Patent US4796701A successfully refreshed from Google Patents.
US4796701A
Expired / Lapsed
US
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Pyrolytic carbon coating of media improves gravel packing and fracturing capabilities
Assignee: Schlumberger Technology Corp
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Filing: 1987-07-30
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Granted: 1989-01-10
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Expires: 2007-07-30
Abstract
Abstract A pyrolytic carbon coated particle for use in well fracturing and sand control applications comprising: a thermally stable substantially spherical substrate particle (e.g., ceramic composite bead or the like) and a substantially uniform layer of pyrolytically deposited carbon encapsulating said thermally stable substantially spherical substrate particle. Such carbon coated particles exhibit physical properties superior to materials commonly used in gravel pack and well fracturing operations as well as improved chemical resistance to acids, organics and steam.
Inventors
- 👤 Tommy E. Hudson
- 👤 James W. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:45
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/92; C04; C04B; C04B41/00; C04B41/45; C04B41/4584; C09K8/62; C09K8/66; C09K8/665; C09K8/80; E; E21; E21B; E21B43/00; E21B43/02; E21B43/04; E21B43/25; E21B43/26; E21B43/267; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A method for placement of particles in a well comprising the steps of: (a) providing pyrolytic carbon coated particles comprised of a thermally stable substantially spherical substrate particles and a substantially uniform layer of pyrolytically deposited carbon encapsulating each of said thermally stable substantially spherical substrate particles; (b) suspending said prolytic carbon coated particles in a fluid; and (c) pumping said fluid with suspended pyrolytic carbon coated particles into a well.
Claim 2
Independent Claim
71 words
A method for placement of particles in a well comprising the steps of: (a) providing pyrolytic carbon coated particles comprised of a thermally stable substantially spherical substrate particles and a substantially uniform layer of pyrolytically deposited carbon encapsulating each of said thermally stable substantially spherical substrate particles; (b) suspending said prolytic carbon coated particles in a fluid; and (c) pumping said fluid with suspended pyrolytic carbon coated particles into a well.
Claim 3
Dependent Claim
18 words
A method of claim 1 wherein said thermally stable substantially spherical substrate particle is a ceramic composite bead.
Claim 4
Dependent Claim
24 words
A method of claim 1 wherein said layer of pyrolytically deposited carbon has a density range of from about 1.50 to about 2.05 gm/cc.
Claim 5
Dependent Claim
24 words
A method of claim 2 wherein said layer of pyrolytically deposited carbon has a density range of from about 1.50 to about 2.05 gm/cc.
Claim 6
Dependent Claim
21 words
A method of claim 1 wherein said layer of pyrolytically deposited carbon is a layer of substantially laminar oriented carbon deposit.
Claim 7
Dependent Claim
21 words
A method of claim 2 wherein said layer of pyrolytically deposited carbon is a layer of substantially laminar oriented carbon deposit.
Claim 8
Dependent Claim
17 words
A method of claim 1 wherein said carbon layer ranges from about 5μ to about 200μ thick.
Claim 9
Dependent Claim
17 words
A method of claim 2 wherein said carbon layer ranges from about 5μ to about 200μ thick.
Claim 10
Dependent Claim
17 words
A method of claim 3 wherein said carbon layer ranges from about 5μ to about 200μ thick.
Claim 11
Dependent Claim
17 words
A method of claim 4 wherein said carbon layer ranges from about 8μ to about 200μ thick.
Claim 12
Dependent Claim
17 words
A method of claim 5 wherein said carbon layer ranges from about 5μ to about 200μ thick.
Claim 13
Dependent Claim
17 words
A method of claim 6 wherein said carbon layer ranges from about 5μ to about 200μ thick.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |