Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
47 Cards in this Set
- Front
- Back
|
What is MWD?
|
System of surveying down hole conditions, inclination and direction as part of the control of directional drilling operations.
|
|
|
MWD operators use either EM (electro-magnetic), negative or positive pulse technology to transmit information to the surface for recording and analysing in real time.
True or False |
True
|
|
|
What is the primary responsibility of the MWD operator?
|
Provide timely, accurate down hole surveys.
|
|
|
What is the method used to determine the position of the wellbore?
|
Survey
|
|
|
The three most important parts of a survey are?
|
Inclination
Azimuth Measured depth |
|
|
The angle measured between the well bore and vertical is?
|
Inclination
|
|
|
The direction of the horizontal component of the well bore referenced to true north is?
|
Azimuth
|
|
|
The actual depth of a hole drilled as measured from surface to any point in the well or TD (pipe length) is?
|
Measured depth
|
|
|
Why do we survey?
|
Monitor well path while drilling.
Help directional drillers make drilling decisions. Ensure that the well bore doesn't intersect with another well. Determine bottom hole location of the well. Maintain regulatory requirements. Calculate TVD. |
|
|
What are the three qualifiers that indicate a survey is reliable?
|
Magnetic dip angle
total magnetic field total gravity field. |
|
|
The angle at which the Flux lines enter the earth at the drilling location is?
|
Magnetic dip angle
|
|
|
As you travel north the magnetic dip angle will?
|
increase
|
|
|
The dip angle is calculated using data from the?
|
accelerometer and magnetometer
|
|
|
As you travel south the magnetic dip angle will?
|
decrease
|
|
|
If you travel below the equator the dip angle will be?
|
negative
|
|
|
What is the intensity of the magnetic field vector at the drill site called?
|
Total Magnetic Field
|
|
|
The total magnetic field is calculated using?
|
magnetometer
|
|
|
What is the strength of the earth's gravity called?
|
Total Gravity Field
|
|
|
Total Gravity is calculated by using what?
|
accelerometer
|
|
|
What is the tolerance of the magnetic dip angle?
|
.6 degrees + or -
|
|
|
What is the tolerance of magnetic field strength?
|
.005 Gauss + or -
|
|
|
What is the tolerance of total gravity field?
|
.006 G's + or -
|
|
|
General rules for surveying
|
Never make up a survey
Inclination and azimuth must come from the same survey. Interpolation and extrapolation must be noted. Use all available information to make a judgement call, whether or not a survey is correct or not. |
|
|
What is the difference between true north and magnetic north called?
|
Magnetic declination
|
|
|
East declination is ____?
|
positive
|
|
|
West declination is ____?
|
negative
|
|
|
How do you avoid drill string interference?
|
Ensure proper non magnetic spacing.
Properly Gauss all components before picking up tools with a Gauss meter. |
|
|
When would you use a magnetic toolface?
|
when inclination is less than 5 degrees.
azimuth heading will be the high side. |
|
|
When would the gravity toolface be used?
|
Inclination is above 5 degrees.
0 degrees will be the high side. |
|
|
What is used to measure the strength or direction of a magnetic field?
|
magnetometer
|
|
|
What unit of measure is used for the strength of a magnetic field?
|
Tesla
|
|
|
What device measures the physical acceleration force experienced by an object in a particular direction?
|
accelerometer
g-force (G's) |
|
|
Azimuth is calculated using?
|
accelerometer and magnetometer
|
|
|
Magnetic dip angle is calculated using?
|
accelerometer and magnetometer
|
|
|
Total Gravity is calculated by ?
|
accelerometer
|
|
|
Gravity tool faces are calculated by?
|
accelerometer
|
|
|
Inclination is calculated using?
|
accelerometer
|
|
|
Total Magnetic field is calculated using?
|
magnetometer
|
|
|
Magnetic tool faces are calculated using ?
|
magnetometer
|
|
|
What are the three most common elements that emit gamma rays?
|
Potassium
Uranium Thorium |
|
|
Which detector does Phoenix use for all its gamma probes?
|
scintillation
|
|
|
What is likely the cause of '255' failure mode?
|
Bad internal ground causing noise on pulse line.
Counter or amplifier failure. |
|
|
What is most likely the cause of a '0' failure mode?
|
Broken crystal
Bad connection between crystal and PMT Faulty photo multiplier tube Faulty HV power supply |
|
|
What are some common environmental factors that can influence the gamma readings?
|
Drill collar thickness (ID/OD)
Hole size Mud density Mud composition (KAL - potassium chloride) |
|
|
What is vertical section direction?
|
Direction to the drill from the well.
|
|
|
What is vertical section?
|
Distance drilled from vertical only.
|
|
|
Why are there two tool faces?
|
The high side can not accurately be defined at low inclination.
|
