EP 0753096 A4 19990804 - CONTROLLED FRAGMENTATION OF HARD ROCK BY PRESSURIZATION OF THE BOTTOM OF A DRILL HOLE
Title (en)
CONTROLLED FRAGMENTATION OF HARD ROCK BY PRESSURIZATION OF THE BOTTOM OF A DRILL HOLE
Title (de)
VERFAHREN ZUM KONTROLLIERTEN BRECHEN VON GESTEIN MITTELS UNTERDRUCKSETZUNG DES BODENS EINES BOHRLOCHS
Title (fr)
FRACTURATION CONTROLEE DE ROCHES DURES PAR LA MISE SOUS PRESSION DU FOND D'UN TROU DE FORAGE
Publication
Application
Priority
US 9404135 W 19940414
Abstract (en)
[origin: CA2187750A1] A controlled-fracturing process is accomplished by pressurizing the bottom of a drill hole (6) in such a way as to initiate and propagate a controlled fracture (11) or propagate any pre-existing fractures. A cartridge (5) containing a non-detonating propellant charge (4) is inserted at the bottom of a short hole drilled in the rock. The cartridge (5) is held in place or stemmed by a massive stemming bar (3). A firing pin (2) in the stemming bar (3) strikes a primer which then ignites the propellant (4) in the cartridge (5). The primary method by which the high gas pressures are contained is by the massive inertial stemming bar (3) which blocks the flow of gas up the drill hole (6). A preferred embodiment incorporates an indexing mechanism (37) to allow both a drill (39) and a stemming bar (3) to be used on the same boom (36) for drilling and subsequent charge initiation and firing operations.
IPC 1-7
IPC 8 full level
E21C 37/12 (2006.01); E21C 37/14 (2006.01); E21C 37/16 (2006.01); F42D 1/22 (2006.01); F42D 3/00 (2006.01); F42D 3/04 (2006.01)
CPC (source: EP)
E21C 37/12 (2013.01); E21C 37/16 (2013.01); F42D 1/22 (2013.01); F42D 3/00 (2013.01); F42D 3/04 (2013.01)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 9528551A1
Designated contracting state (EPC)
AT CH DE ES FR GB IT LI SE
DOCDB simple family (publication)
CA 2187750 A1 19951026; CA 2187750 C 20060627; AU 694132 B2 19980716; AU 694132 C 20030710; AU 7393394 A 19951110; EP 0753096 A1 19970115; EP 0753096 A4 19990804; JP H10500745 A 19980120; KR 100319974 B1 20020422; WO 9528551 A1 19951026
DOCDB simple family (application)
CA 2187750 A 19940414; AU 7393394 A 19940414; EP 94923866 A 19940414; JP 52692195 A 19940414; KR 19960705769 A 19961014; US 9404135 W 19940414