Abstract:According to conventional tubing plugging device size generally larger, the plugging effect is poor, and prone to downhole tools blocked situation or under well tool action is not flexible problem, the development of the new small diameter hydraulic plug. The plug through the wire operation to seal the tubing, block the hydraulic plug to control the flow of fluid inside the pipe, to ensure that the plug is smooth and the action is flexible, reliable sealing. The results show that, the plug can withstand pressure of 35MPa, temperature of 70, the smooth realization of releasing, sealing and salvage.