压裂水平缝渗流特征及影响因素SEEPAGE CHARACTERISTICS AND THEIR AFFECTING FACTORS FOR THE FRACTURED HORIZONTAL CRACKS
孟选刚,杜志敏,王香增,白艳改,邵长金
MENG Xuangang,DU Zhimin,WANG Xiangzeng,BAI Yangai,SHAO Changjin
摘要(Abstract)：
为了突破压裂水平缝必须为圆形的假设条件限制,研究了更一般的椭圆形压裂水平缝渗流模型。基于Newman乘积方法和格林函数思想,用无限大地层中的椭圆面源函数和垂直方向条带形地层中条带源函数的乘积得到压裂水平缝的压力响应。从压力及其导数的响应两个方面分析了水平缝渗流特征,分析了裂缝与渗透率的综合因子、裂缝形状、裂缝开度、裂缝位置等参数对渗流特征的影响。以实际油田一口压裂水平缝井的测试为例,应用椭圆水平缝渗流模型能够明确判断水平缝的存在,给出符合实际情况的解释。结果表明,椭圆水平缝模型具有很好的适应性。
In order to break through the restrictions that the fractured horizontal fractures must be rounded,a more general elliptical horizontal fracture filtrating model was studied.Based on Newman's product method and thought of Green's function,the pressure response of the fractured horizontal cracks was given by the product of the elliptical source function in an infinite formation and the strip source function in the vertical strip-shaped formations.The seepage characteristics of the horizontal fractures were analyzed from both responses of the pressure and its derivative;the impacts of the comprehensive factor of the fractures and permeability,crack shapes,crack opening,crack location and other parameters on the flow characteristics were studied.Using the proposed elliptical fracture model,one actual oilfield well test in the fractured horizontal-crack well was made for example,the horizontal fractures can be clearly ensured and determined,and moreover the coincident interpretation was presented with the fact.The achievements show that the elliptical horizontal fracture model has much better adaptability.
关键词(KeyWords)：
椭圆;水平缝;压裂;渗流;特征
elliptical;horizontal fracture/crack;fracturing;seepage/flow/filtration;characteristic
基金项目(Foundation): 中国石油天然气股份有限公司发展战略与科技基础工作决策支持研究“质量计量标准化研究”(2012D-5010)
作者(Author):
孟选刚,杜志敏,王香增,白艳改,邵长金
MENG Xuangang,DU Zhimin,WANG Xiangzeng,BAI Yangai,SHAO Changjin
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