JNTU
JNTU B.Tech III WELL LOGGING AND FORMATION EVALUATION Previous Question Paper (November/December - 2018 - R16)
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 a short note about core analysis.
Answer
Core analysis involves the physical examination and laboratory testing of rock samples retrieved from the subsurface. It provides direct measurements of porosity, permeability, fluid saturation, and grain density, serving as the ground-truth calibration data for interpreting wireline log responses.
Describe in a diagram different components of wire line logging.
Answer
The wireline logging system consists of three main components: the downhole logging tool (sonde) containing sensors, the wireline cable (armored multi-conductor cable) for data transmission and mechanical support, and the surface equipment (winch unit and computer system) for data acquisition, processing, and recording.
Which tool would you prefer to use across a high resistive oil bearing zone?
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Explain the principle of the Laterolog tools.
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How to determine the primary porosity by sonic logging tool?
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What is API count?
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Give short note about the production log.
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Explain the image logging tools and how are lithologies determined using well logs.
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What is mid plot?
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What are the advanced tools in well logging?
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Part B
Write short notes on the following:
Logging problems in deviated wells and geosteering.
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Overpressure in the formation.
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What is the classification of well logging methods?
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Explain the empirical relationship between water resistivity, porosity and water saturation.
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Calculate the porosity and oil saturation if:
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What is the effect of shales on the resistivity, density, neutron and borehole?
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Why do we need different types of resistivity tools? Describe the principle and commonly used tools in electrical resistivity logging.
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Explain the principle and applications of neutron tool.
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Calculate the resistivity of the formation water in the well, Rw, using the sand @ 6048’ – 6054’. Assume that the value of Vsh in the interval = 0.23. The porosity logs should be corrected for shale in determining the effective porosity.
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How do you determine primary and secondary porosity? Explain.
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Design a tubing string for a 9,000-ft hydro pressured vertical well that is relatively straight, that will be used to flow 500 BOPD, and that will be completed inside 4 1/2-11.60-K55 casing. The well is to be completed with compression-set type packer and 9.0 ppg inhibited salt water in annulus. An over pull to free the packer of 15,000 lbf is anticipated. A maximum surface-treating pressure of 3,000 psi is expected.
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What is the principle and applications of Cased hole resistivity logging? Describe them.
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What is the difference between natural and spectral Gamma Ray logs? Explain the qualitative and quantitative application of each of them.
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What is the working principle of Spinner flow meter and give its applications?
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What is the difference between Nuclear magnetic resonance log and Scanner logs?
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What are cross-plots? And how can water saturation tell you about a zone.
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Explain the determination of Resistivity of water (Rw) by using porosity-resistivity plot (Hingle plot).
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