Patent US3998744A successfully refreshed from Google Patents.
US3998744A
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US
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Oil fracturing spacing agents
Assignee: Standard Oil Co
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Filing: 1975-04-16
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Granted: 1976-12-21
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Expires: 1995-04-16
Abstract
Abstract Oil-soluble spacing agents for use in fracturing underground oil or gas formations comprising polymerized dimethyl-alpha-methylstyrenes.
Inventors
- 👤 Vernon W. Arnold
- 👤 Robert J. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:04
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S507/924
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
Substantially spherical deformable oil-soluble resin spacing particles having a softening point within the range 200° to 325° F. and a mesh size between 4 to 20 mesh, said resin selected from the group consisting of oil-soluble homopolymers of 3, 4, dimethyl alpha methyl styrene and oil soluble copolymers wherein the monomer units are 3, 4, dimethyl alpha methyl styrene and 3, 5 dimethyl alpha methyl styrene.
Claim 2
Dependent Claim
66 words
Substantially spherical deformable oil-soluble resin spacing particles having a softening point within the range 200° to 325° F. and a mesh size between 4 to 20 mesh, said resin selected from the group consisting of oil-soluble homopolymers of 3, 4, dimethyl alpha methyl styrene and oil soluble copolymers wherein the monomer units are 3, 4, dimethyl alpha methyl styrene and 3, 5 dimethyl alpha methyl styrene.
Claim 3
Dependent Claim
13 words
The spacing particles of claim 1 where the resin constitutes homopolymers of 3,4-dimethyl-alpha-methylstyrene.
Claim 4
Dependent Claim
17 words
The spacing particles of claim 2 having a softening point within the range 245° to 325° F.
Claim 5
Dependent Claim
110 words
In a process for fracturing a formation penetrated by a well, whereby a slurry of propping and oil-soluble spacing particles are injected under pressure through a well-hole into an oil- or gas-bearing geologic strata, the improvement which comprises including within a fracturing fluid effective proportions of substantially spherical deformable oil-soluble resin spacing particles having a softening point within the range 200°-320° F and a mesh size between 4 and 20 mesh, said resin selected from the group consisting of oil-soluble homopolymers of 3, 4, dimethyl alpha methyl styrene and oil soluble copolymers wherein the monomer units are 3, 4, dimethyl alpha methyl styrene and 3, 5 dimethyl alpha methyl styrene.
Claim 6
Dependent Claim
110 words
In a process for fracturing a formation penetrated by a well, whereby a slurry of propping and oil-soluble spacing particles are injected under pressure through a well-hole into an oil- or gas-bearing geologic strata, the improvement which comprises including within a fracturing fluid effective proportions of substantially spherical deformable oil-soluble resin spacing particles having a softening point within the range 200°-320° F and a mesh size between 4 and 20 mesh, said resin selected from the group consisting of oil-soluble homopolymers of 3, 4, dimethyl alpha methyl styrene and oil soluble copolymers wherein the monomer units are 3, 4, dimethyl alpha methyl styrene and 3, 5 dimethyl alpha methyl styrene.
Claim 7
Dependent Claim
12 words
The process of claim 4 where the resin constitutes homopolymers of 3,4-dimethyl-alpha-methylstyrene.
Claim 8
Dependent Claim
21 words
The process of claim 5 in which the spacing particles have a softening point within the range 245° to 325° F.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |