US3939927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined gravel packing and perforating method and apparatus for use in well bores
Assignee: Western Atlas International Inc
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Filing: 1974-11-04
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Granted: 1976-02-24
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Expires: 1994-11-04
Abstract
Abstract A well tool apparatus having a perforating section at its lower end has an upper section comprised of a reservoir containing a compatible perforating fluid and a pump for pumping such fluid down through the perforating section and out the lower end of the apparatus. A protective shield containing a sand control medium is provided for causing the perforating fluid to displace the well bore fluid in the region along the length of the perforating section, such displaced fluid being recaptured above a floating piston in the reservoir containing the perforating fluid. Means are provided for releasing the compatible perforating fluid into the annulus between the shield and the perforating section, the lower end of the shield having a gravel screen and a port for releasing the perforating fluid into the annulus between the apparatus and the casing to be perforated. Upon perforating, the sand control medium settles into place inside the shield to provide sand control for the formation being produced.
Inventors
- 👤 Floyd O. Bohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:37
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/02; E21B43/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
An apparatus for perforating casing in an earth borehole, comprising: an elongated instrument adapted to traverse said borehole; a perforating section carried by, and being a portion of, said instrument, said perforating section having at least one perforating element therein; and an enclosure having a gravel pack medium therein carried by said instrument and positioned in the line of fire of said at least one perforating element, whereby the activation of said at least one perforating element causes at least a portion of said perforating element to perforate said gravel pack medium prior to perforating said casing.
Claim 2
Independent Claim
97 words
An apparatus for perforating casing in an earth borehole, comprising: an elongated instrument adapted to traverse said borehole; a perforating section carried by, and being a portion of, said instrument, said perforating section having at least one perforating element therein; and an enclosure having a gravel pack medium therein carried by said instrument and positioned in the line of fire of said at least one perforating element, whereby the activation of said at least one perforating element causes at least a portion of said perforating element to perforate said gravel pack medium prior to perforating said casing.
Claim 3
Independent Claim
107 words
An apparatus attached to a string of oil well tubing for perforating casing in an earth borehole and for producing fluids through said tubing on the same trip, comprising: an elongated instrument adapted to traverse said borehole; a perforating section carried by, and being a portion of, said instrument, said perforating section having at least one perforating element therein; an enclosure having a gravel pack medium therein carried by said instrument; and channel means including said gravel pack medium and the interior of said tubing string and which is in fluid communication with fluids in the borehole following the activation of said at least one perforating element.
Claim 4
Independent Claim
107 words
An apparatus attached to a string of oil well tubing for perforating casing in an earth borehole and for producing fluids through said tubing on the same trip, comprising: an elongated instrument adapted to traverse said borehole; a perforating section carried by, and being a portion of, said instrument, said perforating section having at least one perforating element therein; an enclosure having a gravel pack medium therein carried by said instrument; and channel means including said gravel pack medium and the interior of said tubing string and which is in fluid communication with fluids in the borehole following the activation of said at least one perforating element.
Claim 5
Independent Claim
171 words
An apparatus for perforating casing in an earth borehole, comprising: an elongated instrument adapted to traverse said borehole; a reservoir within said instrument; a piston within said reservoir dividing said reservoir into an upper section and a lower section, said upper section having at least one intake port for receiving borehole fluids, and said lower section having at least one outlet port for releasing any fluid in said lower section; a cylindrical perforating section connected to the lower end of said instrument having a plurality of perforating elements therein; a cylindrical, expendable shield encircling said perforating section to form an annulus between said shield and said perforating section, said formed annulus containing a sand control medium, said lower section outlet port being in communication with said formed annulus, said shield having at least one outlet port at a location at least to the lower extremity of said perforating elements for releasing fluid from said formed annulus into the annulus between said shield and said casing; and means for activating said piston.
Claim 6
Independent Claim
171 words
An apparatus for perforating casing in an earth borehole, comprising: an elongated instrument adapted to traverse said borehole; a reservoir within said instrument; a piston within said reservoir dividing said reservoir into an upper section and a lower section, said upper section having at least one intake port for receiving borehole fluids, and said lower section having at least one outlet port for releasing any fluid in said lower section; a cylindrical perforating section connected to the lower end of said instrument having a plurality of perforating elements therein; a cylindrical, expendable shield encircling said perforating section to form an annulus between said shield and said perforating section, said formed annulus containing a sand control medium, said lower section outlet port being in communication with said formed annulus, said shield having at least one outlet port at a location at least to the lower extremity of said perforating elements for releasing fluid from said formed annulus into the annulus between said shield and said casing; and means for activating said piston.
Claim 7
Dependent Claim
18 words
The apparatus according to claim 3 wherein said lower section of said reservoir contains a compatible perforating fluid.
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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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |