Downhole mixing tool

摘要

A downhole mixing tool and method for removing sand and other debris from a wellbore which combines the sand with a treatment fluid so that the sand is lifted to the surface of the well for removal. The tool includes a chamber into which the sand laden fluid is drawn and the treatment fluid is introduced. Ports into the chamber are arranged to provide a pressure drop to draw the sand laden fluid into the chamber and a mixing time within the chamber before sand laden fluid of lower viscosity exits the chamber to travel to the surface. Additional features include blades on the tool for breaking up obstructions prior to being drawn into the chamber and a lubricating line through the tool to introduce lubricating fluid to the blades.

主权项

1. A downhole mixing tool for assisting in sand removal comprising first and second substantially tubular members with at least a portion of the first member being located in the second member id="REI-00001" date="20170124" to create an annular chamber therebetweenid="REI-00001" ; a first end for connection to a tubular string and a second end including one or more inlet ports id="REI-00002" date="20170124" accessing aid="REI-00002" id="REI-00003" date="20170124" giving access to the annular id="REI-00003" chamber formed between the members; the first member including a plurality of treatment ports arranged circumferentially and longitudinally upon its surface id="REI-00004" date="20170124" and exiting into the annular chamberid="REI-00004" ; the second member including one or more outlet ports exiting the id="REI-00005" date="20170124" annular id="REI-00005" chamber to an outer surface of the tool; the ports being arranged so that id="REI-00006" date="20170124" debris laden id="REI-00006" fluid entering the inlet port mixes with treatment fluid introduced id="REI-00007" date="20170124" directly id="REI-00007" to the id="REI-00008" date="20170124" annular id="REI-00008" chamber through the treatment ports and resides in the id="REI-00009" date="20170124" annular id="REI-00009" chamber until the id="REI-00010" date="20170124" debris laden id="REI-00010" treated fluid exits through the outlet port id="REI-00011" date="20170124" to surfaceid="REI-00011" .