JNTU
JNTU B.Tech III SURFACE PRODUCTION OPERATIONS Previous Question Paper (December - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
PART - A
Write the devices used for the temperature and pressure control.
Answer
Temperature control devices include thermostats, heat exchangers, and temperature control valves (TCVs). Pressure control devices include pressure relief valves (PRVs), pressure regulators, and back-pressure control valves.
Write the criteria for the selection of stage separation.
Answer
The selection of stage separation is based on: 1) Maximizing the recovery of stock tank oil by minimizing light-end losses, 2) Minimizing the gas-oil ratio (GOR) and power requirements for gas compression, and 3) Achieving the desired API gravity and vapor pressure of the final crude product.
What is the effect of formulation of emulsion in the separators?
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Write a short note on Plugging of mist extractor.
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Explain the effect of heating on oil dehydration process.
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What are the objectives of oil dehydration process?
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Explain the function of crude oil stabilization operation.
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Describe the principle of stripping operation for crude oil stabilization.
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Discuss the reasons for treating produced water that will be used for generating steam for thermal recovery operations.
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Discuss the advantages and disadvantages of treating produced water under pressure.
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PART - B
Given that 35MMSCF of wet gas is fed into a packed bed of desiccant. The gas molecular weight is 18.0 and its density is 1.5 lbs/ft3. The operating temperature is 110 F and pressure is 500 psia. The inlet dew point is 100 F and Find the desired outlet dew point (1 ppm H2O)?
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Explain the operation of a control valve.
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Give gas 98 MMscfd at 0.67 SG, sat w/water at 1000 psig, 100 F; dehydrated to 7 lb/MMscf; use triethylene glycol; no stripping gas, 98.5% TEG; Cd (contactor) = 0.852, Tcr = 376 R, Pcr = 669 psia.
Calculate contactor diameter.
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Determine the glycol circulation rate and estimate reboiler duty.
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Determine the actual gas and oil capacity of a 36-in. -diameter by 12-ft seam-to-seam length vertical separator operating under the following conditions: Gas specific gravity: 0.6, Oil gravity: 350 API, Operating pressure: 985 psi, Operating temperature: 60 F, Retention time: 3 min, Cd=1.1709
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Explain the procedure for design of a horizontal separator to handle the field production.
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Determine the diameter and seam-to-seam length of a three-phase vertical separator for the following operating conditions: Oil production rate: 6000BPD, Water production rate: 3000BPD, Gas production rate: 8.0MMSCFD, Oil viscosity: 10 cP, Oil specific gravity: 0.87, Water specific gravity: 1.07, Gas specific gravity: 0.6, Gas compressibility: 0.88, Operating pressure: 500 psia, Operating temperature: 90 F, Oil retention time: 10 min, Water retention time: 10 min, Cd: 0.64
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Explain the operating problems of a vertical separator.
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Discuss and compare the effects of temperature, oil viscosity, and retention time on the water droplet size that can be removed from the oil to achieve certain dehydration goal.
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Explain the sizing procedures for determining the minimum size of the coalescing/settling section of the treater and the rating of the burner.
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Determine the heat requirement and the size of the settling/coalescing section of a horizontal heater treater for the following conditions: Oil flow rate: 7000BPD, Inlet B.S.&W.: 15%, Outlet B.S.&W.: 1%, Oil specific gravity: 0.86, Oil viscosity: 45 CP at 85 F, 20 CP at 105 F, 10 CP at 125 F, Water specific gravity: 1.06, Specific heat of oil: 0.5 Btu/lb F, Specific heat of water: 1.1 Btu/lb F, Inlet temperature: 85 F, Retention time: 20 min, Treating temperature: Examine 105 F, 125 F and no heating.
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Explain the procedure for Selection and Injection of Chemicals for oil treating.
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Explain why desalting takes place after and not during the dehydration (emulsion treatment) process.
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Describe how stabilization by flashing is achieved. Under what conditions this method of stabilization could be used.
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A two-stage desalting unit is used to treat 100,000BPD of net oil. The oil entering the first stage contains 3% water having 280,000 ppm salt and 1.07 specific gravity. The oil is mixed with recycled water from the second stage (mixing efficiency= 80%) and dehydrated down to 1% water content. In the second stage, the oil is mixed with 7000 bbl of water having 3000 ppm salt and a specific gravity of 1.02 (mixing efficiency=80%) and is then dehydrated down to 0.1% water content and salt content of 10 PTB.
Draw a flow diagram of the described process.
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Determine the salinity [in lb of salt/bbl of water (lbs/bblw)] at all points.
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Determine the salt content of the oil (in PTB) at all points.
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Determine the amounts or recycled water and disposed water for the two stages.
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If only a one-stage desalting unit was used, determine the amount of dilution water needed to produce the same final oil quality as for the two-stage unit.
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Design the water treatment and disposal facilities for an offshore production and treatment platform for the conditions listed. Perform the design calculations for all types of treatment and disposal equipment discussed in this chapter and then determine the best combination of facilities giving reasons for your decisions. Produced water rate: 12,000 BPD, Oil content: 2000 mg oil/L water, Maximum oil droplet size: 500 µm, Required treated water quality: 70 mg/L, Dissolved oil: 25 mg/L, Water specific gravity: 1.074, Oil specific gravity: 0.89, Water viscosity: 1.03 cP, Treating temperature: 70 F, Platform area: 4500 ft2, Average annual rainfall rate: 1.7 in./h, Available washdown hose: 50 gpm.
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Discuss the effects of the various parameters in the settling equation on the efficiency of separating oil droplets from produced water. Discuss possible means of controlling these parameters to improve the separation (treatment) process.
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Describe the functions of the parallel plates interceptors equipment in promoting efficient produced water treatment.
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