Drilling

The Pre-Assessment consists a number multiple choice questions (anywhere between 15 to 25) designed to test your knowledge of Drilling Operations course. The information that you need in

order to answer these questions may be found within this course.After you complete the course assignment, you'll take a Post-Assessment that will enable you to compare your "before" and "after" scores and see what you've learned.Please note that the score you get in the Pre-Assessment is NOT being used in calculating your final score for this course. The Pre-Assessment is designed as a warm-up exercise for the actual assignment. The Post-Assessment, which you take after completing the assignment, is the same as this Pre-Assessment; it is the Post-Assessment score that is used to calculate your final course score. If you score below 80 on the Post-Assessment when you take it first time, you will have a chance to take it again and improve your score. The improved score will then be used to calculate the final course score.

No. Question Choices

1 When would a welded blade stabilizer be most effective in the bottomhole assembly (BHA)?

(a)When drilling at a remote location where flexibility in the BHA design is of primary importance.

(b)When drilling in soft formations where BHA centralization is the main concern.

(c)When drilling directionally in hard and/or abrasive formations.

(d)Cannot determine.

2 What is the main reason for tapering the drill collar string in a large-diameter hole interval?

(a)Minimize rental costs for large drill collars.

(b)Minimize the annular pressure loss in the circulating system.

(c)Minimize the potential for stuck pipe.

(d)Minimize the potential for connection failures.

(e)Cannot determine.

3 A well has been drilled to a depth of 2,425 ft [739 m]. A string of 10 3/4-inch [273

(a) 24.30 ft [7.40 m]

(b) 27.68 ft [8.44 m]

mm] casing is to be set 2 ft [0.61 m] off bottom. The total length of casing to be run in the hole, according to the final pipe tally, is 2,423.00 ft [738.53 m]. The casing string will also include a float shoe (length = 1.70 ft [0.52 m] and float collar (length = 1.68 ft [0.51 m]).

Datum is measured from the Kelly Bushing, which is 26.8 ft [5.73 m] above the floor of the cellar. How much casing will need to be cut off in order for the top of the casing to be 2.5 ft [0.76 m] above the cellar floor?

(c) 29.30 ft [8.93 m]

(d) 31.30 ft [9.54 m]


4 A casing string has been run to 3250 ft [991 m] TVD, and is to be cemented to surface. Based on leakoff tests from offset wells, the estimated fracture gradient at the casing shoe is 0.72 psi/ft [16.3 kPa/m].The bottom 200 ft of the cement column will be cemented with an API Class G slurry (weight = 15.8 lb/gal [Sp Gr = 1.9]). What maximum density would you recommend for the lead slurry in order to bring the cement to surface?

(a) 12.6 lb/gal [Sp Gr = 1.51]

(b) 13.6 lb/gal [Sp Gr = 1.63]

(c) 14.2 lb/gal [Sp Gr = 1.70]

(d) 15.8 lb/gal [Sp Gr = 1.90]


5 A 10 3/4 inch [273 mm] casing string is to be cemented in a hole interval drilled with a 14 3/4 inch [374.65 mm] bit. The actual hole diameter, as determined from a caliper log, is approximately 15 1/4 inches [387 mm]. How much of an

(a) 10 percent

(b) 20 percent

(c) 30 percent


excess should you apply in determining the cement volume requirements?

6 Which of these cement additives would you use to accelerate setting time and increase early compressive strength?

(a)Calcium chloride

(b)Calcium lignosulfonate

(c)Bentonite

(d)Hematite


7 To promote safe operations, how should you define a reportable incident?

(a)Any unplanned event that results in injuries or harm to people, damage to equipment or material, loss of property or damage to the environment.

(b)Any unplanned event that has the potential to result in physical harm, damage or other measurable loss, even if actual loss does not occur.

(c) (a) is always reportable; (b) may be reportable, but it depends on the how close the loss comes to actually occurring.


8 What type of Personal Protective Equipment (PPE) is required as the safe minimum for working in toxic gas or oxygen-deficient environments?

(a)None

(b) Filter-type respirator

(c) Powered air purifying respirator

(d) Self-contained or supplied air breathing apparatus


9 At minimum, what type of eye protection should rig personnel wear as part of their regular PPE to protect against dust, flying particles or other airborne solids?

(a)None

(b) Safety glasses

(c)Goggles

(d) Full face shields


10 Procedures for pressure testing BOP equipment vary according to company, location, well classification

(a) isolated from the casing string by a test plug.

(b) tested together with the casing string.

and equipment type. In all cases, however, the BOP stack should be:

(c) tested after drilling out the casing shoe.

(d) tested with the fluid that is to be used in drilling the next hole interval.


11 At minimum, BOP equipment should be function tested:

(a) every tour.

(b) every trip.

(c) daily.

(d)weekly.

12 The Maximum Allowable Annular Surface Pressure (MAASP) is a critical parameter in planning well control operations. As determined from a leakoff test, the MAASP is equal to the ____________________ minus an applicable safety margin.

(a)Hydrostatic pressure of the mud column plus the recorded leakoff pressure.

(b)Hydrostatic pressure of the mud column minus the recorded leakoff pressure.

(c)Recorded leakoff pressure.

(d)Hydrostatic pressure of the mud column.


13 A leakoff test is performed below the shoe of a well's intermediate casing string, and the Maximum Allowable Annular Surface Pressure (MAASP) is determined. The mud density at the time of the test is 11.6 lb/gal [Sp Gr = 1.39]. If the mud weight is later increased to 12.4 lb/gal [Sp Gr = 1.49], what will happen to the MAASP?

(a)MAASP will increase.

