fig9 typically needs a higher fluid flow rate to suspend sand particles than an assembly having a jet pump such as the one shown in fig1 this may require running the coiled tubing tractor assembly on a bigger coiled tubing string thus for example when cleaning with a rearward facing jetting assembly flow rates of 1 u00bd to 2 barrels per minute in a 1 u00be inch to 2 inch coiled tubing may be required to adequately suspend and maintain the sand particles in suspension until they are deposited behind the tractor assembly by way of comparison using the coiled tubing tractor assembly with a jet pump may require a flow rate for example on the order of 1 barrel per minute through a 1 u00bd or 1 u00be inch coiled tubing string to adequately displace the sandbed upon reaching the end of the wellbore or reaching a point where it is no longer possible to move the coiled tubing string through the sand beds behind the tractor assembly the sand is circulated out of the wellbore there are several ways of removing the sand behind the tractor assembly out of the wellbore the simplest method is to rely on pure fluid velocity and flow rates to clean out the wellbore behind the tractor assembly typically this method is practiced with the coiled tubing in a stationary position to keep from prematurely fatiguing the coiled tubing although simpler this method may require several hole volumes to be circulated at high fluid velocity to remove the sand from the wellbore and thus tends to be more time consuming and more expensive in a preferred embodiment a pump through.