Abstract: A depressurization device for downhole annulus drilling fluid includes a central shaft and a barrel body sheathed outside the central shaft, the central shaft includes a force transmission shaft and a liquid separation piston; the barrel body includes a spline barrel, an elastic element protection barrel, a connector and a depressurization barrel; the elastic element protection barrel and the connector are sheathed outside the force transmission shaft; an elastic element is arranged between the elastic element protection barrel and the force transmission shaft; the depressurization barrel is sheathed outside the liquid separation piston; a first liquid storage chamber and a second liquid storage chamber are formed; a first inlet passage and a first drain passage are formed on the connector; a second inlet passage and a second drain passage are formed on the depressurization barrel; suction valves are arranged on the first inlet passage and the second inlet passage; and, second drain valves are arranged on the

Abstract: A weight-on-bit self-adjusting drill bit includes a reaming bit, a WOB adjusting element, a transmission mechanism and a pilot bit and a pulsating impact generating mechanism; the pulsating impact generating mechanism includes a centralizing element, a driving element, a rotating element and a throttling element which are placed and connected successively, the centralizing element, the driving element and the rotating element are connected successively, the throttling element is in clearance fit with the rotating element, both of the centralizing element and the throttling element are respectively provided with a flow-through passage for the drilling fluid to flow through, the driving element drives the rotating element to rotate, the rotating element rotates relative to the flow-through passage on the throttling element.

Abstract: The present application relates to a weight-on-bit self-adjusting drill bit, namely a pulsed jet type weight-on-bit self-adjusting drill bit, comprising a reaming bit, a WOB adjusting element, a transmission mechanism and a pilot bit and a pulsating impact generating mechanism; the pulsating impact generating mechanism comprises a centralizing element, a driving element, a rotating element and a throttling element which are placed and connected successively, the centralizing element, the driving element and the rotating element are connected successively, the throttling element is in clearance fit with the rotating element, both of the centralizing element and the throttling element are respectively provided with a flow-through passage for the drilling fluid to flow through, the driving element drives the rotating element to rotate, the rotating element rotates relative to the flow-through passage on the throttling element.

Abstract: A system for improving a drilling speed by using drill string vibration comprises a downhole drill string vibration-reduction and supercharging device, and an ultra-high pressure bit device used for a downhole supercharger. Also disclosed is a method for improving a drilling speed by using drill string vibration. Related embodiments are also disclosed.

Abstract: A system for improving a drilling speed by using drill string vibration comprises a downhole drill string vibration-reduction and supercharging device, and an ultra-high pressure bit device used for a downhole supercharger. The downhole drill string vibration-reduction and supercharging device comprises a high-pressure runner (16). The ultra-high pressure bit device used for the downhole supercharger comprises an ultra-high pressure drilling fluid transmission runner. The ultra-high pressure drilling fluid transmission runner comprises an ultra-high pressure drilling fluid runner (25), a high-pressure resisting hose (28) and a high-pressure resisting rigid tube (30).