诱导渗透率场中压裂水平井压力动态分析模型

发布时间：2018-04-23 20:37

本文选题：诱导渗透率场 + 体积压裂　；参考：《天然气地球科学》2017年05期

【摘要】：体积压裂技术是致密、页岩气藏开发的关键技术。目前在试井解释和产能评价的研究中尚缺乏考虑压裂改造体积(SRV)内复杂非均质性诱导渗透率场的渗流数学模型。为此,在假设渗透率与距主裂缝面的距离呈指数和线性式关系的基础上建立起诱导渗透率场模型,将其与渗流场进行耦合,并结合线性流模型创建有限导流能力多段压裂水平井渗流数学模型,结合Bessel函数理论和GWR数值反演算法得到真实空间的压力解,绘制气井压力动态曲线,分析SRV区诱导渗透率分布情况等特征参数对气井压力变化规律的影响。结果表明,SRV区渗透率呈递减型分布时,气井压力动态曲线过早出现边界响应特征,反之气井生产动态曲线在边界反应段之前会出现平缓甚至下凹的过渡段,且容易将其误认为为径向流动阶段。结合现场实例,分别进行了2种渗透率场条件下的压力恢复试井曲线拟合,并与常规模型拟合情况进行了对比,新模型能够解释试井恢复曲线异常段出现的原因,拟合得到更加符合实际的储层和压裂改造参数。
[Abstract]:Volume fracturing is a key technology for the development of tight and shale gas reservoirs. In the study of well test interpretation and productivity evaluation, the seepage mathematical model of the complex heterogeneity induced permeability field in the fracture volume (SRV) is still lacking in the study of well test interpretation and productivity. The induced permeability field model is established, which is coupled with the seepage field, and the mathematical model of the multi section fractured horizontal well seepage flow is created with the linear flow model. The pressure solution of the real space is obtained by the Bessel function theory and the GWR numerical inversion algorithm. The pressure dynamic curve of the gas well is drawn and the distribution of the induced permeability in the SRV zone is analyzed. The effect of the characteristic parameters on the pressure change law of the gas well shows that the dynamic curve of the gas well pressure dynamic curve appears prematurely in the boundary response characteristic when the permeability of the SRV zone is subtraction, and the transition section of the gas well production dynamic curve will appear flat or concave before the boundary reaction section, and it is easily mistaken as the radial flow order. In combination with field examples, the fitting of pressure recovery test curves under 2 permeability field conditions is carried out respectively, and compared with the conventional model fitting, the new model can explain the causes of the abnormal section of the well test recovery curve, and the fitting gets more actual reservoir and fracturing parameters.

【作者单位】：页岩油气富集机理与有效开发国家重点实验室;中国石化石油勘探开发研究院;
【基金】：国家科技重大专项“涪陵页岩气勘探开发示范工程”子课题“涪陵页岩气气藏工程技术示范”(编号:2016ZX05060-002) 页岩油气富集机理与有效开发国家重点实验室开放基金“考虑复杂缝网的页岩气多段压裂水平井产能半解析预测方法”(编号:GSYKY-B09-33)联合资助
【分类号】：TE332

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