- 
              Multiple Drop Ball Circulating SubThe Multiple Drop Ball Circulating Sub is a high-performance downhole tool designed for directional, horizontal, and high-angle drilling operations. It enables repeated opening and closing of bypass ports to enhance drilling efficiency, reduce well control risks, and facilitate special operations like lost circulation control and wellbore cleaning—without tripping out. 
 
				





 
             Room 703 Building B, Greenland center, Hi-tech development zone Xi’an, China
            Room 703 Building B, Greenland center, Hi-tech development zone Xi’an, China
           86-13609153141
            86-13609153141
           
           
            