Fremgangsmåte for kombinert rengjøring og plugging i en brønn, vaskeverktøy for retningsstyrt spyling i en brønn, samt anvendelse av vaskeverktøyet

摘要

Methods and washing tools are described for combined cleaning of an annulus in a well across a longitudinal section (L1) of the well, and subsequent plugging of the longitudinal section (L1). The method comprises: (A) conducting a perforation tool into a casing to said longitudinal section (L1); (B) forming holes in the casing along the longitudinal section (L1); (C) by means of a washing tool conducted into the casing on a tubular work string, pumping a washing fluid through the tubular work string and out into the casing via the washing tool; (D) by means of a directional means associated with the washing tool, conducting the washing fluid out into the annulus via at least one hole at a first location within the longitudinal section (L1), after which the washing fluid will flow via the annulus and onward into the casing via at least one hole formed in at least one second location within the longitudinal section (L1); (E) pumping a fluidized plugging material out into the casing at the longitudinal section (L1); and (F) placing the plugging material in the casing and in the annulus along the longitudinal section (L1) so as to plug the casing and the annulus.