US3856094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for utilizing compatible perforating fluid in well bores
Assignee: Western Atlas International Inc
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Filing: 1973-11-01
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Granted: 1974-12-24
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Expires: 1993-11-01
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 tool. Means are 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. In an alternative embodiment, a protective shield is utilized around the perforating tool and means are provided for releasing the perforating fluid into the annulus between the shield and the perforating section, the lower end of the shield having a port for releasing the perforating fluid into the annulus between the instrument and the casing to be perforated.
Inventors
- 👤 M Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:32
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/119; E21B43/1195
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 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; a perforating section connected to the lower end of said instrument having a plurality of perforating elements therein, said perforating section having a fluid channel along its length at least to the lower extremity of said perforating elements, said fluid channel being in communication with the lower section of said reservoir and having at least one outlet port for releasing fluid from said lower section of said reservoir into the annulus between said lower perforating elements and said casing; and means for activating said piston.
Claim 2
Independent Claim
137 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; a perforating section connected to the lower end of said instrument having a plurality of perforating elements therein, said perforating section having a fluid channel along its length at least to the lower extremity of said perforating elements, said fluid channel being in communication with the lower section of said reservoir and having at least one outlet port for releasing fluid from said lower section of said reservoir into the annulus between said lower perforating elements and said casing; and means for activating said piston.
Claim 3
Independent Claim
137 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; a perforating section connected to the lower end of said instrument having a plurality of perforating elements therein, said perforating section having a fluid channel along its length at least to the lower extremity of said perforating elements, said fluid channel being in communication with the lower section of said reservoir and having at least one outlet port for releasing fluid from said lower section of said reservoir into the annulus between said lower perforating elements and said casing; and means for activating said piston.
Claim 4
Independent Claim
137 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; a perforating section connected to the lower end of said instrument having a plurality of perforating elements therein, said perforating section having a fluid channel along its length at least to the lower extremity of said perforating elements, said fluid channel being in communication with the lower section of said reservoir and having at least one outlet port for releasing fluid from said lower section of said reservoir into the annulus between said lower perforating elements and said casing; and means for activating said piston.
Claim 5
Independent Claim
163 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 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
163 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 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.
Claim 8
Dependent Claim
31 words
The apparatus according to claim 4 including in addition thereto means carried by said instrument for preventing any substantial flow of borehole fluid up past the upper section of said reservoir.
Claim 9
Independent Claim
176 words
An apparatus for perforating casing in an earth borehole, comprising: an elongated instrument adapted to traverse said borehole; first and second fluid reservoirs within said instrument, said first reservoir having at least an inlet port for receiving borehole fluids, and said second reservoir having at least one outlet port for releasing any fluid in said second reservoir; 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 second reservoir 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 causing any fluid in said second reservoir to be released out through said outlet port and to cause displaced well bore fluids to be pumped into said first reservoir.
Claim 10
Independent Claim
176 words
An apparatus for perforating casing in an earth borehole, comprising: an elongated instrument adapted to traverse said borehole; first and second fluid reservoirs within said instrument, said first reservoir having at least an inlet port for receiving borehole fluids, and said second reservoir having at least one outlet port for releasing any fluid in said second reservoir; 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 second reservoir 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 causing any fluid in said second reservoir to be released out through said outlet port and to cause displaced well bore fluids to be pumped into said first reservoir.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |