Selective water plugging method for loose sandstone reservoir oil well

The invention discloses an oil well selective water plugging method for a loose sandstone reservoir, which comprises a water plugging method integrating oil well selection conditions, particle selective water plugging agent preparation, water plugging radius and water plugging agent dosage design, injection mode optimization design and the like, and is characterized in that a plugging agent selectively enters a high-permeability water flooded layer section to protect a low-permeability oil layer; and the purpose of stabilizing oil and reducing water is achieved by changing the oil-water seepage relation in the layer. 本发明公开了一种疏松砂岩油藏油井选择性堵水方法，该方法包括油井选井条件、颗粒选择性堵水剂的制备、堵水半径和堵水剂用量设计、注入方式优化设计等于一体的堵水方法，通过堵剂选择性进入高渗透水淹层段，保护低渗油层，改变层内油水渗流关系，达到稳油降水的目的。