Well Control Quiz

Tutorial prepared by Eltun Talibov, Drilling Engineer at State Oil Company of AZERBAIJAN REPUBLIC (SOCAR), Email:Eltun-talibov98@mail.ru

Problem №1
1) TVD=9500 ft
2) Mud weight=10 ppg
3) Shut in Drill Pipe Pressure(SIDPP)=400 psi
4) Height of influx=700 ft
5) Influx gradient=0.1 psi/ft

Calculate the Shut in Casing Pressure(SICP)

a)710 psi
b)70 psi
c)650 psi
d)694 psi

Problem №2
A well is shut in with the following data:
SICP=0 psi
SIDPP=200 psi

There is no flow from the annulus when the choke is opened. What is the most likely cause of zero SICP?


Problem №3
A 20 bbl heavy slug with a weight of 13 ppg is pumped before pulling out of hole(POOH).TVD=9700 feet.The level in the pipe falls by 180 ft.What is the change in bottom hole pressure if the original mud weight was 12 ppg?

a)950 psi
b)163 psi
c)0 psi
d)520 psi

Problem №4
Whilst drilling ahead, the well kicks and is shut in. Drill pipe pressure and casing pressure both start to build up, but before stabilizing both start to drop quite rapidly. Which of the following might have occurred?

a)Both gauges have malfunctioned
b)A weak formation has broken down
c)Gas is migrating up the bore
d)The BHA has packed off
e)The drill string has washed out

Problem №5
String weight change(increase) can be possible indicator of what?

Problem №6
Shut in Casing Pressure is usually higher than Shut in Drill Pipe Pressure. If there was a large amount of cuttings in the annulus how would this effect pressure readings?

a) SICP would be higher than expected
b) SICP would be lower than expected
c) It would not affect pressure readings

Problem №7
Which of the following are affected by formation permeability? (pick 3 answers)

a) ICP
b) Kill weight mud
c) Influx volume
e) Time for pressures to stabilize

Problem №8
Select the good operating practices from the list while drilling top hole formations (4 answers):

a) Control drilling rate to avoid overloading the annulus with cuttings
b) Maintain as high overbalance as possible
c) Continue to circulate when picking up for connection
d) Circulate at maximum rate to create highest possible ECD
e) Drill a pilot hole
f) Maintain mud density as low as possible

Problem №9
A well was shut in and the following readings were recorded:

Time (hour)                SIDPP (psi)                 SICP (psi)

10:00                               250                             310
10:05                               300                             370
10:10                               350                             430
10:15                               390                             480
10:20                               420                             510
10:25                               430                             520
10:30                               440                             530

What is the value of SIDPP?

Problem №10
A vertical well is 5520 ft deep and filled with 11.2 ppg mud. While circulating at 100 spm the friction losses are in the well system as follows:

-150 psi through surface equipment
-900 psi through drill string
-1700 psi through bit nozzles
-100 psi through annulus

What is the pump pressure when circulating at 100 spm?

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