Sirkuleringsverktoy for anvendelse ved gruspakking av bronner

An apparatus for use in wellbores that enables the running in, washing down, gravel packing, reversing excess slurry, and the spotting of post gravel pack fluids on a single trip. The one trip apparatus comprises a housing having an exterior and a longitudinal bore extending therethrough, and a lateral port providing a communication path between the housing longitudinal bore and the exterior of the housing. A first sleeve is disposed within the housing longitudinal bore that has a longitudinal passageway therethrough and is capable of being positioned in an upper position and a lower position relative to the housing. First and second lateral passageways extend through the wall of the first sleeve. A second sleeve is disposed within the first sleeve and also has a longitudinal passageway therethrough. The second sleeve is capable of being positioned in an upper position and a lower position relative to the first sleeve. A first flow passage extends longitudinally through the housing and a second flow passage extends longitudinally through the housing. When the first sleeve is in the upper position, and the second sleeve is in the lower position, communication is established between the longitudinal bore of the housing above the second sleeve and the exterior of the housing, and communication is established between the longitudinal bore of the housing below the second sleeve and the first flow passage. When the first sleeve is in the lower position, communication is established between the longitudinal bore of the housing above the first sleeve and the second flow passage.