Vacuum type hydraulic pumping positive displacement pump

The utility model discloses a vacuum type hydraulic draw -off pump, it includes by the last power cylinder top connection that connects gradually under to, power cylinder, seal cover, compression packer, working cylinder top connection, vacuum working cylinder and the synchronous plunger pump of arranging a little, be equipped with power piston in the power cylinder, be equipped with the vacuum piston in the working cylinder of vacuum, power piston and vacuum piston are connected through hollow connecting rod, the seal cover suit on hollow connecting rod and the separation intercommunication of power cylinder and vacuum working cylinder, it includes the plunger in step to arrange the plunger pump a little, sealing joint under reset spring and the working cylinder that connects gradually, the annular coupling, oil pipe short circuit and oil pipe short circuit plug, oil pipe short circuit plug middle part is equipped with the plunger pump valve, the plunger passes sealing joint and plunger plug rigid coupling under the working cylinder, reset spring is located under plunger and the working cylinder between the sealing joint. The utility model discloses realize quick flowing back in succession after can making formation testing test and acidizing fracturing, avoid the stratum injury, improve effect and efficiency.