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A Semi-Analytical Boundary Element Method to Modeling and Simulation ofFluid-Driven Single/Multi Fractures in Reservoirs

机译:一种半分析边界元法,用于建模与模拟整体流水下的单/多骨折

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The major goal to propose the semi-analytical method is to model/simulate hydraulic fracturing processbased on closed form solution of a Theory of Elasticity problem. The analysis results for a Single-Fracturecase is going to be compared to well-known resolved problem to show the performance of the proposedmethod. However, for the case of Multi-Fracture, some findings and outcomes are being addressed. Unlikewell-known methods such as PKN or KGD, which rely on some simplifying assumptions (such as theelliptical cross-section of the fractures) our proposed method attempts to model and simulate the processnumerically in 3D form which is more realistic and versatile. Several numerical methods have been proposedby industry scholars such as BEM and FEM which comprise very complicated numerical integrations and,hence, involve computational resources dramatically. Our proposed method utilizes a closed form ElasticityProblem to reduce the volume of numerical integrations and produce satisfactory results in much less amountof time. The formulation computes displacements and displacement derivatives. After computer codes weredesigned and developed to implement the proposed semi-analytical Method, which is a simplified form ofBoundary Element Method (BEM), the results are compared to a benchmark example previously publishedin research papers both numerically and graphically. The computer code is capable to analyze pressurizedpenny-shaped fractures and compute displacement and displacement derivative fields. By acquiring thesevalues in generated grid nodes in the domain, Cauchy strains and stresses can be obtained. By all the stresscomponents at grid nodes, principal stress values and directions, and therefore, maximum shear stress anddirection can be computed. After that, the computer code has to be verified and validated by comparison ofresults and well-known resolved examples. The examples are, but not limited to, Okada problems publishedin 1985 and 1992. The other Problem is pressurized Penny-Shaped horizontal fracture which is called FialkoModel. The comparisons show the validity of the proposed method. The boundary element formulationin this method is an exact solution and generates exact values for displacements, displacement derivativesand stress fields and does not need numerical integration. However, since hydraulic fractures of any shapeand geometry are being discretized by proposed Boundary Element, the final outputs will be approximatedresults. This method, which is going to be shown, is much faster than other numerical methods.
机译:提出半分析方法的主要目标是在弹性问题的封闭形式溶液上进行模拟/模拟液压压裂过程。单次骨折化酶的分析结果将与众所周知的解决问题进行比较,以显示预设的方法。然而,对于多骨折的情况,正在解决一些发现和结果。与PKN或KGD等相关的方法依赖于某种简化的假设(例如骨折的晶圆形横截面),我们所提出的方法试图以更现实和多功能的3D形式模拟和模拟过程中的基础形式。已经提出了几种数值方法,例如BEM和FEM,包括非常复杂的数值集成,因此涉及急剧计算资源。我们所提出的方法利用封闭的形式弹性问题,以减少数值积分的体积,并产生令人满意的结果,更少的时间。制剂计算位移和位移衍生物。在计算机代码WERDERSING和开发以实现所提出的半分析方法之后,这是一种简化形式的元素方法(BEM),将结果与先前和以图形方式一起发布的基准示例进行比较。计算机代码能够分析加压的垂体形状和计算位移和位移衍生区域。通过获取在域中的生成网格节点中的值,可以获得Cauchy菌株和应力。通过网格节点的所有应力组成,主应力值和方向,因此,可以计算最大剪切应力频率。之后,必须通过比较和众所周知的解决示例进行验证和验证计算机代码。这些例子是但不限于冈田问题,1985年和1992年出版。另一个问题是加压的便士形水平骨折,称为Fialkomodel。比较显示了所提出的方法的有效性。该方法的边界元拟议框架是精确的解决方案,并为位移,位移衍生物和应力字段产生精确值,并且不需要数值积分。然而,由于任何Shadeand几何形状的液压裂缝被提出的边界元件离散化,因此最终输出将是近似的结果。该方法将被示出,比其他数值方法快得多。

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