水平井筒内压降对水平井向井流动态关系的影响

EFFECT OF PRESSURE DROP IN HORIZONTAL WELL ON FLUID FLOW IN/NEAR IT

刘想平 蒋志祥 江如意 刘翔鹗

Liu Xiangping Jiang Zhixiang Jiang Ruyi Liu Xiang’e

清华大学, 北京 100084 石油勘探开发科学研究院, 北京 100083

建立了考虑水平井筒内压降影响的水平井向井流动态关系模型,为油藏工程和采油工程预测水平井真实的向井流动态关系提供了必要的手段。通过实例计算,分析了水平井筒内压降对水平井向井流动态关系的影响。分析表明:当水平井筒内压降较大时,即使油层和整个水平井筒内全部为单相原油流动,水平井的IPR曲线也不再为一条直线,而是一条曲线。井筒内压力损失越大,单相液流IPR曲线的这种背离直线的现象越明显;对于有底水或气顶的油藏,应适当增加水平井筒直径,以降低水平井筒内压降,从而延缓底水或底气的锥进。

This paper establishes a model simulating the fluid flowing toward or in the horizontal well based on the consideration of the effect of pressure drop in the horizontal well, thus has provided a necessary means for reservoir engineer or production engineer to predict the fluid flow in/near horizontal well. The case analysis indicates:when the pressure drop is serious in the horizontal wellbore, even if the single phase oil flow is presented in the reservoir or in the whole wellbore, the IPR curve is never a straight line, but a curve. The more serious the pressure drop, the more curving the single phase oil flow IPR curve is. For the reservoir with bottom water or gas cap, the diameter of the horizontal well must be increased properly, so as to reduce the pressure drop in the wellbore and delay the coning of water or gas.Subjectheading ho

10.3969/j.issn.1000-7393.2000.01.011