## 57 Questions

Which factor influences the gross rock volume of a reservoir?

Depositional environment

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

Gas:Oil ratio

Which parameter is crucial to determine the hydrocarbon in place?

Depositional environment

Which factor controls the gross rock volume of a reservoir?

All of the above

What is the likely performance of the reservoir during production?

High hydrocarbon production rates

What is the pressure regime in a reservoir?

Pore pressure

What is capillary pressure in a reservoir?

Oil pressure minus water pressure

Which of the following is a characteristic of permeability?

The ability of the rock to transmit fluid

What is the equation for Darcy's Law?

$q = \frac{k \Delta P},{\mu L A}$

What is the main factor controlling porosity in a rock?

Grain size

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

To determine the flow rate of oil

Which type of tests are performed during a DST?

Both closed and open tests

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

Horner time

What are the objectives of reservoir appraisal?

Assessing reservoir performance and production rates

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

H2S affects fluid recovery and barium causes scale precipitation

Which equation represents the Young Laplace Equation?

$PO - PW = \sigma(\frac{1}{R1} + \frac{1}{R2})$

Capillary pressure is defined as:

oil pressure minus water pressure

What is the relationship between capillary pressure and water saturation?

For the same interfacial tension, smaller radius of curvature leads to higher capillary pressure

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

To record fluid pressure at different depths to establish likely fluid contacts

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

Both pressure drawdown and build-up

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

Horner time

What is the main objective of reservoir appraisal?

To evaluate reservoir performance and characteristics

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

They can cause issues such as toxicity and scale precipitation

Which of the following is NOT a characteristic of permeability?

Influenced by the viscosity of the fluid

What is the equation for Darcy's Law?

$q = \frac{K \Delta P},{\mu L A}$

What is the likely performance of the reservoir during production?

High porosity and high permeability

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

To collect fluid samples from the reservoir

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

Capillary pressure

What is the equation for pore pressure in a reservoir?

$P_{Pore} = P_{Hydrostatic} - P_{Lithostatic}$

What is the equation for capillary pressure in a reservoir?

$PC = (\rho_o - \rho_w)gh$

What is the characteristic of reservoir rock wettability?

Water-wet

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

$PO - PW = \sigma(\frac{1}{R1} + \frac{1}{R2})$

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

Drainage is the decrease of the wetting phase saturation, while imbibition is the increase of the wetting phase saturation.

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

To establish the likely fluid contacts at different depths.

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

Depositional environment and facies distributions.

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

$Q = \frac{kA}{\mu}\frac{\Delta P}{L}$

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

Shape of structure

What is the main objective of reservoir appraisal?

To determine the hydrocarbon in place

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

$P_c = \frac{{2\gamma}},{{r}}$

What is the equation for pore pressure in a reservoir?

$P_p = \rho gh$

What is the equation for capillary pressure in a reservoir?

$P_c = \frac{{\gamma}},{{r^2}}$

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

$PO - PW = \sigma( \ rac{1},{R_1} + \ rac{1},{R_2})$

What is the characteristic of reservoir rock wettability?

Mixed-wet

What is the likely performance of the reservoir during production?

High hydrocarbon production rates

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

Depositional environment

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

Grain size

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

$q = \frac{k \Delta P A},{\mu L}$

What is the main objective of reservoir appraisal?

To estimate the hydrocarbon reserves in the reservoir

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

To evaluate the productivity of the reservoir

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

Depositional environment

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

$P_{Hydrostatic} = \rho_{water}gh$

What is the equation for capillary pressure in a reservoir?

$PC = (\rho_o - \rho_w)gh$

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

Capillary pressure increases as water saturation decreases

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

Capillary pressure

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

$\Delta t = \frac{tp},{\sqrt{k}}$

What is the main purpose of well testing analysis methods?

To analyze pressure drawdown and build-up data

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

$PI = \frac{q},{\Delta P}$

## 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

Test your knowledge on the interface between two fluids and the Young Laplace equation with this quiz! Explore concepts like capillary pressure, interfacial tension, and the relationship between radius of curvature and pressure. Challenge yourself and see how well you understand the fascinating world of fluid dynamics.

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