Drilling fluids and borehole hydraulics : kompendium by Pål Skalle; Norges teknisk-naturvitenskapelige universitet

By Pål Skalle; Norges teknisk-naturvitenskapelige universitet Institutt for petroleumsteknologi og anvendt geofysikk

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Detergents, soaps, oils and surfactants are intended to be spotted in an area of suspected pipe sticking to reduce friction, increase lubricity and inhibit formation swelling. Gypsum, sodium silicate and calcium lignosulfonates, as well as lime and salt, are used to control swelling or hydrous disintegration of shale. ). com 31 Drilling Fluid Engineering Hydraulic friction in the circulating system 4. Hydraulic friction in the circulating system The objective of estimating hydraulic friction in the circulation system is three-fold: 1.

75 - log(n)]/7 4. 56) is derived from the logarithmic law of the turbulent velocity profile. 56) 5. 34. 57). Absolute roughness, , in a pipe in service will increase with time due to corrosion and scale build up. Figure 4-12: Moody friction factors vs. roughness. Roughness for new pipe materials is shown in Table 4-2. com 49 Drilling Fluid Engineering Hydraulic friction in the circulating system Table 4-2: Equivalent roughness calculated on basis of experimental data. The uncertainty is +/- 50 %.

Optimal hydraulic parameter estimated for vertical wells can probably be used as a first approach for inclined wells. 3 Optimizing ROP, liner by liner As indicated by the heading, the hydraulic program is dependent on first selecting the most suitable liner of the piston pump, before optimizing. It is the annular flow rate limitation, qr, which determines the selection of liners, as indicated in Figure 5-2. The smallest possible liner should be selected since this will result in the highest possible pressure available.

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