JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV Year ENHANCED OIL RECOVERY TECHNIQUES Previous Question Paper (May/June - 2019 - R15)
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
Describe various objectives of EOR.
Answer
The primary objectives of Enhanced Oil Recovery (EOR) are to reduce residual oil saturation, improve microscopic displacement efficiency, enhance volumetric sweep efficiency, and ultimately increase the ultimate recovery factor of a reservoir beyond what is possible through primary and secondary recovery methods.
How tertiary recovery techniques are different from primary recovery techniques?
Answer
Primary recovery relies solely on the natural energy of the reservoir, such as fluid expansion or gas cap drive, to produce oil. In contrast, tertiary recovery (EOR) involves the injection of external fluids—such as chemicals, gases, or thermal energy—to alter the physical properties of the oil or the rock-fluid interaction, thereby mobilizing oil that remains trapped after primary and secondary stages.
Define sweep efficiency.
Answer
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Differentiate between CO2 and polymer flooding.
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What do you understand by residual oil saturation?
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Discuss the basic principle of In-situ combustion.
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Mention few surfactants used in chemical EOR.
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What is the role of surfactants in EOR?
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How microbial EOR is different than chemical EOR?
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Mention various environmental constraints associated with EOR.
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PART B
Differentiate between EOR and IOR.
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How do we choose reservoir candidates for gas injection?
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How carbonates reservoir are different than sandstone reservoirs?
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Comment on ultimate recovery factor.
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Define role and significance of mobility ratio.
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Calculate mobility ratio for following data: µw/ µo = 6; Ko = 50; Kw= 100
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Discuss the significance of ternary diagram in miscible flooding.
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Enumerate some of the agents used to achieve miscibility with oil in miscible flooding.
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Comment on the mechanisms suggested for oil displacement by alkaline flooding.
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State screening criteria for alkaline flooding.
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Discuss various process involve in In-situ combustion.
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Explain one displacement mechanism in alkaline flooding.
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Describe cyclic steam injection process.
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Explain the steam drive process with the help of neat diagram.
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Explain the screening criteria for steam flooding.
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How do you classify the EOR surfactants?
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Comment on the historical development of microbial enhancement of oil recovery.
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Discuss various challenges associated with the application of microbial EOR in field.
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Mention environmental risks associated with chemical flooding.
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Comment on the environmental concerns associated with alkaline flooding.
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