致密气藏水平井压裂缝不均匀产气试井分析

发布时间：2018-10-30 11:30

【摘要】：现场测试资料表明,压裂水平井部分裂缝产气量很小,甚至不产气,但现有试井模型几乎都未考虑其对试井解释的影响。因此,采用源函数、纽曼乘积方法建立了水平井压裂裂缝不均匀产气试井模型,通过数值反演得到了考虑井筒存储和表皮效应的井底压力解,绘制了水平井压裂裂缝不均匀产气试井典型图版,并研究了各裂缝产气量、裂缝半长、裂缝数量、裂缝间距和裂缝导流能力对压力动态特征的影响。水平井压裂裂缝均匀产气和不均匀产气在试井典型图版上呈现出不同特征。缝间干扰越小,早期径向流越明显,且在压力导数曲线上表现为约等于0.5/N的水平段。致密储层渗透率小,测压资料难以反映出系统径向流特征,如果把早期径向流当作系统径向流解释会导致解释出的渗透率与真实值存在约N倍的差异,因此在致密气藏试井解释中应该考虑不均匀产气对压力响应特征的影响,准确识别早期径向流阶段。最后给出了压裂裂缝不均匀产气的参数解释方法,为更细致地评价水平井压裂裂缝产气能力提供了借鉴。
[Abstract]:The field test data show that the gas production in fracturing horizontal wells is very small or even does not produce gas, but the existing well test models almost do not consider its influence on well test interpretation. Therefore, using source function and Newman product method, the well test model of fractured uneven gas production in horizontal wells is established, and the bottomhole pressure solution considering wellbore storage and skin effect is obtained by numerical inversion. The typical chart of gas production test of fractured fracture in horizontal well is drawn, and the effects of gas production rate, half length of fracture, number of fractures, fracture spacing and fracture conductivity on the pressure dynamic characteristics are studied. The uniform and uneven gas production of fractured fracture in horizontal well shows different characteristics on the typical chart of well test. The smaller the interseam interference is, the more obvious the early radial flow is, and the pressure derivative curve shows a horizontal section equal to about 0.5% N. The permeability of the tight reservoir is small, and the pressure measurement data can not reflect the radial flow characteristics of the system. If the early radial flow is interpreted as the radial flow of the system, it will lead to the difference between the permeability explained and the true value about N times. Therefore, the influence of non-uniform gas production on pressure response characteristics should be considered in the well test interpretation of tight gas reservoirs, and the early radial flow stage should be accurately identified. Finally, the parameter interpretation method of uneven gas production of fracturing fractures is given, which provides a reference for more detailed evaluation of gas production ability of fractured fractures in horizontal wells.
【作者单位】：中国石化海相油气田开发重点实验室;中国石油大学(北京)油气资源与工程国家重点实验室;中国石油大学(北京)石油工程教育部重点实验室;
【基金】：中国石化海相油气田开发重点实验室基金项目“致密气藏压裂井不均匀产气试井解释模型及方法研究”(编号:G5800-15-ZSWX057)资助
【分类号】：TE373

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