Well depth: 10,657 ft TVD RKB
12,000 ft MD
Air gap: 60 ft
Water depth: 2150 ft
Sea water gradient: .445 psi/ft
Mud weight: 13.3 ppg
37. What mud weight increase is required to balance the well if the riser is to be removed?
a. 2.4 ppg b. 5.1 ppg c. 1.3 ppg d. 13.3 ppg
38. A BOP drill was conducted and the well shut in on the upper annular preventer. If the choke line is filled with sea water and the fail safe valves are opened, what would be the the casing pressure read?
a. 545 psi b. 945 psi c. 60 psi d. 245 psi
39. if the riser is lost in bad weather, what would be the bottom hole pressure reduce by?
a. 350 psi b. 500 psi c. 480 psi d. 571 psi
40. If the riser had a collapse pressure of 500 psi, how far could the mud level fall before seawater collapses the riser?
a. 1083 ft b. 1183 ft c. 1283 ft d. 1383 ft
Air gap
41. If a function is made to close the hang off rams and your fluid counter continues to register fluid movement after the correct closing volume has gone passed, what would you consider doing? (1 answer)
a. Call the subsea engineer and let him sort it out b. Close another set of rams
c. Put the operating unit into block position d. Everything is OK, continue
42. To find ICP, you must add the choke line friction to the slow circulating rate: a. True
b. False
43. The hydraulic fluid system used to operate the subsea BOP‟s consist of potable water and additives.
a. True b. False
44. The rig has an air gap of 80 ft. If the riser has a collapse pressure of 450 psi, how far would the mud level fall before it collapse if you are working in 1600 ft of .445 psi/ft of sea water?
a. 1091 psi b. 1191 psi c. 1291 psi d. 1391 psi
45. Using the following data, calculate the expanded gas volume that would be at surface if 2 barrels of gas had remained trapped under the rams and was released into the riser when the well was opened back up after a successful operation?
Well data:
Choke line length: 1500 ft
Riser length: 1480 ft
Kill mud weight: 12.5 ppg
Drilling mud: 11.2 ppg
Atmospheric pressure: 14.7 psi
a. 113 bbls b. 123 bbls c. 133 bbls d. 143 bbls
46. Calculate the usable fluid in a 10 gallons bottle if the maximum pressure is 3000 psi, the mimimum is 1500 psi and the pre charge is 1000 psi?
a. 5.00 gals b. 3.34 gals c. 6.63 gals d. 1.73 gals
47. If accumulator bottles were taken to the seabed with the same precharge as surface bottles, what effect would this have on the usable fluid?
a. Increase b. Decrease
EXERCISE # 10
1. When using the choke to adjust pressure it is the Casing (Annulus) gauge that reacts to the adjustment before the Drill Pipe Gauge.
a) True b) False
2. The choke is used to adjust Casing (Annulus) pressure, but to adjust the Drill Pipe pressure you have to change the pump rate.
a) True b) False
3. The Casing (Annulus) gauge is always slower to react to any choke adjustment then the Drill Pipe Pressure.
a) True b) False
4. The wait and weight method will always result in lower casing shoe pressures. a) True
b) False
5. The wait and weight will result in lower casing shoe pressure if the open hole volume is less than the drill pipe capacity.
a) True b) False
6. The Driller‟s method of well control will result in higher casing shoe pressures if the open
hole volume is less than the drill pipe capacity. a) True
b) False
7. The Driller‟s method of well control will result in the same pressure on the casing shoe if
the open hole volume is less than the drill pipe capacity. a) True
8. Place the following statements in the correct order if you are using the Driller‟s Method. The well is already shut in.
