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Well Control > General > Flashcards

General Flashcards

1
Q

When killing a well using drillers method what should happen to mud pit volume during second circulation

A

The volume should not change

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2
Q

Most kicks are caused by drill crew not

A

Ensuring the hole takes the correct fill on trips

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3
Q

Which part of pressure loss acts on bhp

A

Annular pressure loss

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4
Q

What 2 variables are considered for calculating hydrostatic pressure

A

Column length and density

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5
Q 
It's good practice to keep
Trip records
Pump output figures
Scr
Training records
All the above
A

All the above

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6
Q 
Scr should be taken every tour using
Sidpp on choke manifold
Drill pipe gauge on drillers console
Gauge on choke manifold
Pump gauge
Mud loggers
A

Dp gauge on choke panel

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7
Q

Hydrostatic pressure is the pressure exerted by a column of fluid at rest
True false

A

True

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8
Q 
Which method of well control has only one circulation and pumps kill mud from the start
Driller
W & w
Volumetric
Bull heading
A

w & w

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9
Q

Which method circulates the influx out of the well before kill mud is circulated round the system

A

Drillers

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10
Q

Which method of well control would you use if you you could not pump and gas migration was suspected

A

Volumetric

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11
Q

Primary prevention of blow outs is

A

Correct mud weight

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12
Q

Secondary method of well control is

A

Closing bop

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13
Q

As gas migrates up the well bore during shut in conditions

Eat pressure will increase

A

All pressures increase apart from the bubble pressure which will remain the same
I
S
I

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14
Q

If proper dp pressure is not maintained during a kill operation then Bhp will crease or decrease causing losses or another influx
True false

A

True

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15
Q

The u tube is balanced when the well is shut in regardless of the difference between sidpp and sicp

A

True

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16
Q

A large pit gain will give higher sidpp & sicp

A

The bigger the pit gain the higher the sicp

Sidpp is not effected

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17
Q

A long volume of kick will result in a higher or lower annulus pressure

A

Higher

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18
Q

Why is the sicp higher than the sidpp

A

Influx is less dense there fore the pressure is higher

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19
Q

After circulating out the influx using the drillers method should the sidpp and sicp bet he same

A

Yes

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20
Q

If the pump was brought up to kill speed and the casing pressure was allowed to increase above sicp
What would happen

A

Bhp would increase

Sicp should be kept constant whilst bring the pumps up to speed

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21
Q

A larger pit gain will give higher SIDPP & SICP.

A

False

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22
Q

When killing a well using the Drillers Method what should happen to the mud pit

A

The volume will not change

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23
Q

A larger pit gain will give higher SIDPP & SICP.

A

False

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24
Q

Circulating pressure of several thousand psi at the pump leaves the circulating system i.e. at the shakers, with little or no pressure. Which part of the pressure lost acts on the bottom of the hole?

A

Annular pressure loss

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25
Q

When killing a well using the Drillers Method what should happen to the mud pit volume during the second circulation?

A

The volume will not change

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26
Q

Which of the following is the first reliable indication that the well is kicking?

A

Increase in flow rate

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27
Q

If the mud volume displaced is not equal to pipe displacement, what should you do prior to flow checking the well?

A

Stop tripping & install a full opening safety valve

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28
Q

During drilling operations your derrickman informs you of an unusual pit level increase.What is the safest response

A

Pull up, shut off pumps & check for flow

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29
Q

Which of the following best describes the Hard Shut In?

A

With the R/C closed; close a BOP; open a side outlet

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30
Q

Which of the following best describes the Soft Shut In?

A

With the R/C open; open a side outlet; close the BOP; close the R/C

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31
Q

What should the driller do when he experiences a drilling break?

A

Flow check

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32
Q

The purpose of shutting in a well is to:

A

Stop further influx coming into the wellbore

AND Allow pressures to be determined

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33
Q

If total losses occurred while drilling with water based mud what would you do?

A

Stop drilling & fill the hole with water

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34
Q

Which of the following causes of well kicks is totally avoidable and due to lack

A

Not filling the hole with the right amount of mud

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35
Q

What do you do if the hole stays full but does not take the correct amount

A

Go back to bottom; circulate bottoms up

36
Q

If the well does not flow while circulating but flows when the pumps are shut down

A

An amount equal to pressure loss in the annulus

37
Q

If connection gas is noticed while drilling a reservoir what would be considered to be a good drilling practice if an increase in mud weight is not an option at this time?

