Question

PUD Problems 7-1 Calculate the Calculate the bottomhole pressure for the injection of 1500 bbl/d of brine with a density of LOS g/cm' and a viscosity of 1.3 cp in an 8000-ft vertical well having a surface pressure of 200 psi and (a) 2-in., 3.4-1b/ft tubing; (b) 2 7/8-in., 8.6-1b/ft tubing; c) 3 1/2-inch, 12.70-1b/ft tubing. fluid in Annendix A flows in a well of 10 000 ft deen with a production tubing of new,

Answer 1

problem 7.11. Solution! the injection = 1500 bb 4d Prenure of brain with density of = 1.089 km² -1.3 CP velocity vetical well having =8000 - - 200 psi Surface premore inner diameter = 1.751 in gelative rough nen :0.00.4 Calculate 1. the bottomhole premure : - The pressure at the bottom hole. For, non-flowing conditions, it is caused by the hydrostatic pressure of the well bore fluid

and by any back pressure held at the surface , if any, when well bore floid in being circulated, bottom hole pressure is the hydrostatic prenure plus the drop in the pressure annulur. friction mody factor friction : Fm [zlog(371099 (zlog [operatore Fm = 4:68 X10-3 watex velocity =1.3CP Temparatore T -16°C -60.8°F Aug z - Factor 777 Water - C0.002) 0.03758H ss- TZ

40.5 0.0375 X 1.08 X1000 is, 00575 X 1008 2009 52.18 s = (60.8+460 x 1.002 15. 0.001760) The flow rate, q = 1500 bbild = 11229.17 sefld. 9 | 505 CPin- es. pwh?) 0.5 = 2,00,000/ Lo.P.z.tifm Ce8-07] IX 10.077.60X25 (80002-20.007760-70.5 11229.1752x105 - pon? 1 11.08 (60.8+460).1.0021X1000 x468)* - 103 Ce0.007760) [2.416 (64X106_1.079 P wh2]] 3.1523x10- 31 201.12 0.2624 564x10^-1.079 Puh? 0.2624 +1.079 pwh? =64x106

,0199 = zy od hlheil Puh? 901xh9 = 1. 39ји чоd ) 150 +- Eaь 9 * The bottom hole pressure [BLP 76907.34 psi