水平井分段压裂产量评价技术研究

发布时间：2018-10-21 18:31

【摘要】：水平井分段压裂是有效开发低渗透储层的关键工程技术。压裂后的产量评价对于预测水平井分段压裂效果、指导水平井分段压裂工艺参数设计具有重要意义。但现有水平井分段压裂产量预测模型未重点考虑天然裂缝的影响,且很少考虑封闭边界气藏中水平井压后不同阶段的渗流特征。在充分调研国内外有关水平井分段压裂产量预测文献的基础上,本文以裂缝性气藏为研究对象,开展了考虑天然裂缝影响的复杂人工裂缝形态的水平井分段压裂产量预测研究,主要完成了以下工作： (1)分析了水平井分段压裂后不稳定渗流早期、不稳定渗流晚期和拟稳定渗流时期三个阶段的渗流特征。 (2)分析了水平井压后人工裂缝形态和缝间干扰对渗流的影响,提出了裂缝性气藏压裂裂缝间相互干扰的判别标准。 (3)基于双重介质气藏渗流理论、复位势理论以及压降叠加原理,分别建立了考虑天然裂缝影响的分段压裂水平气井在不稳定渗流早期、不稳定渗流晚期和拟稳定渗流时期的产量预测数学模型,给出了模型的解析解。 (4)编制了分段压裂水平气井产量模拟计算程序,以苏里格气田某井为例进行了水平井压裂产量的实例验证。 (5)计算分析了气藏厚度、井底流压、基质系统孔隙度和天然裂缝系统渗透率等地层参数,以及人工裂缝条数、人工裂缝长度、人工裂缝宽度、人工裂缝渗透率、人工裂缝间距和人工裂缝方位角等人工裂缝参数对水平井分段压裂产量的影响。本文针对裂缝性气藏水平井分段压裂产量预测展开了较为全面深入的研究,并在考虑天然裂缝影响的复杂人工裂缝形态的产量预测模型方面具有一定创新,对于水平井压后动态分析和压裂参数设计具有重要意义。
[Abstract]:Horizontal well fracturing is a key engineering technique for developing low permeability reservoir effectively. The evaluation of production after fracturing is of great significance for predicting the fracturing effect in horizontal wells and guiding the design of fracturing parameters in horizontal wells. However, the existing prediction models of horizontal well fracturing production do not focus on the influence of natural fractures, and seldom consider the seepage characteristics of different stages of horizontal wells in closed boundary gas reservoirs. Based on the investigation of domestic and foreign literatures on the prediction of fracturing production in horizontal wells, this paper takes the fractured gas reservoir as the research object, and carries out a study on the prediction of fracturing production in horizontal wells with complex artificial fracture patterns considering the influence of natural fractures. The main works are as follows: (1) the unstable percolation early after horizontal well fracturing is analyzed. The percolation characteristics of the late stage of unstable seepage and the period of quasi-stable seepage. (2) the influence of artificial fracture morphology and interfracture interference on seepage flow after horizontal well pressure is analyzed. The criterion of mutual interference between fracturing fractures in fractured gas reservoirs is put forward. (3) based on the theory of percolation of dual medium gas reservoirs, the theory of reset potential and the principle of pressure drop superposition, Mathematical models for predicting the production of horizontal gas wells with subsection fracturing considering the influence of natural fractures at the early stage of unstable seepage, the late stage of unstable seepage and the period of quasi-stable seepage are established, respectively. The analytical solution of the model is given. (4) A program for simulating the production of horizontal gas wells by fracturing is developed, and an example of fracturing production in a well in Sulige gas field is given. (5) the thickness of gas reservoir is calculated and analyzed. Formation parameters such as bottom hole flow pressure, matrix system porosity and natural fracture system permeability, as well as artificial fracture number, artificial fracture length, artificial fracture width, artificial fracture permeability, The effect of artificial fracture parameters such as artificial fracture spacing and artificial fracture azimuth on fracturing production in horizontal wells. In this paper, the prediction of fracturing production in horizontal wells of fractured gas reservoirs is studied comprehensively and deeply, and the production prediction model of complex artificial fracture patterns considering the influence of natural fractures is innovated to a certain extent. It is of great significance for the performance analysis and fracturing parameter design of horizontal wells.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357

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