Patent ID: 6189618
Filing Date: 2001-02-20
Classification: B05B,E21B

Abstract:
A wash nozzle for wellbore washing operations, the wash nozzle comprisinga central mandrel having a top, a bottom, and a fluid flow bore therethrough from top to bottom,at least one mandrel port through the central mandrel for fluid flow from within the central mandrel's fluid flow bore to an exterior of the central mandrel,a hollow sleeve rotatably mounted around the central mandrel, andat least one sleeve port through the sleeve for fluid flow from within the sleeve from the exterior of the central mandrel to an exterior of the sleeve,the at least one mandrel port is a plurality of lower mandrel ports, andthe at least one sleeve port is a plurality of lower sleeve ports,a plurality of upper mandrel ports spaced apart from the lower mandrel ports, anda plurality of upper sleeve ports spaced apart from the lower sleeve ports,an upper cut-out area within the wash nozzle defined by a cut-out portion of the central mandrel and a cut-out portion of the sleeve,the upper mandrel ports and the upper sleeve ports in fluid communication with the upper cut-out area, anda piston having a top, a bottom, and a fluid flow bore therethrough from top to bottom,at least one shearable member releasably securing the piston to and within the central mandrel, anda portion of the piston initially blocking fluid flow through the lower mandrel ports.