US3874465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coring apparatus
Assignee: RANDOLPH CO
•
Filing: 1973-10-02
•
Granted: 1975-04-01
•
Expires: 1993-10-02
Abstract
Abstract A formation coring apparatus suitable for coring relatively soft formations which apparatus includes a core barrel with an interior surface having properties similar to synthetic rubber and two semitubular rigid portions joined along at least one of the adjacent edges by a flexible material, a core catcher having a plurality of flexible segments adapted to open while the core is being drilled and to close with the segments supporting the core thereabove to recover the core, a coring bit and a wire line tool adapted to carry the core barrel and the core catcher into position within the coring bit and having a fishing neck to be engaged by a wire line device for recovery, a latch for retaining the tool in position within the coring bit, a swivel allowing the core barrel and catcher to remain stationary while the coring bit is rotated and a check valve allowing fluid flow from the top of the core barrel because of the entry of the core therein to flow out the tool while preventing inflow of fluids into the top of the tool.
Inventors
- 👤 John Wallace Young
- 👤 Robert Charles Firkins
- 👤 Gregg Ring
- 👤 Jr John A Tatum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/06; E21B25/02; E21B25/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
51 words
A formation coring apparatus, comprising a tubular member having rigid semitubular members joined along at least one of their adjacent edges by a resilient, flexible material, said semitubular members being of a material on their inner surface suitable for supporting a loose core from a soft formation without damaging such core.
Claim 2
Dependent Claim
51 words
A formation coring apparatus, comprising a tubular member having rigid semitubular members joined along at least one of their adjacent edges by a resilient, flexible material, said semitubular members being of a material on their inner surface suitable for supporting a loose core from a soft formation without damaging such core.
Claim 3
Dependent Claim
41 words
A formation coring apparatus according to claim 1, including a catcher located beneath the lower extremity of said tubular member and being generally tubular in shape and having resilient core retaining means adapted to normally span the bore of said catcher.
Claim 4
Dependent Claim
14 words
A formation coring apparatus according to claim 1, wherein said semitubular members are metal.
Claim 5
Dependent Claim
17 words
A formation coring apparatus according to claim 1, wherein said semitubular members are a rigid plastic material.
Claim 6
Dependent Claim
43 words
A formation coring apparatus according to claim 1 wherein said tubular member is an extruded tube having axially extending, opposed sections of reduced thickness, said tubular member being of a material suitable as a lining for supporting a loose core without damage thereto.
Claim 7
Dependent Claim
182 words
A formation coring apparatus, comprising a core barrel having two semitubular members having their edges extending axially in close spaced relationship, means resiliently connecting at least one pair of adjacent edges of said semitubular members, means lining said core barrel to receive a core from a soft formation therein without damage thereto, a core catcher having a tubular body and resilient closure means adapted to open freely to admit a core from a soft formation therein from one direction and resiliently close to prevent a core from passing therethrough in the other direction, means for supporting said core barrel and said core catcher in aligned position, said supporting means including a tubular housing and a bull nose, a coring bit having a central bore, said supporting means adapted to be positioned within the central bore of said coring bit with said core catcher positioned within the lower portion of said central bit bore and said core barrel positioned on and extending above said core catcher whereby a core cut by said coring bit enters through said core catcher into said core barrel.
Claim 8
Dependent Claim
182 words
A formation coring apparatus, comprising a core barrel having two semitubular members having their edges extending axially in close spaced relationship, means resiliently connecting at least one pair of adjacent edges of said semitubular members, means lining said core barrel to receive a core from a soft formation therein without damage thereto, a core catcher having a tubular body and resilient closure means adapted to open freely to admit a core from a soft formation therein from one direction and resiliently close to prevent a core from passing therethrough in the other direction, means for supporting said core barrel and said core catcher in aligned position, said supporting means including a tubular housing and a bull nose, a coring bit having a central bore, said supporting means adapted to be positioned within the central bore of said coring bit with said core catcher positioned within the lower portion of said central bit bore and said core barrel positioned on and extending above said core catcher whereby a core cut by said coring bit enters through said core catcher into said core barrel.
Claim 9
Dependent Claim
24 words
A formation coring apparatus according to claim 6, wherein the clearance between said supporting means and the lower interior of said bit is minimized.
Claim 10
Dependent Claim
31 words
A formation coring apparatus according to claim 6, wherein the internal length of the core diameter portion of said bull nose and said coring bit is less than 1 1/2 inches.
Claim 11
Dependent Claim
21 words
A formation coring apparatus according to claim 6, including means connected to said supporting means for engagement by a wire line.
Claim 12
Dependent Claim
40 words
A formation coring apparatus according to claim 9 wherein said wire line engaging means includes a housing, and a latch within said housing and adapted to engage below a shoulder within said coring bit to retain said supporting means therein.
Claim 13
Dependent Claim
37 words
A formation coring apparatus according to claim 9 wherein said wire line engaging means includes a housing and, a check valve allowing flow upwardly out of said housing and said supporting means and preventing downward flow wherein.
Claim 14
Dependent Claim
52 words
A formation coring apparatus according to claim 9 wherein said wire line engaging means includes a housing, and a swivel connecting said housing to said supporting means so that as said housing rotates with said coring bit, said core barrel and said core catcher may receive a core without a rotarY motion.
Claim 15
Dependent Claim
107 words
In a formation coring apparatus having a core barrel, a core catcher comprising a tubular housing having a central bore, a plurality of flexible segments mounted in said housing, said segments being normally positioned to close the central core through said housing, and means coacting with said segments to restrain their movement in one direction to retain a core within the core barrel while allowing freedom of movement of the segments in the other direction so that a core being cut from a soft formation will flex the segments upwardly and outwardly to permit entry of the core into the core barrel without damage to the core.
Claim 16
Dependent Claim
107 words
In a formation coring apparatus having a core barrel, a core catcher comprising a tubular housing having a central bore, a plurality of flexible segments mounted in said housing, said segments being normally positioned to close the central core through said housing, and means coacting with said segments to restrain their movement in one direction to retain a core within the core barrel while allowing freedom of movement of the segments in the other direction so that a core being cut from a soft formation will flex the segments upwardly and outwardly to permit entry of the core into the core barrel without damage to the core.
Claim 17
Dependent Claim
33 words
In a coring apparatus a core catcher according to claim 13, wherein said segments in closed position form a cone having an apex pointing in the direction of free opening of said segments.
Claim 18
Dependent Claim
53 words
In a coring apparatus, a core catcher according to claim 14, including resilient ribs secured to said tubular housing and to the upper side of the cone of said segments with at least one of said ribs secured to each of said segments whereby said ribs provide said restraining means for said segments.
References Cited (Backward Citations)
US2083062A
Cited
US2189057A
Cited
US2258352A
Cited
US2315590A
Cited
US2876996A
Cited
US3092192A
Cited
US3103981A
Cited
US3180438A
Cited
US3285354A
Cited
US3409094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |