Kotech KDP-33/25 diesel portable compressor at a deep water well drilling site in Northeast Brazil

Kotech KDP-33/25 High-Pressure Compressor Powers Deep Water Well Drilling in Brazil

The Kotech KDP-33/25 diesel portable rotary screw compressor was deployed for a 150-day deep water well drilling campaign in Northeast Brazil's semi-arid Sertão region. Delivering 33 m³/min at 25 bar, the two-stage compressor powered DTH hammers to drill 800-metre wells through granite and gneiss formations. Powered by a Cummins QSZ13-C550 engine with a tropical cooling package, the unit achieved 97.5% uptime, eliminated stuck-rod issues, and reduced fuel consumption by 20% compared to legacy equipment. The case study demonstrates the KDP-33/25's capability for high-pressure, deep-hole drilling in extreme heat and remote locations.

Water Well Drilling / Agricultural & Municipal Groundwater Extraction Alagoas & Bahia States, Northeast Region, Brazil 2023

Cilent/Project

Brazil Northeast Deep Water Well Drilling & Groundwater Development Project

Industy

Water Well Drilling / Agricultural & Municipal Groundwater Extraction

Project Location

Alagoas & Bahia States, Northeast Region, Brazil

Implementation Year

2023

Project Duration

90 Days (Multi-Well Drilling Campaign)

Customer Pain Points

Northeast Brazil faces chronic water scarcity. The semi-arid Sertão region relies heavily on groundwater from deep crystalline and sedimentary aquifers, with wells often drilled to 800 metres or deeper to reach reliable water sources. A Brazilian drilling contractor was awarded a contract to develop multiple production wells across the region to support agricultural irrigation and municipal supply.

The project had three critical challenges that standard compressors couldn't handle:

- Deep drilling through variable formations. At depths approaching 800 metres, the drill string passes through alternating layers of hard granite, gneiss, and fractured sandstone. DTH hammers need sustained high pressure—up to 25 bar—to maintain impact energy and flush cuttings from deep boreholes. The client's legacy compressors couldn't hold steady pressure at those depths.

- Inconsistent airflow for hole cleaning. At 800 metres, cuttings have to travel a long way. Insufficient or unstable airflow means cuttings settle in the borehole, causing stuck drill rods and lost time. The client was losing up to 8–10 hours per well to stuck rods and fishing operations.

- Fuel was a major expense. The drilling sites were located hundreds of kilometres from fuel depots. Every litre of diesel had to be trucked in, and the client's older compressors were burning through fuel at unsustainable rates.

The drilling supervisor later recalled: "We were spending more time clearing stuck rods than actually drilling. At 800 metres, every interruption costs you a full shift."

Solutions

Kotech deployed the KDP-33/25 diesel portable rotary screw air compressor—purpose-built for deep water well drilling applications. The unit is a two-stage screw compressor that operates at an exceptionally low rotor speed of just 1,900 rpm, significantly reducing wear and extending service life.

The engine powering the unit is the Cummins QSZ13-C550, a 13-litre, 6-cylinder inline turbocharged diesel producing 410 kW (550 HP) at 1,900 rpm, with peak torque of 2,650 Nm available across a broad operating band. This engine is widely used in heavy drilling equipment for its reliability, fuel efficiency, and global service network.

The compressor delivers 33 m³/min (1,165 CFM)at a working pressure of 25 bar (362 PSI). The two-stage compression design ensures stable pressure output even during long drilling cycles, preventing the pressure drops that plagued the client's previous equipment.

Three configurations made the difference for Brazil's variable terrain and weather conditions:

- Two-stage compression system. Delivers stable 25 bar output with minimal pressure fluctuation, ensuring consistent DTH hammer performance even at depth.
- Tropical cooling package. Northeast Brazil experiences temperatures exceeding 40°C. The high-ambient cooling system maintains stable operation in extreme heat.
- Heavy-duty chassis with large tyres. The ST235/80R16 tyres and robust towing chassis handle rough, unpaved access roads common in rural drilling sites.

The client integrated the KDP-33/25 with their rotary drilling rigs for a multi-well campaign across Alagoas and Bahia states.

Implementation Steps

Multi-site field assessment—Kotech engineers visited drilling locations across Northeast Brazil to verify geology, target depths, and infrastructure access
Equipment configuration—customized the KDP-33/25 with tropical cooling package; completed factory performance testing
Logistics and transport—coordinated delivery to remote drilling sites via existing road networks
On-site installation—managed pipeline connections and integration with existing DTH drilling systems
Full commissioning—conducted pressure calibration and operational parameter optimization under real drilling conditions
Continuous monitoring—performed field operation monitoring and output adjustment throughout the campaign
Operator training—delivered training on safe operation, preventive maintenance, and daily inspection standards

Customer results

Why Northeast Brazil?

The semi-arid Sertão region of Northeast Brazil receives less than 800 mm of annual rainfall, with some areas experiencing drought cycles lasting 5–7 years. Groundwater from deep crystalline aquifers is the primary water source for agriculture and municipal supply. Wells in this region are typically drilled to depths of 600–1,200 metres, with 800 metres being a common target for reliable water production.

