US3750423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borehole shock absorber
Assignee: Dresser Industries Inc
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Filing: 1972-06-28
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Granted: 1973-08-07
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Expires: 1992-06-28
Abstract
Abstract Disclosed herein is an improved borehole shock absorber for use between down hole well tools such as between a hydraulic pump and packer to absorb the shock loading created by the pump and, thereby, avoid damage to the packer. The shock absorber includes at least two relatively moveable members, one of which is connected to the packer and one to the pump with a shock absorbing material located therebetween arranged to absorb the shock created by the pump. One of the members is to be provided with a plurality of circumferentially spaced, elongated slots. The slots are located in the member adjacent the rubber so that when the shock absorbing material has been loaded, deformation in the slotted member can occur to permit additional deformation of the rubber and absorb shocks of a magnitude beyond the normal loading.
Inventors
- 👤 R Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:44
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
An improved borehole shock absorber for use between a first tool creating a shock loading and a second tool that is relatively fixed in a well bore or the like, said shock absorber comprising: means forming a variable volume annular space, said means including first and second elongated members concentrically arranged and moveable relative to each other to change the volume of said annular space, each said member being arranged for connection with one of the first and second tools, and one of said members including a plurality of circumferentially spaced slots extending through and longitudinally thereof increasing the flexibility of said one member; and, annular rubber means disposed in and partially filling said annular space adjacent said slots, said rubber means engaging both said members, whereby a decrease in volume in said annular space as a result of said shock loading deforms said rubber means to fill said annular space and a further decrease in volume deforms said rubber means and said one member between said slots.
Claim 2
Dependent Claim
168 words
An improved borehole shock absorber for use between a first tool creating a shock loading and a second tool that is relatively fixed in a well bore or the like, said shock absorber comprising: means forming a variable volume annular space, said means including first and second elongated members concentrically arranged and moveable relative to each other to change the volume of said annular space, each said member being arranged for connection with one of the first and second tools, and one of said members including a plurality of circumferentially spaced slots extending through and longitudinally thereof increasing the flexibility of said one member; and, annular rubber means disposed in and partially filling said annular space adjacent said slots, said rubber means engaging both said members, whereby a decrease in volume in said annular space as a result of said shock loading deforms said rubber means to fill said annular space and a further decrease in volume deforms said rubber means and said one member between said slots.
Claim 3
Dependent Claim
78 words
The improved borehole shock absorber of claim 1 wherein: said means forming said variable volume annular space also includes a third elongated member disposed within said pair of elongated members; said first elongated member being connected to said third elongated member at one end and arranged for connection with the first tool; and, said second elongated member being slidingly disposed between said first and third elongated members and arranged at one end fOr connection with the second tool.
Claim 4
Dependent Claim
18 words
The improved borehole shock absorber of claim 2 wherein said slots are formed in said first elongated member.
Claim 5
Dependent Claim
18 words
The improved borehole shock absorber of claim 2 wherein said slots are formed in said third elongated member.
Claim 6
Dependent Claim
32 words
The improved borehole shock absorber of claim 2 and also including means disposed between and engaging said second and third elongated member for preventing relative rotation therebetween while permitting relative longitudinal movement.
Claim 7
Dependent Claim
86 words
The improved borehole shock absorber of claim 1 wherein: said first elongated member is arranged for connection with the first tool and includes an inwardly extending flange disposed adjacent said second elongated member; said second elongated member is slidingly disposed with respect to said first elongated member and includes an outwardly extending flange disposed adjacent said first elonGated member and arranged for connection with the second tool; and, said rubber means being located between said flanges and engageable therewith upon relative movement between said elongated members.
Claim 8
Dependent Claim
18 words
The improved borehole shock absorber of claim 6 wherein said slots are formed in said first elongated member.
Claim 9
Dependent Claim
18 words
The improved borehole shock absorber of claim 6 wherein said slots are formed in said second elongated member.
Claim 10
Dependent Claim
32 words
The improved borehole shock absorber of claim 6 and also including means disposed between and engaging said first and second elongated members for preventing relative rotation therebetween while permitting relative longitudinal movement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |