Abstract: A downhole power drilling tool includes a flow distribution shaft, an outer pipe and a multi-stage eccentric gear driving mechanism which are coaxially arranged, the flow distribution shaft is suspended and supported in the outer pipe by the multi-stage eccentric gear driving mechanism.

Abstract: This application provides an all-metal downhole power drilling tool based on a multi-stage dual plunger eccentric gear mechanism, which includes a flow distribution shaft, an outer pipe and a multi-stage eccentric gear driving mechanism which are coaxially arranged, the flow distribution shaft is suspended and supported in the outer pipe by the multi-stage eccentric gear driving mechanism. This application provides a novel rotary plunger type power drilling tool hydraulically driven by drilling fluid. The plunger structure is high in processing precision, low in cost and good in plunger type movable sealing effect. A planetary gear train with an eccentric structure is adopted to transmit torque, improving the working efficiency of the power drilling tool. The power drilling tool driven by the multi-stage dual plunger eccentric gear mechanism is of an all-metal structure and can withstand a high temperature environment.