Patent US3905423A successfully refreshed from Google Patents.
US3905423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of protecting well apparatus against contamination during handling
Assignee: ConocoPhillips Co
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Filing: 1974-05-01
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Granted: 1975-09-16
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Expires: 1994-05-01
Abstract
Abstract A method of protecting downhole well apparatus having openings therein or movable parts during handling of such apparatus, particularly during positioning thereof in a wellbore, comprising; filling the openings or coating the movable parts with a blend of a wax and a polymer, handling the so-treated apparatus such as positioning the same in a wellbore, and removing the filling or coating blend from the openings or movable parts.
Inventors
- 👤 Derry D Sparlin
- 👤 Jr Clarence B Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:13
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A METHOD OF PLACING A CAVITYCONTAINING WELL APPARATUS DOWNHOLE IN A WELLBORE COMPRISING: A. BLENDING TOGETHER FROM 25 TO 80 PARTS BY WEIGHT OF A PARAFFIN WAX HEATED TO A TEMPERATURE ABOVE ITS MELTING POINT AND FROM 75 TO 20 PARTS BY WEIGHT OF A POLYMER SELECTED FROM THE CLASS CONSISTING OF POLYTERPENES, POLYVINYL ACETATES, POLYOLEFINS, POLYAMIDES AND ROSIN ESTERS TO FROM THE MELTED WAX-POLYMER BLEND HAVING A SOFTENING POINT 10-15*F BELOW ITS MELTING POINT, B. FILLING THE CAVITY OF THE WELL APPARATUS WITH THE MELTED WAX-POLYMER BLEND, C. SOLIDFYING THE WAX-POLYMER BLEND, D. POSITIONING THE SO-TREATED WELL APPARATUS DOWNHOLE IN A WELLBORE, AND E. REMOVING THE WAX-POLYMER BLEND FROM THE CAVITY.
Claim 2
Independent Claim
112 words
A METHOD OF PLACING A CAVITYCONTAINING WELL APPARATUS DOWNHOLE IN A WELLBORE COMPRISING: A. BLENDING TOGETHER FROM 25 TO 80 PARTS BY WEIGHT OF A PARAFFIN WAX HEATED TO A TEMPERATURE ABOVE ITS MELTING POINT AND FROM 75 TO 20 PARTS BY WEIGHT OF A POLYMER SELECTED FROM THE CLASS CONSISTING OF POLYTERPENES, POLYVINYL ACETATES, POLYOLEFINS, POLYAMIDES AND ROSIN ESTERS TO FROM THE MELTED WAX-POLYMER BLEND HAVING A SOFTENING POINT 10-15*F BELOW ITS MELTING POINT, B. FILLING THE CAVITY OF THE WELL APPARATUS WITH THE MELTED WAX-POLYMER BLEND, C. SOLIDFYING THE WAX-POLYMER BLEND, D. POSITIONING THE SO-TREATED WELL APPARATUS DOWNHOLE IN A WELLBORE, AND E. REMOVING THE WAX-POLYMER BLEND FROM THE CAVITY.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the cavity is filled by brushing the melted blend into the cavity.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the blend is solidified by allowing the blend to cool to ambient temperature.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the apparatus is a screen, slotted liner or packer.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein the blend is removed from the cavity by contacting the blend with a solvent selected from the group consisting of crude oil, diesel fuel, kerosene or xylene.
References Cited (Backward Citations)
US3273641A
Cited
US3057405A
Cited
US3316965A
Cited
US3268001A
Cited
US3333635A
Cited
US3302719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |