Reservoir Appraisal and its Impact on Oil Production

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

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

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

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

What is the purpose of steel casing in drilling operations?

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

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

A blowout (C) Signup and view all the answers

What is the purpose of the density of drilling mud in the well bore?

To balance the pore pressure in the formation (D) Signup and view all the answers

What happens if the pore pressure exceeds the sum of stress and intrinsic tensile strength of the rock?

The rock will fracture (A) Signup and view all the answers

What is the purpose of casing in drilling wells?

To isolate well sections (C) Signup and view all the answers

Which factors control the gross rock volume of a reservoir?

Shape of structure, dip of flanks, positions and throws of fault (C) Signup and view all the answers

Which of the following is a factor that affects the net:gross ratio of a reservoir?

Depositional environment, facies distributions, diagenesis (C) Signup and view all the answers

Which of the following is a factor that affects the porosity of a reservoir?

Depositional environment, facies distributions, diagenesis (D) Signup and view all the answers

Which of the following is a factor that affects the oil saturation of a reservoir?

Reservoir quality, capillary pressure (B) Signup and view all the answers

Which of the following is the correct formula for calculating the Stock Tank Oil Initially In Place (STOIIP)?

STOIIP = GRV * NTG * φ * SO * (1/BO) (D) Signup and view all the answers

What does the Gamma log measure?

Natural radioactivity produced by the rock (B) Signup and view all the answers

Which logging tool can be used to measure the porosity of a formation?

Formation Density log (D) Signup and view all the answers

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

Sw = (Rw / Rt) ^ (1/n) (B) Signup and view all the answers

Which of the following is a drilling rig used for exploration drilling?

All of the above (D) Signup and view all the answers

What is the purpose of cementing steel casing in place during drilling operations?

To isolate formations with different pore pressure regimes (A) Signup and view all the answers

Which of the following factors affects the gross rock volume of a reservoir?

All of the above (D) Signup and view all the answers

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

Increased pore pressure (B) Signup and view all the answers

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

$S_w = \left(\frac{a},{\phi^m}\right)^{-n}$ (A) Signup and view all the answers

What is the purpose of steel casing in drilling operations?

To isolate well sections with different mud weights (A) Signup and view all the answers

What happens if the pore pressure exceeds the sum of stress and intrinsic tensile strength of the rock?

The rock will fracture (B) Signup and view all the answers

Which of the following logging tools measures the hydrogen atom density of a formation?

Neutron (C) Signup and view all the answers

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

STOIIP = GRV * NTG * φ* SO * (1/BO) (A) Signup and view all the answers

What is the equation used to calculate the hydrocarbon saturation using Archie's Equation?

Sw = (Rt * φ) / (a * Rw) (A) Signup and view all the answers

What is the formula for calculating the Ultimate Recovery (UR) of a reservoir?

UR = STOIIP * RECOVERY FACTOR (C) Signup and view all the answers

Which of the following factors can affect the performance of a reservoir during production?

The pressure regime (C) Signup and view all the answers

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

STOIIP = Gross Rock Volume * Net:Gross Ratio * Porosity * Oil Saturation (D) Signup and view all the answers

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

To determine the fraction of the volume that is productive (A) Signup and view all the answers

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

The cashflow will be lower than expected (A) Signup and view all the answers

Which of the following drilling rigs is designed to be moved from one location to another by towing or being carried on a barge?

Jack-up (B) Signup and view all the answers

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

To remove cuttings from the wellbore (D) Signup and view all the answers

Which of the following factors affects the porosity of a reservoir?

Compaction factor (B) Signup and view all the answers

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

Increased pore pressure (C) Signup and view all the answers

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

$S_w = \left(\frac{a},{\phi^n}\right)^m$ (B) Signup and view all the answers

What is the purpose of the density of drilling mud in the well bore?

To balance the pore pressure in the formation (C) Signup and view all the answers

Which of the following factors can affect the performance of a reservoir during production?

All of the above (D) Signup and view all the answers

Which of the following factors can affect the hydrocarbon in place in a reservoir?

Depositional environment (A) Signup and view all the answers

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

To determine the fraction of the volume that is productive (D) Signup and view all the answers

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

The cashflow will be less than expected (D) Signup and view all the answers

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

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

Which of the following logging tools measures the porosity of a formation?

Neutron (D) Signup and view all the answers

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

To measure the ratio of net reservoir volume to gross reservoir volume (C) Signup and view all the answers

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

$Sw = \frac{R},{W} \phi$ (C) Signup and view all the answers

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

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

Reservoir Appraisal and its Impact on Oil Production

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Questions and Answers

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

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

What is the purpose of steel casing in drilling operations?

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

What is the purpose of the density of drilling mud in the well bore?

What happens if the pore pressure exceeds the sum of stress and intrinsic tensile strength of the rock?

What is the purpose of casing in drilling wells?

Which factors control the gross rock volume of a reservoir?

Which of the following is a factor that affects the net:gross ratio of a reservoir?

Which of the following is a factor that affects the porosity of a reservoir?

Which of the following is a factor that affects the oil saturation of a reservoir?

Which of the following is the correct formula for calculating the Stock Tank Oil Initially In Place (STOIIP)?

What does the Gamma log measure?

Which logging tool can be used to measure the porosity of a formation?

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

Which of the following is a drilling rig used for exploration drilling?

What is the purpose of cementing steel casing in place during drilling operations?

Which of the following factors affects the gross rock volume of a reservoir?

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

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

What is the purpose of steel casing in drilling operations?

What happens if the pore pressure exceeds the sum of stress and intrinsic tensile strength of the rock?

Which of the following logging tools measures the hydrogen atom density of a formation?

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

What is the equation used to calculate the hydrocarbon saturation using Archie's Equation?

What is the formula for calculating the Ultimate Recovery (UR) of a reservoir?

Which of the following factors can affect the performance of a reservoir during production?

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

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

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

Which of the following drilling rigs is designed to be moved from one location to another by towing or being carried on a barge?

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

Which of the following factors affects the porosity of a reservoir?

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

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

What is the purpose of the density of drilling mud in the well bore?

Which of the following factors can affect the performance of a reservoir during production?

Which of the following factors can affect the hydrocarbon in place in a reservoir?

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

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

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

Which of the following logging tools measures the porosity of a formation?

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

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

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

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