Louisiana (LA) 7-136 Horizontal Directional Drilling
(HDD) State Contractor Licensing Practice Exam and
Technical Study Guide
Newest Exam 2026/2027 Questions With Verified
Answers Graded A+ | Instant Pdf Download
The Louisiana (LA) 7-136 Horizontal Directional Drilling exam is a closed-
book assessment consisting of multiple-choice questions. You are allotted four
hours to complete the exam, and a calculator is provided for use during the test.
Core Exam Domains
The exam covers technical, safety, and regulatory aspects of the HDD trade. Key areas of coverage
include:
Trenchless Technology Fundamentals: Understanding the three basic stages of HDD: pilot hole
drilling, pre-reaming (expanding the hole), and pullback of the production pipe.
Drilling Operations: Techniques for pilot hole steering, tool face orientation (controlling the direction of
the bit), and maintaining the prescribed radii and design constraints.
Soil Analysis & Drilling Fluids: Identifying soil types and managing drilling mud (bentonite mixtures) to
cool the bit, lubricate the drill string, and provide borehole stability.
Technical Calculations: Mathematical problems related to pullback tension, bore path geometry, and
drilling fluid volume requirements.
Safety & Hazard Management: Recognizing risks unique to HDD, such as inadvertent fluid returns (frac-
outs) and potential utility strikes/explosions.
, Equipment & Tools: Familiarity with drill rigs, jetting housings, locating beacons/sondes, and various drill
bits.
Louisiana State Regulations: Knowledge of licensing requirements (7-136 classification) and state-
specific safety or environmental laws.
1. What is the standard range for a drill rig's entry angle in most HDD operations?
A) 4° to 8°
B) 12° to 16°
C) 20° to 25°
D) 30° to 45°
Explanation: Most HDD rigs are designed for an entry angle between 12° and 16°,
which allows the drill string to reach the required depth while maintaining proper
steering control and reducing stress on the pipe.
2. Which of the following is a hazard considered unique to the HDD process?
A) High noise levels from machinery
B) Inadvertent fluid returns (frac-outs)
C) Basic electrical shocks from tools
D) Slips and falls on the site
Explanation: A unique risk of HDD is a "frac-out," where drilling fluid pressure exceeds
soil strength and forces fluid to the surface. Additionally, striking a gas line poses a high
explosion risk due to trapped gas and potential sparks.
3. In HDD, what is the primary role of "Bentonite" within the drilling fluid?
A) To harden the soil into concrete
B) To act as a fuel source for the bit
, C) To suspend cuttings and provide borehole stability
D) To increase the weight of the drill rig
Explanation: Bentonite is used to boost fluid viscosity, which helps lubricate the bit,
prevent borehole collapse, and carry excavated soil (cuttings) out of the hole.
4. The "tool face" orientation in directional drilling is used primarily to:
A) Measure the total depth of the well
B) Control the direction of the drill bit's path
C) Calculate remaining fuel levels
D) Determine soil moisture content
Explanation: The tool face refers to the orientation of the steering bias (bent sub). By
rotating the drill string to a specific "clock position," the operator steers the bit left, right,
up, or down.
5. What is the final technical stage of a typical HDD installation?
A) Pilot hole drilling
B) Pre-reaming
C) Pullback of the product pipe
D) Surface restoration
Explanation: The HDD process consists of three main stages: drilling a pilot hole,
reaming to enlarge the hole, and the final pullback of the actual utility or product pipe
through the tunnel.
6. What is the primary purpose of a "strike alert" system on an HDD rig?
A) To signal the end of a shift
B) To warn the operator if the drill string hits an energized electrical line
C) To measure the hardness of rock
, D) To track the location of the exit pit
Explanation: A strike alert system is a critical safety feature that monitors the electrical
potential of the rig and sounds an alarm if the equipment becomes energized by hitting
an underground power line.
7. Which system is most commonly used for locating the drill head in shallow
bores?
A) GPS Satellite tracking
B) Walk-over locating system
C) Ground-penetrating radar
D) Magnetic resonance imaging
Explanation: A walk-over system uses a handheld receiver on the surface to track a
transmitter (sonde) in the drill head, providing real-time depth, pitch, and roll data.
8. When planning a bore path, the "minimum allowable bend radius" is
determined by:
A) The color of the pipe
B) The total length of the bore
C) The physical properties and diameter of the product pipe
D) The weight of the drilling rig
Explanation: The bend radius is limited by the flexibility of the drill pipe and the product
pipe's material. Exceeding this can cause the pipe to kink, crack, or fail during
installation.
9. What does a "zero" tool face position typically indicate in standard
steering?
