Patent US4756326A successfully refreshed from Google Patents.
US4756326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric drag reducer performance by injection through a land-length die
Assignee: ConocoPhillips Co
•
Filing: 1987-07-13
•
Granted: 1988-07-12
•
Expires: 2007-07-13
Abstract
Abstract Drag reduction in fluids flowing through conduits is improved by the injection of high molecular weight fluid soluble drag-reducing polymers through land-length dies having multiple openings.
Inventors
- 👤 Ray L. Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:26
CPC Classifications
C; C09; C09K; C09K3/00; F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0391; Y10T137/8593; Y10T137/87571; Y10T137/87652
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
An improved method for the injection of high molecular weight polymers into conduits containing flowing liquid comprising injecting said polymers as a solution containing up to 50% polymer through at least one die having multiple openings substantially at the injection end of the die, wherein the die is a land-length die, said land-length for each die opening being determined by the ratio L/D, where L is the length of the land and D is the diameter of the die opening, and wherein L/D is at least 1.0.
Claim 2
Dependent Claim
87 words
An improved method for the injection of high molecular weight polymers into conduits containing flowing liquid comprising injecting said polymers as a solution containing up to 50% polymer through at least one die having multiple openings substantially at the injection end of the die, wherein the die is a land-length die, said land-length for each die opening being determined by the ratio L/D, where L is the length of the land and D is the diameter of the die opening, and wherein L/D is at least 1.0.
Claim 3
Dependent Claim
63 words
A method is described in claim 1 comprising injecting said polymers as a solution containing up to 50% polymer through at least one die wherein the die is a land-length die, said land-length determined by the ratio L/D, where L is the length of the land and D is each hydraulic diameter of the die opening, and wherein L/D is at least 10.
Claim 4
Dependent Claim
17 words
A method is described in claim 2 wherein the L/D is from about 20 to about 50.
Claim 5
Dependent Claim
31 words
A method as described in claim 1, 2 or 3 wherein the injected polymer is a high molecular weight, non-crystalline hydrocarbon soluble polymer and the flowing liquid is a hydrocarbon liquid.
Claim 6
Dependent Claim
36 words
A method as described in claim 4 wherein the die openings at the injection end of the die are at varying distances from the conduit wall, and wherein each opening has substantially the same L/D ratio.
References Cited (Backward Citations)
US3601079A
Cited
US3826279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |