US5238070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential actuating system for downhole tools
Assignee: Halliburton Co
•
Filing: 1992-02-19
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Granted: 1993-08-24
•
Expires: 2012-02-19
Abstract
Abstract A differential pressure actuating system for downhole tools provides endless operation by the use of the differential pressure between two isolated zones of a well as a power source for the tool. That differential pressure is applied across a power transfer element to operate the downhole tool.
Inventors
- 👤 Roger L. Schultz
- 👤 Kevin R. Manke
- 👤 Neal G. Skinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:40
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B23/00; E21B23/04; E21B23/0412; E21B23/042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A downhole tool apparatus, comprising: a housing having a power chamber defined therein, and having power passage means defined in said housing for providing fluid pressure communication between said power chamber and first and second zones of a well; and pressure transfer control means for selectively applying a pressure differential between said first and second zones of said well across said power chamber to operate said downhole tool apparatus.
Claim 2
Dependent Claim
69 words
A downhole tool apparatus, comprising: a housing having a power chamber defined therein, and having power passage means defined in said housing for providing fluid pressure communication between said power chamber and first and second zones of a well; and pressure transfer control means for selectively applying a pressure differential between said first and second zones of said well across said power chamber to operate said downhole tool apparatus.
Claim 3
Dependent Claim
47 words
The apparatus of claim 1, further comprising: a power piston slidably disposed in said power chamber; and wherein said pressure transfer control means is further characterized as a means for applying said pressure differential across said power piston repeatedly in alternating directions to repeatedly operate said tool.
Claim 4
Dependent Claim
60 words
A downhole tool apparatus, comprising: a housing having a power chamber defined therein; power passage means for providing fluid pressure communication between said power chamber and first and second zones of a well; and pressure transfer control means for using a pressure differential between said first and second zones of said well as a power source to said power chamber.
Claim 5
Dependent Claim
60 words
A downhole tool apparatus, comprising: a housing having a power chamber defined therein; power passage means for providing fluid pressure communication between said power chamber and first and second zones of a well; and pressure transfer control means for using a pressure differential between said first and second zones of said well as a power source to said power chamber.
Claim 6
Dependent Claim
42 words
The apparatus of claim 3, further comprising: a power piston slidably disposed in said power chamber; and wherein said pressure transfer control means is further characterized as being a means for moving said power piston through an unlimited number of operating strokes.
Claim 7
Dependent Claim
28 words
The apparatus of claim 3, wherein: said pressure transfer control means is further characterized as being responsive to command signals transmitted from a surface location adjacent said well.
Claim 8
Dependent Claim
17 words
The apparatus of claim 3, further comprising: a rotating power transfer element disposed in said power chamber.
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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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |