Method for combined cleaning and plugging in a well, a washing tool for directional washing in a well, and uses thereof

摘要

Method and washing tool (24; 24') for combined cleaning of an annulus (10) in a well (2) across a longitudinal section (L) of the well (2), and subsequent plugging of the longitudinal section (L), wherein the method comprises the following steps: (A) conducting a perforation tool (18; 18') into a casing (8) to said longitudinal section (L); (B) forming holes (22) in the casing (8) along the longitudinal section (L); (C) by means of a washing tool (24; 24') conducted into the casing (8) on a tubular work string (16), pumping a washing fluid (26) through the tubular work string (16) and out into the casing (8) via the washing tool (24; 24'); (D) by means of a directional means associated with the washing tool (24; 24'), conducting the washing fluid (26) out into the annulus (10) via at least one hole (22) at a first location within the longitudinal section (L), after which the washing fluid (26) will flow via the annulus (10) and onward into the casing (8) via at least one hole (22) formed in at least one second location within the longitudinal section (L); (E) pumping a fluidized plugging material (50) out into the casing (8) at the longitudinal section (L); and (F) placing the plugging material (50) in the casing (8) and in the annulus (10) along the longitudinal section (L) so as to plug the casing (8) and the annulus (10).