Patent ID: 7025134

Claim:
A system for applying a pressure pulse to a subterranean formation, comprising: means for continually injecting a fluid into the subterranean formation; and means for periodically applying a pressure pulse having a given amplitude and frequency to the fluid while the fluid is being injected into the subterranean formation; wherein: the injection means and pressure pulsing means are located at about, or above, the earth's surface; and the pressure pulsing means comprises: a housing; a plunger disposed in the housing, wherein the plunger has a hollow chamber in fluid communication with the fluid injection port through openings in the surface of the plunger, and the hollow chamber is in fluid communication with the outlet port through a plunger outlet; a power source for moving the plunger within the housing; a fluid injection port through which the fluid is supplied into the housing; and an outlet port through which the fluid exits the housing.