Investigation of the permeability build-up method in the bottom-hole zone of the pay zone

Abstract

In oil wells, the bottomhole formation zone is subjected to various influences during drilling, development and operation. The porous medium of the bottomhole zone is clogged by heavy components of the produced products and rock particles, reducing permeability and production. Various technologies are used to restore bottomhole permeability. A new method has been developed, including injection of a composition containing aqueous sodium bicarbonate solution with the addition of a chemical reagent, light oil and an acid solution into the formation. The essence of the acid treatment new method of heterogeneous terrigenous formations is that high permeable zones are blocked by a foam system, and injection of acid solution activates low-permeable zones. The new method developed in laboratory conditions was tested in field conditions. The test results showed that the set objectives were achieved.