# Well Control - Basic Knowledge 1

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Welcome to Well Control - Basic Knowledge quiz 1
. This quiz contains 25 questions on Basic Well Control. Take your time answering as you only get one go at each question. To answer simply click on it. If you have answered correctly you will be told so and your score will be adjusted accordingly. If you have answered incorrectly you will get a brief explanation of how to tackle the question but will not get a second crack at it. Good Luck.

Questions and Answers
• 1.

### A mud weight of 8.9 ppg has a gradient of

• A.

.463 psi/ft

• B.

.833 psi/ft

• C.

.465 psi/ft

• D.

.433 psi/ft

• E.

.013 psi/ft

Correct Answer
A. .463 psi/ft
Explanation
psi/ft = ppg x .052

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• 2.

### A larger pit gain will give higher SIDPP & SICP

• A.

True

• B.

False

• C.

Sometimes

• D.

Not enough information to tell

Correct Answer
B. False
Explanation
The bigger the pit gain the higher SICP is likely to be. SIDPP is not affected by the size of the influx.

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• 3.

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

• A.

The volume will increase considerably

• B.

The volume will decrease considerably

• C.

The volume will not change

• D.

The volume will increase at first then fall away

• E.

The volume will decrease at first then build back up

Correct Answer
C. The volume will not change
Explanation
The pit volume should remain constant during the second circulation.

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• 4.

### Most kicks are caused by drill crews failing to

• A.

Properly install & test BOP equipment

• B.

Pump a slug prior to pulling out the hole

• C.

Keep the hole full of drilling mud

• D.

Ensure the hole takes the correct fill on trips

• E.

All the above are correct

Correct Answer
C. Keep the hole full of drilling mud
Explanation
We tend to keep the hole full these days - whether or not we put the correct amount in for the steel removed is another matter.

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• 5.

### 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.

Surface line pressure loss

• B.

Drill string pressure loss

• C.

Bit nozzle pressure loss

• D.

Annular pressure loss

• E.

All of the above

Correct Answer
D. Annular pressure loss
Explanation
APL acts on the bottom of the hole.

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• 6.

### What two variables are considered when calculating hydrostatic pressure?

• A.

Depth & shape of the hole

• B.

Volume & weight of the mud

• C.

APL & mud weight

• D.

Hole depth & viscosity of the drilling mud

• E.

Column length & density of the fluid

Correct Answer
E. Column length & density of the fluid
Explanation
Hydrostatic Pressure is affected by the length of the column of fluid and the weight of the column of fluid.

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• 7.

### It is a good drilling practice to keep:

• A.

Trip records

• B.

Pump output figures

• C.

Slow criculating rate pressure losses

• D.

Crews trained up & well control concious

• E.

All of the above

Correct Answer
E. All of the above
Explanation
Keeping trip records, pump output figures, slow circulating rate pressure losses, and having crews trained up and well control conscious are all good drilling practices. Trip records help in tracking the progress of the drilling operation and identifying any issues or trends. Pump output figures help in monitoring the efficiency of the drilling fluid circulation system. Slow circulating rate pressure losses help in detecting any potential wellbore problems. Having crews trained up and well control conscious ensures that the drilling operation is conducted safely and efficiently. Therefore, all of the above practices should be followed for effective drilling operations.

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• 8.

### Slow circulating rate pressure losses should be taken and recorded every tour using:

• A.

The drillpipe gauge on the remote choke panel

• B.

The drillpipe gauge on the driller's console

• C.

The gauge on the choke manifold

• D.

The pump gauge

• E.

The reading obtained from the mud loggers

Correct Answer
C. The gauge on the choke manifold
Explanation
You kill the well using the gauge on the remote choke panel so this is what you should use for recording slow circulating rate pressure losses.

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• 9.

### Hydrostatic pressure is the pressure exerted by a column of fluid at rest.

• A.

True

• B.

False

Correct Answer
A. True
Explanation
Hydrostatic pressure is the pressure exerted by a column of fluid at rest. This means that when a fluid is not in motion, the pressure it exerts is due to the weight of the fluid above it. This pressure is evenly distributed in all directions and increases with depth. Therefore, the given statement is true.

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• 10.

### One of the most important rules in well control is to:

• A.

Know how to get SIDPP with a float in the string

• B.

Shut the well in quickly with the least amount of gain

• C.

Circulate out a kick with constant drillpipe pressure & strokes

• D.

Hold approximately 200 psi back pressure on the choke

• E.

Have slow circulating rate pressure losses to hand at all times

Correct Answer
B. Shut the well in quickly with the least amount of gain
Explanation
The smaller the pit gain, the lower pressures are likely to be. The quicker you close it in the smaller the pit gain.

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• 11.

### Which method of well control has only one circulation and you pump kill mud weight right from the start.

• A.

Drillers

• B.

Wait & Weight

• C.

Volumetric

• D.

Company Man's

• E.

Bullheading

Correct Answer
B. Wait & Weight
Explanation
Wait & Weight is the method of well control that has only one circulation and allows for pumping kill mud weight right from the start. This method involves monitoring the wellbore pressure while circulating the drilling fluid, and making necessary adjustments to the mud weight as needed to maintain well control. By using this method, the drilling team can quickly respond to any pressure changes and prevent a blowout from occurring.

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• 12.

### With which method of well control do you circulate the influx out of the well before you circulate kill mud round the system?

• A.

Drillers

• B.

Wait & Weight

• C.

Volumetric

• D.

Company Man's

• E.

Bullheading

Correct Answer
A. Drillers
Explanation
The correct answer is Drillers. In the drilling process, the Drillers method of well control is used to circulate the influx out of the well before circulating kill mud round the system. This method involves maintaining a constant bottom hole pressure while circulating the influx out of the well. It allows for controlled and gradual removal of the influx, ensuring the safety and stability of the well.

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• 13.

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

• A.

Drillers

• B.

Wait & Weight

• C.

Volumetric

• D.

Company Man's

• E.

Bullheading

Correct Answer
C. Volumetric
Explanation
If pumping is not possible and gas migration is suspected, the best method of well control would be the volumetric method. This method involves monitoring the wellbore pressure and fluid levels to detect any changes or irregularities. By closely monitoring these parameters, any indications of gas migration can be identified and appropriate actions can be taken to control the well.

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• 14.

### The primary method for the prevention of blowouts is..

• A.

Highly trained drillers

• B.

Closing the BOP's

• C.

Correct mud weight in the hole

• D.

A good company man

• E.

A good leak off test

Correct Answer
C. Correct mud weight in the hole
Explanation
The correct mud weight in the hole is the primary method for preventing blowouts. Blowouts occur when the pressure from the formation exceeds the pressure exerted by the mud column in the wellbore. By maintaining the correct mud weight, the pressure in the wellbore can be balanced with the formation pressure, preventing blowouts. This is achieved by carefully monitoring and adjusting the density of the drilling mud to ensure it is sufficient to counteract the formation pressure.

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• 15.

### The secondary method of controlling a blowout if primary control has been lost would be..

• A.

Highly trained drillers

• B.

Closing the BOP's

• C.

Correct mud weight in the hole

• D.

A good company man

• E.

A good leak off test

Correct Answer
B. Closing the BOP's
Explanation
Closing the BOP's (Blowout Preventers) would be the secondary method of controlling a blowout if primary control has been lost. Blowout Preventers are designed to seal the wellbore and prevent the uncontrolled flow of fluids during drilling operations. If primary control measures fail, closing the BOP's can help regain control over the well by stopping the flow of fluids and preventing further escalation of the blowout situation.

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• 16.

### If the proper drillpipe pressure schedule is not followed during a kill operation then BHP could either be too high or too low causing another influx or losses.

• A.

True

• B.

False

• C.

Sometimes

• D.

Only in vertical wells

• E.

Only in horizontal wells

Correct Answer
A. True
Explanation
If the proper drillpipe pressure schedule is not followed during a kill operation, it can lead to an imbalance in bottomhole pressure (BHP). This imbalance can result in BHP being either too high or too low. If BHP is too high, it can cause another influx of fluids into the wellbore. On the other hand, if BHP is too low, it can cause losses of fluids from the wellbore. Therefore, not following the proper drillpipe pressure schedule during a kill operation can result in either influxes or losses, making the statement true.

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• 17.

### As gas migrates up a wellbore during shut in conditions then.. Note: there is no float in the drill string

• A.

Casing pressure will increase

• B.

Drillpipe pressure will increase

• C.

Bubble pressure will increase

Correct Answer(s)
A. Casing pressure will increase
B. Drillpipe pressure will increase
Explanation
All pressures in the wellbore will increase with gas migration with the exception of bubble pressure which will remain constant.

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• 18.

### The formation pressure at 7500 ft TVD is 3488 psi. What is the approximate formation gradient?

• A.

.349 psi/ft

• B.

.465 psi/ft

• C.

.521 psi/ft

• D.

.722 psi/ft

• E.

1.00 psi/ft

Correct Answer
B. .465 psi/ft
Explanation
psi/ft = pressure/feet

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• 19.

### A blowout can be described as..

• A.

A flow of fluid from the formation into the wellbore

• B.

An abnormally pressured formation

• C.

An uncontrolled flow of fluid from the wellbore at surface

• D.

A combination of hydrostatic pressure and formation pressure

• E.

An exhalation of cigarette smoke

Correct Answer
C. An uncontrolled flow of fluid from the wellbore at surface
Explanation
A blowout refers to an uncontrolled flow of fluid, such as oil or gas, from the wellbore to the surface. This can occur when the pressure in the wellbore exceeds the pressure that can be contained by the well's safety systems. It is a dangerous and potentially catastrophic event that can result in the release of large amounts of hydrocarbons, posing risks to personnel, equipment, and the environment.

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• 20.

### Which of the following are possible indicators of a kick?

• A.

Increase in flow

• B.

Drilling break

• C.

Increase in pit volume

• D.

Gas cut mud

• E.

All of the above

Correct Answer
E. All of the above
Explanation
All of the given options can be possible indicators of a kick. An increase in flow can occur when the formation fluids enter the wellbore, causing an increase in the overall fluid flow. A drilling break refers to a sudden decrease in drilling rate, which can indicate that the drill bit has encountered a formation with higher pressure. An increase in pit volume can occur when formation fluids enter the wellbore and displace the drilling mud, causing an increase in the volume of fluid in the mud pits. Gas cut mud refers to the presence of gas in the drilling mud, which can indicate that formation fluids, including gas, have entered the wellbore.

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• 21.

### The slow circulating rate pressure loss is the pressure required to circulate mud round the system at a selected speed.

• A.

True

• B.

False

• C.

Sometimes

• D.

Only in vertical wells

• E.

Only in horizontal wells

Correct Answer
A. True
Explanation
The statement is explaining what the slow circulating rate pressure loss is, which is the pressure needed to circulate mud at a chosen speed in the system. Therefore, the statement is true.

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• 22.

### When should slow circulating rate pressure losses be taken?

• A.

As soon as practical after coming on tour

• B.

When the mud weight changes

• C.

After drilling a large footage (up to 1000')

• D.

BHA or bit nozzle changes

• E.

All of the above

Correct Answer
E. All of the above
Explanation
Slow circulating rate pressure losses should be taken in all of the mentioned scenarios. These losses should be monitored and recorded as soon as practical after coming on tour, when there is a change in mud weight, after drilling a large footage, or when there are changes in the BHA or bit nozzle. By taking these measurements, the drilling team can assess the efficiency of the drilling process and make necessary adjustments to maintain the desired mud weight and optimize drilling operations.

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• 23.

### The U-Tube is balanced when the well is shut in and pressures have stabilized regardless of the difference between SIDPP & SICP.

• A.

True

• B.

False

• C.

Only in vertical wells

• D.

Only in horizontal wells

• E.

Only with surface stacks

Correct Answer
A. True
Explanation
The statement is true because the U-Tube is a tool used to measure the difference between the Shut-In Drill Pipe Pressure (SIDPP) and the Shut-In Casing Pressure (SICP). When the well is shut in and the pressures have stabilized, the U-Tube will be balanced, indicating that there is no difference between the SIDPP and SICP. This balance is independent of the difference between the two pressures, meaning that even if the pressures are not equal, the U-Tube will still be balanced.

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• 24.

### The choke is used to adjust casing pressure but to adjust drillpipe pressure you need to change the pump speed.

• A.

True

• B.

False

• C.

Only in vertical wells

• D.

Only in horizontal wells

• E.

Only with surface stacks

Correct Answer
B. False
Explanation
The main purpose of the choke is to control back pressure.

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• 25.

### Bottom hole pressure is not affected when you pump a slug?

• A.

True

• B.

False

• C.

Only in vertical wells

• D.

Only in horizontal wells

• E.

Only with surface stacks

Correct Answer
A. True
Explanation
When you pump a slug, the bottom hole pressure is not affected. A slug is a volume of fluid that is pumped into the wellbore to displace another fluid. The purpose of pumping a slug is to remove or separate different fluids in the wellbore, such as oil and water. While the slug may cause changes in the pressure at other points in the wellbore, it does not directly affect the bottom hole pressure. Therefore, the statement that bottom hole pressure is not affected when you pump a slug is true.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Apr 28, 2014
Quiz Created by
Totan

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