王牧 冉旺 曹鹏程(中石油长庆油田分公司第十二采油厂， 甘肃 合水 745400)

致密储层体积压裂井数值试井方法研究

王牧 冉旺 曹鹏程(中石油长庆油田分公司第十二采油厂， 甘肃 合水 745400)

长庆油田大规模开展了以封隔器滑套分层压裂技术、双封单压分段压裂技术为主体的体积压裂工艺措施，体积压裂工艺技术的进步带动了试井方法理论的发展。文章以“单孔双区”和“双孔双区”物理模型为基础，基于PEBI网格技术分别建立了体积压裂井的两种数值试井模型，求解后获得了两种模型的双对数压力响应特征曲线，并对两种模型的数值解和解析解进行了比对分析，高度吻合的结果验证了数值模型的准确性，同时对现场测试资料未能显示第二径向流段做出了理论解释，文章最后通过对体积压裂井周围三维压力场分布特征的研究，确定了压力波的传播规律，得出了影响油井产量的一个主要因素是改造区内压力的扰动幅度。矿场的拟合效果肯定了该方法的实用性。

体积压裂；渗流理论；数值试井；三维压力场；特征曲线

Stimulated reservoir volume(SRV) treatment,mainly the layered fracturing technology by packer sleeve and double seal single pressure staged fracturing technology,were widely used in Changqing Oil Field.The improvement of SRV leads to the development of well testing theory.Based on the physical model of radial composite and double-porosity double-zone,two kinds of numerical well testing model of SRV wells was established by PEBI grid technology in this paper.The log-log pressure response characteristic curves of two models could be observed through model solving.CoMParison of numerical and analytical solution between two kinds of models shows considerably similar and reliable results.Further,a theoretical explain was given for field testing data’s lack of the second radial flow.In the last section of paper,we analyzed the distributing characteristics of 3D pressure field surrounding the SRV wells.Expanding pattern of pressure was established.It is revealed that pressure disturbance in stimulating area is a main factor to well production.Perfect match on field confirmed practicability of this new method.

长庆油田借鉴美国储层改造经验，首次将储层改造技术引入国内低渗透油藏，并赋予了新的名称“体积压裂”，作为一个新概念的引入，体积压裂井渗流机理研究目前尚少，2012年姜瑞忠、蔡振华等人分别提出了低渗透油藏压裂井生态动态分析方法和致密气藏压裂井的产能评价方法[1-2]；2013年王建忠、姚军等人建立了裂缝性低渗透油藏的试井模型[3]；……