Ammunition and explosives – Blasting – Borehole loading
Patent
1996-07-23
2000-04-25
Nelson, Peter A.
Ammunition and explosives
Blasting
Borehole loading
102312, 175 454, F42B 300
Patent
active
060531118
ABSTRACT:
The present invention is an explosive device for use in a subterranean well, the downhole portion of the well being at a higher temperature than the surface, the explosive device comprising an explosive, an electrically conductive circuit capable of supplying electricity that can fire the explosive, and, a thermal switch electrically connected in the circuit, the thermal switch being switchable from open to close as the temperature of the thermal switch is changed from the temperature on the surface to the temperature in the downhole portion, the thermal switch being set such that the explosive cannot be electrically fired until the switch is at the downhole temperature.
The thermal switch may operate in either of two ways. In one embodiment, the thermal switch is connected in series in the electrical circuit, and is open at the surface temperature, thereby acting as a break in the electrical continuity of the circuit and preventing electricity from reaching the explosive. In an alternate embodiment, the thermal switch is connected across the circuit and is closed at the surface temperature, thereby acting as a shunt and preventing electricity in the circuit from reaching the explosive. Once either type of switch is heated sufficiently (as when the tool is run into the hole, and is heated by the higher temperatures downhole), the switch changes position and the explosive device is rendered capable of firing. Either embodiment can be used with a variety of explosive devices and wiring configurations, utilizing a range of explosion initiation devices.
REFERENCES:
patent: 4084147 (1978-04-01), Mlyniec et al.
patent: 4306628 (1981-12-01), Adams, Jr. et al.
patent: 4619320 (1986-10-01), Adynana et al.
patent: 4640354 (1987-02-01), Boisson
patent: 5159145 (1992-10-01), Carissella et al.
patent: 5346014 (1994-09-01), Ross
patent: 5392860 (1995-02-01), Ross
"High Temperature Resistant, Fluid Disabled, DF-Safe Electronic Detonator Dynawell 0015 FDE", Technical Data Sheet by Dynamit Nobel, 2 pgs, 1994.
"Safe-T-Shot EFI Initiation System", Technical Data Sheet by Magnavox Electronic Systems Company, 2 pgs, undated.
Schlumberger Wireline & Testing, Technical Data Sheet of "Slapper-Actuated Firing Equipment System", Schlumberger, 4 pgs., 1992.
"Safe Operating System", 5 pg. pamphlet, Teledyne Ryan Aeronautical, 5 pgs. undated.
"Wireline EFI Initiation System", Wayne A. Beck, Teledyne Ryan Aeronautical Selph Ordnance Unit, 9 pgs, undated.
"RISI Technical Topics", Technical Data Sheet of FS-20B Capacitor Discharge Unit, RISI, 3 pgs., Aug. 1993.
"Safe Modular Arming Technique (SMART)", pamphlet, 6 pgs, Western Atlas International, Inc., Apr. 1992.
"Three New Systems That Prevent Firing of Perforating Guns and String Shots On or Near the Surface", SPE 22556, J.V. Carisella, R.B. Cook and J.E. Beardmore, Jr., pp. 1-13, 1991.
Halliburton Energy Service,s Inc.
Nelson Peter A.
LandOfFree
Surface safe rig environment detonator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface safe rig environment detonator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface safe rig environment detonator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-984881