压裂水平井生产动态数值模拟研究  

Numerical Simulation Research of Fractured Horizontal Well Production Performance

作　　者：邵昭媛[1,2] 宁宁[2] 刘华勋[1,2] 高树生[1,2] 赵芳[1,2] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《天然气地球科学》2015年第4期737-743,共7页Natural Gas Geoscience

基　　金：国家科技重大专项项目"致密砂岩气有效开发评价技术"(编号:2011ZX05013-002)资助

摘　　要：针对压裂水平井的渗流特征,建立了低渗透气藏压裂水平井定产开发数学模型,模型考虑了应力敏感效应和含水饱和度的影响。通过数值模拟,研究了渗透率、含水饱和度、裂缝条数、裂缝半长、水平段长度等因素对压裂水平井产能的影响规律,得到了不同参数下的产气量及采出程度动态变化曲线,并分析了不同参数对动态变化曲线的影响程度。研究表明:渗透率越小,含水饱和度对采出程度影响越大;渗透率小于0.1×10-3μm2时,稳产时间和采出程度显著下降,所以渗透率小于0.1×10-3μm2的储层是压裂水平井参数优化的重点;对于裂缝条数已知,渗透率越低,合理水平井长度越短,对于水平井长度已知,渗透率越低,合理裂缝条数越多、合理裂缝半长越大;对于具体气藏来说,在储层基本参数给定的情况下,裂缝条数、裂缝长度、水平段长度都不是越大越好,应该存在一个最优的匹配关系。According to the seepage characteristics of fractured horizontal wells, a constant production mathematic model was established for the fractured horizontal wells in low permeability gas reservoirs. The model takes into account the stress sensitive effect and the influence of water saturation. Through the numerical simulation,the influence of the permeability, water saturation, fracture number, fracture semi-length, horizontal section length on the productivity of fractured horizontal gas wells is analyzed. The dynamic variation curves of gas production rate and recovery degree under different parameters are obtained, and the influence of different parameters on the dynamic change curve was analyzed. The results show that the smaller the permeability and water saturation, the greater the effects on recovery degree. Permeability is less than 0.1 × 10^-3μm^2. There is a significant reduction in the stable time and recovery degree, so reservoir permeability less than 0. 1 × 10^-3μm^2 is the focus of the horizontal well parameter optimization. For the known fracture number, the lower the permeability, the shorter of the proper length of the horizontal well. For the known horizontal well length,the lower the permeability, the more reasonable the fracture number and the greater the reasonable fracture semi-length. For a specific gas reservoir, under the given condition of reservoir basic parameters, the fracture number,the fracture length and the horizontal section length are not the bigger the better. There should be an optimal matching.

关 键 词：低渗透 水平井 裂缝 数值模拟 生产动态 

分 类 号：TE34[石油与天然气工程—油气田开发工程]