A

Control drilling rate to ensure only one slug of gas in annulus at any one time AND Try & minimise connection time

38
Q

When the pipe is off bottom and the well kicks the recommended practice is to:

A

Install safety valve; secure well & strip to bottom

39
Q

Which of the following can cause a well to kick?

A 
All of these can
Lost circulation
Swabbing
Not keeping the hole full
Insufficient mud weight
40
Q

Why should the well be closed in quickly after a kick has been detected?

A

Minimise the influx into the wellbore

Pressures will be lower on the annulus side

41
Q

When encountering gas cut mud we should immediately increase the mud weight

A

You may have to increase the mud weight but first of all you should determine whether or not this will be possible without causing losses.

42
Q

What is SIDPP with the bit on bottom used to calculate?

A

Mud weight increase needed to kill the well
What type of influx has entered the wellbore
What is SIDPP with the bit on bottom used to calculate?

43
Q

After shutting in on a kick the SIDPP & SICP have been stable for a while.
Both have now started to slowly increase by the same amount.
What is the probable cause?

A

The influx is migrating up the wellbore

44
Q

A larger pit gain will give a higher SIDPP?

A

False

45
Q

A larger pit gain will give a higher SICP but SIDPP will remain the same regardless of kick size.

A

True

46
Q

The main reason for calculating the influx gradient is:

A

To make arrangements to handle the kick on surface

47
Q

If a gas kick is taken in a horizontal well what would you expect SICP to read?
A: SICP would be a lot higher than SIDPP

B: SICP would be a lot lower than SIDPP

C: SICP would about the same as SIDPP

D: SICP would be the same as in a vertical well

E: You cannot read SICP in a horizontal well

A

SICP would about the same as SIDPP

48
Q

After a kick has been shut in and pressures have stabilised then
Formation Pressure = Mud Hydrostatic Pressure in the String + SIDPP.

A

True

49
Q

When should MAASP be re-calculated?
A: After every bit change

B: After every 1000 feet drilled

C: After every mud weight change

D: After a successful BOP test

E: After all of the above

A

After every mud weight change

50
Q

Surface line volume does not have to be taken into consideration when pumping
Kill Mud down the string.

A

False

51
Q

The Leak Off Test shows the amount of surface pressure added to the column of
mud hydrostatic to cause a formation break down.

A

True

52
Q

A Leak Off Test is used to determine the maximum mud weight or maximum
surface pressure before lost circulation is likely to occur at the shoe.

A

True

53
Q

In order to get accurate leak off test information you need:
A: Known shoe TVD

B: Known and consistent mud weight in the well

C: An accurate pressure gauge

D: All of the above

E: None of the above

A

D: All of the above

54
Q

When killing a well using the Wait & Weight Method what will happen to the pit volume
the moment gas starts to enter the choke? A: The pit volume will increase

B: The pit volume will decrease

C: The pit volume will stay the same from now on

D: The pit volume will fluctuate erratically

E: The pit volume should not be monitored during a kill

A

As gas is circulated out the well through the choke the pit level will fall.

55
Q

As gas is circulated up the annulus to surface what will happen to the pit volume?
A: The pit volume will increase

B: The pit volume will decrease

C: The pit volume will stay the same from now on

D: The pit volume will fluctuate erratically

E: The pit volume should not be monitored during a kill

A

A: The pit volume will increase

56
Q

The two common kill methods, Drillers and Wait & Weight, both have
one thing in common: A: Both kill the well in one circulation

B: Both have a minimum non-circulating time

C: Both minimise pressure at the casing shoe

D: Both keep bottom hole pressure constant

E: Both need two pumps on the hole

A

D: Both keep bottom hole pressure constant

57
Q

When circulating out a gas kick the greatest applied pressure to the casing shoe
happens when the gas bubble is: A: At surface

B: At the casing shoe

C: At the bottom

D: The pressure remains the same during the kill

A

B: At the casing shoe

58
Q

The most important reason we want to know where an influx is in the annulus is because:
A: Drill pipe pressure is adjusted according to bubble position

B: Casing pressure is adjusted according to bubble position

C: We need to maintain a constant drill pipe pressure

D: We want to know when the bubble is at the shoe

E: None of the above are correct

A

If you have not exceeded MAASP by the time the bubble enters the shoe
then you won’t for the remainder of the kill as long as you continue to do
things correctly.

It is, therefore, useful to know when the bubble is inside the shoe.

59
Q

Pump speed should vary during a kill operation to maintain constant BHP.

A

False

60
Q

How many circulations are there in the Drillers Method?
A: One

B: Two

C: Three

D: The Drillers Method does not involve circulation

A

B: Two

61
Q

How many circulations are there in the Wait & Weight Method?

A

one

62
Q

How do you bring a pump up to speed for a kill operation on a surface stack?
A: Open the choke to maintain drill pipe pressure constant until up to speed

B: Open the choke to maintain casing pressure constant until up to speed

C: Both A & B can be used for a start up

D: Neither A & B can be used for a start up

A

Casing pressure should always be held constant during the start up.

63
Q

Whilst circulating out a kick the mud pump fails.

What is the first thing you should do?
A: Fix the pump as soon as possible

B: Change over to the other pump

C: Shut the well in

D: Use the Volumetric Method

E: Make preparations to start bullheading

A

C: Shut the well in

64
Q

When making adjustments to the Remote Choke during a kill operation what responses
would you expect to see if the choke was closed slightly? A: Casing gauge decrease followed by Drillpipe gauge decrease

B: Drillpipe gauge increase followed by Casing gauge increase

C: Casing & Drillpipe gauges will drop together

D: Casing gauge increase followed by Drillpipe gauge increase

E: Casing & Drillpipe gauges will rise together

A

D: Casing gauge increase followed by Drillpipe gauge increase

65
Q

What pressure is kept constant while filling the annulus with Kill Mud?
A: Initial Circulating Pressure

B: SICP minus Choke Line Friction

C: Final Circulating Pressure

D: Original SICP

E: Original SIDPP

A

Drillpipe pressure should be held constant at FCP as Kill Mud
fills the annulus.

66
Q

On a surface stack rig how can you find ICP when a kick has occurred
and the slow circulating rate pressure loss is not known?
A: Bring the pump up to speed holding casing pressure constant

B: Bring the pump up to speed adding 200 psi to casing pressure for safety

C: Add 100 psi safety to drillpipe pressure & circulate the influx out

D: Bring the pump up tp speed holding drillpipe pressure constant

E: Circulate at desired SPM holding 200 psi safety on drillpipe

A

A: Bring the pump up to speed holding casing pressure constant

67
Q

FCP is reached when:
A: The influx has been removed from the well

B: Kill mud reaches the bit

C: Kill mud reaches the shoe

D: Kill mud returns at surface

E: The pit level has stopped fluctuating

A

FCP is reached when kill mud is at the bit.

68
Q

While circulating out a kick pump speed is increased while holding drillpipe
pressure constant.
What happened to BHP?
A: It increased

B: It stayed the same

C: It decreased

A

C: It decreased

69
Q

After the first circulation of the Drillers Method SIDPP & SICP should be:
A: Zero

B: SICP should be slightly higher than SIDPP

C: The same

D: SIDPP should be slightly higher than SICP

E: None of the above are correct

A

C: The same

70
Q

A gas kick is being circulated from a well at 30 SPM with 750 psi being held constant on the
drillpipe pressure gauge. The pump speed is increased to 40 SPM while continuing to
hold drillpipe pressure constant.

The bottom hole pressure will:
A: Decrease

B: Increase

C: Remain constant

D: Drop to zero

E: Insufficient data for the calculation

A

A: Decrease
If the pump speed is increased then drillpipe pressure should
also increase. You have not allowed it to increase therefore
you are holding it at a lower reading than it should be at.

The result is that BHP will fall.

In this example drillpipe pressure should rise to approximately 1333 psi.

71
Q

Which of the following methods will result in the lowest casing shoe pressures
if open hole volume is considerably larger than string volume?
A: Drillers

B: Wait & Weight

C: Concurrent

D: Volumetric

E: Company Man’s

A

Wait & Weight method.

72
Q

Which of the following kill methods would you use if you could not circulate
and you suspected gas migration was taking place? A: Drillers

B: Wait & Weight

C: Concurrent

D: Volumetric

E: Company Man’s

A

Volumetric.

73
Q

What happens to the pressure below a gas bubble as it is circulated from
the well during a kill operation? A: It remains constant

B: It decreases

C: It increases

D: It rises at first then remains constant

E: It falls at first then remains constant

A

All pressures below a gas bubble remain constant.

74
Q

What happens to casing shoe pressure as a gas bubble is circulated from a well
during a kill operation? A: It remains constant

B: It decreases

C: It increases

D: It rises at first then remains constant

E: It falls at first then remains constant

A

Casing shoe pressure will rise as the gas bubble travels towards it
and then remain constant once it has passed.

75
Q

What happens to the pressure inside a gas bubble as it is circulated from
a well during a kill operation? A: It remains constant

B: It decreases

C: It increases

D: It rises at first then remains constant

E: It falls at first then remains constant

A

As the gas bubble expands the pressure inside it falls.

76
Q

What happens to the pressure on the casing gauge as a gas bubble is circulated
from a well during a kill operation? A: It remains constant

B: It decreases

C: It increases

D: It rises at first then remains constant

E: It falls at first then remains constant

A

Casing pressure will rise as the gas bubble is circulated up to surface.

77
Q

What happens to bottom hole pressure as a gas bubble is circulated from a well
during a kill operation?
A: It remains constant

B: It decreases

C: It increases

D: It rises at first then remains constant

E: It falls at first then remains constant

A

BHP reamins constant through the kill operation.

78
Q

Why will a 20 bbl kick in a small annulus be more significant than a
20 bbl kick in a large annulus? A: The kill weight mud cannot be calculated as easily

B: The kicks are usually gas

C: The pipe may become stuck in the smaller annulus

D: It results in higher annulus pressures

E: It results in higher drillpipe pressure

A

The influx will be longer in a smaller annulus and this will lead to
higher pressures in the annulus.

79
Q

The reason SICP is usually higher than SIDPP is: A: The cuttings in the annulus are lighter than the mud weight

B: The influx fluid is usually less dense than the mud weight

C: The casing pressure depends on the rig type

D: The difference is in the type of gauges used

E: This is a red herring as SIDPP is usually higher than SICP

A

SICP is usually higher due to the lighter influx being in the annulus
and clean mud being in the drill string.

80
Q

After the first circulation of the Drillers Method the well is closed in. The following
pressures were recorded on the surface gauges:

SIDPP = 700 psi SICP = 700 psi

Is this the type of reading you would expect? A: Only if the influx is a fluid

B: Only if the influx is a gas

C: Yes

D: No

E: Never

A

After the first circulation of the Drillers Method you should have
removed the influx from the well. Once shut back in SIDPP and
SICP should be reading approximately the same.

81
Q

On a surface stack rig what would happen if when bringing the pump up to kill
rate speed you allowed the casing pressure to increase above SICP? A: BHP would increase

B: BHP would stay the same

C: BHP would decrease

D: It will be OK as drillpipe pressure will rise by the same amount

E: As long as SIDPP remains constant everything will be fine

A

Casing pressure should be held constant while brining the pump
up to kill rate speed. By allowing it to increase you will also
increase the pressure on the bottom of the hole.

82
Q

When a gas kick is circulated out through the choke the pit volume will: A: Increase

B: Decrease

C: Stay the same

A

Pit volume will decrease.

83
Q

During a kill operation the choke operator notice drillpipe pressure shoots up rapidly while
casing pressure remains pretty much constant. He decides to live with the new reading
on the drillpipe pressure gauge which is 400 psi higher than it had been.

What effect will this have on bottom hole pressure? A: Bottom hole pressure will increase

B: Bottom hole pressure will decrease

C: Bottom hole pressure will remain constant

D: There is not enough information to tell

A

The indications here are that a nozzle has plugged. The new pumping
pressure is correct for the new conditions.

By doing nothing bottom hole pressure will remain constant.

84
Q

During a kill operation the choke operator notices a sudden increase in casing pressure
followed by a comparable increase in drillpipe pressure. He decides to live with the new
reading on the drillpipe pressure gauge which is 200 psi higher than it had been

What has happened to bottom hole pressure?
A: Bottom hole pressure will increase

B: Bottom hole pressure will decrease

C: Bottom hole pressure will remain constant

D: There is not enough information to tell

A

The indications here are that the choke has plugged. Ideally you should
change chokes but if that is not possible then you should attempt to
maintain drillpipe pressure at it’s original value.

By doing nothing bottom hole pressure has increased.

85
Q

During a kill operation the choke operator finds he is continually closing the choke to
maintain drillpipe pressure as it should be. A short time later the derrickman calls to
say the rig pump has developed a serious leak and he has just noticed.

What effect has the continual closing of the choke had on bottom hole pressure? A: Bottom hole pressure will increase

B: Bottom hole pressure will decrease

C: Bottom hole pressure will remain constant

D: There is not enough information to tell

A

The serious leak the pump has developed means less mud is now
going down the hole - in effect you are pumping at a slower rate.

The slower you pump the lower your pumping pressure should be.

By maintaining the old higher pumping pressure the choke
operator has increased bottom hole pressure.

Well Control (1 decks)

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