A method of sealing of a part of the annulus between a well tubular and the well bore, using an assembly comprising: - an inflatable packer section prepared for being expanded by fluid, and being provided with valve means for opening and closing of fluid communication into the inflatable packer section; - an energy section comprising an energy source for the delivering of fluid into the inflatable packer section; - a triggering section comprising means for controlling of said energy source and/or for controlling of said valve means thereby being capable of controlling the delivery of said fluid into said inflatable packer section, said triggering section further being provided with means for communication with a triggering device for initiating the expansion of said inflatable packer section, and - a fluid section being in fluid communication with said inflatable packer section and comprising a suitable fluid for being delivered into said inflatable packer section, said method comprising the steps of: drilling a well into a formation; introducing into the well a number of said assemblies, said assemblies partake as elements inserted between conventional well tubular being e.g. a casing or liner, thereby providing an annular space, or annulus, between said well tubular and the formation surrounding said well tubular; pumping of acid through said well tubulars and into the formation in order to stimulate said well; triggering of at least two of said assemblies in order to expand two of said packer sections to seal off a part of said annular space; introducing an inner tubing into said well tubulars thereby providing a gap between said inner tubing and said well tubular, said inner tubing having means for sealing of a specific part of the gap such that this specific part is only in fluid communication with the isolated zone established between said expanded packer sections, said inner tubing further being provided with at least one closable opening for establishing of fluid communication from inside said tubing and into said gap and further into the sealed off part of said annular space. - an inflatable packer section prepared for being expanded by fluid, and being provided with valve means for opening and closing of fluid communication into the inflatable packer section; - an energy section comprising an energy source for the delivering of fluid into the inflatable packer section; - a triggering section comprising means for controlling of said energy source and/or for controlling of said valve means thereby being capable of controlling the delivery of said fluid into said inflatable packer section, said triggering section further being provided with means for communication with a triggering device for initiating the expansion of said inflatable packer section, and - a fluid section being in fluid communication with said inflatable packer section and comprising a suitable fluid for being delivered into said inflatable packer section, said method comprising the steps of: drilling a well into a formation; introducing into the well a number of said assemblies, said assemblies partake as elements inserted between conventional well tubular being e.g. a casing or liner, thereby providing an annular space, or annulus, between said well tubular and the formation surrounding said well tubular; pumping of acid through said well tubulars and into the formation in order to stimulate said well; triggering of at least two of said assemblies in order to expand two of said packer sections to seal off a part of said annular space; introducing an inner tubing into said well tubulars thereby providing a gap between said inner tubing and said well tubular, said inner tubing having means for sealing of a specific part of the gap such that this specific part is only in fluid communication with the isolated zone established between said expanded packer sections, said inner tubing further being provided with at least one closable opening for establishing of fluid communication from inside said tubing and into said gap and further into the sealed off part of said annular space.