Reservoir Engineering Quiz
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Questions and Answers

What is the purpose of steel casing in drilling operations?

  • To modify the density of drilling mud
  • To isolate formations with different pore pressure regimes (correct)
  • To determine the porosity of the formation
  • To determine the saturation of the formation

Which drilling operation involves modifying the density of drilling mud to match the pore pressure of the formation?

  • Open Hole
  • Cementing casing
  • Mud circulation system (correct)
  • Drilling out cement

What equation is used to calculate the oil volume in place (STOIIP)?

  • Porosity / Oil saturation
  • Gross-rock volume / Net:gross ratio (correct)
  • Gross-rock volume * Net:gross ratio
  • Porosity * Oil saturation

Which of the following is a consequence of drilling into a highly permeable formation with an insufficient mud weight?

<p>A blowout (C)</p> Signup and view all the answers

What is the purpose of drilling mud density?

<p>To balance pore pressure in the formation and prevent blowouts (B)</p> Signup and view all the answers

What can cause a blowout during drilling?

<p>Drilling into a permeable formation with insufficient mud weight (B)</p> Signup and view all the answers

What does casing in drilling wells primarily help to achieve?

<p>Isolate well sections and maintain well integrity (A)</p> Signup and view all the answers

What affects the net:gross ratio of a reservoir?

<p>Depositional environment, facies distributions, and diagenesis (A)</p> Signup and view all the answers

What does the gamma log measure in a reservoir rock?

<p>Natural radioactivity produced by the rock (A)</p> Signup and view all the answers

What affects the porosity of a reservoir?

<p>Depositional environment, facies distributions, and diagenesis (B)</p> Signup and view all the answers

What is the formula for calculating Stock Tank Oil Initially In Place (STOIIP)?

<p>$STOIIP = GRV * NTG * \phi * SO * (1/BO)$ (B)</p> Signup and view all the answers

What does the Formation Density log measure in a reservoir rock?

<p>Porosity of a formation by measuring rock density (C)</p> Signup and view all the answers

What affects the oil saturation of a reservoir?

<p>Reservoir quality and capillary pressure (B)</p> Signup and view all the answers

What is the formula for calculating hydrocarbon saturation using Archie's Equation?

<p>$Sw = (Rw / Rt) ^ {1/n}$, where Sw is water saturation, Rt is formation resistivity, Rw is resistivity of formation water, and n is formation resistivity factor (A)</p> Signup and view all the answers

What is the formula for calculating hydrocarbon saturation using Archie's Equation?

<p>$Sw = (a/φ^m)^{-n}$ (D)</p> Signup and view all the answers

What is the purpose of the Net:Gross Ratio in reservoir appraisal?

<p>To determine the fraction of the volume that is productive (B)</p> Signup and view all the answers

What is the likely consequence of underestimating potential production rates in a reservoir?

<p>Lower cashflow than expected (D)</p> Signup and view all the answers

What is the formula for calculating Stock Tank Oil Initially In Place (STOIIP)?

<p>$STOIIP = GRV * NTG * φ* SO * (1/BO)$ (B)</p> Signup and view all the answers

What is the equation used to calculate the Ultimate Recovery (UR) of a reservoir?

<p>$UR = STOIIP * RECOVERY FACTOR$ (B)</p> Signup and view all the answers

What is the consequence of drilling into a highly permeable formation with insufficient mud weight?

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

What is the purpose of steel casing in drilling operations?

<p>To isolate well sections with different mud weights (C)</p> Signup and view all the answers

What factor can affect reservoir performance during production?

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

What logging tool measures the hydrogen atom density of a formation?

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

What is the likely consequence of pore pressure exceeding the sum of stress and intrinsic tensile strength of rock?

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

What are the factors affecting the gross rock volume of a reservoir?

<p>Net:gross ratio, porosity, and oil saturation (A)</p> Signup and view all the answers

What does Archie's Equation, $S_w = rac{a}{ ext{$ ho$}_w imes ext{$ ho$}_t imes ext{$ ho$}_m imes ext{$ ho$}_a}$, calculate in a reservoir?

<p>Hydrocarbon saturation (B)</p> Signup and view all the answers

What does the Neutron logging tool measure in a formation to calculate porosity?

<p>Hydrogen atom density (C)</p> Signup and view all the answers

What does the Net:Gross Ratio estimate in a reservoir?

<p>Proportion of productive volume compared to total volume (C)</p> Signup and view all the answers

What is the purpose of the mud circulation system during drilling operations?

