压裂气藏裂缝扩展和裂缝干扰对水平井产能影响
来源期刊：中南大学学报(自然科学版)2013年第4期
论文作者：姚同玉 朱维耀 李继山 王明
文章页码：1487 - 1492
关键词：压裂气藏；水平井；裂缝干扰；裂缝扩展；产能预测
Key words：fractured gas reservoir；horizontal wells；fracture mutual interference；fracture propagation，production prediction
摘 要：基于非稳态渗流理论，应用椭圆渗流思想，在压裂气藏基质椭圆流和压裂裂缝高速非达西渗流耦合中，引入裂缝干扰，建立压裂水平井产能预测模型。利用数值求解方法分析椭圆长轴、短轴在气藏开采中的扩展规律，揭示了裂缝的扩展特征。算例计算结果表明：裂缝控制的椭圆长轴、短轴随生产时间逐渐扩展，短轴扩展速度要大于长轴，渗流区逐渐由椭圆转化为圆形；相邻裂缝控制的椭圆流在200 d左右开始相交，发生干扰，并且随着时间的增加，相交面积逐渐增加，干扰加剧，考虑裂缝干扰后，产量递减速度变大，此时，与裂缝导流能力相比，裂缝长度对产量影响更为显著。研究成果对气藏压裂水平井的设计提供了科学依据。
Abstract: Based on unsteady flow in porous media, using elliptical flow theory and considering the coupling between the elliptic flow in reservoir matrix and the high speed non-Darcy flow in fractures of fractured gas reservoir, a production prediction model of fractured horizontal wells considering mutual interference between fractures was built. The numerical method was used to analyze the propagation law of the major axis and the minor axis in gas reservoir, which reveals the fracture propagation characteristics. Calculation results show that the major axis and minor axis controlled by the fractures gradually extend with the production time, and the propagation speed of the minor axis is larger than that of the major axis, which results in the flow zone changing from ellipse to circular. The elliptic flow controlled by the fractures adjacent will slowly intersect at about 200 d. With time going on, the intersecting area is larger, the mutual interference is more. After the interference of fractures adjacent is considered, the decrease speed of the production is higher. The effect of the fracture length on production is more marked than that of flow conductivity. The research results provide a scientific basis for the design of fractured horizontal wells in gas reservoir.
姚同玉1，朱维耀2，李继山3，王明2
(1. 中国石油大学 石油工程学院，山东 青岛，266580；2. 北京科技大学 土木与环境工程学院，北京，100083；3. 胜利油田有限责任公司 地质科学研究院，山东 东营，257015)
摘 要：基于非稳态渗流理论，应用椭圆渗流思想，在压裂气藏基质椭圆流和压裂裂缝高速非达西渗流耦合中，引入裂缝干扰，建立压裂水平井产能预测模型。利用数值求解方法分析椭圆长轴、短轴在气藏开采中的扩展规律，揭示了裂缝的扩展特征。算例计算结果表明：裂缝控制的椭圆长轴、短轴随生产时间逐渐扩展，短轴扩展速度要大于长轴，渗流区逐渐由椭圆转化为圆形；相邻裂缝控制的椭圆流在200 d左右开始相交，发生干扰，并且随着时间的增加，相交面积逐渐增加，干扰加剧，考虑裂缝干扰后，产量递减速度变大，此时，与裂缝导流能力相比，裂缝长度对产量影响更为显著。研究成果对气藏压裂水平井的设计提供了科学依据。
关键词：压裂气藏；水平井；裂缝干扰；裂缝扩展；产能预测
YAO Tongyu1, ZHU Weiyao2, LI Jishan3, WANG Ming2
(1. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China;2. Civil and Environmental Engineering School, University of Science Technology Beijing, Beijing 100083, China;3. Geological Scientific Research Institute of Shengli Oilfield Company Ltd., Dongying 257015, China)
Abstract:Based on unsteady flow in porous media, using elliptical flow theory and considering the coupling between the elliptic flow in reservoir matrix and the high speed non-Darcy flow in fractures of fractured gas reservoir, a production prediction model of fractured horizontal wells considering mutual interference between fractures was built. The numerical method was used to analyze the propagation law of the major axis and the minor axis in gas reservoir, which reveals the fracture propagation characteristics. Calculation results show that the major axis and minor axis controlled by the fractures gradually extend with the production time, and the propagation speed of the minor axis is larger than that of the major axis, which results in the flow zone changing from ellipse to circular. The elliptic flow controlled by the fractures adjacent will slowly intersect at about 200 d. With time going on, the intersecting area is larger, the mutual interference is more. After the interference of fractures adjacent is considered, the decrease speed of the production is higher. The effect of the fracture length on production is more marked than that of flow conductivity. The research results provide a scientific basis for the design of fractured horizontal wells in gas reservoir.
Key words:fractured gas reservoir；horizontal wells；fracture mutual interference；fracture propagation，production prediction
