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Geoscience ›› 2017, Vol. 31 ›› Issue (05): 1088-1094.

• Oil-gas Exploration and Development • Previous Articles    

Controls on High Water Production of CBM Wells in Shouyang Block, Qinshui Basin

LÜ Yumin(), LIU Yinghong, WANG Cunwu, GUO Guangshan, ZHU Xueshen, JIANG Rui   

  1. New Energy Research Center, CNOOC Research Institute, 100028 Beijing,China
  • Received:2016-12-20 Revised:2017-05-15 Online:2017-10-10 Published:2017-11-06

Abstract:

In order to reveal the controlling factors causing high water production of coalbed methane (CBM) wells in Shouyang block, Qinshui Basin, this paper makes a systematic analysis of the impacts of regional hydrogeological conditions, lithological association of coal seams and roofs and floors as well as aquifers, and fracturing techniques on water production of CBM wells, summarizes the geological risk and engineering risk leading to high water production, and finally brings in measures to avoid those risks. Results show that too high fracturing pumping rate is the immediate cause of high water production of CBM wells due to hydraulic connection between coal seams and aquifers, and high angle fractured aquifers nearby coal reservoirs in coal measure strata is the critical geological risk causing high water production of CBM wells. Additionally, unfavorable lithological association and regional hydrogeological conditions are the important factors causing high water production of CBM wells. Therefore, decreasing fracturing pumping rate, avoiding high angle fractured aquifers, and choosing coal seams which develops thick argillaceous roof and floors are the important measures to limit water production of CBM wells.

Key words: coalbed methane, high water production, geology, engineering, Shouyang

CLC Number: