水力压裂裂缝对复合地层压裂水平井的影响分析

Advances in Geo-Energy Research, 2018, 2(3): 319-342

原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=75 

  在致密油藏中，水力压裂通常将形成非常复杂的水力裂缝。了解水力压裂对井性能的影响具有重要的意义。作为一种有效的工具，井压力瞬态分析（PTA）和产量瞬态分析（RTA）的半解析解由于其高于数值解的计算效率而被大量使用。本文综合展示了PTA和RTA的方法以及在复合油藏系统（CFS）中的结果。首先，针对不同区域和地层特征，提出了致密复合油藏多级压裂水平井（MsFHW）的数学模型。该模型将具有两个不同地层参数的油藏区域分开，这种假设基于水力压裂之后致密油藏形成两个参数不同的复合区域被提出。考虑压裂裂缝的有限导流能力、倾斜角度及射孔点多翼裂缝的差异等因素，使该模型有力的分析了不同类型的多级压裂水平井的生产性能。内外区域被假定为双重介质，但可以通过简化成单孔介质模型进行求解。然后，通过PTA和RTA中常用的源函数和源函数叠加原理，可以得到MsFHW性能分析模型的解。最后得到并讨论了以恒定产量生产的PTA和在恒定井底压力下生产井的RTA。针对不同的裂缝几何形状，将压力动态曲线划分为不同的流动阶段，分析了不同多级压裂水平井类型对PTA和RTA的影响，并介绍了不同水力裂缝的流入性能。

The Workflow to Analyse Hydraulic Fracture Effect on Hydraulic Fractured Horizontal Well Production in Composite Formation System

Jianwei Yuan，Ruizhong Jiang，Wei Zhang

(Published: 2018-07-21)

CorrespondingAuthor and Email: Ruizhong Jiang, jrzhong@126.com 

Citation: Yuan, J., Jiang, R., Zhang, W. The workflow to analyse hydraulic fracture effect on hydraulic fractured horizontal well production in composite formation system. Advances in Geo-Energy Research, 2018, 2(3): 319-342, doi: 10.26804/ager.2018.03.09.

ArticleType: Original article

Abstract：

    Hydraulic fracturing generally leads to highly complex hydraulic networks for tight oil reservoirs. It is significant to understand the hydraulic fracture effect on well performance. As an effective tool, semi-analytical solution for well pressure transient analysis (PTA) and rate transient analysis (RTA) are used in large amount due to its high calculation efficiency than numerical solution. In this paper, the PTA and RTA method and result in composite formation system (CFS) are shown comprehensively. Firstly, a mathematical model of multistage fractured horizontal well (MsFHW) in CFS was proposed for tight oil reservoir considering different regions and formation properties. In the model, two regions with different formation parameters were distinguished. This assumption of two regions, i.e. CFS is based on that the composite tight oil formation forms after hydraulic fracturing. Difference of finite hydraulic fracture conductivity, inclined angle of hydraulic fracture, difference fracture features between stages and muti-wing fractures in perforating point are considered to make this model powerful to analyze production performance of different MsFHW types. The inner and outer regions were assumed as dual porosity medium but also can solve single porosity medium model by simplification. Then, the solution of MsFHW performance analysis model is obtained by source function method and the source function superposition principle which are common used in PTA and RTA. PTA for well producing at a constant production rate and RTA for well producing at a constant wellbore pressure were obtained and discussed. Different flow regimes were divided for different fracture geometry situations. The effects of different MsFHW types on PTA and RTA were analyzed. The inflow performance for different hydraulic fractures were presented.

Keywords: Tight oil reservoir, composite system, multistage fractured horizontal well, well testing.

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