煤层气井内隔水层界面水窜通道形成演化过程
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摘要
对煤层气井除了贯穿隔水层的压裂缝、天然构造通道和采动裂隙贯通这3条水窜通道之外,隔水层界面会否是另一条水窜通道进行研究.基于自主构建的隔水层界面水窜试验装置,对7种压差(0.2,0.3,0.5,0.8,1.0,1.3,1.5 MPa)和3种泥饼厚度(0.1,0.3,0.5mm)条件下隔水层界面水窜进行了试验研究,认为隔水层界面水窜形成演化过程可划分为3个阶段,即ξ<1.00时水窜处于渗透阶段,1.00<ξ<1.12时水窜处于溶蚀阶段,ξ>1.12时水窜处于致突阶段.研究结果表明:随着压差增大,隔水层界面水窜时间和通道形成时间均越短,而当流量达到最大值后会迅速减小,减至最小值后又会略有升高,最后趋于平稳,且平缓段的流量与压差成正比关系,这与隔水层界面当量渗透率变化规律是一致的;隔水层界面水窜时间与泥饼厚度呈非线性关系,且随着泥饼厚度增加,隔水层界面水窜通道的形成时间缩短,而隔水层界面当量渗透率的最小值和变化范围均呈对数式增长.
In addition to channeling through the fracturing cracks,natural structural cracks and mining cracks,whether the cement-aquifuge interface(CAI)can be another water channeling pathway in coalbed methane well demands further research.Based on the self-constructed experimental device,the water channeling along CAI was studied under seven kinds of pressure differences(0.2,0.3,0.5,0.8,1.0,1.3,1.5MPa)and three kinds of mud cake thicknesses(0.1,0.3,0.5mm).It is considered that the evolution process of water channeling along CAI can be divided into three stages.Whenξ<1.00,the water channeling is in the permeation stage.When 1.00<ξ<1.12,the water channeling is in the dissolution stage.Whenξ>1.12,the water channeling is in the water-inrush stage.The results show that the water channeling time and pathway breakthrough time along CAI shorten with the increase of pressure difference.When the flow rate reaches the maximum value,it will decrease rapidly,and then increase slightly after it reaches the minimum value.Finally,it will become stable,and the flowof the gentle section is proportional to the pressure difference,which is consistent with the variation of the equivalent permeability at CAI.The water channeling time along CAI is non-linear with the mud cake thickness,and as the mud cake thickness increases,the pathway breakthrough time along CAI shortens,and the minimum value and change range of the equivalent permeability at CAI increase by logarithms.
In addition to channeling through the fracturing cracks,natural structural cracks and mining cracks,whether the cement-aquifuge interface(CAI)can be another water channeling pathway in coalbed methane well demands further research.Based on the self-constructed experimental device,the water channeling along CAI was studied under seven kinds of pressure differences(0.2,0.3,0.5,0.8,1.0,1.3,1.5MPa)and three kinds of mud cake thicknesses(0.1,0.3,0.5mm).It is considered that the evolution process of water channeling along CAI can be divided into three stages.Whenξ<1.00,the water channeling is in the permeation stage.When 1.00<ξ<1.12,the water channeling is in the dissolution stage.Whenξ>1.12,the water channeling is in the water-inrush stage.The results show that the water channeling time and pathway breakthrough time along CAI shorten with the increase of pressure difference.When the flow rate reaches the maximum value,it will decrease rapidly,and then increase slightly after it reaches the minimum value.Finally,it will become stable,and the flowof the gentle section is proportional to the pressure difference,which is consistent with the variation of the equivalent permeability at CAI.The water channeling time along CAI is non-linear with the mud cake thickness,and as the mud cake thickness increases,the pathway breakthrough time along CAI shortens,and the minimum value and change range of the equivalent permeability at CAI increase by logarithms.
引文
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