存在直线断层的复合模型试井曲线特征研究

发布时间：2018-04-21 08:33

本文选题：复合油气藏 + 试井分析　；参考：《西南石油大学学报(自然科学版)》2017年04期

【摘要】：鲜有文献报道井附近存在直线断层(尤其是断层位于复合油气藏内区)对试井解释的影响,因此,从渗流力学理论出发,首先建立考虑表皮和井筒储集的无限大地层两区径向复合油气藏试井解释数学模型,并通过拉氏变换对模型进行求解,再利用镜像反映原理和叠加原理研究存在直线断层的复合油气藏的无因次井底压力及压力导数曲线特征及影响因素。研究表明,当井到断层距离小于1/2内区半径时,无因次压力导数曲线将由无限作用径向流的0.5水平线变为内区受断层影响的1.0水平线和外区受断层影响的值为M_(12)水平线;当井到断层距离大于1/2内区半径时,无因次压力导数曲线将由无限作用径向流的0.5水平线变为反映外区特征的值为M_(12)水平线和反映外区受断层影响的值为M_(12)的水平线。
[Abstract]:It is rarely reported that there are linear faults near wells, especially the faults located in the inner region of composite reservoirs, which affect well test interpretation. Therefore, based on the theory of percolation mechanics, Firstly, a mathematical model of well test interpretation of radial composite reservoir in infinite formation with skin and wellbore reservoir is established, and the model is solved by Laplace transform. The characteristics and influencing factors of dimensionless bottomhole pressure and pressure derivative curves of composite reservoirs with linear faults are studied by using mirror reflection principle and superposition principle. The results show that when the distance from well to fault is less than 1 / 2 radius of internal region, dimensionless pressure derivative curve will change from 0.5 horizontal line of infinite radial flow to 1.0 horizontal line affected by fault in internal region and Mappa 12 horizontal line to outer zone affected by fault. When the distance from well to fault is greater than 1 / 2 inner radius, the dimensionless pressure derivative curve will change from 0.5 horizontal line of infinite radial flow to M _ T _ 12) horizontal line reflecting the characteristics of outer area and to M _ T _ 12) line reflecting the influence of fault on outer area.
【作者单位】：西南石油大学石油与天然气工程学院;中国石油渤海钻探工程有限公司第二录井分公司;
【基金】：国家科技重大专项(2017ZX05009004-004);国家科技重大专项(2016ZX05015003-003-001)
【分类号】：TE353

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