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Process for opening up carboniferous seams for underground gasification by drilling production holes downwards

Abstract

This process will reduce drilling costs and times by 20 to 25% and will improve gasification under the influence of a thin liquid medium connecting adjacent holes. After determining the approximate depth and thickness of the seam to be opened up, e.g. by geological means, production holes of 100 to 400 mm (diameter) are made down to a depth of 400 m or more, by well-known boring bars and chisels. After passing the top of the seam (the roof of the seam), which can be recognised by discoloration of the drilling liquid, one goes 1/2 to 1 metre deeper and one determines the depth of the roof the seam exactly by the reduced natural radioactivity at the boundary layer, by introducing a gamma sensor on to the boring bar. The production holes are taken down in a second borehold to a free space 0.6 to 2 metres above the floor of the seam (bottom of the seam), according to the thickness of the seam. After replacing the boring bar by a feedpipe one continues to drill using a boring bar of smaller cutting diameter inside this tube. This hole reaches from the foot of the pipe of the feedpipe to  More>>
Publication Date:
Dec 01, 1977
Product Type:
Patent
Report Number:
DE 2515598; B
Reference Number:
EDB-80-008838
Subject:
01 COAL, LIGNITE, AND PEAT; COAL SEAMS; DRILLING; IN-SITU GASIFICATION; BOREHOLES; COAL GASIFICATION; WELL LOGGING; CAVITIES; COAL DEPOSITS; GASIFICATION; GEOLOGIC DEPOSITS; IN-SITU PROCESSING; PROCESSING; RESOURCES; THERMOCHEMICAL PROCESSES; 010404* - Coal, Lignite, & Peat- Gasification
OSTI ID:
5694423
Country of Origin:
Germany
Language:
German
Submitting Site:
DE
Size:
Pages: 7
Announcement Date:

Citation Formats

Lokschin, J L, Volk, A F, and Starinskii, A A. Process for opening up carboniferous seams for underground gasification by drilling production holes downwards. Germany: N. p., 1977. Web.
Lokschin, J L, Volk, A F, & Starinskii, A A. Process for opening up carboniferous seams for underground gasification by drilling production holes downwards. Germany.
Lokschin, J L, Volk, A F, and Starinskii, A A. 1977. "Process for opening up carboniferous seams for underground gasification by drilling production holes downwards." Germany.
@misc{etde_5694423,
title = {Process for opening up carboniferous seams for underground gasification by drilling production holes downwards}
author = {Lokschin, J L, Volk, A F, and Starinskii, A A}
abstractNote = {This process will reduce drilling costs and times by 20 to 25% and will improve gasification under the influence of a thin liquid medium connecting adjacent holes. After determining the approximate depth and thickness of the seam to be opened up, e.g. by geological means, production holes of 100 to 400 mm (diameter) are made down to a depth of 400 m or more, by well-known boring bars and chisels. After passing the top of the seam (the roof of the seam), which can be recognised by discoloration of the drilling liquid, one goes 1/2 to 1 metre deeper and one determines the depth of the roof the seam exactly by the reduced natural radioactivity at the boundary layer, by introducing a gamma sensor on to the boring bar. The production holes are taken down in a second borehold to a free space 0.6 to 2 metres above the floor of the seam (bottom of the seam), according to the thickness of the seam. After replacing the boring bar by a feedpipe one continues to drill using a boring bar of smaller cutting diameter inside this tube. This hole reaches from the foot of the pipe of the feedpipe to the floor of the seam. It is preferably flushed with gas but may be flushed with liquid. A thin liquid introduced into this hole penetrates the surrounding mass of the seam horizontally (unhindered by any armouring) and represents the required connection to neighbouring bores for gasification. The process is suitable for mining coal, combustible shale oil, bituminous rock, heavy natural oil where this process is based on gasification, melting or dissolving of those deposits.}
place = {Germany}
year = {1977}
month = {Dec}
}