04363518 is referenced by 3 patents and cites 10 patents.

A preliminary fracturing method of a rock bed by spouting highly pressurized water into cracks existing in the rock bed to expand these cracks. The preliminary fracturing method of a rock bed comprises drilling a hole in the rock bed by means of a drilling rod having a cutter blade mounted thereto at the leading end thereof, sealing the leading end of the drilling rod by using rock mucks, injecting a high viscosity fluid from the leading end of the drilling rod into the sealed portion of the hole thereby clogging the cracks, and finally spouting a highly pressurized water or highly pressurized high viscosity fluid from the leading end of the drilling rod thereby expanding the cracks. There is also disclosed an apparatus which is adapted to perform the preliminary fracturing of a rock bed.

Title
Method and apparatus for fracturing rock beds
Application Number
6/209704
Publication Number
4363518
Application Date
November 13, 1980
Publication Date
December 14, 1982
Inventor
Shigetake Akanuma
Chigasaki
JP
Joji Nakamura
Kamakura
JP
Agent
Armstrong Nikaido Marmelstein & Kubovcik
Assignee
Kabushiki Kaisha Komatsu Seisakusho
JP
IPC
E21C 37/12
View Original Source