GB686530A - Improvements in apparatus for perforating well casing - Google Patents
Improvements in apparatus for perforating well casingInfo
- Publication number
- GB686530A GB686530A GB140649A GB140649A GB686530A GB 686530 A GB686530 A GB 686530A GB 140649 A GB140649 A GB 140649A GB 140649 A GB140649 A GB 140649A GB 686530 A GB686530 A GB 686530A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fuze
- chamber
- switch
- charges
- charge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002360 explosive Substances 0.000 abstract 3
- 238000007789 sealing Methods 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 2
- HZTVIZREFBBQMG-UHFFFAOYSA-N 2-methyl-1,3,5-trinitrobenzene;[3-nitrooxy-2,2-bis(nitrooxymethyl)propyl] nitrate Chemical compound CC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O.[O-][N+](=O)OCC(CO[N+]([O-])=O)(CO[N+]([O-])=O)CO[N+]([O-])=O HZTVIZREFBBQMG-UHFFFAOYSA-N 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- 238000005474 detonation Methods 0.000 abstract 1
- 238000005429 filling process Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000002706 hydrostatic effect Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 230000002028 premature Effects 0.000 abstract 1
- 238000011160 research Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/117—Shaped-charge perforators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/02—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/08—Blasting cartridges, i.e. case and explosive with cavities in the charge, e.g. hollow-charge blasting cartridges
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Primary Cells (AREA)
Abstract
686,530. Apparatus for perforating well casings by means of explosives. GULF RESEARCH & DEVELOPMENT CO. Jan. 18, 1949. No. 1406/49. Class 9(i) [Also in Group XXII] A well-boring apparatus comprises a hollow sealed housing with means for positioning the housing in the well, at least one cavity charge being mounted within the housing so that the housing forms an expansion chamber partly or wholly surrounding the charge or charges, means being provided for detonating the charge. Fig. 15 shows a steel cylinder 101 with openings 102 leading to cavity high explosive charges 115, each cavity having a liner 111 attached to a container 110 for the charge. In each opening is welded a ring 103 grooved to receive a split lock-ring 105 holding a metal cap 107 in place to prevent well fluids entering the apparatus. The inner end of the container 110 is closed by a screw-threaded cap 112 through which passes a fuze-cord 114 joined to a main fuze-cord 117 extending upwards through a member 119 biased upwards by a spring 120 bearing against a supporting member 122. The spring tends to force the conical end 123 of the member 119 into the socket of a fuze-chamber 125 and the fuze 117 is held by a pin 127. In the fuze-chamber is an electrically actuated detonator 30 having one lead grounded to the wall of the chamber while the other is connected to a clock mechanism 132 and a switch 133. The terminals of a battery 134 are connected to the clock mechanism and the fuze-chamber respectively. The fuze-chamber 125 is screw-threaded into an end piece 136 sealing the uper end of the cylinder 101. In the end piece 136 is a pressure-sensitive switch 138 connected to a metallic ring 139 insulated from the end piece and in electrical contact with the switch 133. The lower end of the cylinder-is sealed by an end piece 14 and the apparatus is lowered into a well-bore by a line 142. The charges 115 may be 50-50 pentolite cast or pressed into the containers 110, a length of primacord 114 being embedded in the charge during the filling process. To prevent loss of explosive by melting, packing material 116 such as putty may be placed within the cap 112 closing the container 110. Premature detonation is prevented since the contact 146 and hence the detonator is grounded while the fuze-chamber is not attached to the end piece 136. When the fuze-chamber is threaded into the end-piece another grounding circuit is completed through the bush 141, the ring 139 and the switch 138. The grounding circuit remains closed until the apparatus is lowered to a pre-determined depth when the hydrostatic pressure opens the switch 138. The clock mechanism connects the battery 134 to the detonator for a short interval and if the detonator fails to fire, the clock breaks the connection so that the apparatus can be safely withdrawn, the switch 138 again closing as the pressure falls. In a modification, Fig. 16, the cylinder is of expendable material such as wood, or cement, provided with pockets for the shaped charges. A cylindrical block 201 has an axially arranged cavity 203 at one end forming the fuze chamber from which extends an axial bore 205 accommodating a fuze cord, e.g. primacord. Cavities are drilled diametrically through the block to house the charges, which may be arranged helically around the axis or with several cavities in any given horizontal plane and any desired vertical separation between the planes. Each cavity has a part cylindrical section 225 and a part conical section 207 expanding from the first section. Into the section 207 extends a liner 212 over which is a sealing disc 214, a second sealing disc 216 being placed at the entrance to the section 225. A weight 219 is attached to the block to sink the apparatus. Specification 645,059 is referred to.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB842751A GB686581A (en) | 1949-01-18 | 1949-01-18 | Improvements in apparatus for perforating well casing |
GB140649A GB686530A (en) | 1949-01-18 | 1949-01-18 | Improvements in apparatus for perforating well casing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB140649A GB686530A (en) | 1949-01-18 | 1949-01-18 | Improvements in apparatus for perforating well casing |
Publications (1)
Publication Number | Publication Date |
---|---|
GB686530A true GB686530A (en) | 1953-01-28 |
Family
ID=9721459
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB842751A Expired GB686581A (en) | 1949-01-18 | 1949-01-18 | Improvements in apparatus for perforating well casing |
GB140649A Expired GB686530A (en) | 1949-01-18 | 1949-01-18 | Improvements in apparatus for perforating well casing |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB842751A Expired GB686581A (en) | 1949-01-18 | 1949-01-18 | Improvements in apparatus for perforating well casing |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB686581A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2308177A (en) * | 1995-12-13 | 1997-06-18 | Western Atlas Int Inc | Shaped charges |
EP1062404A1 (en) * | 1998-03-13 | 2000-12-27 | Primex Technologies, Inc. | Expendable tubing-conveyed perforator |
US8347963B2 (en) | 2000-03-02 | 2013-01-08 | Schlumberger Technology Corporation | Controlling transient underbalance in a wellbore |
WO2015105739A1 (en) * | 2014-01-07 | 2015-07-16 | Shell Oil Company | Severance tool |
US11346184B2 (en) | 2018-07-31 | 2022-05-31 | Schlumberger Technology Corporation | Delayed drop assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2354309B (en) * | 1978-05-22 | 2001-07-04 | Hunting Eng Ltd | Explosive devices |
-
1949
- 1949-01-18 GB GB842751A patent/GB686581A/en not_active Expired
- 1949-01-18 GB GB140649A patent/GB686530A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2308177A (en) * | 1995-12-13 | 1997-06-18 | Western Atlas Int Inc | Shaped charges |
GB2308177B (en) * | 1995-12-13 | 1999-11-03 | Western Atlas Int Inc | Shaped charges |
EP1062404A1 (en) * | 1998-03-13 | 2000-12-27 | Primex Technologies, Inc. | Expendable tubing-conveyed perforator |
EP1062404A4 (en) * | 1998-03-13 | 2004-04-07 | Primex Tech Inc | Expendable tubing-conveyed perforator |
US8347963B2 (en) | 2000-03-02 | 2013-01-08 | Schlumberger Technology Corporation | Controlling transient underbalance in a wellbore |
WO2015105739A1 (en) * | 2014-01-07 | 2015-07-16 | Shell Oil Company | Severance tool |
US11346184B2 (en) | 2018-07-31 | 2022-05-31 | Schlumberger Technology Corporation | Delayed drop assembly |
Also Published As
Publication number | Publication date |
---|---|
GB686581A (en) | 1953-01-28 |
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