Name of Examination(Please tick, symbol is given)

: MID END SUPPLE

Name of the College(Please tick, symbol is given)

: COES CMES COLS

Program/Course : B. Tech APE

Semester : 8th

Name of the Subject : Well Stimulation

Subject Code :

Name of Question Paper Setter

: Dr. Ajay Suri

Employee Code :

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Note: Please mention additional Stationery to be provided, during examination such as Table/Graph Sheet etc. else mention “NOT APPLICABLE”:

FOR SRE DEPARTMENT Date of Examination :

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UNIVERSITY OF PETROLEUM & ENERGY STUDIESDEHRADUN

Final Semester Examination – April, 2014Program/course: BTECH APE Semester – 8th Subject: Well Stimulation Max. Marks : 50Code : Duration : 1 HrsNo. of page/s:

Example questions for Finals:

Course Content:Class PPT 1, 2, 3, 4, 5, 6Chapters 5, 6, 7, 8, 9 Reservoir Stimulation, EconomidesChapter 8 Oil Well Stimulation, Dr. Schechter

Section 1: History and Over-view on Hydraulic Fracturing

1. When did Hydraulic Fracturing first commercially applied? Name the field and well where it was applied first. 5 marks

Section 2: Stresses in the Earth

1. Show an example calculation of over-burden stress, pore pressure, total vertical stress, effective vertical stress, total horizontal stress and effective horizontal stress in the sub-surface at a depth of 5000 ft. 5 marks

2. How much is the tensile and compressive strength of sandstones? 5 marks

Section 3: Modeling of Hydraulic Fracturing

1. Write the flow equations for an elliptical and constant width hydraulic fracture of constant height. 10 marks

Section 4: Productivity of Hydraulic Fractures

1. What is the effective wellbore radius of an infinitely conductive hydraulically fractured well? 5 marks

2. What is the skin and rate improvement for a well that had an initial skin = 0 but is now hydraulically fractured with an infinitely conductive fracture length of 100 ft. Initial well bore radius = 0.5 ft, re = 5000 ft

5 marks

Section 5: Diagnostics of Hydraulic Fractures

1. Show BHP during hydraulic fracturing during injection phase. Show BHP after shut-in and mark breakdown pressure, shut-in pressure, closure pressure and reservoir pressure on the plot. 5 marks

Section 6: Fracturing Fluids

1. Name the two most common polymers and cross-linkers typically used in hydraulic fracturing. 5 marks

Section 7: Proppant Transport

1. Plot the proppant permeability as a function of closure stress for the 4 types of commonly used proppants in the industry. 5 marks