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JNTU B.Tech III WELL LOGGING Previous Question Paper (November/December - 2018 - R15)

B.Tech | III | I | R15 | November/December - 2018

Answer PaperPaper Code: 125DAMaximum Marks: 75Time: 3 hours

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 and may have a, b, c as sub questions.

Part A

Answer all questions.

25 marks

Why are well logs used?

2 marks

Answer

Well logs are used to obtain continuous, depth-related measurements of physical properties of subsurface formations, enabling the identification of lithology, evaluation of porosity and fluid saturation, and correlation of geological strata between wells.

What is the principle of SP log?

3 marks

Answer

The Spontaneous Potential (SP) log measures the natural electrical potential difference between a movable electrode in the borehole and a fixed reference electrode at the surface. This potential is primarily generated by electrochemical and electrokinetic processes occurring at the interface between the drilling mud and the formation water, reflecting differences in salinity.

What is resistivity?

2 marks

Answer

Explain about Delaware affect.

3 marks

Answer

How are sonic logs used in seismic investigations?

2 marks

Answer

What are the basic equations used in analyzing porosity logs?

3 marks

Answer

What logs are run for production purposes?

2 marks

Answer

What are the advanced tools in well logging?

3 marks

Answer

What is an invaded and uninvaded zone?

2 marks

Answer

What are cross-plots and why are they used?

3 marks

Answer

Part B

210 marks

What are the basic equations used in analyzing gamma ray logs? And how do gamma ray logs help with decision-making? Explain.

5 marks

Answer

Explain about Electrokinetic potential and electrochemical potential.

5 marks

Answer

310 marks

What are the advantages of an SP log? And how can you determine resistivity with an SP log?

5 marks

Answer

What are factors affecting the Gamma ray response and calibrate the gamma ray tool?

5 marks

Answer

410 marks

What is the difference between DLL tool and MSFL tool? Describe.

5 marks

Answer

What is principles and advantages of Induction log? Discuss.

5 marks

Answer

510 marks

What Criteria for selection of Induction and Lateral logging tool? Discuss.

5 marks

Answer

What is the principles and limitations of Focused resistivity tool? Explain.

5 marks

Answer

Explain the principle and applications of sonic log.

10 marks

Answer

710 marks

What is Neutron logging and how can you determine the porosity from neutron log?

5 marks

Answer

What is the principle of Acoustic logging and give reasons for increasing/decreasing velocity in alter zone?

5 marks

Answer

810 marks

How can you determine the fluid saturation behind casing by various logs?Discuss.

5 marks

Answer

Explain about Free point locater and plug setting.

5 marks

Answer

910 marks

What is production logging and explain well problem identification with neat sketch? Describe.

5 marks

Answer

Name the different types of advanced well logging tools with its applications.

5 marks

Answer

1010 marks

How can you identify the Lithology and Porosity by using density-neutron plot?

5 marks

Answer

Explain briefly about Conventional coring and Side wall coring.

5 marks

Answer

1110 marks

What is the difference between SARABAND and CORIBAND models? Explain.

5 marks

Answer

What types of logs are used to identifying Fracture formation? Discuss.

5 marks

JNTU B.Tech III WELL LOGGING Previous Question Paper (November/December - 2018 - R15)

Part A

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Part B

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