US4928760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Downhole coupon holder
Assignee: Chevron USA Inc
•
Filing: 1988-10-24
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Granted: 1990-05-29
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Expires: 2008-10-24
Abstract
Abstract An economical, corrosion-resistant, wireline set and retrievable, downhole coupon holder is disclosed that has a non-metallic, elongated member having recessed slots and a mounting means for mounting the coupons within the recessed slots. Preferably, there are six pairs of slots, with each pair of slots being on opposite sides of the elongated member. Each pair of slots shares a common mounting means that fixes the ends of coupons within that pair of slots.
Inventors
- 👤 Elizabeth A. Freitas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:38
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/01; E21B47/017; E21B41/00; E21B41/02; E21B47/006; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
34 words
An apparatus for holding elongated coupons within a wellbore comprising a non-metallic, elongated member having: a. longitudinally elongated recessed slots and b. mounting means for mounting said elongated coupons completely within said recessed slots.
Claim 2
Independent Claim
34 words
An apparatus for holding elongated coupons within a wellbore comprising a non-metallic, elongated member having: a. longitudinally elongated recessed slots and b. mounting means for mounting said elongated coupons completely within said recessed slots.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1 wherein said elongated member has an even number of recessed slots.
Claim 4
Dependent Claim
16 words
An apparatus according to claim 2 wherein said elongated member has at least twelve recessed slots.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 2 wherein said elongated member has pairs of recessed slots, with each pair of slots being on opposite sides of said elongated member.
Claim 6
Dependent Claim
27 words
An apparatus according to claim 4 wherein said pairs of slots share a common mounting means that fixes the ends of coupons within those pairs of slots.
Claim 7
Dependent Claim
26 words
An apparatus according to claim 1 wherein said apparatus further comprises an attaching means attached to said elongated member for attaching said member to running equipment.
Claim 8
Dependent Claim
23 words
An apparatus according to claim 6 wherein said attaching means is a top sub having both a fishing neck and integral wrench flats.
Claim 9
Independent Claim
93 words
An apparatus for holding coupons within a wellbore comprising a non-metallic, elongated member having: a. pairs of recessed slots, with each pair of slots being on opposite sides of said elongated member; and b. mounting means for mounting said coupons within said recessed slots; wherein said pairs of slots share a common mounting means that fixes the ends of coupons within those pairs of slots, and wherein said common mounting means are metallic bolts and nuts which form electrical connections for coupons within those pairs of slots for galvanic testing of said coupons.
Claim 10
Independent Claim
93 words
An apparatus for holding coupons within a wellbore comprising a non-metallic, elongated member having: a. pairs of recessed slots, with each pair of slots being on opposite sides of said elongated member; and b. mounting means for mounting said coupons within said recessed slots; wherein said pairs of slots share a common mounting means that fixes the ends of coupons within those pairs of slots, and wherein said common mounting means are metallic bolts and nuts which form electrical connections for coupons within those pairs of slots for galvanic testing of said coupons.
Claim 11
Independent Claim
91 words
An apparatus for holding coupons within a wellbore comprising a non-metallic, elongated member having: a. pairs of recessed slots, with each pair of slots being on opposite sides of said elongated member; and b. mounting means for mounting said coupons within said recessed slots; wherein said pairs of slots share a common mounting means that fixes the ends of coupons within those pairs of slots, and wherein said common mounting means are bolts and nuts which are insulated so as to prevent electrical grounding of coupons within those pairs of slots.
Claim 12
Independent Claim
91 words
An apparatus for holding coupons within a wellbore comprising a non-metallic, elongated member having: a. pairs of recessed slots, with each pair of slots being on opposite sides of said elongated member; and b. mounting means for mounting said coupons within said recessed slots; wherein said pairs of slots share a common mounting means that fixes the ends of coupons within those pairs of slots, and wherein said common mounting means are bolts and nuts which are insulated so as to prevent electrical grounding of coupons within those pairs of slots.
Claim 13
Independent Claim
42 words
An apparatus for holding coupons within a wellbore comprising a non-metallic, elongated member having: a. recessed slots, wherein said recessed slots contains a means for creating stress within said coupons, and b. mounting means for mounting said coupons within said recessed slots.
Claim 14
Independent Claim
42 words
An apparatus for holding coupons within a wellbore comprising a non-metallic, elongated member having: a. recessed slots, wherein said recessed slots contains a means for creating stress within said coupons, and b. mounting means for mounting said coupons within said recessed slots.
Claim 15
Dependent Claim
18 words
An apparatus according to claim 10 wherein said means for creating stress comprises screws coated with non-metallic material.
References Cited (Backward Citations)
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |