沁南与鄂东原生结构煤岩压裂液滤失效应对比实验研究

Comparative experimental study on filtration loss effect of primary structure coal rock fracturing fluid in Qinnan and Edong

本文选取沁南和鄂东煤矿大块原生结构煤岩,通过改进的滤失仪设备进行压裂滤失实验,实时观察滤失现象,测量滤失相关参数,定性与定量分析滤失效应。实验结果表明,在同等泵送压力条件下,煤岩滤失性能差异很大,沁南煤岩滤失要大于鄂东煤岩。对比煤岩的裂缝发育特征发现,煤岩的滤失很大程度上受煤岩节理裂隙发育特征的影响。煤储层作为裂隙性储层,在裂隙发育区,必须采取合理有效的手段降低滤失性能,为下一步煤层气勘探开发提供理论依据。

In this paper, a large number of primary structure coal and rock in Qinnan and Edong coal mines are selected.Fracturing filtration experiments are carried out by improved filter equipment, real-time observation of filtration phenomenon, measurement of filtration related parameters, qualitative and quantitative analysis of filtration effect. The experimental results show that under the same pumping pressure, the filtration performance of coal and rock varies greatly,and the filtration performance of Qinnan coal and rock is greater than that of Edong coal and rock. By comparing the fracture development characteristics of coal and rock, it is found that the filtration of coal and rock is largely affected by the fracture development characteristics of coal and rock joints. As a fractured reservoir, coal reservoir must take reasonable and effective measures to reduce filtration performance in fractured zone, which provides a theoretical basis for further exploration and development of coalbed methane.