FLUID SYSTEM FOR MOVING SUBSURFACE WELL EQUIPMENT IN WELL TUBING

A fluid system for running and retrieving subsurface well equipment in a well tubing by fluid flow through an upper entrance tubing. The upper entrance tubing includes curved portions and includes first and second conduits of different sizes. Both of the conduits have an inside diameter greater than the inside diameter of the well tubing with the first size conduit being larger than the second size conduit and being positioned in the upper tubing at curved portions of the upper tubing to allow passage of lengthy well equipment through the upper entrance tubing. First and second locomotives having an outside diameter substantially equal to the inside diameter of the second size conduit, and a third locomotive having an outside diameter substantially equal to the inside diameter of the well tubing and releasably connected to the other locomotives for being carried to and moved in the well tubing in response to fluid flow. The locomotives being spaced from each other whereby one of the locomotives will always be in a conduit of a size corresponding to the one locomotive to provide movement of the locomotives by fluid through the tubing. The first size conduit including elbows with the first and second locomotives spaced from each other a distance greater than the axial extent of said elbows.