(b)MAASP will decrease.

(c)MAASP will not change.


14 When drilling directionally with a positive displacement motor (PDM), the rotary speed is typically _______________ than what would be used in the same interval with a non-directional bottomhole assembly.

(a) higher

(b) lower

(c) the same as

15 The pressure drop across a bit (Pbit) may be determined from the following formula:Pbit=[(MW)(q2)]/[10858 Anozzles

2]where MW = Mud weight in lb/gal; q = circulation rate, gal/min; and Anozzles = total nozzle area in 32nds of an inch (in SI units, with Pbit expressed in kPa, the constant 10,858 becomes 2,000).What is the friction pressure loss in the surface equipment, drill string and annulus under the following conditions:

Pump discharge pressure = 3000 psi [20685 kPa]

Pump rate = 550 gal/min [2082 liter/min]

Mud weight = 13.2 lb/gal [Sp Gr = 1.58]

Bit nozzle diameter = Two 17/32nds and one blank [Two 13.5 mm and one blank]

(a) 1129 psi [7784 kPa]

(b) 1871 psi [12900 kPa]

(c) 2169 psi [14955 kPa]


16 In evaluating bit performance, which of these cost elements would you normally consider as variable?

(a)Bit cost

(b) (Rig Cost) x (Trip Time)

(c) (Rig Cost) x (Rotating Time)

(d)None of the above

17 As a bit run progresses, will the proportion of the overall cost per foot [meter] that is attributable tovariable costs increase, decrease or stay the same?

(a) Increase.

(b)Decrease.

(c) Stay the same.

(d)Depends on the depth of the well.

18 In analyzing the performance of a rolling cutter bit, you

(a)Continue drilling ahead until the cost per foot starts to increase.

determine that:

the weight-on-bit and rotary speed have been constant for the past several hours,

the rate of penetration has increased slightly, and the cost-per-foot is decreasing, and

the rotary torque has increased significantly during the past hour.

Based on this information, what action would you recommend?

(b)Continue drilling ahead until the bit torques up completely.

(c) Increase the rotary speed and decrease the weight-on-bit.

(d) Pull the bit before you lose a cone.


19 What is the maximum number of drill pipe stands that you can pull from a well before filling the hole, assuming that you do not want the hydrostatic pressure of the mud column to drop more than 50 psi [345 kPa] below its present value? The hole is currently full of 10.9 lb/gal mud [Sp Gr = 1.31]. The average length of a stand of drill pipe is 91.44 ft [27.87 m], and the drill pipe displacement is 0.00648 Bbl/ft [0.0034 m3/m]. The well has 9 5/8 inch [244.5 mm] casing set at 6300 ft (Capacity = 0.0744 Bbl/ft [0.039 m3/m]).

(a) 1 stand

(b) 3 stands

(c) 5 stands

(d) 10 stands

(e) 15 stands

(f)Cannot determine.

20 Immediately upon taking a kick, a well is shut in and the following information is recorded :

Shut-in drill pipe pressure (SIDPP): 870 psi [6000 kPa]

Shut-in casing pressure (SICP): 1090 psi [7515 kPa]

(a)Gas

(b)Oil

(c)Water


Mud weight = 12.2 lb/gal [Sp Gr = 1.46]

Pit volume increase = 22 Bbl [3.5 m3

The hole diameter is 9 7/8 inches [250.8 mm] , and the bottomhole assembly includes 620 ft [189 m] of 6.5-inch [165.1 mm] drill collars.Is the formation influx gas, oil or water?

21 The volume of mud that is required to circulate a kick to surface corresponds to which of these volumes?

(a)Drill string volume

(b)Annular volume

(c)Drill string + annular volume

(d)Depends on what kill method is being used


22 Assuming that a linear pressure profile applies, what would be the initial and final circulating pressures for a well that is shut in under the following conditions:

Pump pressure at reduced circulating rate = 620 psi [4275 kPa]

SIDPP = 550 psi [3792 kPa]

SICP = 760 psi [5240 kPa]

TVD = 9,800 ft [2987 kPa]

Initial mud weight = 11.0 lb/gal [Sp Gr = 1.32]

Final mud weight = density required to kill well.

(a) Initial circulating pressure = 620 psi [4275 kPa]; Final circulating pressure = 682 psi [4702 kPa].

(b) Initial circulating pressure = 1380 psi [9515 kPa]; Final circulating pressure = 620 psi [4275 kPa].

(c) Initial circulating pressure = 1170 psi [8067 kPa]; Final circulating pressure = 682 psi [4702 kPa].

(d) Initial circulating pressure = 1310 psi [9032 kPa]; Final circulating pressure = 1380 psi [9515 kPa].


23 What problem or condition is most likely to cause pipe to become stuck due to key seating?

(a)High mud overbalance

(b)Heaving shales

(c)High concentrations of lost circulation material

(d) Severe doglegs.


24 Which of these fishing tools or assemblies would definitely not be appropriate for engaging and recovering differentially stuck pipe?

(a)Overshot

(b) Taper tap or releasing spear

(c)Drillstem testing (DST) tool assembly

(d)Any of these tools could be used to recover differentially stuck pipe.


25 What precautions should be taken to prevent the fishing assembly itself from becoming stuck once a fish is engaged?

(a)Run a safety joint in the fishing string that can be backed off if necessary.

(b)Run one joint of low-grade drill pipe in the fishing string so that it can be parted if necessary.

(c)Make up one connection in the fishing string using below-normal torque, so that it can be backed off if necessary.


Please Check your answers thoroughly before you submit them.Your answers will be recorded in a database and cannot be changed.

Drilling

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