The invention provides a downhole
pressurizer and a downhole pressurization method. The downhole
pressurizer at least comprises a
check valve, an upper connector, an outer
barrel, a core shaft and a lower connector, wherein the
check valve is used for being connected with pressure fluid, the upper connector is connected to the lower end of the
check valve, the outer
barrel is fixedly connected to the lower end of the upper connector, the core shaft is arranged in the outer
barrel in a penetrating mode, the upper end of the core shaft is connected with the inner wall of the outer barrel in a sliding mode through a hollow
piston, and the lower connector is used for being connected with the lower end of the core shaft and a
nozzle. The downhole pressurization method includes the steps that the weight of a
drill stem is pressurized to the
piston, a drilling tool is pressurized to the upper connector, the outer barrel is driven to move downwards relative to the core shaft, the distance between the
piston and the upper connector is shortened accordingly,
slurry inside the core shaft is compressed, and therefore the
slurry is sprayed at a
nozzle at a higher flow rate. According to the downhole
pressurizer and the downhole pressurization method, the weight of the
drill stem can be converted into bit pressure, pressure of original circulating fluid before flowing out of a bit
nozzle is multiplied, damage to the stratum is accelerated, and the speed of a drilling
machine is improved.