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通过分析压力试井数据来确定油层的渗透率、孔隙度、平均压力和井的完善程度,国内外早已有多种方法在广泛应用。这些方法都建立在非稳态流基础上,适用于井完全穿透油层,井筒与油层上下边界垂直的直井。但从油藏角度观察,对于油层法线与井轴线成一定角度的斜井,如垂直井穿越倾斜油层或定向井穿透水平油层的情况,就是本文所要讨论的。对于斜井,目前还没有见到相应的试井理论和分析方法来确定油层和完井的有关数据。有的文献指出了用电模拟的方法研究完全穿透油层的斜井,在稳定流情况下的处理结果。主要指完全穿透油层的斜井导致油井产量增加,原因是生产层段的渗流面积增大,相当于井底周围渗流阻力减小,这意味着由于井的倾斜,井底产生了负的表皮效应。以上是指在较理想的条件下,而对于斜井的非稳态流情况将有所不同。一般是通过定向井的试井资料,用直井试井的解释方法求得一个视表皮因子;然后,用斜井无限板状油藏模型,确定由于井倾斜产生的拟表皮因子;而求出油层真表皮因子。以此判断斜井的油层污染程度,指导斜井现场改造措施,提高油井产量。
By analyzing pressure well test data to determine the permeability, porosity, average pressure and well completion, many methods have been widely used at home and abroad. These methods are based on non-steady-state flow, based on the well completely penetrated the reservoir, the wellbore and the upper vertical wells vertical boundaries. However, from the point of view of reservoirs, we will discuss the case where the normal of the reservoir is at an angle to the axis of the well, such as vertical wells penetrating inclined reservoirs or directional wells through horizontal reservoirs. For deviated wells, no corresponding well test theory and analytical methods have yet been found to determine the relevant data of oil reservoirs and completions. Some literatures point out that the method of electrical simulation is used to study the fully penetrated inclined wells and the results of the treatment under steady flow conditions. Mainly refers to fully penetrate the oil well inclined wells led to increased production wells, because the production section of the seepage area increases, equivalent to the seepage resistance around the bottom of the hole decreases, which means that due to the inclination of the well, the bottom of the hole produced a negative skin effect. The above is in the ideal conditions, while the non-steady-state flow of inclined wells will be different. Generally, a visual skin factor is obtained through the well test data of a directional well and an interpretation method of a vertical well test. Then, an indentation plate model of an inclined shaft is used to determine the quasi-epidermal factor due to the inclination of the well. The oil layer True epidermal factor. In order to determine the inclined wells of the reservoir contamination, to guide the on-site transformation of inclined wells to improve oil production.