USE OF NEUTRON GENERATORS FOR MONITORING THE INCREASE IN PETROLEUM RECOVERY FROM WELLS DUE TO ULTRASONIC ACTION

摘要

The decrease in petroleum output from a well due to degradation of the permeability in the extraction zone of the productive fluid is a frequent negative phenomenon which occurs when a deposit is being developed. This effect is inevitable, since the extraction zone of the productive fluid operates as a filter, retaining and accumulating during well operation all possible impurities in the pores of the formation. One of the most effective methods for cleaning the extraction zone is to expose it to a longitudinal ultrasonic pressure wave. In so doing, nonstationary oscillating microflows appear in the fluid-filled pores in the formation. If the acoustic field is strong enough, these microflows can promote the removal of these impurities from the fluid extraction zone. In this case, the petroleum output from the well should increase. In addition, ultrasonic action on the formation and the space around the well is very likely to cause water to flow into the well from behind the main shaft of the well, resulting in the displacement of the water-petroleum contact and other undesirable and difficult-to-control effects.