GT35 DRILL RIG

The GT35 model is designed to drill up to 650ft deep boreholes productively but can reach depths beyond 1,300 feet (400 meters) using mud, air, and hammer drilling methods. It is equipped with our unique rod rack and loading system, which is the most robust, reliable, and safest rod handling system on the market, ensuring maximum safety and efficiency in all drilling operations.

The GT series of drill rigs are known for their high productivity and reliability in geothermal drilling, with proven performance in both domestic and commercial applications around the world. These rigs are the number one choice for leading industry professionals, thanks to their versatility and ability to handle a variety of drilling conditions with precision and efficiency.

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Built with

35,000 LBS
PULL-BACK
290HP
DOOSAN ENGINE
20FT DRILL RODS
880FT ON BOARD RODS
DRILL BEYOND
650FT

SPECIFICATIONS

DIMENSIONS & WEIGHT

Length 38′ 7″ (11.8m)
Width 7′ 8″ (2.4m)
Height 10′ 3″ (3.2m)
Weight 44,000 lbs – 55,000 lbs
(20,000 kg – 25,000 kg)(Actual weight will vary depending on the options selected and installed, e.g. Rods.)

DERRICK & FEED SYSTEM

35,274 lbs (16,000 kg) pull-back
14,330 Ibs (6,500 kg) push-down
24′ 7″ (7.5 m) top head stroke

DRILL PIPE & CASING

3 ½” (88.9 mm) × 20′ (or 6 m)
40 rod capacity – 880′ (or 264 m)
Max diameter 12 ½” (320 mm)

ENGINE

Doosan DL08 Tier 4 (Stage 5)
290 hp (213 kW)
Typical engine speed – 1,400 rpm – 1,600 rpm
Max engine speed – 1,800 rpm

ROTARY DRILL HEAD

Variable twin Eaton motor head with 2.4″ (60 mm) thru-hole
0-135 rpm @ 6,195 lb-ft (8.4 kNm)
0-260 rpm @ 3,097 lb-ft (4.2 kNm)

CRAWLER (TRACK) BASE

Doosan Solar 75
Steel with rubber pads
Wireless remote travel

GTD STANDARD FEATURES

Sideshift – Sliding Drill Head
Swivel & Floating Spindle Sub
Height Adjustable Working Table
Double Clamps – One Rotating
Hydraulic Centralizing Rollers
Hydraulic Breakout Chain Wrench
Auxiliary Hydraulic Ports and Controls
Main Winch – 11,000 lbs (5,000 kg)
Wire/Sandline Winch

Water Injection Mist Pump
DTH Lube System
Rod Rack & Rod Loader
Hydraulic Welder & Generator (7.5Kw)
Self Loading Jacks/ Outriggers
Air Compressor: 24 cfm (673 lpm), 130 psi (9 bar)
Centrifugal Pump: 4x3x13 Single-stage
4.5 x 5.5 Triplex Piston Pump:
264 gpm @ 580 psi (1,000 lpm @ 40 bar)
Tablet Computer & Engine Diagnostics Software

OPTIONS

Hydraulic Sliding Rod Wrench
Angled Drilling
Triple Clamps
Air Drilling Skirt
Safety Cage
EURODRILL RH16X Rotary Drill Head (11,896 lb-ft)
Hydraulic Welder & Generator (7.5 kW)
High Torque Head Motors and Reduction Gearbox (24% increase in Torque)
Triplex Piston Pump (MP1200) 5X6 : 317 gpm @ 580 psi (1200 lpm @ 40 bar)

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Specs can be informative… Videos provide evidence…

It’s why we share real-world drilling footage to validate why our equipment is the No.1 choice for geothermal industry leaders. See for yourself below:

How deep can the GT35 drill?

The GT35 is designed to drill boreholes to 650 ft productively, and can reach beyond 1,300 ft (400 m) with mud, air or DTH hammer. That covers most domestic and commercial ground source heat pump loops.

Compare depths across the GT Series

What engine and pull-back does the GT35 have?

A Doosan DL08 Stage 5 engine rated at 290 hp (213 kW), and 35,000 lbs (16,000 kg) of pull-back with 14,330 lbs (6,500 kg) of push-down over a 24 ft 7 in (7.5 m) head stroke.

How big and heavy is the GT35 to move?

It is 38 ft 7 in (11.8 m) long, 7 ft 8 in (2.4 m) wide and 10 ft 3 in (3.2 m) high, and weighs 44,000–55,000 lbs (20,000–25,000 kg) depending on the options and rods on board. It sits on Doosan Solar 75 tracks with steel and rubber pads, and travels on a wireless remote.

Which mud pumps come on the GT35?

A 4×3×13 single-stage centrifugal pump and an MP1000 4.5×5.5 triplex piston pump (264 gpm at 580 psi), so you have high flow and high pressure on the same rig. The larger MP1200 5×6 triplex (317 gpm at 580 psi) is an option.

See GTD mud pumps

Can I upgrade the GT35’s drill head?

Yes. The standard head is a variable twin-motor head giving 6,195 lb-ft at up to 135 rpm, or 3,097 lb-ft at up to 260 rpm. High-torque motors with a reduction gearbox add 24% torque, and the Eurodrill RH16X option almost doubles it. If you need that torque every day, the GT45 carries the RH16X as standard.

See the GT45

Is the rod rack standard on the GT35?

Yes. Every GT rig, the GT35 included, carries our own rod rack and rod loader as standard — the most robust, reliable and safest rod handling system on the market — along with double clamps (one rotating) opening to 12½ in (320 mm), hydraulic centralizing rollers and a breakout chain wrench.

Can I monitor the rig remotely?

Yes. GTData puts rate of penetration, torque, RPM, pressures, fuel, weight on bit and depth on a live read-out above the driller’s controls and on a cloud dashboard, with alerts that flag bit wear, formation changes and maintenance before they cost you a shift.

About GTData rig monitoring

GEOTHERMAL DRILLING RIGS

The GT series drill rigs are proven for their high productivity in Geothermal and Water Well drilling in both domestic and commercial use. From our flagship Double-Head rig, featuring a Cummins X12 engine, to our smallest compact rig with Doosan power. All models are versatile machines, with full capability for Mud, Air or DTH drilling.