NOTE : There are 3 INCORRECT statements in the list.
a) Bring pump up to kill speed holding casing pressure constant. b) Maintain casing pressure constant until kill mud is at the bit. c) Maintain pumping pressure constant until influx is out.
d) Maintain drill pipe pressure constant until kill mud reaches surface.
e) Shut-in the well and check both SICP and SIDPP are approximately equal. f) Bring pump up to kill speed holding casing pressure constant.
g) Line up suction to kill mud.
h) Maintain casing pressure constant until kill mud is pumped to surface. i) Maintain casing pressure constant for complete circulation.
j) Bring pump up to kill speed holding drill pipe pressure constant. k) Shut in well and check for zero shut in pressure.
Place your answers in order below :
1st __________ 2nd ____________
3rd __________ 4th ____________
5th __________ 6th ____________
9. Place the following statements in the correct order if you are using the Wait and Weight to kill a well. The well is already shut in.
NOTE : There are 3 INCORRECT statements in the list.
a) Bring pump up to speed holding drill pipe pressure constant.
b) Allow drill pipe pressure to fall from ICP to FCP as kill mud is pumped to bit. c) Bring pump up to speed holding casing pressure constant
d) Maintain drill pipe pressure constant as kill mud pumped from bit to surface. e) Allow drill pipe pressure to fall gradually from ICP TO FCP as kill mud is pumped
from suction pit to shaker.
f) Shut down and check the well is dead.
1rst ________
2nd _________
3rd _________
4th _________
10. Which of the following statements are True or False concerning the Wait and Weight method?
a. In the Wait and Weight method the casing pressure should be kept constant during 2nd
circulation. a) True b) False
b. In the Wait and Weight method , annulus pressures are kept lower than with the Driller‟s method.
a) True b) False
c. In the Wait and Weight method there are less calculations compared to the Driller‟s
method. a) True b) False
d. Only the Wait and Weight method the drill pipe pressure is held constant throughout. a) True
b) False
e. In the Wait and Weight method the drill pipe pressure is held constant throughout. a) True
b) False
f. In the Wait and Weight method the well is dead when you reach FCP. a) True
b) False
g. In the Wait and Weight method the drill pipe pressure should read zero, after surface to bit strokes have been pumped if you shut in the well.
a) True b) False
h. The wait and weight method must be used if insufficient barite is on board. a) True
b) False
i. The Wait and Weight method does not require you draw a graph or step down chart. a) True
b) False
j. The Wait and Weight is the preferred method if MAASP is critical and the open hole capacity is greater the drill string capacity.
a) True b) False
11. Based on the following information :
a. Will the Wait and Weight method give lower shoe pressures than the Driller‟s
method?
TVD = 10,000 ft
Shoe Depth = 8,830 ft
Surface to Bit Strokes = 1,629 stks
Bit to Shoe strokes = 1,304 stks
Bit to surface = 6,480 stks SIDPP = 500 psi SICP = 800 psi Present Mud Wt. = 10.3 ppg Kill Mud Wt. = 11.3 ppg MAASP = 1,300 psi Pit Gain = 30 bbls Answer – Yes or No
b. Based upon same information above :
Will the Wait and Weight Method give lower surface pressures than the Driller‟s Method? Answer – Yes or No
12. Company policy states “when killing a well you will always attempt to kill the well using a
method that minimizes the pressure on the stack and upper casing”. Which method would you choose?
DRILLERS OR WAIT AND WEIGHT
13. Link the following by matching up the correct number to the correct letter. 1. One circulation lower annulus pressures.
2. Less calculations highest annulus pressures. 3. Most calculations moderate annulus pressures. A. Driller Method
B. Concurrent Method C. Wait and Weight method
14. Which of the following statements are true ?
a. Surface line volume will affect the point at which kill mud will increase mud hydrostatic on bottom.
b. Pump must be brought up to speed holding casing pressure constant
c. Surface line volume does not need to be considered when starting to kill a well d. Maintain the drill pipe pressure constant when starting up the pump to kill speed.
