4th Class_Horizontal drilling technology

Select a correct name of the part shown in the figure.

• Kick off point

• Horizontal section

• Vertical part

• End of curve

How many degrees or more the horizontal section has to be at an angle to the vertical section to be defined as a horizontal well?

• > 70º

• > 75º

• > 80º

• > 85º

Select all the correct advantage(s) of horizontal well compared with vertical well

• Decreasing the drainage area

• Improving productivity in shallow reservoir

• Escalating the gas/water coning problems

• The cost of horizontal drilling is cheaper than that of vertical drilling

• Improving productivity in fractured reservoirs by intersecting a numbers of vertical fractures

Select all the correct disadvantage(s) of horizontal wells.

• Low overall current commercial success rate.

• Only one zone at a time can be produced using a horizontal well.

• Hole cleaning and Frictional forces.

• More costly than vertical wells.

How much higher is the cost of horizontal drilling than that of the same length of vertical drilling?

• 1.5 to 2.5 times higher

• 2.5 to 3.5 times higher

• 3.5 to 4.5 times higher

• 4.5 to 5.5 times higher

How can the drill bit be rotated in the horizontal drilling?

• by the turn table

• by the electric motor

• by the downhole mud motor

• by the mental power of drilling engineers

How can the drilling direction be changed in the horizontal drilling?

• by using the psychokinesis

• by using the soft drilling pipes

• by using curved drilling pipes

• by installing the bent sub between the drilling pipe and downhole motor

How can the cutting force be supplied to the drill bit in the horizontal drilling?

• by injecting water at high pressure

• by using the principles of lever

• by using the heavy weight drill pipes

• by installing the springs in the drilling pipes