致密砂岩气藏复杂缝网产能规律研究

发布时间：2018-10-26 08:10

【摘要】：致密砂岩储层具有低孔低渗的特点,单井基本无自然产能,必须通过压裂改造等措施才能获得工业气流。然而常规压裂往往效果不理想,需要采用新的压裂技术才能满足要求。近几年发展起来的体积压裂技术是致密砂岩储层开发的重要技术之一。储层改造体积是用来评价致密砂岩体积压裂后产能的重要参数,储层改造体积的大小决定了压裂后的增产效果。目前国内外对于储层改造体积的计算方法研究较少、不够系统,致密砂岩体积压裂产能的计算也基本是参考常规压裂的计算方法,没有充分考虑储层改造体积的影响。本文在充分调研文献的基础上,以离散裂缝网络模型(DFN)为基础,考虑致密砂岩储层物性和压裂施工参数,建立了计算储层改造体积的物理模型和数学模型,并以此为基础开发了体积压裂储层改造体积计算程序。运用该程序研究分析了纵横比、压裂时间、综合滤失系数、储层厚度、水平主应力差、有效弹性模量对储层改造体积的影响规律,并以改造体积为目标对压裂施工参数进行优化设计;在储层改造体积物理模型的基础上,建立了致密砂岩复杂缝网产能的物理模型,考虑裂缝的复杂性,推导了致密砂岩复杂缝网的产能公式,研究了裂缝条数、裂缝长度、裂缝导流能力、次生裂缝形态、储层渗透率、储层厚度等对产能的影响,应用正交试验分析法和灰色关联理论研究了多因素对致密砂岩体积压裂水平井产能的影响以及影响程度的主次关系,并对裂缝参数进了优化计算。研究成果对致密砂岩体积压裂工艺参数优选具有一定的参考价值。
[Abstract]:The tight sandstone reservoir has the characteristics of low porosity and low permeability, and the single well has no natural productivity, so it is necessary to obtain industrial airflow through fracturing and other measures. However, the effect of conventional fracturing is often not satisfactory, and new fracturing techniques are needed to meet the requirements. The volume fracturing technology developed in recent years is one of the important technologies in the development of tight sandstone reservoir. Reservoir reconstruction volume is an important parameter to evaluate the productivity of tight sandstone after fracturing, and the size of reservoir reconstruction volume determines the effect of increasing production after fracturing. At present, there is little research on the calculation method of reservoir reconstruction volume at home and abroad, and the calculation of volume fracturing productivity of tight sandstone is basically referring to the conventional fracturing calculation method, and the effect of reservoir reconstruction volume is not fully considered. On the basis of full investigation and research, based on discrete fracture network model (DFN) and considering the physical properties of tight sandstone reservoir and fracturing operation parameters, the physical and mathematical models for calculating the volume of reservoir reconstruction are established in this paper. Based on this, the volume calculation program of volume fracturing reservoir is developed. The effects of aspect ratio, fracturing time, comprehensive filtration coefficient, reservoir thickness, horizontal principal stress difference and effective modulus of elasticity on the volume of reservoir reconstruction are studied and analyzed by using this program. And the optimized design of fracturing parameters is carried out with the reconstruction volume as the target. Based on the physical model of reservoir reconstruction volume, the physical model of complex fracture network productivity of tight sandstone is established. Considering the complexity of fracture, the productivity formula of complex fracture network of tight sandstone is derived, and the number of fractures and the length of fracture are studied. The effects of fracture conductivity, secondary fracture morphology, reservoir permeability and reservoir thickness on productivity, The influence of multiple factors on the productivity and the primary and secondary relationship of the influence degree of the horizontal well of compact sandstone volume fracturing are studied by using orthogonal test analysis and grey correlation theory, and the fracture parameters are optimized. The research results have certain reference value for optimizing the parameters of bulk fracturing of tight sandstone.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE377;TE328

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