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Q1:3. What is the purpose of the vacuum distillation step? What is fed to it? What are its products? See Answer
Q2:Question 2 [30 marks] A tray distillation column fractionates a mixture of n-hexane, n-heptane, and n-octane. The liquid leaving the last tray (lowermost tray) is introduced to a reboiler which operates at 413 K and 3.07 bara. The composition of the liquid entering the reboiler is shown in Table 2. Table 2. Composition of liquid entering reboiler. Composition (mol basis) Component n-hexane n-heptane n-octane 0.12 0.78 0.1 a. Calculate the boil-up ratio of this operation. [10 marks] b. Determine the composition of the vapor entering the last tray (lowermost tray) of the column. [10 marks] 2 c. There is a suggestion from a newly joined process engineer to increase the reboiler temperature to 420 K while maintaining the pressure and feed composition the same. Evaluate the feasibility of this suggestion. You need to support your evaluation with detailed calculations. [10 marks]See Answer
Q3:Question 3 [20 marks] a. Simulation of multicomponent distillation in process simulation environment (e.g. Aspen Hysys, Aspen Plus, ChemCad) is very handy. Nevertheless, the approximate methods using Fenske Underwood Gilliland Kirkbride equations cannot be undermined. Can you please explain how these approximate methods are useful to establish the simulation using simulation package? [10 marks] b. Can you please elaborate the advantages and limitations of MESH equations for the multicomponent distillations? In line with the limitations, you should also highlight the ways to overcome the challenges of the implementation. [10 marks]See Answer
Q4:Q3: (25 Points) It has been decided to sidetrack a well from 1500 ft. The sidetrack will be a build and hold profile with the following specifications: TVD of Bottom of Hole: Horizontal departure: Build up Rate: Calculate the following: 10000 ft. 3500 ft. 1.5° per 100 ft. (a) Radius of curvature (b) Drift angle of the well. (b) TVD, MD and horizontal departure at the end of buildup section (c) TVD, MD and horizontal departure at the midpoint of buildup section (d) TVD, MD and horizontal departure at the midpoint of tangent section (e) Length of the arc and length of tangent (f) Total measured depth to the target./nQ4: (25 Points) A slant hole is to have a target depth of 5374 ft from mean sea level with 2147 ft south coordinate and 3226 ft east coordinate. The rotary bushing elevation is 780 ft from mean sea level. The magnetic declination is 6° east, KOP is 1510 ft and BUR is 20/100 ft. Find: 1. Target closure and azimuth 2. Maximum inclination angle 3. MD, TVD, and departure at EOB 4. MD, TVD, and departure at target 5. MD, TVD, and departure at 3000 ft 6. MD, TVD, and departure at 5426 ftSee Answer
Q5:Sat press 267.9 bar @ 92.8 °C Component Weight % Mole % Weight Molecular Density (g/cm³) at 15°C, 1 atm N2 0.145 0.56 CO2 1.45 3.55 C1 6.757 45.34 C2 1.531 5.48 C3 1.516 3.70 i-C4 3.78 0.70 n-C4 0.891 1.65 i-Cs 0.489 0.73 n-C5 0.580 0.87 C6 1.043 1.33 C7 2.276 2.73 89.9 0.757 Cs 3.125 3.26 103.2 0.777 C9 2.342 2.14 117.7 0.796 C10 2.379 1.94 133 0.796 C11 2.205 1.62 147 0.800 C12 2.179 1.47 160 0.815 C13 2.693 1.69 172 0.833 C14 2.789 1.62 186 0.843 C15 2.937 1.59 200 0.849 C16 2.553 1.30 213 0.858 C17 2.388 1.11 233 0.851 C18 2.885 1.26 247 0.856 C19 2.571 1.07 258 0.868 C20+ 51.898 13.32 421 0.914 1- Calculate the mole fraction C7+, Mw C7+ and gravity of the C7+. 2- Use the following splitting schemes to split the C7+ fraction into pseudo-components. a-Katz method (1938) c-Pedersen et al method (1982) e-Hossien et (2012) b-Lohmez et al method (1964) d-Ahmed's Method (1985) f-Al-Adwani et al (2018) 3- Tabulate the results of actual and predicted mole fraction and SCN 4- Plot the actual and predicted mol fractions by all methods versus SCN. 5- Construct the phase envelop of the actual and compare with the best performing splitting/ne-Hossien et (2012) f-Al-Adwani et al (2018) 3- Tabulate the results of actual and predicted mole fraction and SCN 4- Plot the actual and predicted mol fractions by all methods versus SCN. 5- Construct the phase envelop of the actual and compare with the best performing splitting scheme. How is the actual saturation pressure, critical pressure and cri-condentherm compared with calculated from original and predicted compositions? 6- Use Withson's lumping scheme to group the extended analysis into groups. Page 1 of 2 7- Characterize the pseudocomponents with Hong's Mixing Rules and calculate the critical pressure, critical temperature and acentric factor using any of the following methods of characterizing the undefined fraction. a-Riazi-Daubert method (1980) c-Kesler-Lee method (1976) e- Watansairi-Owens-Starling (1985) g-Rowe's Method (1978) i-Willman-Teja (1978) K-Twu (1984). b-Cavet method (1962) d-Winn-S-m-Daubert (1957) f-Edmister (1958) h-Standing (1942) j-Magoulas-Tassios (1990) L-Sancet (2007) 8- Construct the phase envelop of the lumping components. 9- How is the actual saturation pressure, critical pressure and cri-condentherm compare with calculated from original and predicted compositions? 10- Write your conclusions based on the results from 1 through 10.See Answer
Q6:Question 1. 1. Derive the design equations for gas capacity and oil capacity constraints for a horizontal separator for the following two cases: i. The gas occupies 75% of the separator effective volume. ii. The gas occupics 25% of the separator effective volume.See Answer
Q7: 2. We need to calculate the clay required to make up mud.Assume a mud volume of 200 BBL. A high yield clay (33BBL/ton) will be used. a. How many 100 lbm. "sacks" of clay are required? b. How much water is needed? What is the mud density before weighting? d.How 200 lbm. "sacks" of barite are required to many raise the density by 0.25 ppg? Calculate the pressure at the bottom of the well.C. e.Calculate the pressure at the bottom of the well.See Answer
Q8: 1. We are using an 12 lb/gal mud with Fann VG readings of22 at 300 rpm and 34 at 600 rpm. We have 6000 ft of 4.26inch inside diameter 5 inch outside diameter drill pipe. The pump outlet pressure is rated to a maximum of 3000 psia and the well is 6000 ft deep. if the mud was designed for "balance" when not circulating, what is the reservoir pressure?a. b. What are K and n?n c. What are Hpand t, ?Hp d. The bit has 3 nozzles 15/32 in diameter, i. What is the pressure drop across the bit if we circulate at 500 gpm? ii. What would the frictional pressure drop through drill pipe be? iii. What would the frictional pressure drop through the annulus be? iv. So what would the pump pressure be, and does this pose a problem?See Answer

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