TRUE STATEMENTS ARE____________________and ___________________________
15. Select one of the following statements that is TRUE concerning wellbore pressures when circulating a gas influx to surface. (Drillers Method)
a. So long as the correct kill procedures are followed that part of the wellbore which is above a gas influx will have a constant pressure.
b. So long as the correct kill procedures are followed that part of the wellbore which is below a gas influx will have a constant pressure.
c. So long as the correct kill procedures are followed that part of the wellbore which is below a gas influx will have an increasing pressure.
16. From the statements A to F below, place 3 of them correctly in the blanks provided :
A - Drillers
B - Bring pump up to speed holding drill pipe pressure constant
C - Constant bottom hole pressure
D - Concurrent
E - Bring the pump up to speed holding the casing pressure constant
F - Drill pipe pressure constant
The main principle of well killing methods is to maintain _____________________
The most common methods are the Wait and Weight and ____________________ method
17. Which one of the following statements is true concerning wellbore pressure during the 1st circulation of the Driller‟s method?
a. Pressure at any point above a gas influx is constant. b. Pressure at any point above a gas influx is decreasing. c. Pressure at any point above a gas influx is rising. d. Pressure at any point below a gas influx is decreasing. e. Pressure within a gas bubble remains constant.
18. A gas is being circulated up the hole during a kill operation what effect will this have on the pressures at the various locations listed.
EFFECT IN PRESSURE
LOCATIONS Increase Decrease Stays the
same Increase at first Then remains constant Gas Bubble Surface Casing Gauge Casing shoe Bottom Hole At any point below gas bubble At any point above Gas bubble
19. While killing the well on the 1st Circulation of the Driller‟s method, the drill pipe pressure is 1,200 psi at 30 spm. Casing pressure is 1,000 psi. Very quickly the drill pressure increases to 1,500 psi but no change in casing pressures. Pump rate still holds at 30.
You decide to open the choke to bring the drill pipe pressure back to 1,200 psi with 30 spm.
What has happened to bottom hole pressure ?
a. Increase b. Decrease
c. Stay in the same.
20. In the previous example you decided to stop the pump and close the choke before making a decision. You think that the nozzles may be blocking. What would you do?
a. Start pump up to 30 spm and manipulate choke to get 1,200 psi on drill pipe.
b. Start pump up to 30 spm holding the choke pressure constant. Once pump is up to
speed note the drill pipe pressure and hold that constant for rest of 1st circulation.
c. Increase mud weight by an amount equal to 300 psi.
d. By using the spm versus pump pressure equation the spm for 1,500 psi would be 34 spm. Therefore you bring pump up to 34 spm and adjust choke to obtain 1,500 psi drill pipe pressure.
21. During the second circulation of the Driller‟s method you hold drill pipe pressure constant
until kill mud is at the bit. What would happen to bottom hole pressure ? a. Increase
b. Decrease c. Stay the same
22. During the first circulation of the Driller‟s method you decided to hold casing pressure
constant. What would happen to bottom hole pressure ? a. Increase
b. Decrease c. Stay the same
23. During the second circulation of the Driller‟s method you decide to hold casing pressure
constant until kill mud is at the bit. What would happen to bottom hole pressure ? a. Increase
b. Decrease c. Stay the same
24. Below is a list of problems. Match the cause to the problem.
PROBLEM CAUSE
a. Both gauges falling 1. Choke plugging
b. Both gauges rising 2. Bit plugging
c. D.P. gauges rising 3. Choke washout
d. D.P. gauge falling 4. Nozzle / pipe washout
a. matches _____________________________ b. matches _____________________________ c. matches _____________________________ d. matches _____________________________
25. Which of the following pressures do not increase with gas migration ? a. Bottom hole pressure
b. Casing shoe pressure c. Shut in casing pressure d. Gas bubble pressure
25. The following graphical diagrams show the approximate changes in pressure at certain points in the well during the Wait and Weight method.
a. Surface casing pressure b. Casing shoe pressure c. Bottom hole pressure d. Drill pipe pressure
NOTE / Pressure reading are not drawn to scale.
Answer:
Answer: