NV C-23 DRILLING WELLS FINAL PAPER 2026
EXAM STUDY SHEET WITH VERIFIED CORRECT
ANSWERS
◉ Do vertical or horizontal wells produce at higher rates and
produce more oil and gas? Answer: horizontal wells
◉ What is the most important reason for drilling horizontal wells?
Answer: The increase in return on investment (ROI).
◉ What other reasons for horizontal drilling Answer: More oil is
recovered by horizontal wells compared to vertical wells with the
same reservoir parameters and under the same flow conditions.
Production rates and volumes must justify the drilling and
completion of a horizontal well.
Cost of drilling a horizontal well is more than that of a vertical well,
and completion costs are also usually higher.
◉ A horizontal well is classified based on what? Answer: Its turning
radius.
,◉ What is the turning radius? Answer: a radius that is required to
turn from the vertical to the horizontal direction.
◉ Is horizontal drilling new to the oil industry? Answer: No. In the
1920s the first horizontal well was drilled in Texas.
◉ 40 years ago who began to experiment with the technique?
Answer: Russians
◉ When was a significant number of short-length horizontal wells
(usually less than 30-m) were drilled. Answer: the 1940-50s
◉ When was Horizontal drilling technology was sufficiently
developed to allow the drilling of several horizontal wells in Canada.
Answer: the 1970s
◉ in what year was there more than 100 horizontal wells drilled?
Answer: In 1988
◉ Equivalent production from one horizontal well can require
almost ___ times as many conventional wells Answer: (3-6)
◉ High production rate is due to the greater productive formation
_____ exposed to the well bore. Answer: surface area
, ◉ Potential applications of horizontal drilling can be related to the
what? Answer: target location, reservoir characteristics, and the
nature and properties of formation fluids
◉ ____method is used in deep reservoirs and when an extended
reach from an existing surface location is required. Answer: Long
radius
◉ _____ method is used to develop reservoirs in shallow depth and
require accurate well placement. Answer: Medium Radius
◉ ______ method is used for re-completing wells (workover) and in
drilling through lower permeability, naturally fractured reservoirs.
Answer: Short radius
◉ What are the applications of horizontal drilling? Answer: -Gas and
water coning
-tight reservoirs
-fractured tight reservoirs
-naturally fractured reservoirs
-inaccessible reservoir
EXAM STUDY SHEET WITH VERIFIED CORRECT
ANSWERS
◉ Do vertical or horizontal wells produce at higher rates and
produce more oil and gas? Answer: horizontal wells
◉ What is the most important reason for drilling horizontal wells?
Answer: The increase in return on investment (ROI).
◉ What other reasons for horizontal drilling Answer: More oil is
recovered by horizontal wells compared to vertical wells with the
same reservoir parameters and under the same flow conditions.
Production rates and volumes must justify the drilling and
completion of a horizontal well.
Cost of drilling a horizontal well is more than that of a vertical well,
and completion costs are also usually higher.
◉ A horizontal well is classified based on what? Answer: Its turning
radius.
,◉ What is the turning radius? Answer: a radius that is required to
turn from the vertical to the horizontal direction.
◉ Is horizontal drilling new to the oil industry? Answer: No. In the
1920s the first horizontal well was drilled in Texas.
◉ 40 years ago who began to experiment with the technique?
Answer: Russians
◉ When was a significant number of short-length horizontal wells
(usually less than 30-m) were drilled. Answer: the 1940-50s
◉ When was Horizontal drilling technology was sufficiently
developed to allow the drilling of several horizontal wells in Canada.
Answer: the 1970s
◉ in what year was there more than 100 horizontal wells drilled?
Answer: In 1988
◉ Equivalent production from one horizontal well can require
almost ___ times as many conventional wells Answer: (3-6)
◉ High production rate is due to the greater productive formation
_____ exposed to the well bore. Answer: surface area
, ◉ Potential applications of horizontal drilling can be related to the
what? Answer: target location, reservoir characteristics, and the
nature and properties of formation fluids
◉ ____method is used in deep reservoirs and when an extended
reach from an existing surface location is required. Answer: Long
radius
◉ _____ method is used to develop reservoirs in shallow depth and
require accurate well placement. Answer: Medium Radius
◉ ______ method is used for re-completing wells (workover) and in
drilling through lower permeability, naturally fractured reservoirs.
Answer: Short radius
◉ What are the applications of horizontal drilling? Answer: -Gas and
water coning
-tight reservoirs
-fractured tight reservoirs
-naturally fractured reservoirs
-inaccessible reservoir
