煤层气储层水平井钻井过程中储层伤害机理

Mechanism of reservoir damage during horizontal well drilling in coalbed methane reservoirs

煤层气水平井钻井过程中煤储层极易受到钻井液、固相颗粒、钻井压力等因素引起的储层伤害,本文以山西沁水盆地的2#煤层和1#煤层为例,通过室内实验研究了煤储层在钻井过程中的伤害机理。为减少和避免煤层气储层在水平井钻井过程中引起的伤害,提出了相应的预防和保护措施。

The middling coal reservoir is vulnerable to reservoir damage caused by drilling fluid,solid particles,drilling pressure and other factors during the drilling of CBM horizontal wells.This paper takes the 2#coal seam and 1#coal seam in Qinshui Basin,Shanxi Province as examples to study the damage mechanism of coal reservoirs during the drilling process through laboratory experiments.To reduce and avoid the damage caused by coalbed methane reservoirs during horizontal well drilling,corresponding prevention and protection measures have been proposed.