为揭示水力压裂对天然断层活动性的影响,根据实际工程地质资料建立应力-渗流耦合数值模型,模拟水力压裂诱发断层活动.分析水力裂缝与天然断层的相互作用,研究压裂过程中断层滑移、孔隙压力分布以及震级的演化规律.研究结果表明:水力裂缝可能扩展至上覆断层,裂缝尖端的张应力将导致断层与裂缝交叉附近出现接触应力和剪切应力集中,导致断层失稳.而在裂缝尖端与断层连通后,压裂液渗流至断层破碎带,断层面的孔隙压力显著增大.水力裂缝尖端穿过砾岩层与断层面连通时矩震级达到最大.研究结论为水力压裂施工诱发微震提供理论支撑.

In Mahu depression of Baikouquan formation with low porosity and low permeability reservoir thickness,oil and gas shows at the top.There are lithology and stress shielding layer in the underpart of the reservoir,and the fracture tends to extend downward in the fracturing,the proppant is easy deposits in the lower part of the reservoir.In recent years,for the effective use of thick reservoirs,the technology of secondary sand fracturing and soluble fiber suspension and combination of bottom laying sand control is carried out.Through the continuous improvement of reservoir reconstruction technology,the effective use of high quality reservoirs has been realized.It shows that the bottom sand laying technology of combined process and soluble fiber suspension sand technology is better than that of the secondary sand fracturing.D13 well adopts combination technology to control bottom sand laying technology,the highest daily production oil is 40.55 cubic meters per day,Nissan gas is 3070m3,that productivity test is 165 days,accumulated oil production 2083.11m3.It has realized the effective transformation of reservoir.