PANDIT DEENDAYAL PETROLEUM UNIVERSITY

PANDIT DEENDAYAL PETROLEUM UNIVERSITY

SCHOOL OF PETROLEUM TECHNOLOGY

MID-SEMESTER EXAMINATION

M.TECH. SEMESTER II, Session 2013-14Course(Code): Well Test Analysis(MPE112T)Date: 24.02.2014Time: 2 hours

Max. Marks: 50Instructions to students:

1. --- Answer all questions 2. --- Answer should be to the point and precise3. --- Draw diagram wherever necessary

Q. No. 1. Answer the following: 45 =20(a) Pressure and pressure derivative information from a well test data provides important information of reservoir characteristics - justify the statement.(b) The pressure drop in the well during the pressure transient test mainly reflects the reservoir properties in the compressible zone explain the statement with proper justification.

(c) Describe in detail how is a well test conducted in a vertical well?(d) The Ei-function solution to the diffusivity equation assumes line source well and predicts the pressure response in the reservoir as a function of both time t and distance from the center of the wellbore r where r(rw and given by the following equation

Why we need to approximate the Ei function for different values of t and r? Q. No. 2.

(a) What is pressure transient testing of wells (well testing)? Write down the generalized concepts behind well testing. Give a brief account of information gathered from different types of well tests. 8 Page 1/2

(b) What do you understand by well bore storage effect in transient well tests? For naturally eruptive wells and pumping wells the well bore storage effects are different justify. How do you understand the well bore storage effect in bottom hole pressure drop ((P) versus time (t) graph of well test data. 7

Q. No. 3. (a) Comment on the sequence of different test conducted in the following diagram of a Pressure Transient Test 5

(b) Write notes on: 5+5=10

(i) Electronic Memory Gauges for down hole P & T measurements

(ii) Skin

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