裸眼系列完井方式对鱼骨井产量的影响

为了给分支水平井完井方案提供理论依据,引进"完井方式"因素,以鱼骨井为例,以一种离散化方法为手段,以裸眼系列完井方式为核心,建立起相应的稳态耦合流动计算模型。通过实例计算绘制出流率分布剖面、流压分布剖面及全井流入动态曲线,并对比了裸眼完井方式下不同完井方法对应的总产量。研究结果表明,鱼骨井内部的渗流干扰对总产量有抑制作用,渗流干扰的强烈程度取决于鱼骨井形态、渗流阻力和开采强度;完井方式对鱼骨井的流率分布和流压分布都有影响,其本质在于完井筛管影响了油藏渗流压降和井筒管流压降,进而改变了模型的耦合结果。在进行方案设计时应综合技术和经济等各方面因素选择完井筛管及其下入模式。

A deliverability analysis of herringbone well under open hole series completion system

In order to offer reference to completion decision making for horizontal multilateral wells, the open hole series completion system are considered as a main research object in a new deliverability forecasting model. This model, which takes herringbone well for an example, couples reservoir inflow with wellbore flow and is soluted with a semi-analytical discretization theory. As a result of iterative operation, distribution profile of flow rate and flowing pressure as well as IPR curve of whole well are obtained. What’s more, production under different completion methods is compared with each other. Through analysis and study, it’s known that, firstly, seepage interference within multilateral well restrain total production, whose degree depends on herringbone well configuration, filtrational resistance and mining intensity. Secondly, completion system influences both flow rate distribution and flowing pressure distribution because completion screen pipe in the well bore affects drawdown of reservoir inflow and wellbore flow. Finally, well completion screen pipe and its running model should be selected based on technical and economic aspects.