深圳大学学报理工版

运用Green函数和Newman积原理,建立盒式油藏水平井产量计算模型.模型考虑井筒内的沿程摩擦阻力和加速度压力损失,引入拟表皮系数表征储层非均质性造成的物性差异.实例计算结果表明,该模型与有限差分数值模拟模型计算结果吻合较好,证实了该方法的可靠性; 储层非均质性和沿程压降对水平井产量剖面影响较大,渗透率高的区域,流入量较大; 在早期,原油的流动为非稳态时,井筒压降对计算结果影响很大,当水平井较长时,井筒压降对产量影响不可忽略; 由于井筒流量从趾端到跟端逐渐增加,井筒压降逐渐增大.

Based on Green's function and the Newman product principle, we present a model to calculate horizontal well deliverability in a box-shaped reservoir. In this model, we take into account the friction along the wellbore and acceleration pressure loss, and introduce a pseudo-skin factor to represent the reservoir property differences due to reservoir heterogeneity. The result accords with that of the finite difference numerical simulation model, which further confirms the reliability of our method. Simulation results show that reservoir heterogeneity and pressure drops along the horizontal wellbore have significant impact on the flow rate distribution. The higher the permeability is, the greater the inflow. At the early transient state, the oil flow is unstable, and the wellbore pressure drop has a great effect on the flow rate. When the horizontal well is long, the influence of wellbore pressure drop on production is non-negligible. Because of the increment of flow rate from the toe to the heel of the wellbore, the wellbore pressure drop gradually increases.

引言
1 数学模型建立
2 有限导流模型
3 应用实例
4 结语

图1 非均质油藏中的水平井流入模型<br/>Fig.1 (Color online)Inflow model of horizontal wellbore in heterogeneous reservoir

图1 非均质油藏中的水平井流入模型
Fig.1 (Color online)Inflow model of horizontal wellbore in heterogeneous reservoir

图2 表皮系数表征储层非均质性<br/>Fig.2 (Color online)Heterogeneity description by skin factor

图2 表皮系数表征储层非均质性
Fig.2 (Color online)Heterogeneity description by skin factor

图3 渗透率及第1段生产时拟表皮系数沿井筒的分布<br/>Fig.3 (Color online)Permeability and pseudo-skin factor(caused by the first segment production distribution)distribution along the wellbore

图3 渗透率及第1段生产时拟表皮系数沿井筒的分布
Fig.3 (Color online)Permeability and pseudo-skin factor(caused by the first segment production distribution)distribution along the wellbore

图4 不同模型计算结果对比<br/>Fig.4 (Color online)Comparison of different reservoir models

图4 不同模型计算结果对比
Fig.4 (Color online)Comparison of different reservoir models

图5 摩擦阻力对水平井流量的影响<br/>Fig.5 (Color online)Effect of friction on horizontal well flow rate

图5 摩擦阻力对水平井流量的影响
Fig.5 (Color online)Effect of friction on horizontal well flow rate

图6 分段井筒压降及井筒压力曲线<br/>Fig.6 (Color online)Distribution curve pipe flow pressure drop of different segments and pressure

图6 分段井筒压降及井筒压力曲线
Fig.6 (Color online)Distribution curve pipe flow pressure drop of different segments and pressure

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备注

引言

1 数学模型建立

2 有限导流模型

3 应用实例

4 结语

期刊信息

备注

引言

1 数学模型建立

2 有限导流模型

3 应用实例

4 结 语

期刊信息

4 结语