US3708013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for obtaining an improved gravel pack
Assignee: Mobil Oil AS
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Filing: 1971-05-03
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Granted: 1973-01-02
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Expires: 1991-05-03
Abstract
Abstract This specification discloses a process for providing a gravel pack adjacent a subsurface formation in a well having a string of casing therein. In carrying out this process, first perforations are formed through the casing adjacent the subsurface formation and materials are flowed therethrough to provide a consolidated gravel pack. Second perforations are thereafter formed through the casing to extend into and terminate within the consolidated gravel pack. Also disclosed is a well tool which may be employed in carrying out this process. This well tool is comprised in combination of an elongated body housing a means for forming perforations in casing in a well, which body has a recess in the lower end thereof. A plug is provided which is adapted to be set in the casing, which plug has fixed to the upper side thereof a protrusion that is adapted to be positively engaged by the recess.
Inventors
- 👤 N Dismukes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:48
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/04; E21B43/11; E21B43/119
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A method of providing a gravel pack in a well adjacent a subsurface formation, said well having a string of casing therein, comprising: forming first perforations through said casing adjacent said subsurface formation; flowing material through said first perforations to provide a consolidated gravel pack adjacent said subsurface formation; and forming second perforations through said casing, which second perforations extend into and terminate within said consolidated gravel pack.
Claim 2
Independent Claim
68 words
A method of providing a gravel pack in a well adjacent a subsurface formation, said well having a string of casing therein, comprising: forming first perforations through said casing adjacent said subsurface formation; flowing material through said first perforations to provide a consolidated gravel pack adjacent said subsurface formation; and forming second perforations through said casing, which second perforations extend into and terminate within said consolidated gravel pack.
Claim 3
Dependent Claim
19 words
The method of claim 1 further comprising sealing those first perforations located adjacent the upper portion of said pack.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said second perforations are formed through said first perforations in said casing.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein said second perforations are of a smaller size than said first perforations.
Claim 6
Independent Claim
103 words
A method of providing a gravel pack in a well adjacent a subsurface formation, said well having a string of casing therein, comprising: positioning in said well a perforation orientation plug below said zone to be perforated; positioning in said well a perforation tool in engagement with said perforation orientation plug; providing first perforations in said casing; flowing material through said first perforations to provide a consolidated gravel pack adjacent said subsurface formation; repositioning in said well said perforation tool in engagement with said perforation orientation plug; and providing second perforations extending through said first perforations and terminating within said consolidated gravel pack.
Claim 7
Independent Claim
103 words
A method of providing a gravel pack in a well adjacent a subsurface formation, said well having a string of casing therein, comprising: positioning in said well a perforation orientation plug below said zone to be perforated; positioning in said well a perforation tool in engagement with said perforation orientation plug; providing first perforations in said casing; flowing material through said first perforations to provide a consolidated gravel pack adjacent said subsurface formation; repositioning in said well said perforation tool in engagement with said perforation orientation plug; and providing second perforations extending through said first perforations and terminating within said consolidated gravel pack.
Claim 8
Independent Claim
153 words
A method of providing in a well a gravel pack adjacent a subsurface formation, said well having a string of casing therein, comprising: positioning in said well in fixed relationship to said casing a plug having an orientation protrusion fixed thereto and extending upward therefrom; positioning in said well a perforating tool having an orientation recess provided in the lower portion thereof, said recess engaging said orientation protrusion whereby said perforating tool is oriented in a fixed position with respect to said casing; forming first perforations through said casing; withdrawing said perforating tool from said well; flowing material through said first perforations to provide a consolidated gravel pack adjacent said subsurface formation; repositioning in said well said perforating tool and reorienting said perforating tool in said fixed position with respect to said casing; and forming second perforations which extend through said first perforations in said casing and terminate within said consolidated gravel pack.
Claim 9
Independent Claim
153 words
A method of providing in a well a gravel pack adjacent a subsurface formation, said well having a string of casing therein, comprising: positioning in said well in fixed relationship to said casing a plug having an orientation protrusion fixed thereto and extending upward therefrom; positioning in said well a perforating tool having an orientation recess provided in the lower portion thereof, said recess engaging said orientation protrusion whereby said perforating tool is oriented in a fixed position with respect to said casing; forming first perforations through said casing; withdrawing said perforating tool from said well; flowing material through said first perforations to provide a consolidated gravel pack adjacent said subsurface formation; repositioning in said well said perforating tool and reorienting said perforating tool in said fixed position with respect to said casing; and forming second perforations which extend through said first perforations in said casing and terminate within said consolidated gravel pack.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |