煤气储层应力敏感、速敏和水敏性研究

Sensitivity of Stress,Velocity and Water of Coal Gas Reservoir

研究了煤岩储层的应力敏感、水敏和速敏。结果表明,煤岩对应力的敏感规律与砂岩类似,但煤岩是有机质,骨架容易压缩,所以敏感性比砂岩强烈;煤岩疏水接触角为78°~85°,水作为非润湿性流体,不能使孔隙表面疏水性微粒脱落和运移,故无速敏;煤岩在不含水敏性粘土矿物时为无水敏或弱水敏。

The stress,water and velocity sensitivity of coal gas reservoir were studied.It could be seen from the experimental data that the stress sensitive tendency of coal stone was similar to that of sandstone,however coal stone had a stronger stress sensitivity because the matrix of it was prone to compression as a result of being a organic material.The hydrophobic coal stone had a contact angle of 78°-85° and thus the dropout and migration of hydrophobic particles on the pore surface could not be induced by non-...