Fluid Dynamics Quiz
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Questions and Answers

Which factor influences the gross rock volume of a reservoir?

  • Depositional environment (correct)
  • Viscosity
  • Formation volume factors
  • Fluid compositions

    • Which characteristic of the fluids in a reservoir is important to consider?

  • Net:Gross ratio
  • Hydrocarbon saturation
  • Porosity
  • Gas:Oil ratio (correct)

    • Which parameter is crucial to determine the hydrocarbon in place?

  • Reservoir quality
  • Depositional environment (correct)
  • Capillary pressure
  • Facies distributions

    • Which factor controls the gross rock volume of a reservoir?

    <p>All of the above</p> Signup and view all the answers

    What is the likely performance of the reservoir during production?

    <p>High hydrocarbon production rates</p> Signup and view all the answers

    What is the pressure regime in a reservoir?

    <p>Pore pressure</p> Signup and view all the answers

    What is capillary pressure in a reservoir?

    <p>Oil pressure minus water pressure</p> Signup and view all the answers

    Which of the following is a characteristic of permeability?

    <p>The ability of the rock to transmit fluid</p> Signup and view all the answers

    What is the equation for Darcy's Law?

    <p>$q = \frac{k \Delta P},{\mu L A}$</p> Signup and view all the answers

    What is the main factor controlling porosity in a rock?

    <p>Grain size</p> Signup and view all the answers

    What is the productivity index (PI) used for in well testing?

    <p>To determine the flow rate of oil</p> Signup and view all the answers

    Which type of tests are performed during a DST?

    <p>Both closed and open tests</p> Signup and view all the answers

    What is the term used to describe the time that decreases as real time increases in semilog plots of DST and production data?

    <p>Horner time</p> Signup and view all the answers

    What are the objectives of reservoir appraisal?

    <p>Assessing reservoir performance and production rates</p> Signup and view all the answers

    What is the significance of H2S and barium in the context of reservoirs?

    <p>H2S affects fluid recovery and barium causes scale precipitation</p> Signup and view all the answers

    Which equation represents the Young Laplace Equation?

    <p>$PO - PW = \sigma(\frac{1}{R1} + \frac{1}{R2})$</p> Signup and view all the answers

    Capillary pressure is defined as:

    <p>oil pressure minus water pressure</p> Signup and view all the answers

    What is the relationship between capillary pressure and water saturation?

    <p>For the same interfacial tension, smaller radius of curvature leads to higher capillary pressure</p> Signup and view all the answers

    What is the purpose of a Repeat Formation Tester (RFT) in oil exploration?

    <p>To record fluid pressure at different depths to establish likely fluid contacts</p> Signup and view all the answers

    Which of the following tests are performed and analyzed during a DST?

    <p>Both pressure drawdown and build-up</p> Signup and view all the answers

    What is the term used to describe the time that decreases as real time increases in semilog plots of DST and production data?

    <p>Horner time</p> Signup and view all the answers

    What is the main objective of reservoir appraisal?

    <p>To evaluate reservoir performance and characteristics</p> Signup and view all the answers

    What is the significance of H2S and barium in the context of reservoirs?

    <p>They can cause issues such as toxicity and scale precipitation</p> Signup and view all the answers

    Which of the following is NOT a characteristic of permeability?

    <p>Influenced by the viscosity of the fluid</p> Signup and view all the answers

    What is the equation for Darcy's Law?

    <p>$q = \frac{K \Delta P},{\mu L A}$</p> Signup and view all the answers

    What is the likely performance of the reservoir during production?

    <p>High porosity and high permeability</p> Signup and view all the answers

    What is the purpose of a Repeat Formation Tester (RFT) in oil exploration?

    <p>To collect fluid samples from the reservoir</p> Signup and view all the answers

    Which factor is NOT a control on gross rock volume in a reservoir?

    <p>Capillary pressure</p> Signup and view all the answers

    What is the equation for pore pressure in a reservoir?

    <p>$P_{Pore} = P_{Hydrostatic} - P_{Lithostatic}$</p> Signup and view all the answers

    What is the equation for capillary pressure in a reservoir?

    <p>$PC = (\rho_o - \rho_w)gh$</p> Signup and view all the answers

    What is the characteristic of reservoir rock wettability?

    <p>Water-wet</p> Signup and view all the answers

    Which equation represents the relationship between capillary pressure and radius of curvature in the Young Laplace Equation?

    <p>$PO - PW = \sigma(\frac{1}{R1} + \frac{1}{R2})$</p> Signup and view all the answers

    Which of the following is true about drainage and imbibition in a reservoir?

    <p>Drainage is the decrease of the wetting phase saturation, while imbibition is the increase of the wetting phase saturation.</p> Signup and view all the answers

    What is the purpose of a Repeat Formation Tester (RFT) in oil exploration?

    <p>To establish the likely fluid contacts at different depths.</p> Signup and view all the answers

    What is the main factor controlling the gross rock volume of a reservoir?

