Gas-Liquid Separation: Stage Separation
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Questions and Answers

What is the purpose of performing a flash calculation under the given separator conditions?

  • To determine the mole fractions of the components in the liquid and vapor phases (correct)
  • To calculate the physical properties of the components in the separator
  • To optimize the gas-to-oil ratio (GoR) of the separation process
  • To determine the optimal pressure and temperature for the separation process

    • Which of the following is NOT a property that is calculated in the flash calculation?

  • Molecular weight (Mw)
  • Density (𝜌)
  • Bubble point temperature (correct)
  • Volume (V)

    • What is the purpose of the low-temperature separation process mentioned in the text?

  • To reduce the pressure of the inlet wellstream
  • To increase the gas-to-oil ratio (GoR) of the separation process
  • To increase the liquid recovery from the inlet wellstream (correct)
  • To remove water and hydrocarbon liquids from the inlet wellstream

    • What is the purpose of the high-pressure separator mentioned in the low-temperature separation unit?

    <p>To separate the water and hydrocarbon liquids from the gas</p> Signup and view all the answers

    What is the relationship between the mole fractions of the components in the liquid and vapor phases (xi and yi) that is determined in the flash calculation?

    <p>xi and yi are related by the equilibrium ratio (Ki) for each component</p> Signup and view all the answers

    Which of the following is NOT a parameter given in the separator conditions for the flash calculation?

    <p>Bubble point pressure</p> Signup and view all the answers

    How can the apparent molecular weights of liquid phase (MWa L) and vapor phase (MWa v) be calculated?

    <p>Using the specific gravity of stock-tank oil and solution gas</p> Signup and view all the answers

    What does equation (17) minus equation (20) provide in the context of the text?

    <p>The number of moles in the vapor phase</p> Signup and view all the answers

    Which parameter can be used to estimate the liquid phase density according to Standing's method?

    <p>Gas solubility of the oil</p> Signup and view all the answers

    What does substituting equation (7) into equation (14) help calculate?

    <p>The number of moles in the liquid phase</p> Signup and view all the answers

    In the context of the text, how can xi and yi be calculated?

    <p>Applying equation (16) and (19)</p> Signup and view all the answers

    What is the purpose of combining equation (22) and equation (13)?

    <p>To solve for the number of moles in the vapor phase</p> Signup and view all the answers

    What is the primary purpose of using multiple separation stages in hydrocarbon processing?

    <p>To maximize the recovery of hydrocarbon liquids from the wellstream</p> Signup and view all the answers

    How many separators and storage tanks are required for a three-stage separation process?

    <p>Two separators and one storage tank</p> Signup and view all the answers

    What is the typical range of operating pressure for the first-stage separator in a hydrocarbon separation system?

    <p>600 to 1,200 psi</p> Signup and view all the answers

    What is the maximum number of separation stages typically required to obtain a stable stock-tank liquid?

    <p>4 stages</p> Signup and view all the answers

    What technique can be used to predict the performance of the separators in a multistage separation system?

    <p>Compositional computer models using the initial wellstream composition and operating conditions</p> Signup and view all the answers

    What is the primary advantage of using a stepwise reduction of pressure on the liquid condensate in high-pressure gas-condensate separation systems?

    <p>It increases the recovery of stock-tank liquids</p> Signup and view all the answers

    What is the recommended approach for determining the pressure at the first-stage separator when the flow line pressure (p) exceeds 600 psi?

    <p>Let the first-stage separator operate at the flow line pressure (p)</p> Signup and view all the answers

    What is the formula used to determine the pressures at the intermediate separation stages?

    <p>pi = P1 * (Rp)^(i / Nst)</p> Signup and view all the answers

    What is the liquid/vapor equilibrium ratio (Ki) used for in flash calculations?

    <p>To determine the quality of products from each separation stage</p> Signup and view all the answers

    Which of the following equations represents the definition of the liquid/vapor equilibrium ratio (Ki)?

    <p>Ki = xi / yi</p> Signup and view all the answers

    What is required for accurate determination of the liquid/vapor equilibrium ratios (Ki values) according to the text?

    <p>Computer simulators solving the Equation of State (EoS) for hydrocarbon systems</p> Signup and view all the answers

    Under what condition can the Standing (1979) equations be used to determine the liquid/vapor equilibrium ratios (Ki values) with reasonable accuracy?

    <p>When the pressure (p) is less than 1,000 psia</p> Signup and view all the answers

    What is the minimum required size of a standard oil/gas separator for the given conditions: gas flow rate of 4.0 MMscfd, gas-specific gravity of 0.7, condensate gas ratio (CGR) of 15 bbl/MMscf, condensate gravity of 65°API, operating pressure of 600 psig, and operating temperature of 70°F?

    <p>The minimum required size depends on the type of separator (vertical, horizontal, or spherical) and must be calculated separately for each type.</p> Signup and view all the answers

    In the three-stage separation process proposed for a well stream at a flow line pressure of 1,000 psia, what information is required to calculate the pressures at each stage of separation?

    <p>The temperature at each stage of separation, the composition of the well stream, and the desired pressure drop across each stage.</p> Signup and view all the answers

    In the flash calculations for the given separator conditions, what is the purpose of plotting the gas-oil ratio (GOR) and API gravity against the separator pressure?

    <p>To visualize the phase behavior of the well stream and understand the separation efficiency at different pressures.</p> Signup and view all the answers

    Based on the given composition of the well stream, which component has the highest mole fraction?

    <p>Methane (C1)</p> Signup and view all the answers

    What is the significance of the 'gas solubility Rs' value of 600 scf/STB in the given separator conditions?

    <p>It represents the amount of gas dissolved in the stock-tank oil at standard conditions.</p> Signup and view all the answers

    What is the significance of the 'nL/F' value of 0.1209 in the given separator conditions?

    <p>It is a correction factor for non-hydrocarbon components in the well stream.</p> Signup and view all the answers

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