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首页> 外文会议>SPE Western Regional Meeting >Stability Analysis of Multilateral High Density Pad Wells in the Three Forks Formation
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Stability Analysis of Multilateral High Density Pad Wells in the Three Forks Formation

机译：三叉形成多边高密度垫井的稳定性分析

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In order to increase the productivity from the Three Forks Formation, drilling horizontal well and multilateral ones, in particular, seems inevitable. A multilateral well is defined as a single well with one or more wellbore branches radiating from a main vertical borehole. A successful multilateral well that replaces several vertical wellbores will not only increase production, but also reduces overall drilling and completion costs, and allows more efficient hydraulic fracturing operations. Reducing surface impoacts while developing a field is a major benefit of this drilling plan. Well placement and design to have enough stability where in-situ stresses are disturbed dramatically due to short well spacing and stress shadowing is a crucial task, which should be studied prior to any drilling operation. Instability problems in multilateral wells can result from stress interplay among nearby wellbores. In this paper, instability of the borehole around the horizontal section of the high-density multilaterals, also known as pad drilling is studied. This drilling technique is growing very fast in the Williston Basin to increase production from two main hydrocarbon layers in the basin, Bakken and Three Forks Formations. Focusing on the Three Forks Formation, mechanical properties of this rock unit such as Poisson’s ratio, Young’s modulus and Unconfined Compressive Strength (UCS) have been extensively investigated and reported through filed data and lab experiments. These parameters, along with the calculated in-situ principal horizontal and vertical stresses, were input into a numerical simulation software, Flac 2D, to understand drilling impacts and to analyze borehole instability through a geomechanical model. For the final results, we have presented stress perturbation, rock displacements and creation of different failure zones around the borehole in the vertical and horizontal direction after the medium is penetrated.
机译：为了提高三个叉组的生产率，特别是钻井水平井和多边似乎是不可避免的。多边孔定义为单个孔，与一个或多个井筒分支从主垂直钻孔辐射辐射。成功的多边井取代了几个垂直井中的井不仅会增加生产，而且还降低了整体钻井和完成成本，并允许更有效的液压压裂操作。在开发领域的同时，减少表面会造成这种钻井计划的主要益处。井放置和设计具有足够的稳定性，其中原位应力由于短井间隔和应力阴影而被显着扰乱，并且应在任何钻井操作之前应研究这一项至关重要的任务。多边井中的稳定性问题可能是由附近的井筒之间的压力相互作用。在本文中，研究了高密度多边的水平部分周围的钻孔的不稳定性，也称为垫钻孔。这种钻井技术在威利斯顿盆地中的生长非常快，以增加盆地，Bakken和三个叉结构中的两个主要碳氢化合物层的产量。专注于三叉形成，这种岩石单元的机械性能，如泊松比，杨氏模量和无束缚的抗压强度（UCS）已被广泛研究，并通过提交的数据和实验室实验报道。这些参数以及计算出的原位主体水平和垂直应力，被输入到数值模拟软件FLAC 2D中，以了解钻孔冲击，并通过地质力学模型分析钻孔不稳定性。对于最终结果，在介质穿透后，我们呈现了应力扰动，岩石位移，围绕钻孔周围的不同故障区的创建。

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