The success research of high efficiency milling washover head provides a new way for fishing pipes. this tool has been applied successfully in well 3-251,3-153 of zhongyuan oilfield.

• 高效铣削式套铣头的研制成功为钻杆的打捞提供了新的途径。该工具已在中原油田3-251井、3-153井应用成功。