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首页> 外文期刊>Arabian Journal for Science and Engineering >Investigation of the Influence of Natural Cavities on Hydraulic Fracturing Using Phase Field Method
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Investigation of the Influence of Natural Cavities on Hydraulic Fracturing Using Phase Field Method

机译：利用相场法研究自然空腔对水力压裂的影响

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摘要

In this paper, the influence of natural cavities on the propagation of hydraulic fractures is investigated using the phase field method. The deflection behaviour of a fracture during its propagation is firstly verified against published experimental data. Then, a sensitivity analysis on the mechanical behaviour of fracture propagation near a cavity is conducted. The fracture deflection is quantified in terms of the deviation distance and deflection point. The influence of the Young's modulus ratio between the cavity and rock mass (E-r= E-cave/E-rock), the differential stress (S-d= S-x - S-y) and the relative spatial position of the fracture and cavity (l(r)) on the propagation trajectory are considered. Simulation results show that with the decrease in E-r, crack path deviation becomes more prominent. With the increase in S-d, hydraulic fractures tend to propagate along the direction of maximum horizontal geostress. As l(r) varies, the deflection of the hydraulic fracture can be classified into three regimes: (1) the deflection is negligible; (2) the hydraulic fracture deflects and approaches the natural cavity, but does not connect with it; (3) the hydraulic fracture deflects and connects with the natural cavity. The results could be used as guidance for field design of stimulation scheme in carbonate oil/gas reservoirs.
机译：本文利用相场法研究了天然孔洞对水力压裂扩展的影响。首先根据已公开的实验数据验证了裂缝在扩展过程中的偏转行为。然后，对腔附近裂缝扩展的力学行为进行了敏感性分析。断裂挠度根据偏差距离和挠度点来量化。孔洞与岩石质量之间的杨氏模量比（Er = E凹面/ E-岩石），压差（Sd = Sx-Sy）和裂缝与孔洞的相对空间位置（l（r））的影响）在传播轨迹上被考虑。仿真结果表明，随着E-r的减小，裂纹路径偏差变得更加明显。随着S-d的增加，水力压裂趋向于沿最大水平地应力方向扩展。随着l（r）的变化，水力压裂的挠度可分为三种情况：（1）挠度可忽略不计； （2）水力裂缝偏斜并接近自然空腔，但不与自然空腔连通； （3）水力裂缝挠曲并与天然腔连通。研究结果可为碳酸盐岩油气藏增产方案的现场设计提供指导。

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