Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III DRILLING TECHNOLOGY 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
How the drilling walls are classified?
Answer
Drilling walls are generally classified based on their stability and the method of support into two categories: stable formations, which do not require support, and unstable or caving formations, which require support through casing, liners, or drilling fluid additives.
What are the advantages of PCD –bits?
Answer
- High wear resistance and thermal stability compared to conventional bits.
- Increased rate of penetration (ROP) in hard and abrasive formations.
- Longer bit life, which reduces the number of trips required for bit replacement, thereby lowering operational costs.
What is the need of drilling fluid?
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What are the advantages of additives in cement?
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What is the need of directional drilling?
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Describe about the minimum curvature method in directional drilling.
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What problems will be created due in- adequate clearing of bore?
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What are the reasons for formation of steeck-pipe?
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How the fluid samples are collected in drill-stemtest?
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What is the effect of reservoir pressure?
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Part B
What are the various service persons and consultants needed during drilling of a well?
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Explain with a schematic diagram about the drilling organization for effective functioning.
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Sketch and explain the construction and working of Rig power system used in practice?
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What are the advantages and drawbacks of hoisting and breaking of heavy strings of pipe?
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What are the various chemical additives are mixed to remove inest solids, diluting the chemicals?
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What are the methods used for solid control for weighted muds?
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How the strength, soundness and fineness tests be performed on the cement and explain about their importance?
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What is the effect of Hydrostatic pressure in fluid columns and explain its effect on entrained solids and gases?
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How the directional well-trajector is planned and explain about Build-and-Hold trajectory?
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What are the various methods used to calculate the trajectory of a well and explain about tangential method.
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What are the various factors to be considered in the directional drilling of wells and its trajectory?
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What is meant by ‘Nudging’ and explain about the techniques for Nudging?
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What are the variables responsible in stuck-pipe formation and explain about the effect of coefficient of friction?
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Explain about Reactive formations and unconsolidated formations of stuck –Pipe.
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What are the effects of swabbing of formation and insufficient mud-density on performance of drilling?
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What are the precautions to be taken during connections and while stripping to control kick?
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What are the various tests performed before drilling is planned?
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What are the various tests performed continuous during drilling to avoid problems?
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What are the various methods used to treat the waste fluids before it is used for certain applications?
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What are the methods used to separate solid particles from waste fluids and explain about separation by sereens?
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