JNTU
JNTU B.Tech IV WELL COMPLETIONS, TESTING AND SERVICING Previous Question Paper (December - 2019 - 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 and may have a, b as sub questions.
Part A
What is the well testing?
Answer
Well testing is the process of measuring the pressure, temperature, and flow rate of a well over a period of time to evaluate the reservoir's capacity, fluid properties, and the condition of the wellbore-formation interface.
Explain briefly the bore wall stability.
Answer
Borehole stability refers to the ability of the wellbore to maintain its shape and structural integrity during and after drilling. It depends on the balance between the mechanical stresses exerted by the surrounding rock formation and the hydrostatic pressure applied by the drilling fluid (mud weight). Instability often leads to hole collapse, stuck pipe, or lost circulation.
Write a short note on the liner completion.
Answer
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What is closed hole well completion?
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Give a short note on the annular fluids.
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Write the classification of main packer:
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What is the coiled tubing?
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What is the stretch in tubing?
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Write a short note on the injector head.
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Explain a brief note on the well stimulation.
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Part B
What are the factors influencing completion design? And explain them.
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Give the main purpose of development wells? And explain different types of development wells.
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Explain in detail various components of production well head.
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Describe the cased hole completions with neat diagrams.
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Explain how to installing the Christmas tree and bringing the well on stream.
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What are the general considerations of the flowing well equipment with neat diagram?
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What are the advantages and drawbacks of permanent packers?
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Describe briefly the hydraulically set retrievable packers with neat diagram.
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Give a brief note about the SCSSV. And explain how to setting and testing the SCSSV.
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Describe briefly the sliding sleeve circulating valve with neat diagram.
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Design tubing for a relatively deep sweet-oil well. Make a dual grade tubing-string design (to reduce cost). Assume the following conditions: casing designation = 7-26.00-N80; Dm = 11,000 ft; DtV = 11,000 ft; desired flow rate under gas lift conditions = 1,500 B/D from 10,000 ft; pww = 5,000 psi; pwh = 5,000 psi; pbh = 6,200 psi; Tbh = 200°F; Tsf = 125°F; completion fluid in annulus, wf, = 11.0 ppg of inhibited solids free salt water; fluid gradient, gf, = 0.052 × wf = 0.572 psi/ft; packer shear pins setting = over pull (Fop) = 50,000 lbf. The well is relatively straight with small drag forces while pulling, and it is to be circulated with salt water before pulling tubing. Assume Fd = 0. Clearly mention any made assumptions if necessary.
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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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Describe in detail the coiled tubing equipment with neat diagram.
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Explain in the horizontal well completions.
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What are the applications and objectives of well servicing?
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Explain in detail the work over equipment wireline.
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