Drilling Hydraulics Templates

The whole circulating system of one well on one page. Enter Fann 35 readings from the mud check, the flow rate, the nozzle sizes and the pore and fracture pressures. The sheet fits Bingham plastic, power-law and Herschel-Bulkley models and plots them against the readings. It computes the pressure loss in each drill string component and in each of the six annulus sections (collars, heavy-weight and drill pipe, each against open hole and against casing), and gives the bit pressure drop, jet velocity, hydraulic horsepower, HSI and impact force. These add up to the standpipe pressure and the share of it spent at the bit. The ECD at the shoe and at TD is charted against the pore and fracture window, with checks on both and on static overbalance.

What the hole does to the mud, and what the mud says about the hole. For the planned ROP the sheet works out the cuttings volume per foot, the cuttings concentration in the returns, the annular velocities and the highest ROP that keeps the annulus mud weight under a limit, with that limit charted against flow rate. It gives the solids content from the mud weight and the dilution needed to bring a heavy system back to weight. Two marker calculations use the well's geometry. A drill pipe washout depth comes from the strokes until a marker is seen back at surface, and the average open-hole diameter and excess volume come from a carbide lag.