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为准确预测水力压裂过程中水力裂缝是否会穿过天然裂缝及其穿出方向,基于弹性力学理论,建立了水力裂缝穿过天然裂缝的判断准则,并给出了水力裂缝穿出天然裂缝时穿出角度的计算方法。计算结果表明:在给定逼近角下对应有确定的水力裂缝穿过天然裂缝所需的水平主应力比值范围,超过或低于这个范围水力裂缝将不能穿过天然裂缝;高逼近角及高水平主应力比值下水力裂缝易直接穿过天然裂缝;在相同逼近角下,水平主应力比值越大,穿出方向总是倾向于靠近增大的水平主应力方向。
In order to accurately predict whether hydraulic fractures will cross the natural fractures and their piercing directions during the hydraulic fracturing, a criterion for determining the hydraulic fractures passing through the natural fractures is established based on the theory of elastic mechanics. Piercing angle calculation method. The calculated results show that the ratio of the horizontal principal stress required for a given hydraulic fracture to pass through a natural fracture is within a given approach angle, and hydraulic fractures will not pass through the natural fracture above and below this range. The high approach angle and high level Under the same approach angle, the larger the horizontal principal stress ratio, the piercing direction always tends to approach the direction of increasing horizontal principal stress.