Drilling contractors in this region face three persistent challenges: hard rock formations that require high-pressure DTH drilling, high ambient temperatures that test cooling systems, and long transport distances that make fuel efficiency critical.

The Drilling Challenge: 800 Metres of Hard Rock

Drilling a water well to 800 metres through granite and gneiss formations requires a compressor that can do three things well:

Hold pressure at depth.** DTH hammers lose efficiency if pressure drops. At 800 metres, the pressure delivered to the hammer can be 5–10% lower than at surface due to line losses. Starting with a steady 25 bar at the compressor ensures the hammer receives sufficient pressure at depth.

Deliver enough volume for cuttings removal. At 800 metres, cuttings must travel the full length of the borehole. Insufficient airflow allows cuttings to settle, causing stuck rods. The KDP-33/25's 33 m³/min provides the volume needed to lift cuttings from those depths.

Keep running in 40°C heat.High ambient temperatures reduce cooling efficiency and can cause overheating shutdowns. The tropical cooling package on the KDP-33/25 maintains consistent oil and water temperatures even during peak afternoon heat.

The Engine: Cummins QSZ13-C550

The QSZ13-C550 is a proven workhorse in the drilling industry. With 13 litres displacement and 550 HP at 1,900 rpm, it provides consistent power across the operating range. The broad torque band (2,650 Nm from 1,300–1,500 rpm) means the compressor can respond instantly to load changes without bogging down. This engine meets EU Stage III/Tier 3 emission standards and is serviceable across Brazil's Cummins dealer network.

Field Performance

Over the 150-day campaign, the KDP-33/25 delivered consistent performance across multiple wells. The stable 25 bar pressure eliminated the stuck-rod issues that had plagued the client's previous equipment. The site supervisor reported that the unit "kept the hammer hitting hard all the way to 800 metres."

Fuel efficiency was a major improvement. The client's older compressors averaged 28–30 litres per hour under load. The KDP-33/25, with the fuel-optimised QSZ13-C550 and Kotech's stepless capacity control, achieved approximately 23 litres per hour—a 20% reduction that generated significant cost savings over the campaign.

Kotech didn't just supply the compressor. We handled the full configuration, commissioning, and on-site support. One client summed it up: "I've used a lot of compressors in this region. This is the first time I haven't had to call the supplier for help."

The drilling supervisor's comment: "We were losing 8 to 10 hours per well to stuck rods before—and that adds up fast. With the KDP? Not one stuck rod across three wells. Pressure held steady all the way to depth. That's the difference between two weeks and three."

Products Used in This Case

eee

FAQ (Frequently Asked Questions)

What makes the Kotech KDP-33/25 suitable for 800-metre deep water well drilling?

The KDP-33/25 delivers 33 m³/min at 25 bar (362 PSI) through a two-stage compression system that maintains stable pressure even at depth. At 800 metres, line losses can reduce delivered pressure by 5–10%, so starting with a steady 25 bar at the compressor ensures the DTH hammer receives sufficient impact energy at the bottom of the hole. The unit's high airflow also provides the volume needed to lift heavy cuttings all the way from 800 metres to surface, preventing settled cuttings and stuck rods.

How does the tropical cooling package perform in Northeast Brazil's 40°C heat?

Northeast Brazil's semi-arid Sertão region experiences daytime temperatures regularly exceeding 40°C, particularly during the dry season. The KDP-33/25's tropical cooling package includes an oversized radiator and high-volume fan system designed for ambient temperatures up to 50°C. This ensures stable oil and coolant temperatures even during peak afternoon heat, preventing the thermal shutdowns that commonly affect standard compressors in this region. In the 150-day Brazilian campaign, the unit experienced zero heat-related downtime.

What fuel savings can I expect with the KDP-33/25 compared to older compressors?

In the Northeast Brazil project, the KDP-33/25 achieved approximately 23 litres per hour fuel consumption under load, compared to 28–30 litres per hour on the client's older compressors—a 20% reduction. This saving comes from two factors: the fuel-optimised Cummins QSZ13-C550 engine, and Kotech's stepless capacity control system, which automatically reduces engine RPM and intake air when the drill stops for rod changes, eliminating wasted fuel during idle periods.

How does the KDP-33/25 prevent stuck rods in deep boreholes?

Stuck rods are typically caused by insufficient or unstable airflow that fails to lift cuttings out of the borehole. At 800 metres, cuttings must travel the full length of the hole—any drop in pressure or volume allows heavy cuttings to settle back down, jamming the drill string. The KDP-33/25's two-stage compression system delivers a consistent 25 bar at 33 m³/min, providing the high-velocity air needed to flush cuttings continuously from bottom to surface. In the 150-day Brazilian campaign, the client reported zero stuck-rod incidents across three deep wells, eliminating the 8–10 hours of lost time per well that had been common with their previous compressors.