Take a look at forumlas that can help drillers avoid out running their drillling fluids.
Over the past few years there have been numerous articles on bore planning. Most of these articles focused on a major problem in the horizontal directional drilling (HDD) industry: OUT RUNNING OUR DRILLING FLUIDS. Let's look again at the formulas that help avoid this problem and address other problems not associated with the fluids, which are causing most of the contractors' unwanted problems.
To understand drilling fluid requirements, we need to establish parameters of the bore: length of bore, reamer type and size, and soil conditions. Always keep in mind there is no universal soil type; therefore, there is no one universal drilling fluid, reamer, or set time to do a successful bore. Look at every new bore as if it was your first, regardless of your experience or how successful you have been in the area in the past.