水平井不稳定试井分析理论及应用

Theory and Application of Non-stabilized Well Testing Analysis for Horizontal Well

水平井在增加原油可采储量、提高产量、减少开采成本及稳定油价等方面有着重要的战略意义和现实效益。水平井的渗流理论与直井相比要复杂得多,因为研究水平井的渗流问题必须考虑三维介质、六个外边界面、有汇区分布情形。归纳、求解水平井的不稳定渗流数学模型和设计并实现其应用算法是水平井渗流理论的两个难点。水平井试井分析是水平井渗流理论的一个重要应用。为此,在前人理论基础上详细推导了水平井试井理论模型及其解,详尽分析了水平井试井理论曲线特征,并用实测资料进行了验证,得到了满意的解释结果。

With the application of horizontal wells, we can increase the recoverable oil reserves and oil production, decrease production cost and stabilize oil price, so, horizontal wells have strategic and real meaning to us. The filtration theory of horizontal wells is more complicated than that of vertical wells, because 3D medium, 6 outer interfaces, and other factors must be considered when studying the filtration problems of horizontal wells. There are two difficulties for the filtration theory of horizontal wells: resolution of non-stabilized mathematical model for horizontal wells, and design and application of the model. The filtration theory is applied to horizontal well testing analysis significantly. In this paper the theoretical model for horizontal well testing is derived based on former theories, and the curve characteristics for horizontal well testing theory is analyzed in detail. Based on the field data it can be found that the interpretation results are satisfying.