A METHOD FOR COMBINED CLEANING AND PLUGGING IN A WELL AND A FLUSHING TOOL FOR FLUSHING IN A WELL

摘要

A method for the combined perforation, cleaning, and the subsequent plugging of a longitudinal section (LI) of a well (1), the well (1) being provided with two pipe bodies (5, 7) placed substantially concentrically, and the method including the following steps: (A) lowering a perforation tool (31) into the innermost pipe body (5) to said longitudinal section (LI); (B) forming perforations (51, 71) in both pipe bodies (5, 7) along the longitudinal section (LI) by means of the perforation tool (31); (C) cleaning said longitudinal section (LI) by means of a flushing tool (33) which is attached to a lower portion of a string (3) allowing through-flow; (D) pumping a fluidized plugging material (37) down the string (3) and into the innermost pipe body (5) at the longitudinal section (LI); and (E) placing the fluidized plugging material (37) in the innermost pipe body (5), and thereby also into the entire cross section of the well (1) via the perforations (51, 71) within the longitudinal section (LI). A flushing tool (33) for cleaning said longitudinal section (LI) of the well (1) is described as well.