US3236308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus and method
Assignee: Richfield Oil Corp
•
Filing: 1960-04-04
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Granted: 1966-02-22
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 William D Leake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12; E21B7/128; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B41/00; E21B41/0007; E21B41/0014; E21B41/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A METHOD FOR DRILLING A WELL BORE IN THE OCEAN FLOOR FROM A DRILLING VESSEL CONNECTED TO AN APERTURED LANDING BASE ON THE OCEAN FLOOR BY A GUIDE LINE, COMPRISING THE STEPS; GUIDING A CONDUCTOR PIPE THROUGH SAID LANDING BASE AND INTO SAID WELL BORE WITH SAID GUIDE LINE, CONNECTING A STINGER AND A SURFACE CASING TO A SURFACE CASING RELEASE TOOL, GUIDING SAID CONNECTED STINGER AND SURFACE CASING FROM SAID VESSEL INTO SAID CONDUCTOR PIPE THROUGH SAID LANDING BASE APERTURE WITH SAID GUIDE LINE AND A DRILL PIPE CONNECTED TO SAID CASING RELEASE TOOL, INSERTING A LOWERING SUB BETWEEN SAID STRINGER AND SAID DRILL PIPE, LATCHING THE UPPER END OF A BLOWOUT PREVENTER TO SAID LOWERING SUB, GUIDING SAID BLOWOUT PREVENTER WITH SAID STINGER TO SAID BASE ON THE OCEAN FLOOR, RE-ENTERING SAID LANDING BASE APERTURE THROUGH SAID
Claim 2
Independent Claim
139 words
A METHOD FOR DRILLING A WELL BORE IN THE OCEAN FLOOR FROM A DRILLING VESSEL CONNECTED TO AN APERTURED LANDING BASE ON THE OCEAN FLOOR BY A GUIDE LINE, COMPRISING THE STEPS; GUIDING A CONDUCTOR PIPE THROUGH SAID LANDING BASE AND INTO SAID WELL BORE WITH SAID GUIDE LINE, CONNECTING A STINGER AND A SURFACE CASING TO A SURFACE CASING RELEASE TOOL, GUIDING SAID CONNECTED STINGER AND SURFACE CASING FROM SAID VESSEL INTO SAID CONDUCTOR PIPE THROUGH SAID LANDING BASE APERTURE WITH SAID GUIDE LINE AND A DRILL PIPE CONNECTED TO SAID CASING RELEASE TOOL, INSERTING A LOWERING SUB BETWEEN SAID STRINGER AND SAID DRILL PIPE, LATCHING THE UPPER END OF A BLOWOUT PREVENTER TO SAID LOWERING SUB, GUIDING SAID BLOWOUT PREVENTER WITH SAID STINGER TO SAID BASE ON THE OCEAN FLOOR, RE-ENTERING SAID LANDING BASE APERTURE THROUGH SAID
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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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |