Tutorials_1_DDT oil and gas industry exp

النفط والغاز المستوى الرابع

1. Drawdown Test
Tutorial-1
By Eng.MAbbas

2. q
t
P
wf
Produce well
at constant
rate
Plot
pressure
response
Lower
sensor
into well
Drawdown Test
By Eng.MAbbas

3. By Eng.MAbbas

4. EXAMPLE 1: CONSTANT-RATE FLOW TEST
Estimate:
a)Formation permeability
b)Skin Factor
c)Pressure drop due to skin
d)Flow efficiency and damage ratioTime(hrs)Pwf(psi)Time(hrs)Pwf(psi)
0 4412 4.82 3616
0.12 4272 5.78 3607
0.24201 6.94 3600
0.34122 8.32 3593
0.44057 14.4 3573
0.53995 17.3 3567
0.63953 20.7 3561
0.73912 24.9 3555
0.83884 29.8 3549
0.93857 35.8 3544
1 3822 43 3537
1.94 3699 51.5 3532
2.79 3653 61.8 3526
4.01 3636 74.2 3521
By Eng.MAbbas

5. By Eng.MAbbas

6. By Eng.MAbbas

7. 3-Pressure drop due to skin factor:
4-
Damage ratio is estimated as
2.3
= 1-
386.9
891
=0.43=43%
By Eng.MAbbas

8. EXAMPLE 2: VARIABLE-RATE TESTING WITH
SMOOTHLY CHANGING RATES
By Eng.MAbbas

9. By Eng.MAbbas

10. By Eng.MAbbas

11. By Eng.MAbbas

12. Any Questions??????????
By Eng.MAbbas