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 (D)</p> Signup and view all the answers

What is the likely performance of the reservoir during production?

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

What is the pressure regime in a reservoir?

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

What is capillary pressure in a reservoir?

<p>Oil pressure minus water pressure (C)</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 (D)</p> Signup and view all the answers

What is the equation for Darcy's Law?

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

What is the main factor controlling porosity in a rock?

<p>Grain size (B)</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 (C)</p> Signup and view all the answers

Which type of tests are performed during a DST?

<p>Both closed and open tests (C)</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 (D)</p> Signup and view all the answers

What are the objectives of reservoir appraisal?

<p>Assessing reservoir performance and production rates (A)</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 (B)</p> Signup and view all the answers

Which equation represents the Young Laplace Equation?

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

Capillary pressure is defined as:

<p>oil pressure minus water pressure (B)</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 (B)</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 (A)</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 (A)</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 (D)</p> Signup and view all the answers

What is the main objective of reservoir appraisal?

<p>To evaluate reservoir performance and characteristics (A)</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 (C)</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 (B)</p> Signup and view all the answers

What is the equation for Darcy's Law?

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

What is the likely performance of the reservoir during production?

<p>High porosity and high permeability (C)</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 (D)</p> Signup and view all the answers

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

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

What is the equation for pore pressure in a reservoir?

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

What is the equation for capillary pressure in a reservoir?

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

What is the characteristic of reservoir rock wettability?

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

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

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

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

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

What is the main objective of reservoir appraisal?

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

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

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

What is the equation for pore pressure in a reservoir?

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

What is the equation for capillary pressure in a reservoir?

<p>$P_c = \frac{{\gamma}},{{r^2}}$ (C)</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>$PO - PW = \sigma( \ rac{1},{R_1} + \ rac{1},{R_2})$ (C)</p> Signup and view all the answers

What is the characteristic of reservoir rock wettability?

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

What is the likely performance of the reservoir during production?

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

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

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

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

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

What is the main objective of reservoir appraisal?

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

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

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

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

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

What is the equation for capillary pressure in a reservoir?

<p>$PC = (\rho_o - \rho_w)gh$ (D)</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 (D)</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 (A)</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>$\Delta t = \frac{tp},{\sqrt{k}}$ (B)</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 (B)</p> Signup and view all the answers

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

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

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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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