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Source: Horizontal Technology, Inc.
Author: John English
Three Unique Projects Highlight Durability, Versatility & Value.>
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Source: Horizontal Technology, Inc.
Author: John English
"The hardest thing to explain is the glaringly evident which everybody has decided not to see."
Ayn Rand, The Fountainhead
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Source: Underground Construction
Author: John English
In just a few short decades the use of Horizontal Directional Drilling...
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Drilling Motors

Horizontal Technology provides the best HDD Motor available!  A high-torque, low flow motor, engineered to meet the unique demands of horizontal directional drilling, these rugged motors improve penetration rates and last longer, saving the contractor time and money.    

The demands of Pipeline & Utility Construction are unique and Horizontal Technology, Inc. developed The HDD Motor a decade ago to meet those challenges.   Proven and reliable this motor is now the HDD industries recognized work horse.  Every single feature of this motor has been specifically designed to assist the HDD contractor.

"This HDD Motor improves performance and lowers costs."

KEY FEATURES
BENEFITS
  LOW-FLOW Maximum performance at lower GPM lowers mud costs, reduces wear & tear on your pumps and cleaning equipment.
  HIGH-TORQUE Increases penetration rates and reduces damaging stalls.
  OPTIMAL RPM Motor is designed to better accommodate tri-cone bit RPM specifications and extend life of bits.
  SHORTER LENGTH

Allows the steering tool to be closer to the bit and improves guidance capabilities.

  ADJUSTABLE HOUSING

Allows on site adjustments, reduces downtime and improves guidance capabilities.

  SAFETY CATCH SUB Offers protection from possible fishing operations.



  • 3 3/4"
    Motor Specs
  • 4 3/4"
    Motor Specs
  • 6 3/4"
    Motor Specs
  • 8"
    Motor Specs
  • Adjust Housing
    Instructions
  • Drilling
    Considerations


Downhole Drilling Motor
375 - 910 - 4.0


  • 3-3/4" OD
  • 9:10 Lobe
  • 4.0 Stage
  • Slow Speed
  • High Torque
Flow Rate *Rev/Gal
60 GPM 0.83
100 GPM 1.00
140 GPM 1.07


Motor Specifications English Metric
Model Number
375 - 910 - 4
Rotor Lobes / Stator Lobes
9 / 10
Number of Stages
4.0
Outer Diameter 3-3/4 in 95 mm
Weight 379 lbs 172 kgs
Length 12.4 ft 3.79 m
Full Load Bit Speed
50 - 150 rpm
Flow Rate 60 - 140 gpm 227 - 530 lpm
Peak Torque 1,550 ft-lbs 2,100 N-m
Peak Developed Power 33 hp 25 kw
Bit to Bend 46 in 1,168 mm
Full Load Differential Pressure 600 psi 4,140 kpa
Peak Torque Differential Pressure 800 psi 5,520 kpa
Maximum Bit Pressure Drop 1,500 psi 10,300 kpa
Maximum Weight on Bit 12,000 lbs 53 kN
Maximum Pull to-Run Motor 70,000 lbs 226 kN
Pull to Yield Motor 200,000 lbs 890 kN
Upper Box Connection
2-7/8 REG
Lower Bit Box Connection
2-7/8 REG

 

375 - 910 - 4 BUILD RATE TABLE( Degrees / 100ft )
ABH
SET
ANGLE
 
SLICK BEARING HOUSING
 
STABILIZED BEARING HOUSING
HOLE SIZE
HOLE SIZE
4-3/4" 5" 5-1/2" 5-7/8" 4-3/4" 5" 5-1/2" 5-7/8"
.35         4.79 5.66 7.38 8.66
.69 1.51       9.03 9.88 11.59 12.86
1.04 6.96 4.70 .29   13.38 14.24 15.93 17.19
1.37 12.09 9.83 5.40 2.15 17.49 18.34 20.02 21.27
1.69 17.07 14.80 10.35 7.09 21.48 22.32 23.99 25.23
2.0 21.90 19.62 15.16 11.89 25.34 26.17 27.83 29.06
2.29 26.41 24.13 19.65 16.37 28.95 29.78 31.42 32.65
2.57 30.77 28.48 23.99 20.70 32.44 33.26 34.90 36.11
2.83 34.82 32.52 28.02 24.72 35.68 36.50 38.12 39.33
3.06 38.40 36.10 31.58 28.27 38.55 39.36 40.97 42.18
3.28 41.82 39.52 34.99 31.67 41.29 42.10 43.70 44.90
3.46 44.63 42.31 37.78 34.46 43.54 44.34 45.94 47.13
3.63 47.27 44.96 40.42 37.09 45.65 46.45 48.05 49.23
3.76 49.30 46.98 42.43 39.10 47.28 48.07 49.66 50.84
3.86 50.85 48.53 43.98 40.64 48.52 49.32 50.90 52.08
3.94 52.10 49.78 45.22 41.88 49.52 50.31 51.89 53.07
3.98 52.72 50.40 45.84 42.50 50.02 50.81 52.39 53.56
4.0 53.03 50.71 46.15 42.81 50.27 51.06 52.64 53.81






Downhole Drilling Motor
475 - 910 - 4.0


  • 4-3/4" OD
  • 9:10 Lobe
  • 4.0 Stage
  • Slow Speed
  • High Torque
Flow Rate *Rev/Gal
100 GPM 0.50
175 GPM 0.64
250 GPM 0.70


Motor Specifications English Metric
Model Number
475 - 910 - 4
Rotor Lobes / Stator Lobes
9 / 10
Number of Stages
4.0
Outer Diameter 4-3/4 in 120 mm
Weight 1,100 lbs 499 kg
Length 20.5 ft 6.25 m
Full Load Bit Speed 70- 175 rpm
Flow Rate 100 - 250 gpm 379 - 946 lpm
Peak Torque 5,000 ft-lbs 6,780 N-m
Peak Developed Power 125 hp 93 kw
Bit to Bend 46 in 1,168 mm
Full Load Differential Pressure 600 psi 4,140 kpa
Peak Torque Differential Pressure 800 psi 5,520 kpa
Maximum Bit Pressure Drop 1,500 psi 10,300 kpa
Maximum Weight on Bit 25,000 lbs 111 kN
Maximum Pull to-Run Motor 100,000 lbs 445 kN
Pull to Yield Motor 300,000 lbs 1,334 kN
Upper Box Connection
3-1/2 Reg
3-1/2 IF
Lower Bit Box Connection
3-1/2 Reg

 

475 - 910 - 4 BUILD RATE TABLE( Degrees / 100ft )
ABH
SET
ANGLE
 
SLICK BEARING HOUSING
 
STABILIZED BEARING HOUSING
HOLE SIZE
HOLE SIZE
6" 6-1/8" 6-3/4" 7-7/8" 6" 6-1/8" 6-3/4" 7-7/8"
0.31         3.31 3.54 4.69 6.74
0.62         6.37 6.60 7.74 9.78
0.93 2.40 1.59     9.44 9.66 10.80 12.81
1.22 5.74 4.93 .95   12.30 12.53 13.65 15.65
1.50 8.97 8.16 4.16   15.07 15.30 16.41 18.40
1.76 11.97 11.16 7.15 .25 17.64 17.87 18.97 20.95
2.00 14.74 13.92 9.91 2.99 20.02 20.24 21.34 23.30
2.23 17.39 16.57 12.55 5.62 22.29 22.51 23.60 25.55
2.42. 19.58 18.76 14.74 7.79 24.17 24.39 25.48 27.41
2.60 21.66 20.84 16.81 9.85 25.95 26.17 27.25 29.18
2.74 23.27 22.45 18.42 11.45 27.33 27.55 28.63 30.55
2.85 24.54 23.72 19.68 12.71 28.42 28.64 29.71 31.63
2.93 25.47 24.64 20.60 13.62 29.21 29.43 30.50 32.41
2.98 26.04 25.22 21.17 14.20 29.71 29.92 31.00 32.90
3.00 26.27 25.45 21.40 14.43 29.91 30.12 31.19 33.10






Downhole Drilling Motor
675 - 910 - 2.0


  • 6-3/4" OD
  • 9:10 Lobe
  • 2.0 Stage
  • Slow Speed
  • High Torque
Flow Rate *Rev/Gal
250 GPM 0.20
425 GPM 0.27
600 GPM 0.30


Motor Specifications English Metric
Model Number
675 - 910 - 2
Rotor Lobes / Stator Lobes
9 / 10
Number of Stages
2.0
Outer Diameter 6-3/4 in 172 mm
Weight 1,795 lbs 814 kg
Length 17.0 ft 5.18 m
Full Load Bit Speed 50 -180 rpm
Flow Rate 250 - 600 gpm 946 - 2,271 lpm
Peak Torque 8,000 ft-lbs 10,847 N-m
Peak Developed Power 206 hp 154 kw
Bit to Bend 76 in 1,930 mm
Full Load Differential Pressure 300 psi 2,068 kpa
Peak Torque Differential Pressure 400 psi 2,758 kpa
Maximum Bit Pressure Drop 1,500 psi 10,300 kpa
Maximum Weight on Bit 75,000 lbs 333 kN
Maximum Pull to-Run Motor 225,000 lbs 1,000 kN
Pull to Yield Motor 650,000 lbs 2,891 kN
Upper Box Connection
4 - 1/2 Reg
4 - 1/2 IF
Lower Bit Box Connection
4 - 1/2 Reg

 

675 - 910 - 2 BUILD RATE TABLE( Degrees / 100ft )
ABH
SET
ANGLE
 
SLICK BEARING HOUSING
 
STABILIZED BEARING HOUSING
HOLE SIZE
HOLE SIZE
*7-7/8" 8-1/2" 8-3/4" 9-7/8" *7-7/8" 8-1/2" 8-3/4" 9-7/8"
0.31 1.56       3.00 4.15 4.60 6.63
0.62 5.08 2.68 1.74   5.50 6.63 7.08 9.10
0.93 8.59 6.19 5.24 1.07 7.99 9.12 9.57 11.57
1.22 11.88 9.47 8.52 4.33 10.32 11.44 11.89 13.88
1.50 15.06 12.64 11.68 7.48 12.58 13.69 14.13 16.11
1.76 18.01 15.58 14.62 10.40 14.67 15.77 16.21 18.18
2.00 20.73 18.29 17.33 13.10 16.60 17.70 18.14 20.10
2.23 23.34 20.89 19.93 15.68 18.45 19.54 19.98 21.93
2.42. 25.50 23.04 22.08 17.82 19.98 21.07 21.50 23.44
2.60 27.54 25.08 24.11 19.84 21.43 22.51 22.95 24.88
2.74 29.13 26.66 25.69 21.42 22.55 23.64 24.07 26.00
2.85 30.37 27.91 26.94 22.66 23.44 24.52 24.95 26.87
2.93 31.28 28.81 27.84 23.56 24.08 25.16 25.59 27.51
2.98 31.85 29.38 28.41 24.12 24.48 25.56 25.99 27.91
3.00 32.08 29.61 28.63 24.34 24.64 25.72 26.15 28.07






Downhole Drilling Motor
800 - 910 - 4.0


  • 8-0" OD
  • 9:10 Lobe
  • 4.0 Stage
  • Slow Speed
  • High Torque
Flow Rate *Rev/Gal
300 GPM 0.17
600 GPM 0.19
900 GPM 0.20


Motor Specifications English Metric
Model Number
800 - 910 - 4
Rotor Lobes / Stator Lobes
9 / 10
Number of Stages
4.0
Outer Diameter 8.0 in 203 mm
Weight 2,934 lbs 1,331 kg
Length 23.2 ft 7.07 m
Full Load Bit Speed 50 -180 rpm
Flow Rate 300 - 900 gpm 1,135 - 3,407 lpm
Peak Torque 14,800 ft-lbs 20,000 N-m
Peak Developed Power 383 hp 286 kw
Bit to Bend 86 in 2,179 mm
Full Load Differential Pressure 600 psi 4,140 kpa
Peak Torque Differential Pressure 800 psi 5,520 kpa
Maximum Bit Pressure Drop 1,500 psi 10,300 kpa
Maximum Weight on Bit 80,000 lbs 356 kN
Maximum Pull to-Run Motor 300,000 lbs 1,334 kN
Pull to Yield Motor 800,000 lbs 3,558 kN
Upper Box Connection
6-5/8 REG
Lower Bit Box Connection
6-5/8 REG

 

800 - 910 - 4 BUILD RATE TABLE( Degrees / 100ft )
ABH
SET
ANGLE
 
SLICK BEARING HOUSING
 
STABILIZED BEARING HOUSING
HOLE SIZE
HOLE SIZE
9-7/8" 10-5/8" 12-1/4"   9-7/8" 10-5/8" 12-1/4"  
0.31         3.08 3.90 5.66  
0.62 .51       5.14 5.95 7.70  
0.93 3.26 1.32     7.19 8.0 9.73  
1.22 5.83 3.88     9.11 9.91 11.64  
1.50 8.31 6.35 2.26   10.97 11.76 13.48  
1.76 10.61 8.65 4.54   12.69 13.48 15.18  
2.00 12.74 10.77 6.65   14.28 15.07 16.76  
2.23 14.77 12.80 8.67   15.80 16.59 18.27  
2.42. 16.46 14.48 10.34   17.06 17.84 19.52  
2.60 18.05 16.07 11.92   18.25 19.03 20.70  
2.74 19.29 17.31 13.15   19.18 19.96 21.62  
2.85 20.27 18.28 14.12   19.91 20.68 22.35  
2.93 20.98 18.99 14.82   20.44 21.21 22.87  
2.98 21.42 19.43 15.26   20.77 21.54 23.20  
3.00 21.60 19.61 15.44   20.90 21.68 23.33  






