砂岩油藏水平井见水后增产措施确定方法

Determination Method of Stimulation Measures after Water Breakthrough of Horizontal Wells in Sandstone Oil Reservoirs

针对水平井见水后增产措施难以确定的问题,基于考虑重力作用的剖面压力均等模型和砂岩油藏储层渗透率对数正态分布特点,建立了一种砂岩油藏水平井见水诊断曲线。研究表明,该曲线反应了砂岩油藏水平井最为普遍的见水规律,能有效指导水平井见水后增产措施的选择。将研究成果应用于渤海J油田A41H井及A9H井,A41H井2014年1月实施堵水作业后,含水率下降到80%以下,日产油量约增加50m^3/d;A9H井2014年7月采取提液措施后,日产液量增加150 m^3/d,日产油量增加30 m^3/d。研究成果对砂岩油藏水平井见水后增产措施的确定有一定的指导意义。

It is difficult to determine which stimulation measures shall be taken after water breaks through in hori- zontal wells. To solve this problem, a kind of water breakthrough curve for horizontal wells in sandstone oil reser- voirs was established based on the profile pressure equalization model which covers gravity and the logarithmic nor- mal distribution characteristics of reservoir permeability of sandstone oil reservoirs. It is indicated that this curve shows the most common water breakthrough laws of horizontal wells in sandstone oil reservoirs, and it can be used as the guidance for the selection of stimulation measures after water breakthrough in horizontal wells. The research results were applied in Wells A41H and A9H in Bohai J Oilfield. After water shutoff was conducted in Well A41H in January 2014, its water cut dropped to less than 80% and oil production rate rose by 50 m3/d. After liquid lifting was carried out in Well A9H in July 2014, its liquid production rate and oil production rate rose by 150 m3/d and 30 m3/d, respectively. The research results can be used as the reference for the determination of stimulation meas- ures after water breakthrough of horizontal wells in sandstone oil reservoirs.