JNTU
JNTU B.Tech III PETROLEUM RESERVOIR ENGINEERING Previous Question Paper (April - 2018 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
Write a short note about the surface recombination sampling.
Answer
Surface recombination sampling involves collecting separate samples of oil and gas from the surface separator at measured separator conditions (pressure, temperature, and gas-oil ratio). These samples are then recombined in a laboratory cell at reservoir temperature to reconstruct the original reservoir fluid composition for PVT analysis.
Difference between overburden and hydrostatic pressure.
Answer
Hydrostatic pressure is the pressure exerted by a column of fluid (usually water) due to gravity, calculated as P = ρgh. In contrast, overburden pressure is the pressure exerted by the total weight of the overlying rock formations and their contained fluids on a subsurface layer.
What is the significance of Darcy's law?
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What is the principal drive mechanism in natural water drive?
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Draw the pressure profile during the steam soak production phase.
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Derivation of the basic radial differential equation in a porous medium.
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What is the superposition theorem?
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Give a brief note on the multi-rate flow test analysis.
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Write a short note on the capillary pressure curve.
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How to describe the water saturation distributions at breakthrough and subsequently in a linear water flood.
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Part B
Explain the volumetric gas reservoir engineering and determine the Z-factor using experimental determination and Z-factor correlation of Standing and Katz methods.
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What is the corresponding underground withdrawal rate in reservoir barrels/day?
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If the average reservoir pressure at the time the above measurements are made is 2400 psia, calculate the daily underground withdrawal corresponding to an oil production of 2500 stb/day and a gas rate of 2.125 MMscf/day. Bo = 1.1822 rb/stb; Rs = 352 scf/stb and Bg = 0.0012 rb/scf.
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If the density of the oil at standard conditions is 52.8 lb/cu.ft and the gas gravity is 0.67 (air = 1) calculate the oil pressure gradient in the reservoir at 2400 psia.
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Determine the fractional oil recovery, during depletion down to bubble point pressure, for the reservoir whose PVT parameters are follows: Pi = 4000 psi, Boi = 1.2417 rb/stb, Pb = 3330 psi, Bob = 1.2511 rb/stb.
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Give a detailed note on the surfactant flooding and tertiary flooding.
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Write a detail note on the following with neat diagrams:
- Natural water drive
- Compaction drive.
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Explain the pressure distribution and geometry appropriate for the solution of the radial diffusivity equation under steady-state conditions.
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Describe the linearization of basic equation of the radial flow for fluids of small and constant compressibility.
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A homogeneous formation has an average effective permeability ke. The effective permeability out to a radius ra from the well has been altered (damage/stimulation) so that its average value in this region is ka. Show that, for this situation, the skin factor may be expressed as
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Give the example of the application of the stabilized inflow equations.
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A well is initially producing at a rate of 400 stb/d from a reservoir which has the following rock and fluid properties k = 50 mD, h = 30 ft, rw = 6 inches, φ = 0.3, µ = 3 cp, c = 10 × 10-6 / psi, Bo = 1.25 rb/stb
After what value of the flowing time is the approximation
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What will be the pressure drop at the well after flowing at the steady rate of 400 stb/d for 3 hours, assuming transient conditions still prevail?
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An initial test in a discovery well is conducted by flowing the well at four different rates over a period of 12 hours. At the end of the flow test the well is closed in for a pressure buildup from which the permeability is estimated as 610 mD. The available reservoir data and fluid properties are listed below. Drainage area A = 80 acres
Analyse the test data to determine k and S
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Repeat the analysis evaluating the PD function for transient flow conditions.
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Explain in detail of displacement under segregated flow conditions with help of neat sketches.
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Explain the Buckley-Leverett one dimensional displacement with graphical representation.
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