US3273660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for changing single drill pipe strings to
Assignee: —
•
Filing: —
•
Granted: 1966-09-20
•
Expires: 1983-09-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:48
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A METHOD FOR CHANGING FROM A SINGLE DRILL PIPE DRILLING SECTION TO A DUAL DRILL PIPE DRILLING SECTION COMPRISING THE STEPS OF INTRODUCING AN INNER DRILL PIPE SECTION INTO AN OUTER DRILL PIPE SECTION TO FORM A FLUID PASSAGE INSIDE THE INNER DRILL PIPE SECTION AND AN ANNULAR FLUID PASSAGE BETWEEN THE OUTER AND INNER DRILL PIPE SECTIONS, LOCATING AND EXPANDABLE COUPLING UNIT BETWEEN THE SECTIONS TO SEAL THE TWO FLUID PASSAGES FROM EACH OTHER AND ESTABLISH COMMUNICATION OF THE TWO RESPECTIVE FLUID PASSAGES WITH CORRESPONDING FLUID PASSAGES OF ADJACENT DRILL PIPE MEMBERS, AND FIRMLY POSITIONING THE INNER SECTION IN THE OUTER SECTION BY EXPANDING THE COUPLING UNIT.
Claim 2
Independent Claim
108 words
A METHOD FOR CHANGING FROM A SINGLE DRILL PIPE DRILLING SECTION TO A DUAL DRILL PIPE DRILLING SECTION COMPRISING THE STEPS OF INTRODUCING AN INNER DRILL PIPE SECTION INTO AN OUTER DRILL PIPE SECTION TO FORM A FLUID PASSAGE INSIDE THE INNER DRILL PIPE SECTION AND AN ANNULAR FLUID PASSAGE BETWEEN THE OUTER AND INNER DRILL PIPE SECTIONS, LOCATING AND EXPANDABLE COUPLING UNIT BETWEEN THE SECTIONS TO SEAL THE TWO FLUID PASSAGES FROM EACH OTHER AND ESTABLISH COMMUNICATION OF THE TWO RESPECTIVE FLUID PASSAGES WITH CORRESPONDING FLUID PASSAGES OF ADJACENT DRILL PIPE MEMBERS, AND FIRMLY POSITIONING THE INNER SECTION IN THE OUTER SECTION BY EXPANDING THE COUPLING UNIT.
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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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |