45 Questions
Which drilling operation involves modifying the density of drilling mud to match the pore pressure of the formation?
Mud circulation system
What equation is used to calculate the oil volume in place (STOIIP)?
Gross-rock volume / Net:gross ratio
What is the purpose of steel casing in drilling operations?
To isolate formations with different pore pressure regimes
Which of the following is a consequence of drilling into a highly permeable formation with an insufficient mud weight?
A blowout
What is the purpose of the density of drilling mud in the well bore?
To balance the pore pressure in the formation
What happens if the pore pressure exceeds the sum of stress and intrinsic tensile strength of the rock?
The rock will fracture
What is the purpose of casing in drilling wells?
To isolate well sections
Which factors control the gross rock volume of a reservoir?
Shape of structure, dip of flanks, positions and throws of fault
Which of the following is a factor that affects the net:gross ratio of a reservoir?
Depositional environment, facies distributions, diagenesis
Which of the following is a factor that affects the porosity of a reservoir?
Depositional environment, facies distributions, diagenesis
Which of the following is a factor that affects the oil saturation of a reservoir?
Reservoir quality, capillary pressure
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)
What does the Gamma log measure?
Natural radioactivity produced by the rock
Which logging tool can be used to measure the porosity of a formation?
Formation Density log
What is the formula for calculating the hydrocarbon saturation using Archie's Equation?
Sw = (Rw / Rt) ^ (1/n)
Which of the following is a drilling rig used for exploration drilling?
All of the above
What is the purpose of cementing steel casing in place during drilling operations?
To isolate formations with different pore pressure regimes
Which of the following factors affects the gross rock volume of a reservoir?
All of the above
Which of the following is a consequence of drilling into a highly permeable formation with an insufficient mud weight?
Increased pore pressure
What is the formula for calculating the hydrocarbon saturation using Archie's Equation?
$S_w = \left(\frac{a},{\phi^m}\right)^{-n}$
What is the purpose of steel casing in drilling operations?
To isolate well sections with different mud weights
What happens if the pore pressure exceeds the sum of stress and intrinsic tensile strength of the rock?
The rock will fracture
Which of the following logging tools measures the hydrogen atom density of a formation?
Neutron
What is the formula for calculating the Stock Tank Oil Initially In Place (STOIIP)?
STOIIP = GRV * NTG * φ* SO * (1/BO)
What is the equation used to calculate the hydrocarbon saturation using Archie's Equation?
Sw = (Rt * φ) / (a * Rw)
What is the formula for calculating the Ultimate Recovery (UR) of a reservoir?
UR = STOIIP * RECOVERY FACTOR
Which of the following factors can affect the performance of a reservoir during production?
The pressure regime
What is the formula for calculating the Stock Tank Oil Initially In Place (STOIIP)?
STOIIP = Gross Rock Volume * Net:Gross Ratio * Porosity * Oil Saturation
What is the purpose of the Net:Gross Ratio in reservoir appraisal?
To determine the fraction of the volume that is productive
What is the likely consequence of underestimating potential production rates in a reservoir?
The cashflow will be lower than expected
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
What is the purpose of the mud circulation system in drilling operations?
To remove cuttings from the wellbore
Which of the following factors affects the porosity of a reservoir?
Compaction factor
Which of the following is a consequence of drilling into a highly permeable formation with an insufficient mud weight?
Increased pore pressure
What is the formula for calculating the hydrocarbon saturation using Archie's Equation?
$S_w = \left(\frac{a},{\phi^n}\right)^m$
What is the purpose of the density of drilling mud in the well bore?
To balance the pore pressure in the formation
Which of the following factors can affect the performance of a reservoir during production?
All of the above
Which of the following factors can affect the hydrocarbon in place in a reservoir?
Depositional environment
What is the purpose of the Net:Gross Ratio in reservoir appraisal?
To determine the fraction of the volume that is productive
What is the likely consequence of underestimating the hydrocarbon production rates in a reservoir?
The cashflow will be less than expected
What is the formula for calculating the Stock Tank Oil Initially In Place (STOIIP) of a reservoir?
$STOIIP = GRV \times NTG \times \phi \times SO \times (1/BO)$
Which of the following logging tools measures the porosity of a formation?
Neutron
What is the purpose of the Net:Gross Ratio in reservoir appraisal?
To measure the ratio of net reservoir volume to gross reservoir volume
What is the formula for calculating the hydrocarbon saturation using Archie's Equation?
$Sw = \frac{R},{W} \phi$
What is the formula for calculating the Stock Tank Oil Initially In Place (STOIIP)?
$STOIIP = GRV * NTG * \phi * SO * (1/BO)$
Test your knowledge on reservoir appraisal and its impact on oil production rates and cash flow during the field life cycle. Assess your understanding of how successful appraisal leads to informed development decisions and cost-effective facility design. Explore the consequences of overdesigning infrastructure in case the final production volume falls short of expectations.
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