Patent US5076364A successfully refreshed from Google Patents.
US5076364A
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Gas hydrate inhibition
Assignee: Shell USA Inc
•
Filing: 1991-03-19
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Granted: 1991-12-31
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Expires: 2011-03-19
Abstract
Abstract Gas hydrate formation in a gas well is prevented by injecting a carrier and an alcohol (e.g., glycerol or a glycerol derivative) into the well and connected facilities/pipelines.
Inventors
- 👤 Arthur H. Hale
- 👤 Ashok K. R. Dewan
- 👤 George C. Blytas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:05
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; E; E21; E21B; E21B37/00; E21B37/06; E21B43/00; C09K2208/00; C09K2208/22; Y; Y10; Y10S; Y10S507/00; Y10S507/925
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
33 words
A process for inhibiting gas hydrate formation in the production fluid of a well, connected facilities and pipelines of the well comprising injecting into the well inhibitor comprising a carrier and a polycyclicpolyetherpolyol.
Claim 2
Dependent Claim
33 words
A process for inhibiting gas hydrate formation in the production fluid of a well, connected facilities and pipelines of the well comprising injecting into the well inhibitor comprising a carrier and a polycyclicpolyetherpolyol.
Claim 3
Dependent Claim
41 words
The method of claim 1 wherein the polycyclicpolyetherpolyol which is characterized by binodal molecular weight distribution, M w in excess of 50,000, said M w being determined in a three-column gel permeation chromatography, and being 0.5 to 10% w epoxy structures.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the polycyclicpolyetherpolyol is further characterized by molecular structures which are no more than 20% free of associated cyclic formations.
Claim 5
Dependent Claim
90 words
A process for shutting-in a well having a fluid therein which is susceptible to the formation of gas hydrates, comprising: preparing a gas hydrate inhibitor by admixing an alcohol with a carrier, said carrier and said alcohol and the quantities thereof being selected to be compatible with the well and effective to prevent the formation of gas hydrates in said well fluid; selecting an appropriate location, depending upon the type of well being shut-in, and injecting the gas hydrate inhibitor into said well at said location; and shutting-in the well.
Claim 6
Dependent Claim
90 words
A process for shutting-in a well having a fluid therein which is susceptible to the formation of gas hydrates, comprising: preparing a gas hydrate inhibitor by admixing an alcohol with a carrier, said carrier and said alcohol and the quantities thereof being selected to be compatible with the well and effective to prevent the formation of gas hydrates in said well fluid; selecting an appropriate location, depending upon the type of well being shut-in, and injecting the gas hydrate inhibitor into said well at said location; and shutting-in the well.
Claim 7
Dependent Claim
13 words
The process of claim 4 wherein the hydrate inhibitor includes an inorganic salt.
Claim 8
Dependent Claim
33 words
The process of claim 4 wherein the hydrate inhibitor includes from 5% by weight to 25% by weight salt and wherein the alcohol is from 10% by weight to 40% by weight glycerol.
Claim 9
Dependent Claim
34 words
The process of claim 4 wherein the well is an offshore tension leg platform and the hydrate inhibitor injection location is selected from a connected facilities/pipeline or tubing above or below the mud line.
Claim 10
Dependent Claim
53 words
The process of claim 4 wherein the shut-in is for emergency purposes, the well is to be temporarily abandoned by a drill-ship, and the hydrate inhibitor is in the form of a pill comprising drilling fluid carrier admixed with said alcohol, said pill being injected into a blowout preventor associated with the well.
Claim 11
Dependent Claim
32 words
The process of claim 4 wherein the well is a producing well which is to be temporarily shut-in, the hydrate inhibitor being injected into the well tubing and mixing with produced water.
Claim 12
Dependent Claim
22 words
The process of claim 4 wherein the carrier is selected from the group consisting of polymer-based drilling fluids and bentonite-based drilling fluids.
Claim 13
Dependent Claim
67 words
The process of claim 4 wherein the alcohol is selected from the group consisting of (1) an acyclic polyol having 3 to 80 carbon atoms and 2 to 60 hydroxyl groups, (2) a monocyclicpolyol having 5 to 30 carbon atoms and 2 to 10 hydroxyl groups, and (3) a cyclicetherpolyol having 6 to 1800 carbon atoms, 2 to 450 hydroxyl groups, and 2 to 600 ether linkages.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |