Louisiana (LA) 7-136 Horizontal Directional Drilling
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Coverage – Louisiana (LA) 7-136 Horizontal Directional Drilling Exam
The Louisiana (LA) 7-136 Horizontal Directional Drilling (HDD) exam tests knowledge
of:
HDD methods and bore planning
Soil conditions and geotechnical considerations
HDD equipment, tooling, and tracking systems
Drilling fluids and mud management
Reaming and pipe pullback procedures
Utility locating and damage prevention
OSHA safety standards and jobsite hazards
Environmental protection and frac-out response
Louisiana licensing rules and contractor compliance
The exam focuses on safe, accurate, and code-compliant trenchless installation of
underground utilities in accordance with Louisiana contractor regulations.
,1. What is the primary purpose of a pilot bore in HDD?
A. Install casing
B. Establish final bore diameter
C. Create the guided bore path
D. Pull back product pipe
Answer: C
The pilot bore establishes the precise underground path before reaming and pullback
operations begin.
2. Bentonite in drilling fluid primarily functions to:
A. Harden soil
B. Stabilize the borehole and suspend cuttings
C. Increase drilling speed
D. Reduce torque only
Answer: B
Bentonite forms a filter cake along the borehole wall, preventing collapse and carrying
cuttings to the surface.
3. A steering tool in HDD is used to:
A. Mix drilling mud
B. Monitor bore direction and pitch
C. Increase hydraulic pressure
D. Detect gas leaks
Answer: B
Steering tools provide real-time data on inclination and direction to maintain bore alignment.
4. The optimal entry angle for most HDD projects typically ranges between:
A. 2°–5°
B. 8°–20°
,C. 30°–45°
D. 50°–60°
Answer: B
Entry angles between 8° and 20° balance depth control and drill rod stress.
5. What is a “frac-out” during HDD operations?
A. Tool joint failure
B. Sudden loss of torque
C. Unintended drilling fluid release to the surface
D. Bore collapse
Answer: C
Frac-out occurs when drilling fluid escapes through soil fractures to the ground surface.
6. Which soil type presents the greatest risk of bore collapse?
A. Solid rock
B. Loose sandy soil
C. Clay
D. Shale
Answer: B
Loose sand lacks cohesion and may collapse without proper fluid support.
7. The reaming process in HDD is performed to:
A. Change bore direction
B. Enlarge the pilot bore to final diameter
C. Mix additives
D. Reduce drilling fluid viscosity
Answer: B
Reaming increases bore diameter to accommodate the product pipe.
, 8. Excessive torque during drilling may indicate:
A. Proper lubrication
B. Low fluid pressure
C. Obstruction or improper fluid circulation
D. Correct reamer sizing
Answer: C
High torque often signals resistance due to cuttings buildup or obstruction.
9. The minimum cover depth beneath roadways is typically:
A. 6 inches
B. 12 inches
C. As specified in project design and utility standards (often 36” or more)
D. 3 feet maximum
Answer: C
Design specifications determine minimum cover to prevent structural damage.
10. Which OSHA regulation applies most directly to excavation safety?
A. 1910 Subpart Z
B. 1926 Subpart P
C. 1926 Subpart D
D. 1910 Subpart S
Answer: B
OSHA 1926 Subpart P governs excavation and trenching safety.
11. Drill rods primarily transmit:
Practice Exam 2026 | 200 Newest Exam-Style
Questions with Answers & Detailed Rationales |
Instant Pdf Download
Coverage – Louisiana (LA) 7-136 Horizontal Directional Drilling Exam
The Louisiana (LA) 7-136 Horizontal Directional Drilling (HDD) exam tests knowledge
of:
HDD methods and bore planning
Soil conditions and geotechnical considerations
HDD equipment, tooling, and tracking systems
Drilling fluids and mud management
Reaming and pipe pullback procedures
Utility locating and damage prevention
OSHA safety standards and jobsite hazards
Environmental protection and frac-out response
Louisiana licensing rules and contractor compliance
The exam focuses on safe, accurate, and code-compliant trenchless installation of
underground utilities in accordance with Louisiana contractor regulations.
,1. What is the primary purpose of a pilot bore in HDD?
A. Install casing
B. Establish final bore diameter
C. Create the guided bore path
D. Pull back product pipe
Answer: C
The pilot bore establishes the precise underground path before reaming and pullback
operations begin.
2. Bentonite in drilling fluid primarily functions to:
A. Harden soil
B. Stabilize the borehole and suspend cuttings
C. Increase drilling speed
D. Reduce torque only
Answer: B
Bentonite forms a filter cake along the borehole wall, preventing collapse and carrying
cuttings to the surface.
3. A steering tool in HDD is used to:
A. Mix drilling mud
B. Monitor bore direction and pitch
C. Increase hydraulic pressure
D. Detect gas leaks
Answer: B
Steering tools provide real-time data on inclination and direction to maintain bore alignment.
4. The optimal entry angle for most HDD projects typically ranges between:
A. 2°–5°
B. 8°–20°
,C. 30°–45°
D. 50°–60°
Answer: B
Entry angles between 8° and 20° balance depth control and drill rod stress.
5. What is a “frac-out” during HDD operations?
A. Tool joint failure
B. Sudden loss of torque
C. Unintended drilling fluid release to the surface
D. Bore collapse
Answer: C
Frac-out occurs when drilling fluid escapes through soil fractures to the ground surface.
6. Which soil type presents the greatest risk of bore collapse?
A. Solid rock
B. Loose sandy soil
C. Clay
D. Shale
Answer: B
Loose sand lacks cohesion and may collapse without proper fluid support.
7. The reaming process in HDD is performed to:
A. Change bore direction
B. Enlarge the pilot bore to final diameter
C. Mix additives
D. Reduce drilling fluid viscosity
Answer: B
Reaming increases bore diameter to accommodate the product pipe.
, 8. Excessive torque during drilling may indicate:
A. Proper lubrication
B. Low fluid pressure
C. Obstruction or improper fluid circulation
D. Correct reamer sizing
Answer: C
High torque often signals resistance due to cuttings buildup or obstruction.
9. The minimum cover depth beneath roadways is typically:
A. 6 inches
B. 12 inches
C. As specified in project design and utility standards (often 36” or more)
D. 3 feet maximum
Answer: C
Design specifications determine minimum cover to prevent structural damage.
10. Which OSHA regulation applies most directly to excavation safety?
A. 1910 Subpart Z
B. 1926 Subpart P
C. 1926 Subpart D
D. 1910 Subpart S
Answer: B
OSHA 1926 Subpart P governs excavation and trenching safety.
11. Drill rods primarily transmit:
