Patent US3661218A successfully refreshed from Google Patents.
US3661218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling unit for rotary drilling of wells
Assignee: Individual
•
Filing: 1970-05-21
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Granted: 1972-05-09
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Expires: 1990-05-21
Abstract
Abstract A drilling unit for rotary drilling of wells using casing as the drill string. The drilling unit is a self-contained assembly designed to be bodily inserted and withdrawn through the bore of a well casing string and comprises releasable latch means for non-rotatively locking the structure to the casing; a rotary power unit supported by the latch means and rotatively connected to a bit assembly. The latter comprises a main or pilot bit and a plurality of radially extendible and retractable underreamers actuated by fluid pressure which may first be employed for driving the power unit.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:27
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/20; E21B7/208; E21B10/00; E21B10/26; E21B10/32; E21B10/34; E21B10/345; E21B10/64; E21B4/00; E21B4/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
In the rotary drilling of wells, the combination of: a. a string of well casing; b. a drilling assembly constructed and arranged to be bodily inserted and removed through the bore of said well casing; said assembly comprising: i. anchor means for releasably securing said drilling assembly to the lower end portion of said casing and against rotation relative thereto, including; i1. a landing shoe carried by the lower end of the casing and having an annular recess circumferentially about the inner wall thereof; i2. a tubular cage slidably receivable in saId shoe; i3. anchor dogs mounted in the wall of said cage for radial movement into and out of said recess; i4. a setting sleeve slidably mounted in the bore of said cage for movement between position actuating and releasing said anchor dogs; and i5. means initially securing said setting sleeve in the dogreleasing position and releasable for movement to the dogactuating position by application of downward jarring force to said sleeve; ii. a rotary drive member secured to said anchor means; and iii. a pilot bit and underreamer assembly secured to said drive member for rotation thereby.
Claim 2
Dependent Claim
189 words
In the rotary drilling of wells, the combination of: a. a string of well casing; b. a drilling assembly constructed and arranged to be bodily inserted and removed through the bore of said well casing; said assembly comprising: i. anchor means for releasably securing said drilling assembly to the lower end portion of said casing and against rotation relative thereto, including; i1. a landing shoe carried by the lower end of the casing and having an annular recess circumferentially about the inner wall thereof; i2. a tubular cage slidably receivable in saId shoe; i3. anchor dogs mounted in the wall of said cage for radial movement into and out of said recess; i4. a setting sleeve slidably mounted in the bore of said cage for movement between position actuating and releasing said anchor dogs; and i5. means initially securing said setting sleeve in the dogreleasing position and releasable for movement to the dogactuating position by application of downward jarring force to said sleeve; ii. a rotary drive member secured to said anchor means; and iii. a pilot bit and underreamer assembly secured to said drive member for rotation thereby.
Claim 3
Dependent Claim
60 words
The combination of claim 1 wherein said anchor means includes: a. landing pins projecting inwardly from the inner wall of said shoe below said recess; and b. landing slots in the exterior of said cage positioned to receive said landing pins to limit relative downward movement of said cage and to hold said cage against rotation relative to said shoe.
Claim 4
Dependent Claim
13 words
The combination of claim 1 wherein said rotary drive member is fluid pressure-operated.
Claim 5
Dependent Claim
84 words
The combination of claim 1 wherein said pilot bit and underreamer assembly comprises: a. a tubular body connectible to the lower end of said drive member; b. a pilot bit carried by the lower end of said body; c. a plurality of angularly spaced underreamers pivotally mounted to the body above the pilot bit for radial extension and retraction; d. actuating means mounted in said body normally biasing said underreamers to extended position; and e. releasable means initially securing said underreamers in retracted positions.
Claim 6
Dependent Claim
33 words
The combination of claim 4 wherein: a. said rotary drive member is operated by fluid pressure applied through said casing; and b. release of said releasable means is effected by said fluid pressure.
Claim 7
Dependent Claim
43 words
The combination of claim 4 wherein said actuating means includes: a. plunger means slidably mounted in said body; b. crank means operably connecting said plunger means to said underreamers; and c. coil spring means mounted in downwardly biasing relation to said plunger means.
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |