水平井多段压裂非常规裂缝压力动态特征

流、第二线性流、过渡流和系统径向流阶段；不对称因子主要影响双线性流阶段持续时间的长短；裂缝导流系数主要
影响双线性流阶段和早期线性流阶段井底压力及压力导数曲线特征，导流能力越大，双线性流阶段井底压力导数曲
线特征越不明显。
关键词：水平井；多段压裂；非常规裂缝；有限导流垂直裂缝；压力动态特征
中图分类号：TE312
(1.Yulin University, a.School of Chemistry and Chemical Engineering; b.School of Life Science, Yulin, 2.No. 2 Gas Production Plant, Changqing Oilfield Company, PertroChina, Yulin, Shaanxi 719000, China)
王镜惠 1a，梅明华 2，梁正中 1a，王华军 2，刘娟 1b
（1.榆林学院 a.化学与化工学院；b.生命科学学院，陕西 榆林 719000；2.中国石油 长庆油田分公司 第二采气厂，陕西 榆林 719000）
摘 要：为了解决复杂地层压裂过程中裂缝关于井筒不对称的试井解释问题，通过点源函数基本理论，建立有限导流
文献标识码：A
Dynamic Pressure Characteristics of Unconventional Fractures during Multi⁃Staged Fracturing in Horizontal Wells
WANG Jinghui1a, MEI Minghua2, LIANG Zhengzhong1a, WANG Huajun2, LIU Juan1b
垂直裂缝试井解释数学模型，利用压降叠加原理获得水平井多段压裂非常规裂缝试井解释模型，采用积分变换获得
该模型的半解析解。对压裂裂缝进行数值离散，结合半解析解与杜哈美原理，根据 Stehfest 数值反演方法绘制考虑井
储和表皮效应的井底压力及压力导数曲线。研究表明：该模型总体上划分为井储、双线性流、早期线性流、第一径向
第 39 卷 第 1 期 2018 年 2 月
文章编号：1001-3873（2018）01-0097-07
新疆石油地质 XINJIANG PETROLEUM GEOLOGY
DOI：10.7657/XJPG20180113
Vol. 39，No.1 Feb. 2018
水平井多段压裂非常规裂缝压力动态特征
Abstract: To solve the problem of well test interpretation of fracture asymmetry during fracturing in the complicated strata, based on the ba⁃ sic theory of point⁃source function, a mathematics model for well⁃test interpretation of finite⁃conductivity vertical fractures was established, then a well⁃test interpretation model of the unconventional fracture during multi⁃staged fracturing in horizontal wells was obtained by using pressure drop superposition principle, and the semi⁃analytical solution of the model was obtained with integral transformation. The frac⁃ tures were discredited numerically, and combined with the semi⁃analytical solution and Duhamel principle, bottom hole pressure and pres⁃ sure derivative curves considering the wellbore storage and skin effects were mapped on the basis of Stehfest numerical inversion. The re⁃ sults showed that the model included wellbore storage stage, bilinear flow stage, early linear flow stage, first radial flow stage, second linear flow stage, transitional flow stage and systematic radial flow stage; asymmetric factor mainly had an influence on time length in the bilinear flow stage; fracture perveance mainly affected the characteristics of downhole pressure and pressure derivative curves in bilinear flow stage and early linear flow stage, and the greater the flow conductivity was, the more unobvious the characteristic of downhole pressure derivative curves in the bilinear flow stage would be. Keywords: horizontal well; multi⁃staged fracturing; unconventional fracture; finite⁃conductivity vertical fracture; dynamic pressure charac⁃