b. friction means on each of said sections for frictionally engaging the inside of a pipe to thereby cause said upper section to move upwardly relative to said lower section upon a stretching of the pipe; c. a stretch response means forming part of the tool for multiplying the amount of movement of said upper section relative to said lower section; and d. said stretch response means including:
Claim 16
Dependent Claim
46 words
The structure set forth in claim 5, including: a. resilient means for applying a constant force urging said finger against said stop surface for effecting a pivoting of said finger upon a stretching of the pipe to an extent corresponding to the stretch in the pipe.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |