Patent US5052502A successfully refreshed from Google Patents.
US5052502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for directional coring
Assignee: Baker Hughes Holdings LLC
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Filing: 1991-02-25
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Granted: 1991-10-01
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Expires: 2011-02-25
Abstract
Abstract The present invention comprises a novel method and apparatus for sinking drill holes in underground rock formations while generating drill cores as rock samples. More particularly, the present invention discloses a method and apparatus which allows for an expanded analysis of ground formations over a larger area through the extraction of drill cores as rock samples. The method and apparatus herein disclosed allows one to drill a number of core shaft sections from the base of a main shaft section in various directions in order to obtain a number of sample cores.
Inventors
- 👤 Rainer Jurgens
- 👤 Johann van Es
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:55
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/16; E21B25/02; E21B25/04; E21B4/00; E21B4/02; E21B7/00; E21B7/04; E21B7/06; E21B7/061; E21B7/068
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
A core drilling tool for sinking drill holes in underground rock formations while generating drilled cores as rock samples comprising a tubular walled outer housing with a main axis and including an upper and a lower end, and which is connectable at its upper end with a drill string and has on its lower end a main drill bit, and a core drilling unit including a deep hole motor, said motor being braced in said outer housing and liftable out of said outer housing, said core drilling unit also liftable out of said outer housing and including an upper part secured in said outer housing by a non-rotating guide device and a lower part, including a core tube driven by the deep hole motor, a core drilling bit, and a freely rotating inner tube mounted within said core tube, the lower end of said outer housing including a guide element with a guide surface which defines a guide axis for said core tube, said guide axis defining an acute angle with respect to the main axis of the outer housing.
Claim 2
Dependent Claim
180 words
A core drilling tool for sinking drill holes in underground rock formations while generating drilled cores as rock samples comprising a tubular walled outer housing with a main axis and including an upper and a lower end, and which is connectable at its upper end with a drill string and has on its lower end a main drill bit, and a core drilling unit including a deep hole motor, said motor being braced in said outer housing and liftable out of said outer housing, said core drilling unit also liftable out of said outer housing and including an upper part secured in said outer housing by a non-rotating guide device and a lower part, including a core tube driven by the deep hole motor, a core drilling bit, and a freely rotating inner tube mounted within said core tube, the lower end of said outer housing including a guide element with a guide surface which defines a guide axis for said core tube, said guide axis defining an acute angle with respect to the main axis of the outer housing.
Claim 3
Dependent Claim
25 words
The core drilling tool of claim 1 wherein the guide element is designed as an outer cylindrical tube which is secured within the outer housing.
Claim 4
Dependent Claim
29 words
The core drilling tool of claim 1 wherein the guide element is designed as an outer cylindrical tube and is a component of the wall of the outer housing.
Claim 5
Dependent Claim
45 words
The core drilling tool of claim 2 wherein the guide element is designed as liftable and insertable into the outer housing, said guide element being non-rotatably secured in the outer housing only when said guide element is in its operating position within said outer housing.
Claim 6
Dependent Claim
42 words
The core drilling tool of claim 2 wherein the guide element and the non-rotating guide for the upper part of the core drilling unit are combined into a unit which is hoistable and lowerable to its operating position in the outer housing.
Claim 7
Dependent Claim
30 words
The core drilling tool of claim 1 wherein the guide element includes a sloped, cylindrical guide surface forming a guide hole and a funnel-like upper inlet to said guide surface.
Claim 8
Dependent Claim
74 words
The core drilling apparatus of claim 1 further comprising a guide spindle which can be lifted or lowered into its operating position in the outer housing and which includes an upper support section which can be inserted into the non-rotating guide device of said outer housing and a spindle section including a pilot point extending downward through the guide element and connected to the upper support section by means of a flexible intermediate connector.
Claim 9
Dependent Claim
110 words
The core drilling tool of claim 1 further comprising a finishing drill tool which can be lifted or lowered into its operating position in the outer housing and which includes an upper, tubular support housing section with a deep hole motor, said upper section meshing in its operating position with the non-rotating guide device of the outer housing and further including a lower bearing housing section, said lower section meshing in its operating position with the guide element and including a finishing drill bit protruding from within said guide element, and further including a flexible interim housing section between the upper support housing section and the lower bearing housing section.
Claim 10
Dependent Claim
26 words
The core drilling tool of claim 1 wherein said non-rotating guide device is of a two-part design including a non-rotating section and a separate guide section.
Claim 11
Dependent Claim
58 words
The core drilling tool of claim 9 wherein the upper part of the core drilling unit includes an upwardly open, tubular housing comprised of anti-magnetic material which, in its operating position, meshes with the non-rotating section of the two-part non-rotating guide device, said open housing designed as a holder for a separate hoistable and lowerable orientation controlling unit.
Claim 12
Dependent Claim
64 words
The core drilling tool of claim 10 wherein said deep hole motor is comprised of a stator and a rotor, said rotor being rotatably seated through a tubular extension against the upper part of the core drilling unit while said stator is non-rotatably secured within said outer housing by means of said open, tubular housing of the upper part of the core drilling unit.
Claim 13
Dependent Claim
36 words
The core drilling tool of claim 11 wherein said tubular extension is connected by a flexible intermediate pipe section to said core tube and the stator is connected to the inner tube by a flexible connector.
Claim 14
Dependent Claim
75 words
The core drilling tool of claim 1 further comprising a separate valve unit hoistable and lowerable into its operating position within said outer housing, said valve unit being braced, when in its operating position, within said outer housing, said valve unit blocking drill mud flow through said core drilling unit whenever a specified distance from the main drill bit to the core drilling bit is reached during the after-drilling of a main drill hole section.
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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) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |