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?

  • 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?

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

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

    <p>To balance the pore pressure in the formation</p> Signup and view all the answers

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

    <p>The rock will fracture</p> Signup and view all the answers

    What is the purpose of casing in drilling wells?

    <p>To isolate well sections</p> Signup and view all the answers

    Which factors control the gross rock volume of a reservoir?

    <p>Shape of structure, dip of flanks, positions and throws of fault</p> Signup and view all the answers

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

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

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

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

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

    <p>Reservoir quality, capillary pressure</p> Signup and view all the answers

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

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

    What does the Gamma log measure?

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

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

    <p>Formation Density log</p> Signup and view all the answers

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

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

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

    <p>All of the above</p> Signup and view all the answers

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

    <p>To isolate formations with different pore pressure regimes</p> Signup and view all the answers

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

    <p>All of the above</p> 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?

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

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

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

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

    <p>The rock will fracture</p> Signup and view all the answers

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

    <p>Neutron</p> Signup and view all the answers

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

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

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

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

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

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

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

    <p>The pressure regime</p> Signup and view all the answers

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

    <p>STOIIP = Gross Rock Volume * Net:Gross Ratio * Porosity * Oil Saturation</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</p> Signup and view all the answers

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

    <p>The cashflow will be lower than expected</p> 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?

    <p>Jack-up</p> Signup and view all the answers

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

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

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

    <p>Compaction factor</p> 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?

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

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

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

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

    <p>To balance the pore pressure in the formation</p> Signup and view all the answers

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

    <p>All of the above</p> Signup and view all the answers

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

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

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

    <p>The cashflow will be less than expected</p> Signup and view all the answers

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

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

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

    <p>Neutron</p> Signup and view all the answers

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

    <p>To measure the ratio of net reservoir volume to gross reservoir volume</p> Signup and view all the answers

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

    <p>$Sw = \frac{R},{W} \phi$</p> Signup and view all the answers

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

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

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