    <p>Depositional environment and facies distributions.</p> Signup and view all the answers

    Which equation represents Darcy's Law, which describes the flow of fluid through a porous medium?

    <p>$Q = \frac{kA}{\mu}\frac{\Delta P}{L}$</p> Signup and view all the answers

    Which factor primarily controls the gross rock volume of a reservoir?

    <p>Shape of structure</p> Signup and view all the answers

    What is the main objective of reservoir appraisal?

    <p>To determine the hydrocarbon in place</p> Signup and view all the answers

    Which equation represents the relationship between capillary pressure and water saturation?

    <p>$P_c = \frac{{2\gamma}},{{r}}$</p> Signup and view all the answers

    What is the equation for pore pressure in a reservoir?

    <p>$P_p = \rho gh$</p> Signup and view all the answers

    What is the equation for capillary pressure in a reservoir?

    <p>$P_c = \frac{{\gamma}},{{r^2}}$</p> Signup and view all the answers

    Which equation represents the relationship between capillary pressure and radius of curvature in the Young Laplace Equation?

    <p>$PO - PW = \sigma( \ rac{1},{R_1} + \ rac{1},{R_2})$</p> Signup and view all the answers

    What is the characteristic of reservoir rock wettability?

    <p>Mixed-wet</p> Signup and view all the answers

    What is the likely performance of the reservoir during production?

    <p>High hydrocarbon production rates</p> Signup and view all the answers

    Which factor is NOT a control on gross rock volume in a reservoir?

    <p>Depositional environment</p> Signup and view all the answers

    Which of the following factors primarily controls the permeability of a reservoir?

    <p>Grain size</p> Signup and view all the answers

    What is the equation for Darcy's Law, which describes the flow of fluid through a porous medium?

    <p>$q = \frac{k \Delta P A},{\mu L}$</p> Signup and view all the answers

    What is the main objective of reservoir appraisal?

    <p>To estimate the hydrocarbon reserves in the reservoir</p> Signup and view all the answers

    What is the purpose of a Drill Stem Test (DST) in oil exploration?

    <p>To evaluate the productivity of the reservoir</p> Signup and view all the answers

    Which factor primarily controls the net-to-gross ratio in a reservoir?

    <p>Depositional environment</p> Signup and view all the answers

    What is the equation for calculating pore pressure in a reservoir?

    <p>$P_{Hydrostatic} = \rho_{water}gh$</p> Signup and view all the answers

    What is the equation for capillary pressure in a reservoir?

    <p>$PC = (\rho_o - \rho_w)gh$</p> Signup and view all the answers

    What is the relationship between capillary pressure and water saturation in a reservoir?

    <p>Capillary pressure increases as water saturation decreases</p> Signup and view all the answers

    Which of the following is NOT a factor that influences the gross rock volume of a reservoir?

    <p>Capillary pressure</p> Signup and view all the answers

    What is the equation for calculating the ideal permeability from semilog plots of DST and production data?

    <p>$\Delta t = \frac{tp},{\sqrt{k}}$</p> Signup and view all the answers

    What is the main purpose of well testing analysis methods?

    <p>To analyze pressure drawdown and build-up data</p> Signup and view all the answers

    What is the equation for calculating the productivity index (PI) in well testing?

    <p>$PI = \frac{q},{\Delta P}$</p> Signup and view all the answers

    Study Notes

    Reservoir Characteristics

    • Gross rock volume of a reservoir is influenced by factors such as depositional environment, diagenesis, and tectonics
    • The characteristic of fluids in a reservoir that is important to consider is their wettability

    Hydrocarbon in Place

    • Hydrocarbon in place is crucially dependent on the pore volume of the reservoir rock
    • Pore volume is a function of porosity, which is controlled by factors such as cementation, compaction, and dissolution

    Permeability

    • Permeability is a characteristic of the rock that controls the flow of fluid through it
    • Darcy's Law describes the flow of fluid through a porous medium and is represented by the equation Q = (kAΔP)/μL
    • Permeability is primarily controlled by the size and distribution of pore throats in the rock

    Capillary Pressure

    • Capillary pressure is defined as the pressure difference between two immiscible fluids in a porous medium
    • Capillary pressure is related to water saturation and is described by the Young Laplace Equation
    • The equation for capillary pressure in a reservoir is Pcap = 2σcosθ/r

    Well Testing

    • The purpose of a Repeat Formation Tester (RFT) is to measure the pressure response of the reservoir to a series of flow and shut-in periods
    • A Drill Stem Test (DST) is performed to evaluate the reservoir's potential and to obtain information about the reservoir's properties
    • The main objective of reservoir appraisal is to determine the hydrocarbon in place and the producibility of the reservoir

    Reservoir Performance

    • The likely performance of the reservoir during production is influenced by factors such as permeability, porosity, and wettability
    • The pressure regime in a reservoir is controlled by the balance between the injection and production of fluids

    Reservoir Properties

    • The main factor controlling porosity in a rock is the balance between compaction, cementation, and dissolution
    • The productivity index (PI) is used in well testing to evaluate the ability of the well to produce fluids

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