Patent ID: 10648239

Abstract:
The present technology is a downhole pulsation system for reducing friction on a drill string by generating pressure pulsations. The system includes a valve housing attachable to the drill string, and includes a housing bore for passage of fluid. A lobed insert is fittable inside the valve housing, and includes an insert bore for passage of fluid, and a lobe extending therein. A mandrel cap includes a cap bore therethrough, and at least one port in communication with the cap bore. The mandrel cap has a portion rotatably receivable in the insert bore so that the port is alignable with the lobe. A drive linkage connects the mandrel cap to a rotor of a rotor/stator drive. Fluid flow is intermittently allowed to pass from the insert bore through the port upon rotation of the mandrel cap by the rotor. Pulse frequency is controllable by changing the lobe insert or sleeve.