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US3601196A Expired / Lapsed US ⏱️ 0.0 years remaining

Remote perforating in dual completion wells

Assignee: ExxonMobil Upstream Research Co
•
Filing: 1969-06-27
•
Granted: 1971-08-24
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Expires: 1989-06-27
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Abstract

Abstract Method for perforating in a dual, parallel pipe string tubingless well. A crossover passage or port connects these pipe strings. Each pipe string is provided with a landing nipple at about the same depth below the crossover port. A radioactive source tool, which includes a radioactive pill for transmitting radiation in angular directions and a seating member for seating the radioactive source tool in the landing nipple arranged in one of the pipe strings, is pumped through the one pipe string until the seating member is landed in the landing nipple. The radioactive pill is suspended from the seating member a predetermined distance which is approximately the level at which it is desired to perforate. A perforating assembly, which includes a directional perforating gun, a directional radiation detector, a radioactivity-sensitive gun-firing mechanism including a source of electrical power for causing actuation of the perforating gun, a rotation device for causing the perforating gun to rotate, a seating member for seating the perforating assembly in the landing nipple arranged in the other pipe string, and a locomotive device for moving the perforating assembly through the other pipe string, is then pumped through the other pipe string until the seating member lands in the landing nipple. The detector of the perforating assembly is suspended a predetermined distance from the seating member so that it is positioned at the same level as the radioactive pill in the adjacent pipe string. The firing mechanism utilizes a switch which is actuated when the radioactive count detected by the radiation detector reaches a predetermined level. The directional gun is aimed so as to fire in a predetermined angular direction when the directional detector is facing the radioactive pill. The perforating assembly is rotated by circulating fluid in the pipe strings. After the perforating gun has fired, the perforating assembly is removed from the other pipe string. The radioactive source tool is then removed from the one pipe string. The perforating gun may be reloaded and the perforating procedure repeated at a different level in the well bore after repositioning the radioactive source tool and perforating assembly.

Inventors

  • 👤 Thomas W Childers
  • 👤 Carl E Reistle

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 21:27
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/119; E21B23/00; E21B23/08

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 248 words
A method for perforating in a tubingless TFL well containing two spaced apart, parallel pipe strings comprising: launching a radioactive source into one of said pipe strings; pumping said radioactive source through said one pipe string to adjacent a level therein at which it is desired to perforate; launching into said other pipe string a perforating tool provided with a perforating gun having a selected direction of perforation, a detector of radiation having a selected direction of radiation detection relative to said direction of perforation, means for rotating said perforating gun when said perforating tool is caused to move by hydraulic pressure, a locomotive device for causing said perforating tool to move through and in said other pipe string by hydraulic pressure, a radioactivity-sensitive firing mechanism including a source of electrical power for actuating said perforating gun, and a switch actuatable when the radioactive count detected by said radiation detector reaches a predetermined level; pumping said perforating tool through said other pipe string until the radiation detector is at the level of said radiation pill; and moving said perforating tool by circulation of fluid through said pipe strings to cause the perforating gun to rotate until at one angular position of said perforating gun the detected radiation by said radiation detector reaches a preselected level to indicate that the direction of detection of radiation is toward said radioactive pill and said direction of perforation is in a selected direction, said perforating gun automatically firing when in such position.
Claim 2
Independent Claim 248 words
A method for perforating in a tubingless TFL well containing two spaced apart, parallel pipe strings comprising: launching a radioactive source into one of said pipe strings; pumping said radioactive source through said one pipe string to adjacent a level therein at which it is desired to perforate; launching into said other pipe string a perforating tool provided with a perforating gun having a selected direction of perforation, a detector of radiation having a selected direction of radiation detection relative to said direction of perforation, means for rotating said perforating gun when said perforating tool is caused to move by hydraulic pressure, a locomotive device for causing said perforating tool to move through and in said other pipe string by hydraulic pressure, a radioactivity-sensitive firing mechanism including a source of electrical power for actuating said perforating gun, and a switch actuatable when the radioactive count detected by said radiation detector reaches a predetermined level; pumping said perforating tool through said other pipe string until the radiation detector is at the level of said radiation pill; and moving said perforating tool by circulation of fluid through said pipe strings to cause the perforating gun to rotate until at one angular position of said perforating gun the detected radiation by said radiation detector reaches a preselected level to indicate that the direction of detection of radiation is toward said radioactive pill and said direction of perforation is in a selected direction, said perforating gun automatically firing when in such position.
Claim 3
Dependent Claim 20 words
A method as recited in claim 1 in which said direction of perforation is away from said one pipe string.
Claim 4
Dependent Claim 19 words
A method as recited in claim 1 in which said direction of perforation is toward said oNe pipe string.
Claim 5
Dependent Claim 32 words
A method as recited in claim 1 in which said perforating gun automatically firing when in said one angular position when well pressure adjacent said perforating tool is at a predetermined level.
Claim 6
Dependent Claim 36 words
A method as recited in claim 4 in which movement of said perforating tool by circulation of fluid to cause the perforating gun to rotate also actuates a switch to permit said perforating gun to fire.
Claim 7
Dependent Claim 28 words
A method as recited in claim 1 including the step of reverse circulating said perforating gun out of said other pipe string after firing of said perforating gun.
Claim 8
Dependent Claim 21 words
A method as recited in claim 6 wherein said perforating tool is moved upwardly to cause said perforating gun to rotate.
Claim 9
Dependent Claim 22 words
A method as recited in claim 6 including moving said perforating tool upwardly and downwardly to cause said perforating gun to rotate.
Claim 10
Dependent Claim 148 words
Apparatus for perforating in a tubingless TFL well containing two spaced apart, parallel pipe strings connected together through a crossover port comprising: a pumpable perforating tool adapted to be pumped into and out of one of said pipe strings and provided with a perforating gun having a selected angular direction of perforation and a detector having a selected angular direction of radiation detection relative to said direction of perforation, locomotive means for causing said perforating tool to move vertically in one of said pipe strings when acted upon by hydraulic pressure, rotating means for rotating said perforating tool when said perforating tool is moved vertically in said one pipe string by hydraulic pressure, and means for automatically firing said perforating gun when the level of radiation detected is at a preselected value; and a radiation source adapted to be pumped into and out of said other pipe string.
Claim 11
Dependent Claim 148 words
Apparatus for perforating in a tubingless TFL well containing two spaced apart, parallel pipe strings connected together through a crossover port comprising: a pumpable perforating tool adapted to be pumped into and out of one of said pipe strings and provided with a perforating gun having a selected angular direction of perforation and a detector having a selected angular direction of radiation detection relative to said direction of perforation, locomotive means for causing said perforating tool to move vertically in one of said pipe strings when acted upon by hydraulic pressure, rotating means for rotating said perforating tool when said perforating tool is moved vertically in said one pipe string by hydraulic pressure, and means for automatically firing said perforating gun when the level of radiation detected is at a preselected value; and a radiation source adapted to be pumped into and out of said other pipe string.
Claim 12
Dependent Claim 39 words
Apparatus as recited in claim 9 including means arranged on said perforating tool adapted to prevent firing of said perforating gun until a predetermined pressure is reached in said one pipe string at the level of said perforating tool.

References Cited (Backward Citations)

US3032107A Cited
US3426851A Cited
US3294163A Cited
US3097693A Cited
US3208533A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-08-23 1975-02-22 1975-08-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-08-23 1979-02-22 1979-08-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-08-23 1983-02-22 1983-08-24 $7700.00 Window Closed / Lapsed

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