RESEARCH AND APPLICATION OF THE TECHNOLOGY OF PLUG AND ACID REMOVAL THROUGH PRESSURE DECREASING

In order to solve problems such as near well bore plug resulted from poor water injected and various kinds of remaking measures, poor acid discharge effect after acidizing and so on, a technology was studied based on jet principle, which, through pressure decreasing, not only could remove the formation plug, but also could discharge acid into wells. This paper introduced the special structure of tools,. down-hole strings, well selecting conditions, working mechanism and field application results. The field application showed that the technology could effectively drain off near well bore residual acid, acid reaction product and various kinds of plugging impurity, and thus improved permeability of the formation.