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- Question 1 of 19
A box has a total of ten identical sized balls. Seven of these balls are black in colour and the rest three are red. Three balls are picked from the box one after another without replacement. The probability that two of the balls are black and one is red is equal to ______.CorrectIncorrect
- Question 2 of 19
The porosities of cubic and hexagonal packings, respectively, areCorrectIncorrect
- Question 3 of 19
In sonic logging, the sonic velocities in the formation and drilling mud are 50,000 ft/s and 500 ft/s, respectively. The critical angle is ____ radians.CorrectIncorrect
- Question 4 of 19
A section of a clean sandstone reservoir was logged and found to have a porosity of 10%. The cementation (m) and saturation (n) exponents are equal to 2. The constant ‘a’ in Archie’s saturation equation is 1. The formation water resistivity is 0.036 ohm-meter and the formation resistivity is 10 ohm-meter.
The water saturation in the reservoir is______%.CorrectIncorrect
- Question 5 of 19
Match the entries in Group 1 with those in Group 2
Group 1 Group 2
P. Blow Out Preventer I. Horizontal well problem
Q. Diamond bit II. Reverse ballooning
R. Tubing elongation III. Well control
S. Eccentricity IV. Crown
- Question 6 of 19
It is desired to increase the density of 200 bbl of 10 ppg mud to 12 ppg mud using API Barite of density 35 ppg. The final volume is not limited.
[1 bbl = 42 gallons] The amount of API Barite required is ________ lbmCorrectIncorrect
- Question 7 of 19
Using the High Pressure High Temperature (HPHT) filter press data given below, the estimated API filtration loss is _________ cm3.
Data given: Time (min) Filtrate volume (cm3)
- Question 8 of 19
A Differential Liberation Experiment (DLE) and a Constant Composition Expansion (CCE)/Flash liberation experiment were performed in a laboratory for a crude oil to find the formation volume factor (Bo) and the dissolved gas oil ratio (Rs). The pressure stages for both experiments were kept the same. At a pressure less than the bubble point pressure of the crude oil, which of the following statements is TRUE?CorrectIncorrect
- Question 9 of 19
A 30 ft thick gas reservoir has an area of 3,000 acres (1 acre = 43,560 ft2). The porosity of the reservoir is 15% and the connate water saturation is 20%. Initial reservoir pressure and temperature are 2,600 psig and 150°F (= 610°R), respectively. The compressibility factor (Z) at initial conditions is 0.82. The gas in the reservoir can be produced till it attains the final pressure of 1,000 psig (Z = 0.88) under isothermal conditions. The gas recovery factor is ______ %.CorrectIncorrect
- Question 10 of 19
Brine is used to measure the absolute permeability of a core plug. The rock sample is 4 cm long and its cross-sectional area is 4 cm2. The brine has a viscosity of 2 cp and is flowing at a constant rate of 0.5 cm3/s under a 4 atm pressure differential. The absolute permeability is _________________ Darcy.CorrectIncorrect
- Question 11 of 19
An oil well is drilled to cover a circular drainage area of radius 700 ft. The well is completed with a 7 inch production casing. Assume reservoir pressure of 1000 psig, permeability of 50 md, pay zone thickness of 20 ft, oil viscosity of 3 cp and oil formation volume factor of 1.25 reservoir-bbl/STB. For a flowing bottom-hole pressure of 500 psig, the primary production rate is _______ STB/day.CorrectIncorrect
- Question 12 of 19
An Electric Submersible Pump (ESP) is installed at a depth of 1000 ft from the surface. The ESP gives 20 ft water head per stage. The wellhead requires 100 psi pressure. Minimum number of stages of the ESP required for this well is _____.CorrectIncorrect
- Question 13 of 19
A ground station has a pump, which delivers a head of 1,000 m water. It is pumping oil of specific gravity 0.8 into a horizontal pipe of diameter 0.5 m with an average velocity of 2 m/s. The efficiency of the pump is 80%. Density of water is 1,000 kg/m3 and acceleration due to gravity is 9.8 m/s2.
The power required to operate the pump is _______________ Mega Watts.CorrectIncorrect
- Question 14 of 19
For a floating vessel, match the CORRECT pairs from Group 1 and Group 2 among the options given below. (B = Centre of buoyancy; G = Centre of gravity and M = Metacentre)
Group 1 Group 2
P. M is above G I. Stable equilibrium condition
Q. M is below G II. Critically stable condition
R. M is coinciding with G III. Unstable condition
S. B is below GCorrectIncorrect
- Question 15 of 19
During a production test in an oil reservoir, the oil production rate is 200 STB/day. The producing gas oil ratio (GOR) is 800 SCF/STB and dissolved GOR is 200 SCF/STB. The formation volume factor of gas is 0.01 ft3/SCF and the formation volume factor of oil is 1.2 reservoir-bbl/STB. The down-hole GOR is __________ ft3/reservoir-bblCorrectIncorrect
- Question 16 of 19
A productivity test was conducted on a single-phase crude oil well. The well is capable of producing 100 STB/day at a flowing bottom-hole pressure of 1000 psig. The 24-hour shut-in static pressure is found to be 1500 psig. The maximum oil flow rate (Qmax) is_______ STB/day.CorrectIncorrect
- Question 17 of 19
An oil well of wellbore radius 0.5 ft is shown to develop a skin due to formation damage. The damaged zone radius is 2.25 ft around the well. The formation permeability is 300 md and the permeability of the damaged zone is 100 md. The effective well bore radius for this well is___________ft.CorrectIncorrect
- Question 18 of 19
A producing well has a shut-in tubing pressure of 3,950 psig for crude oil of specific gravity 0.69. [1 g/cm3 = 8.33 ppg]
The kill fluid density for a workover job at 11,600 ft (TVD) is ___________ ppgCorrectIncorrect
- Question 19 of 19
A heavy oil reservoir is being flooded with a line drive (assume one-dimensional flooding). The fractional flow of water is found to be 0.75 bbl/bbl at water saturation (SW) of 60%. A polymer solution with twice the viscosity of water is used as displacing phase. Assume the relative permeability curves for water flooding and polymer flooding are the same. The fractional flow of polymer solution at a saturation of 60% is _________bbl/bbl.CorrectIncorrect