<p>To remove cuttings from the wellbore (C)</p> Signup and view all the answers

How does compaction factor affect the porosity of a reservoir?

<p>By reducing pore space due to overlying sediments (D)</p> Signup and view all the answers

What can happen if drilling into a highly permeable formation with insufficient mud weight?

<p>Increased pore pressure and blowouts (B)</p> Signup and view all the answers

What is the purpose of balancing the density of drilling mud with pore pressure in the formation?

<p>To prevent blowouts (A)</p> Signup and view all the answers

What can affect the performance of a reservoir during production?

<p>Pore pressure, fracture pressure, and rock tensile strength (C)</p> Signup and view all the answers

What can affect the hydrocarbon in place in a reservoir?

<p>Depositional environment, fault positions, reservoir quality, and gas:oil ratio (A)</p> Signup and view all the answers

What does underestimating hydrocarbon production rates in a reservoir result in?

<p>Less than expected cashflow (B)</p> Signup and view all the answers

What does the formula for calculating the Stock Tank Oil Initially In Place (STOIIP) of a reservoir, $STOIIP = GRV imes NTG imes ext{$ ho$} imes SO imes (1/BO)$, take into account?

<p>Gross rock volume, Net:Gross Ratio, porosity, oil saturation, and formation volume factor (B)</p> Signup and view all the answers

Flashcards

Purpose of steel casing

To isolate well sections with different mud weights and maintain well integrity.

Mud circulation system

Drilling operation of adjusting drilling mud density to match formation pore pressure.

STOIIP Calculation

Gross-rock volume multiplied by Net-to-Gross ratio, porosity, oil saturation, and formation volume factor.

Blowout Cause

Drilling into a permeable formation with insufficient mud weight to balance pore pressure.

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Drilling Mud Density

Balances pore pressure in the formation and prevents blowouts.

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Net-to-Gross Ratio

The fraction of the volume of rock that is productive.

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Gamma Log

Measures natural radioactivity in reservoir rocks.

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Porosity Factors

Depositional environment, facies distributions, and diagenesis influence reservoir porosity.

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Formation Density Log

Measures rock density to calculate formation porosity.

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Hydrocarbon Saturation

Affected by reservoir quality and capillary pressure.

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Archie's Equation (Simplified)

Calculates water saturation in a reservoir.

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Ultimate Recovery (UR)

The total amount of recoverable hydrocarbons in a reservoir.

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Pore Pressure

Pressure within the rock pores.

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Gross Rock Volume (GRV)

The total volume of rock above and below the water table.

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Reservoir Performance

Dependent on pressure regime and other factors.

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Neutron Log

Measures hydrogen atom density in a formation to estimate porosity.

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Rock Fracture

Pore pressure exceeds the sum of stress and intrinsic tensile strength of rock.

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Study Notes

Oil and Gas Reservoir Engineering Summary

  • The mud circulation system is used to remove cuttings from the wellbore during drilling operations.
  • Compaction factor affects the porosity of a reservoir by reducing pore space due to overlying sediments.
  • Drilling into a highly permeable formation with insufficient mud weight can lead to increased pore pressure, resulting in blowouts and drilling hazards.
  • Archie's Equation, $S_w = \left(\frac{a}{\phi^n}\right)^m$, is used to calculate hydrocarbon saturation in a reservoir using formation factor, porosity, and empirical constants.
  • The density of drilling mud in the well bore is designed to balance the pore pressure in the formation to prevent blowouts.
  • Factors such as pore pressure, fracture pressure, and rock tensile strength can affect the performance of a reservoir during production.
  • Depositional environment, fault positions, reservoir quality, and gas:oil ratio can affect the hydrocarbon in place in a reservoir.
  • The Net:Gross Ratio is used to determine the fraction of the volume that is productive in a reservoir.
  • Underestimating hydrocarbon production rates in a reservoir can result in less than expected cashflow.
  • The formula for calculating the Stock Tank Oil Initially In Place (STOIIP) of a reservoir is $STOIIP = GRV \times NTG \times \phi \times SO \times (1/BO)$.
  • The Neutron logging tool measures the hydrogen atom density of a formation to calculate the porosity.
  • The Net:Gross Ratio is used to estimate the proportion of reservoir volume that is productive (net) compared to the total reservoir volume (gross).

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Reservoir Appraisal and Oil Production Quiz PDF

Description

Test your knowledge of oil and gas reservoir engineering with this summary quiz. Explore key concepts such as mud circulation, compaction factor, pore pressure, Archie's Equation, reservoir quality, and more.

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