Four different methods of equivalent diameter of the annulus have been considered in this hydraulic analysis. The correction factor model for frictional pressure drop was also considered in the investigations. All methods addressed the high deviation of the prediction from the experimental data, which ...
(2)dh=do−di(3)dc=0.5[do4−di4−(do2−di2)2ln(do/di)]0.25+0.5(do2−di2)0.5(4)ds=0.816(do−di)where do and di are the inner diameter of the outer pipe and the outer diameter of the inner pipe respectively. The Crittendon criterion is an empirical expression formulated...
Bit diameter: 7.875 in. Rate of penetration (ROP): 18 ft./h Bit nozzles: 20 3×1/32nd in. Solution: This problem is solved using spreadsheet program GasiifDrill-20.xls. Fig. 7.31 presents calculated EMW profile in the annular space. It indicates an EMW value 7.36 ppg at depth 2000...
1C, the expansion cones 270 have an outer diameter greater than an inner diameter of a section of the liner hanger 120 downhole from the expansion cones 270.In an embodiment, the liner hanger 120 may be expanded against a wall of the casing after the liner has been cemented to the wall...
To isolate porous geologic formations from the wellbore and to prevent collapse of the well, the well is generally cased with tubular steel pipe joints connected together to form a casing string. Casing is set in progressively smaller diameter sections as drilling progresses. Downhole conditions and...
Four different methods of equivalent diameter of the annulus have been considered in this hydraulic analysis. The correction factor model for frictional pressure drop was also considered in the investigations. All methods addressed the high deviation of the prediction from the experimental data, which ...
Variation in the length of the interface transition zone is the main reason for the deviation in ECD prediction accuracy. In the case of constant casing outer diameter, fluid rheology, and displaced fluid density, the ECD decreases with increasing borehole radius. Meanwhile, it increases with ...
Therefore, the system parameters of SRPS to be designed include the polished-rod stroke, pumping speed, diameter of plunger, diameter of weighting rod, diameter of CR, length ratio of CR, rated power of motor and rated load of pumping unit. Thus, the optimization parameters X are as ...
Research has taken a directional well 7X27x2 in an oilfield in Eastern China as an example, and the well depth is 4980 m, the three-opening drill bit size is 215.9 mm, and the outer diameter of the casing is 139.7 mm. Based on the barehole section of the well logging data, this ...