Adjust Housing Instructions


Setting the ABH (if equipped)
Setting the adjustable bend housing is a fairly simple operation. Below is the procedure for setting the Toro adjustable bend housing:

1 Tong in the areas as shown in Figure 8. Do not tong on the Orientation Sleeve.
2 Break apart the ABH connection
3 Unthread the Lower ABH Housing two to four complete turns

 


4 Referencing Figure 9, slide the Orientation Sleeve down to disengage the interlocking teeth.
5 To adjust the bend angle, rotate the Orientation Sleeve (no more than ½ turn either direction) until the desired bend angle mark is in-line with the identical bend angle mark on the Upper ABH Housing.
6 Referencing Figure 10, slide the Orientation Sleeve upward so that the interlocking teeth are fully engaged.
7 Check to see if the desired bend angle marks on both the Upper ABH Housing and the Orientation Sleeve are in-line.
8 Apply thread dope to the bottom face of the Orientation Sleeve. Caution – Do not use thread locking compound on the ABH connections.

9 While keeping the Orientation Sleeve fully engaged in the Upper ABH Housing, thread on the Lower ABH Housing until it shoulders against the Orientation Sleeve.
10 Tong in the areas as shown in Figure 8 and apply the appropriate torque to the connection. See the Table on the next page for the recommended ABH torque values.
11 The bend angle marks on the Upper ABH Housing and the Orientations Sleeve that match and are in-line with each other tell the angle of the ABH. In addition, these matching and in-line bend angle marks indicate the high side of the tool.


Note: an ABH Angle Mark Identification Guide is
located in the back of this manual.

 



Adjust Housing Instructions
Motor OD English Metric
2-7/8 (287) 2,200 ft-lbs 3,000 N-m
3-1/8 (313) 2,700 ft-lbs 3,600 N-m
3-1/2 (350) 3,800 ft-lbs 5,100 N-m
3-3/4 (375) 4,600 ft-lbs 6,300 N-m
4-3/4 (475) 7,000 ft-lbs 9,500 N-m
5-1/2 (550) 16,000 ft-lbs 21,700 N-m
6-1/2 (650) 23,000 ft-lbs 31,000 N-m
6-3/4 (675) 25,000 ft-lbs 34,000 N-m
8-0 (800) 35,000 ft-lbs 47,000 N-m
8-1/2 (850) 38,000 ft-lbs 51,000 N-m
9-5/8 (963) 61,000 ft-lbs 83,000 N-m




Drilling Considerations



The performance and life of the motor is determined by the environment in which it operates. To ensure optimum performance and longest life avoid:

  • Abrasive solids in the circulating system. The drilling fluid should have the least possible sand content
    (1% or less is recommended).
  • Excessive rotation of motor set with higher bend (Anything over 1.5 degrees is considered high bend).
  • Exceeding recommended weight on bit (WOB) loads.
  • Exceeding the recommended pressure drop across the bit & motor.
  • Repeated stalling of the motor.
  • Tripping without actuation of pumps.


Differential Pressure

The primary rig reference for HTI motor operation is the rig pressure gauge. Weight (push) indicator can also be used as a drilling reference, however it may give inaccurate information about the actual WOB because of other factors such as the size of the hole the pipe is in, softness of the formation or restrictions reducing the actual WOB. The only true indication of the motor performance is the pressure gauge.

When the motor is off-bottom circulating the pressure gauge shows the total amount of pressure required to pump a known volume of fluid through the motor and bit. This is called the off-bottom pressure.

WOB (placing weight on the bit) creates a higher total pressure. The difference between the off-bottom pressure and the pressure when weight is applied to the bit is called the pressure differential. 
Operate the motor at the recommended differential (the PSI difference between off-bottom pressure and on-bottom pressure. As weight is applied to the bit the pressure will increase. As the bit advances the pressure will decrease until more push (weight) is applied.  For best performance and penetration rates maintain optimum on-bottom pressure.

When too much weight or push is applied, exceeding the maximum differential pressure, the motor will stall. The bit will cease to rotate causing the pressure gauge to rise abruptly.  Stall pressure is about twice the recommended optimum differential pressure. When a stall happens, stop the pumps and reduce the WOB allowing the pressure to decrease to recommended operational pressures. Do not pull the motor off bottom until normal pressure is resumed. Continual stalling and operating motors in stalled condition can seriously damage the motor. Stalling can lead to tearing or “chunking” of the stator elastomer. When a stator is chunked, motor performance will dramatically decrease or the motor will possibly cease to function. 

 







 

 





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