短期气液测裂缝导流能力影响因素分析

Analysis of influencial factors of fracture conductivity of gas and liquid logging for short-term

为了分析短期气液测导流能力影响因素,考虑时间、实验流速、闭合压力及流体相态因素,利用支撑剂导流能力室内实验来对比分析短期气液测导流能力差异。实验结果表明:液测导流能力随时间呈递减趋势并且很难在短时间内达到稳定状态,而气测导流能力随时间变化不明显且短时间就可以达到稳定状态;实验流速对导流能力产生一定影响且随流速增加导流能力有较小幅度的增加;闭合压力对导流能力影响较大,随着闭合压力增加气液测导流能力明显下降且气测导流能力下降速度明显强于液测。流体相态对导流能力的影响同样显著,闭合压力为10 MPa和80 MPa下气液测导流能力分别达到最大和最小值,10 MPa下气测导流能力是液测的2.67倍,80 MPa下为3.10倍。

In order to analyse influence factors of flow conductivity of gas logging and liquid logging for short-term, considering the factors of time, flow rate, closure pressure and fluid phase state in laboratory experiments of proppant flow conductivity to compare and analyse the difference of gas logging and liquid logging for short-term. Experimental result shows that flow conductivity of liquid logging decreased with time and it’s difficult to a stable state within short-term. However, the change of flow conductivity of gas logging is not obvious and it’s easy to get a stable state for short-term. The flow rate has a certain impact on flow conductivity and flow conductivity has a smaller increase with flow rate. The closure pressure can strongly affect the flow conductivity, flow conductivity of gas and liquid logging decreased with closure pressure and the decline rate of flow conductivity of gas logging is obviously stronger than liquid logging. The effect of fluid phase state on flow conductivity is also significant, the flow conductivity of gas and liquid logging achieves maximum and minimum values when the closure pressures are 10 MPa and 80 MPa respectively, the flow conductivity of gas logging is 2.67 times higer than liquid logging when closure pressure is 10 MPa,it’s 3.10 times when closure pressure is 80 MPa.