A) Steering to the left
B) Steering to the right
(HDD) State Contractor Licensing Practice Exam and
Technical Study Guide
Newest Exam 2026/2027 Questions With Verified
Answers Graded A+ | Instant Pdf Download
The Louisiana (LA) 7-136 Horizontal Directional Drilling exam is a closed-
book assessment consisting of multiple-choice questions. You are allotted four
hours to complete the exam, and a calculator is provided for use during the test.
Core Exam Domains
The exam covers technical, safety, and regulatory aspects of the HDD trade. Key areas of coverage
include:
Trenchless Technology Fundamentals: Understanding the three basic stages of HDD: pilot hole
drilling, pre-reaming (expanding the hole), and pullback of the production pipe.
Drilling Operations: Techniques for pilot hole steering, tool face orientation (controlling the direction of
the bit), and maintaining the prescribed radii and design constraints.
Soil Analysis & Drilling Fluids: Identifying soil types and managing drilling mud (bentonite mixtures) to
cool the bit, lubricate the drill string, and provide borehole stability.
Technical Calculations: Mathematical problems related to pullback tension, bore path geometry, and
drilling fluid volume requirements.
Safety & Hazard Management: Recognizing risks unique to HDD, such as inadvertent fluid returns (frac-
outs) and potential utility strikes/explosions.
, Equipment & Tools: Familiarity with drill rigs, jetting housings, locating beacons/sondes, and various drill
bits.
Louisiana State Regulations: Knowledge of licensing requirements (7-136 classification) and state-
specific safety or environmental laws.
1. What is the standard range for a drill rig's entry angle in most HDD operations?
A) 4° to 8°
B) 12° to 16°
C) 20° to 25°
D) 30° to 45°
Explanation: Most HDD rigs are designed for an entry angle between 12° and 16°,
which allows the drill string to reach the required depth while maintaining proper
steering control and reducing stress on the pipe.
2. Which of the following is a hazard considered unique to the HDD process?
A) High noise levels from machinery
B) Inadvertent fluid returns (frac-outs)
C) Basic electrical shocks from tools
D) Slips and falls on the site
Explanation: A unique risk of HDD is a "frac-out," where drilling fluid pressure exceeds
soil strength and forces fluid to the surface. Additionally, striking a gas line poses a high
explosion risk due to trapped gas and potential sparks.
3. In HDD, what is the primary role of "Bentonite" within the drilling fluid?
A) To harden the soil into concrete
B) To act as a fuel source for the bit
, C) To suspend cuttings and provide borehole stability
D) To increase the weight of the drill rig
Explanation: Bentonite is used to boost fluid viscosity, which helps lubricate the bit,
prevent borehole collapse, and carry excavated soil (cuttings) out of the hole.
4. The "tool face" orientation in directional drilling is used primarily to:
A) Measure the total depth of the well
B) Control the direction of the drill bit's path
C) Calculate remaining fuel levels
D) Determine soil moisture content
Explanation: The tool face refers to the orientation of the steering bias (bent sub). By
rotating the drill string to a specific "clock position," the operator steers the bit left, right,
up, or down.
5. What is the final technical stage of a typical HDD installation?
A) Pilot hole drilling
B) Pre-reaming
C) Pullback of the product pipe
D) Surface restoration
Explanation: The HDD process consists of three main stages: drilling a pilot hole,
reaming to enlarge the hole, and the final pullback of the actual utility or product pipe
through the tunnel.
6. What is the primary purpose of a "strike alert" system on an HDD rig?
A) To signal the end of a shift
B) To warn the operator if the drill string hits an energized electrical line
C) To measure the hardness of rock
, D) To track the location of the exit pit
Explanation: A strike alert system is a critical safety feature that monitors the electrical
potential of the rig and sounds an alarm if the equipment becomes energized by hitting
an underground power line.
7. Which system is most commonly used for locating the drill head in shallow
bores?
A) GPS Satellite tracking
B) Walk-over locating system
C) Ground-penetrating radar
D) Magnetic resonance imaging
Explanation: A walk-over system uses a handheld receiver on the surface to track a
transmitter (sonde) in the drill head, providing real-time depth, pitch, and roll data.
8. When planning a bore path, the "minimum allowable bend radius" is
determined by:
A) The color of the pipe
B) The total length of the bore
C) The physical properties and diameter of the product pipe
D) The weight of the drilling rig
Explanation: The bend radius is limited by the flexibility of the drill pipe and the product
pipe's material. Exceeding this can cause the pipe to kink, crack, or fail during
installation.
9. What does a "zero" tool face position typically indicate in standard
steering?
A) Steering to the left
B) Steering to the right
