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首页> 外文会议>SPE annual technical conference and exhibition >Fracture geometry and vertical migration in multilayered formations from inclined wells
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Fracture geometry and vertical migration in multilayered formations from inclined wells

机译：倾斜井的多层地层中的裂缝几何形状和垂直运移

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Knowledge of the near-well fracture geometry and the connection with the ultimate fracture propagation are of great importance to hydraulic fracture design. This is particularly true in high-permeability reservoir where the connectivity between the well and the fracture has been viewed as a critical element to the success of the well stimulation. In addition to the fracture geometry difficulties, fracture height migration, that is the vertical fracture growth outside of the target interval is, invariably, an undesirable occurrence (unless the fracture is designed to penetrate a multi-layered formation.) When the fracture propagates through adjoining-to-the-target layers, there arises an impending danger of proppan screen-out leading to excessive pressurization and subsequent ternination of the process. Thereofre, it is essential to control and contain a hydraulic fracture within its target layer and to minimize geometry complexities in the near-well zone. Because inclined wells are drilled frequently in the petroleum industry, this work aims at developing a model for predicting fracture migration heights and the crack paths in multi-layered formations penetrated by such wells. The dependence of fracture initiation conditions on well inclination and mechanical properties are used to predict the migration of fracture height into adjacent layers using fracture mechanics models. The model predictions can be used beneficially in planning hydraulic fractures and in anticipating fracture geometrty, thus, providing dirlling trajectory guidelines. By controlling the fracturing fluid pressur egradient it is possible to affect the fracture geometry. A multi-layer approximation approach is presented to provide a formulation of the inclined well problem. The effects of well inclination and stress contrast on fracture height migration are studied and guidenlines ar eoffered on the desired well trajectories in view of property contrasts among layers for acceptable fracture geometries.
机译：了解近井裂缝的几何形状以及与最终裂缝扩展的联系对水力裂缝设计非常重要。在高渗透率油藏中尤其如此，在该油藏中，井与裂缝之间的连通性已被视为成功增产井眼的关键因素。除了裂缝的几何形状困难之外，裂缝高度迁移（即垂直裂缝在目标区间之外的增长）总是不希望发生的（除非裂缝被设计为穿透多层地层）。在与目标层相邻的位置上，会出现将丙烷筛出的潜在危险，从而导致过度加压并随后终止该过程。因此，必须控制并在其目标层内控制水力压裂，并最大程度地减少近井区的几何复杂性。因为在石油工业中经常钻斜井，所以这项工作的目的是建立一个模型，以预测这种井穿透的多层地层中的裂缝运移高度和裂缝路径。利用裂缝力学模型，将裂缝起始条件对井倾角和力学性能的依赖性用于预测裂缝高度向相邻层的迁移。该模型预测可有益地用于计划水力裂缝和预测裂缝的几何形状，从而提供令人迷惑的轨迹准则。通过控制压裂液的压力，可以影响裂缝的几何形状。提出了一种多层近似方法，以提供对倾斜井问题的表述。研究了井斜率和应力对比对裂缝高度偏移的影响，并根据可接受的裂缝几何形状之间的层间对比，为所需的井眼轨迹提供了指导线。

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