初裂缝是沿着最大水平主应力方向的垂直缝。
The beginning of crack is vertical along the orientation of maximum horizontal principal stress.
测量结果表明，7个测点的最大水平主应力大于垂直主应力；
The measurement results indicate that:(1) there are 7 measurement points with the maximum horizontal principal in-situ stress more than the vertical principal stress;
本文分析、比较了由不同方法测得的华北地区最大水平主应力方向。
The measured maximum horizontal principal stress orientation in North China by different methods were compared in this paper.
取得了该区最大水平主应力、最小水平主应力量值及最大水平主应力方向。
The maximum and the minimum horizontal stresses and the direction of the maximum horizontal stress are obtained.
最大水平主应力方向以近东西向为主，水力压裂裂缝的延伸方向也以近东西向为主；
The conclusion is that the size of terrestrial stress mainly is vertical principal stress maximum and the fracture of hydraulic fracturing is vertical.
当高角度缝的走向与最大水平主应力的方向一致时，后期水平应力对原生裂缝有保持作用；
When the high-angle fracture has the same direction with the maximum horizontal stress, the subsequent horizontal stress will preserve the primary fracture.
双向水平应力不同时，随着差异的增大，井底岩石各向异性程度增大，钻头向最大水平主应力方向的漂移趋势增强。
If the two horizontal stresses are different, the degrees of rock anisotropism under bottom is increased as long as...
双向水平应力不同时，随着差异的增大，井底岩石各向异性程度增大，钻头向最大水平主应力方向的漂移趋势增强。
If the two horizontal stresses are different, the degrees of rock anisotropism under bottom is increased as long as...
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