EP 1112437 B1 20030723 - METHOD FOR THE IN-SITU EXTRACTION OF GAS FROM COAL SEAMS
Title (en)
METHOD FOR THE IN-SITU EXTRACTION OF GAS FROM COAL SEAMS
Title (de)
VERFAHREN ZUR IN-SITU-FÖRDERUNG VON GAS AUS KOHLEFLÖZEN
Title (fr)
PROCEDE D'EXTRACTION IN SITU DE GAZ CONTENU DANS DES VEINES DE CHARBON
Publication
Application
Priority
- DE 9902693 W 19990827
- DE 19839866 A 19980902
Abstract (en)
[origin: DE19839866A1] According to the inventive method for the in-situ extraction of gas from coal seams, the gas extraction rate should be increased. To this end, the invention provides that a pressurization of the borehole which is effective over a prolonged period of time is employed in order to open up the coal. The pressure is lower than the lowest amount of principal stress determined in the respective seam horizon from which gas is to be extracted. The pressurization of the borehole is carried out using a cyclically fluctuating pressure during the opening-up time period.
IPC 1-7
IPC 8 full level
E21B 43/00 (2006.01); E21B 43/16 (2006.01); E21B 43/26 (2006.01)
CPC (source: EP US)
E21B 43/006 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE ES FR GB NL
DOCDB simple family (publication)
DE 19839866 A1 20000309; CN 1097136 C 20021225; CN 1320189 A 20011031; DE 59906375 D1 20030828; EP 1112437 A1 20010704; EP 1112437 B1 20030723; ES 2204166 T3 20040416; PL 346410 A1 20020211; RU 2206718 C2 20030620; US 6571874 B1 20030603; WO 0014379 A1 20000316
DOCDB simple family (application)
DE 19839866 A 19980902; CN 99810233 A 19990827; DE 59906375 T 19990827; DE 9902693 W 19990827; EP 99953624 A 19990827; ES 99953624 T 19990827; PL 34641099 A 19990827; RU 2001108537 A 19990827; US 78648801 A 20010530