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首页> 外文会议>US Rock Mechanics/Geomechanics Symposium >Large-scale Experimental Investigation of Refracture Reorientation and Field Evaluation in Sand Reservoir
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Large-scale Experimental Investigation of Refracture Reorientation and Field Evaluation in Sand Reservoir

机译：砂水库难识重新定向与现场评价的大规模试验研究

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In situ stress disturbance due to initial fracture existing would make refracture propagation more complex. In this paper mechanics analysis and numerical simulation based on boundary element method have been done to caculate refracture morphology under the altered-stress condition and discusses related influencing factors. Then both of large scale experiment in lab and tiltmeter monitoring in field confirmed fracture reorientation. It showed there were three possible refrac results: (a) a new fracture would initiate at some angles even orthogonal to the azimuth of the initial fracture which is closed. (b) the initial fracture would reopen firstly and a new fracture would initiate at some angles subsequently. (c) instead of new fracture initiation, the initial fracture would reopen and reorient along the direction of maximum stress. The initial and reversal stresses, rock tensile strength, Young Modulus, fracture toughness and pumping parameters determine refrac results together. Field test also confirmed temporary plugging could make multiple fractures initiation to increase drainage area and enhance well production in refracturing. Although a part of the experimental settings is prepared for the special oilfield in China, the conclusions drawn in this study are rather general for refracturing design.
机译：由于初始骨折导致的原位应力扰动将使难识繁殖更加复杂。本文采用了基于边界元法的作用分析和数值模拟，在改变应力条件下进行了抑制作用和探讨了相关影响因素。然后在实验室和TILTMETER监测中的大规模实验都证实了骨折重新定位。它显示有三种可能的refac结果：（a）新的骨折将以一些角度引发，甚至与闭合初始断裂的方位角正交的角度。 （b）首先将重新开放初始断裂，随后将在某种角度发动新的骨折。 （c）代替新的骨折启动，初始断裂将重新打开并沿最大应力方向重新装订。初始和反转应力，岩石拉伸强度，幼模，断裂韧性和泵送参数在一起确定REFRAC结果。现场试验还确认临时堵塞可以使多个裂缝启动提高排水区并增强耐压生产。虽然在中国的特殊油田准备了一部分实验设置，但本研究中得出的结论是抑制设计的相当普遍。

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