Technology of fluid pulse recovery of injection wells injectivity
The technology is based on raising wellhead pressure up to 5...10 MPa, followed by its sharp release to atmospheric values with simultaneous opening of the gate valve for flow. After the sharp opening, the discharge wave in the liquid reaches bottomhole zone, is reflected and again comes to the wellhead in the form of a pressure pulse. Then, pressure pulses are repeated, gradually fading in time. The next pulse passing requires sharp pressure increase at the wellhead by means of special cranes and container with pressurized inert gas. Sharp pressure increase is followed by its sharp drop. The paper discusses the research carried out by direct measurement of the wellhead and bottomhole pressure, confirming the wavelike nature of the pressure change. Shock wave slamming, performed directly from the wellhead, differs greatly from implosion technology. The point is that application of implosion technology requires lifting of the column to replace the membrane or broken capsule after each single shock action.