Title:
【発明の名称】溶融穿孔方法
Document Type and Number:
Japanese Patent JPH01501878
Kind Code:
A
Abstract:
PCT No. PCT/DE88/00013 Sec. 371 Date Nov. 21, 1988 Sec. 102(e) Date Nov. 21, 1988 PCT Filed Jan. 12, 1988 PCT Pub. No. WO88/05491 PCT Pub. Date Jul. 28, 1988.In a heat drilling process for tunnels, deep well and exploration boreholes, only a gap defining the outer profile of the tunnel or borehole is melted down. The drill core surrounded by this gap initially remains and is then extracted at intervals via the melted zone. It is expedient for the drill core to be sheared off and extracted continuously after it has passed a cooling zones. The height of the drill core which first remains in the borehole is determined such that the molten rock can be pressed into the drill core, whereby for this pressing in the necessary pressure is maintained essentially constant independently of the depth of the borehole concerned.
Inventors:
Foppe, Werner
Application Number:
JP50636787A
Publication Date:
June 29, 1989
Filing Date:
January 12, 1988
Export Citation:
Assignee:
Compisa AG
International Classes:
E21B7/14; E21B7/15; E21B10/02; E21B25/10; E21B; (IPC1-7): E21B25/10; E21B10/02; E21B7/14
Attorney, Agent or Firm:
Tatsuyuki Unuma (4 others)