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A pressure build-up test was conducted in a well after 1000 days of producing oil at a constant rate of 0.01 reservoir-m3 /s. The two shut-in bottom-hole pressure readings taken at 0.5 day and 1 day after shut-in are 150 × 105 Pa and 151 × 105 Pa, respectively. These pressure points correspond to the linear region of the Horner’s plot. The reservoir thickness is 100 m and oil viscosity is 0.001 Pa.s. The permeability of the reservoir is ______ mD (round off to 1 decimal place). [1 mD = 10^-15 m^2 ].
0 Answer

An oil well (producing under expansion drive only) in a reservoir is subjected to two pressure build-up tests. Gate-2018-General-Aptitude
0 Answer

Using Miller, Dyes and Hutchinson (MDH) method, the skin factor of an oil well is found to be s = – 3.5. Gate-2018-General-Aptitude
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Oil is produced at a constant rate from a well in a bounded reservoir. The variation of the bottom-hole pressure with time is shown in the given Table. The magnitude of the slope of the pressure vs time curve that you would use to find the drainage area is _____ psi/day (round off to 1 decimal place).
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In an active water drive during a certain period, the rate of production and reservoir pressure remain constant. The water influx into the reservoir from the aquifer is 6000 bbl/day. The surface oil and water production rates are 3000 STB/day and 1500 STB/day, respectively. The current production gas to oil ratio is 825 SCF/STB, and the formation volume factors at the current pressure for oil, water and gas are 1.375 bbl/STB, 1.04 bbl/STB and 0.007 bbl/STB, respectively. The solution gas to oil ratio at the current pressure is ________ SCF/STB (round off to 1 decimal place).
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In a faulted reservoir, the principle of superposition for the pressure drop using diffusivity equation is applicable. This is due to (A) high Reynolds number flow in the well. (B) constant permeability. (C) pressure dependent viscosity. (D) linearity of the diffusivity equation.
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Oil is produced at a constant rate of 10 m^3 /day from a reservoir for 500 days. The producing gas oil ratio (GOR) is constant at 10 m^3 gas/m^3 oil for the first 100 days. Then, the producing gas oil ratio increases linearly and on the 500th day the measured GOR is 50 m^3 gas/m^3 oil . The cumulative produced gas oil ratio after 500 days of production is ______ m^3 gas/m^3 oil (round off to 1 decimal place). Assume that all volumes are measured at STP.
0 Answer

Which one of the following options presents the correct combination? (P) Reservoir limit test (I) Communication between wells (Q) Modified isochronal test (II) Ideally zero flowing bottom hole pressure (R) Interference test (III) Extended drawdown test (S) Absolute open flow potential (IV) Drawdown and build-up test of equal duration. Gate-2018-General-Aptitude
1 Answer

An oil well is tested at a flow rate (Q) of 50 BOPD. The bottom hole flowing pressure (Pwf) is 500 psia.The Vogel’s correlation is: Gate-2018-General-Aptitude
0 Answer

A vertical well of 8000 ft is producing below bubble point pressure. Oil and water each is produced at the rate of 500 bbl/day. The indicated bottom hole pressure is 3000 psi. If the same gas to liquid ratio (GLR) is maintained, using the given figure, the new bottom hole pressure at 5000 ft is __________ psi. A vertical well of 8000 ft is producing below bubble point pressure. Oil and water each is produced at the rate of 500 bbl/day. The indicated bottom hole pressure is 3000 psi. If the same gas to liquid ratio (GLR) is maintained, the new bottom hole pressure at 5000 ft, using the given figure, is __________
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In an oil reservoir, the residual oil saturation in the volume flooded with polymer solution is 20%. The initial water saturation is 20%. The volumetric sweep efficiency is 50%. The maximum possible recovery factor for the reservoir is _______% (round off to 1 decimal place).
0 Answer

CO2 foams are used for enhanced oil recovery due to which of the following reasons? (I) It can be used for CO2 sequestration (II) CO2 can exist in the form of a dense fluid at reservoir conditions (III) CO2 can convert to hydrocarbon at the reservoir temperature and pressure (IV) Solubility of CO2 in oil is higher compared to gases like N2 (A) Only I, II, and III (B) Only I, II, and IV (C) Only II, III, and IV (D) Only I, III, and IV . Gate-2018-General-Aptitude
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The theoretical maximum velocity (in m/s) of air expanding from a reservoir at 700 K is __________ (accurate to two decimal places). Specific heat of air at constant pressure is 1005 J/(kg-K). (GATE-Aerospace-Engineering-2018)
1 Answer

A driller finds an oil reservoir with a gas cap starting at a depth of 1000 m from the surface. Gate-2018-General-Aptitude
0 Answer

A reversible engine receives 75 kJ/s of energy from a reservoir at 750 K and does 12 kJ/s of work. The heat is rejected to two reservoirs at 650 K and 550 K. The rate of heat rejection (in kJ/s) to the reservoir at 650 K is
1 Answer

An air standard Otto cycle has thermal efficiency of 0.5 and the mean effective pressure of the cycle is 1000 kPa. For air, assume specific heat ratio  = 1.4 and specific gas constant R = 0.287 kJ/kg·K. If the pressure and temperature at the beginning of the compression stroke are 100 kPa and 300 K, respectively, then the specific net work output of the cycle is ______ kJ/kg (round off to two decimal places).
0 Answer

Piezometer is used to measure
1 Answer

An ideal gas occupies an unknown volume V liters (L) at a pressure of 12 atm. The gas is expanded isothermally against a constant external pressure of 2 atm so that its final volume becomes 3 L. The work involved for this expansion process is ________cal. (Round off to two decimal places) (Gas constant R = 0.082 L atm mol–1 K –1 = 2 cal mol–1 K –1 )
1 Answer

U nder isothermal condition, a vertical tube of length L = 100 m contains a gas of molecular weight equal to 60. The pressure and temperature at the top of the tube are 100 kPa and 25 oC respectively. Consider the universal gas constant and acceleration due to gravity as 8.314 J mol-1 K-1 and 9.81 m s-2 respectively. If the gas is ideal, the pressure (in kPa) at the bottom of the tube will be ____________ (rounded off to third decimal place).
0 Answer

A heat pump is transferring 10 kW from a reservoir at 200 K to a reservoir at 300 K.
1 Answer

Notes

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