Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Drilling Engineering > Unit 2 - Rig Components > Flashcards

Unit 2 - Rig Components Flashcards

1
Q

What are the six major sub-systems on a drilling rig?

A
  • power system - hoisting system - circulating system - rotary system - well control system - well monitoring system
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe the components of a rotary drilling rig

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How do rigs usually receive their electrical power?

A

There are diesel powered internal combustion engines that drive eletrical power generators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which components on the drilling rig need electrical power supply ?

A

drawworks, rotary table and mud pumps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What uses the most electrical power on the drilling rig ?

A

the drawworks and the mud pumps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the task of a hoisting system?

A

to raise and lower drillstring and casing in and out of well

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the drawworks?

A

A revolving drum around which the drilling line is spooled → controlled by the driller

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Describe the components of a hoisting system!

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How are crown block and travel block connected?

A

drilling line is threaded of sheaves at crown block and sheaves at travel block

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Why do you need the hook attached to the travelling block?

A

To acutally suspend the drillstring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How do you call the set of clamps, which are connected to the travelling block? and what is there task?

A

Called the elevators → used when drillstring/casing is put in hole or pulled out from it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

If one side of the drilling line is connected at the the drawworks, where is the other side connected ? and how do you call the other side?

A

It is connected at an anchor point and called the deadline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How do you call the part of the drilling line, that is spooled over the drawworks?

A

Fastline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How do you choose the correct tensile strength of the drilling line as well as the number of times, that it is reeved throught the travelling- and crown block?

A

It depends on the load, which also has to be supported by the hoisting system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How do you calculate the tensile load of the drilling line and deadline ?

A

Ff = W/ExN

Fd = W/N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why do you need to include an efficiency factor in the calculation of Ff ?

A

Pulley system has always inefficiency → level of inefficiency is function of number of lines → more lines , more inefficiency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Why do you only need to include the efficiency factor for the calculation of the fastline and not the deadline?

A

Because the load on the deadline is a static load and will not be a function of the inefficiency therefore

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What do you need to do if you want to increase the load that the hoisting system has to support ?

A

Either increase the number of lines reeved around the blocks or use a drilling line with a greater tensile strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Where will the drilling line experience its most severe wear?

A

At point, where the rope passes over the top of the crown block sheaves and the end of the drilling line, where it constantly is spooled over the draw works drum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

How do you maintain a drilling line?

A

Execute regular slip or slip and cut operations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is a slipping operation?

A
  1. travelling block lowered to rick floor
  2. unclamping of dead line anchor
  3. threading some of reverse line through sheaves of travelling- and crown block onto drawworks drum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the problem with the slipping operation?

A

Can only be done 2-3 times before the drawworks drum is full → then you have to do a slip and cut operation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is a slip- and cut operation?

A
  1. Lower travel block to drill floor
  2. dead line anchor is unclamped and line on drawworks is unwounded
  3. unwounded line is cut and thrown away
  4. Reverse line is threaded thorugh system onto drawworks drum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

When experiences the drilling line the greatest amount of work ?

A

During round trips

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What are criterias on how to select a suitable rig ?

A
  • it needs to match the strength and capacity of the hoisting gear
  • it needs to be able to withstand the climatic conditions
  • it needs to have enough mobility for its application
26
Q

What are the two main functions of drilling fluid?

A
  • clean hole of cuttings made by the drillbit
  • Apply hydrostatic pressure sufficient to prevent formation fluids from entering the borehole
27
Q

Circulating system (graphic)

A
28
Q

A drilling fluid consists of ?

A

water, clay, weighting material (Barite) and chemicals

29
Q

What happens to the mud when it comes up the annulus?

A

Goes through flowline → solid removal equipment to remove cuttings → recirculation

30
Q

What kind of mixing pumps are usually used for the mud?

A

Centrifugal pumps (high volume, low pressure)

31
Q

How many slush pumps do you have at least at a rig?

A

At least 2

32
Q

How would you connected 2 slush pumps in shallow depths?

A

Parallel to have high flow rates

33
Q

How would you connect 2 flush pumps in deeper depths?

A

In series → to have high pressure and lower pump rates

34
Q

What does it mean, when a pump is double acting?

A

Pump on the up-stroke and on the down stroke

(Duplex)

35
Q

What does it mean, when a pump is single acting?

A

They only pump on an up stroke (Triplex)

36
Q

What are the advantages of a triplex pump?

A
  • lighter
  • smoother discharge
  • lower maintenance costs
37
Q

Where is the discharge line of a mud pump connected to ?

A

to the standpipe

38
Q

How are the standpipe and swivel connected?

A

Via the kelly hose

39
Q

What are the advantages of using reciprocating positive displacement pumps?

A
  • can pump fluids with high solid content
  • wide range of pressures and flow rates
  • reliable
  • simple to operate, easy to maintain
40
Q

Pump flowrate and pressure depend on ?

A

the sleevesize (liner), which is inside the cylinders of pump

41
Q

The power consumption of a pumpe is a product of ?

A

Flow rate and the output pressure

42
Q

The overall efficiency of a mud pump is a product of ?

A

Mechanical efficiency (Em) and volumetric efficiency (Ev)

43
Q

What is one stroke?

A

One complete pump revolution?

44
Q

How much is the volume output of a duplex pump with a spm of 20?

A

80 cylinder volumes per minute

45
Q

Why is the discharge of a triplex pump smoother than the one of a duplex pump?

A

Because it is always an equal volume that is discharged

46
Q

How come that triplex pumps are usually used offshore?

A

They are usually lighter and more compact

47
Q

Can triplex pumps or duplex pumps deliver a highter pressure?

A

Triplex pumps, because they can use higher pump speeds

48
Q

What are the 3 functions of a swivel?

A
  • support the weight on drill string
  • allows string to rotate
  • allows mud to be pumped while string rotates
49
Q

What is the function of the kelly?

A
  • 40’ long joint
  • outer hexagonal cross sectioin
  • transmits rotation from rotary table to drillstring
50
Q

Parts of the rotary system?

A
51
Q

Function of kelly saver sub ?

A

prevent excessive wear of threads of kelly connection (due to make- up and breakout of kelly)

52
Q

What are the kelly cocks?

A

valves at both ends of kelly → prevent backflow from well

53
Q

What is the function of the master bushing?

A

to protect the roatry table on rig floor

54
Q

How is the torque from the rotary table transmitted to kelly ?

A

through the kelly bushing

55
Q

What are slips used for ?

A

to hold the top of the drillpipe when it is screwed or unscrewed

56
Q

What is a stand?

A

3 joints of drillpipe together

57
Q

What is a top drive?

A

A power swivel connected to travelling block - 1000 hp electric motor

58
Q

Advantages of a top drive system?

A
  • 90’ stands can be added to string → elimination of 2 connections → saves time → more efficiency
  • When tripping out of hole → power swivel can easily be stabbed into string → circulation + string rotation when pulling out of hole if necessary (stuck pipe)
  • when tripping into hole → power swivel can be connected to allow any bridges to be drilled out without having to pick up kelly
59
Q

Disadvantages of top drive system?

A
  • Increase in top side weight on rig
  • Electric and hydraulic control lines must run up inside the derrick
60
Q

What is the function of a well control system?

A

Prevent uncontrolled flow of formation fluids from wellbore

61
Q

Well control systems are designed to?

A
  • detect a kick
  • close-in the well at surface
  • remove formation fluid, which has flowed into well
  • make well safe
62
Q

Which parameters needs to driller to check to see if they change (well monitoring)?

A
  • WOB
  • RPM
  • pump rate
  • pump pressure
  • gas content of mud

Drilling Engineering (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions