Nathaniel Darrell Koelling
Vernal,UT
Summary
Results-driven equipment operations professional skilled in diagnosing complex system failures and implementing preventive maintenance strategies. Demonstrated ability to enhance operational efficiency and safety compliance through effective teamwork and streamlined workflows. Committed to maintaining high standards of quality assurance.
Overview
1
1
Certification
27
27
years of professional experience
Work History
JFE
The Wireline Group
Vernal, UT
05.2026 - Current
- Oversaw the inspection, assembly, and preventive maintenance (PM)
- Diagnosed and repaired complex electro-mechanical, hydraulic, and telemetry system failures
- Implemented standardized post-job maintenance workflows
- Employed asset tracking software to enhance inventory accuracy and availability.
- Supervised spare-parts inventory to ensure availability
- Collaborated with cross-functional teams to align efforts and achieve project goals.
- Utilized advanced technical skills and expertise to troubleshoot complex problems and implement solutions.
- Utilized software and tools to streamline processes and improve overall performance.
Completions Specialist
Schlumberger
Vernal, UT
11.2022 - 05.2026
- Executed meticulous tool redressing, replacing high-tolerance seals, O-rings, and mechanical components to ensure 100% compliance with SLB engineering standards.
- Diagnosed and repaired complex electro-mechanical faults, telemetry failures, and hydraulic system leaks, thereby reducing turnaround time by enhancing troubleshooting efficiency.
- Directed comprehensive preventive maintenance (PM), calibration, and testing to ensure optimal equipment reliability and performance.
- Analyzed equipment runtime data and historical maintenance logs to optimize predictive maintenance cycles.
- Managed a localized spare-parts and consumables inventory utilizing CMMS tracking software to reduce stockouts and optimize overhead costs.
- Coordinated cross-functional teams to streamline operational workflows, improving collaboration and task execution.
- Contributed to compliance activities by participating in training programs to ensure regulatory adherence.
- Coordinated with other departments to ensure efficient workflow processes.
- Enforced zero-compromise QHSE standards in the workshop, including hazardous energy isolation (LOTO), pressure testing safety protocols, and chemical handling regulations.
Freedom Series Service Tech
Downing Wellhead
Oklahoma City, OK
07.2021 - 11.2022
- Performed comprehensive preventive and corrective maintenance (PM/CM) on complex automated gate valve networks and mechanical latch systems, ensuring 100% operational readiness.
- Diagnosed and rebuilt high-tolerance mechanical assemblies, replacing seals, gaskets, and internal components to guarantee zero-leak performance under extreme industrial conditions.
- Maintained and calibrated hydraulic power units ()HPUs, actuators, and pneumatic control lines, troubleshooting system pressure drops and fluid delivery anomalies.
- Executed hydrostatic pressure testing (up to 15,000 PSI) to ensure structural integrity and safety compliance of fluid containment vessels and manifold systems.
- Utilized advanced automated control software to track equipment performance, identifying early signs of component wear to schedule proactive repairs and prevent catastrophic failures.
- Conducted Root Cause Analysis (RCA) on mechanical and hydraulic deviations, collaborating with engineering teams to implement permanent equipment modifications.
- Adhered to strict Lock-Out/Tag-Out (LOTO) procedures, job safety analyses (JSA), and hazardous energy isolation protocols during all heavy machinery interventions.
- Managed localized inventory of critical spare parts and rebuild kits to streamline equipment turnaround.
Maintenance Tech II
Amazon/ELS
Oklahoma City, OK
06.2020 - 07.2021
- Industrial Maintenance: Preventive Maintenance (PM), Predictive Maintenance (PdM), Corrective Maintenance (CM), Fault Isolation, Alignment & Calibration.
- Electrical & Automation: Electro-Mechanical Troubleshooting, Control Interfaces, Digital Telemetry, Circuit Testing, Digital Multimeter. Handled urgent maintenance requests to maintain operational continuity.
- Mechanical & Fluid Power: Industrial Hydraulics & Pneumatics, Heavy Mechanical Rebuilds, Actuators, Valves, Manifolds, Gearboxes, High-Pressure Containment.
- Safety & Systems: Lock-Out/Tag-Out (LOTO), Job Safety Analysis (JSA), CMMS Data Entry, Root Cause Analysis (RCA), Blueprint & Schematic Interpretation.
- Operated hand and power tools to complete maintenance tasks efficiently and safely.
- Maintained accurate records of repairs and maintenance activities for compliance.
- Collaborated with team to address maintenance challenges promptly. members to address maintenance challenges promptly.
- Responded swiftly to emergency maintenance requests to minimize downtime.
Completion Specialist
Schlumberger
El Reno, OK
09.2017 - 04.2020
- Diagnosed and repaired complex electro-mechanical faults, telemetry failures, and hydraulic system leaks, decreasing turnaround time.
- Executed meticulous tool redressing, replacing high-tolerance seals, O-rings, and mechanical components to ensure 100% compliance with SLB engineering standards.
- Directed comprehensive preventive maintenance (PM), calibration, and testing to enhance equipment reliability.
- Analyzed equipment runtime data and historical maintenance logs to optimize predictive maintenance cycles.
- Managed localized spare-parts and consumables inventory with CMMS tracking software, ensuring availability and minimizing stockouts.
- Coordinated cross-functional teams to streamline operational workflows, improving communication and efficiency.
- Coordinated with other departments to ensure efficient workflow processes.
- Contributed to compliance training initiatives to maintain regulatory standards and improve team knowledge.
- Enforced zero-compromise QHSE standards in the workshop, including hazardous energy isolation (LOTO), pressure testing safety protocols, and chemical handling regulations.
Equipment Operator
Performance Technologies
El Reno, OK
10.2016 - 09.2017
- Executed hourly PM schedules (greasing, fluid changes, filter replacements, torque checks) on a fleet of mobile industrial equipment, minimizing Non-Productive Time (NPT).
- High-Pressure Fluid Power Maintenance, Rebuilding and maintaining high-pressure fluid ends, replacing valves, seats, packings, and plungers on positive displacement pumps.
- Heavy Mechanical Troubleshooting, Diagnosing failures in high-horsepower diesel or natural gas engines, transmissions, power take-offs (PTOs), and heavy-duty gearboxes.
- Manifold & Surface Iron Recertification, Disassembling, inspecting, replacing seals, and pressure testing high-pressure iron (up to 15,000 PSI) and automated missile manifolds to ensure structural integrity.
- Implemented Lock-Out/Tag-Out (LOTO) protocols on pressurized systems and troubleshot electronic sensor networks (pressure transducers, flow meters) to enhance safety compliance.
Completions specialist
Schlumberger
Oklahoma City, OK
06.2012 - 02.2016
- Executed meticulous tool redressing, replacing high-tolerance seals, O-rings, and mechanical components to ensure 100% compliance with SLB engineering standards.
- Diagnosed and repaired complex electro-mechanical faults, telemetry failures, and hydraulic system leaks, which decreased turnaround time.
- Directed preventive maintenance (PM), calibration, and testing to enhance equipment reliability.
- Analyzed equipment runtime data and historical maintenance logs to optimize predictive maintenance cycles.
- Managed localized spare-parts and consumables inventory with CMMS tracking software to minimize stockouts and control overhead costs.
- Coordinated cross-functional teams to improve operational workflows and ensure seamless collaboration.
- Contributed to training initiatives to ensure adherence to industry regulations.
- Coordinated with other departments to ensure efficient workflow processes.
- Enforced zero-compromise QHSE standards in the workshop, including hazardous energy isolation (LOTO), pressure testing safety protocols, and chemical handling regulations.
Senior Wireline Operator
Thrubit logging solutions
Tyler, TX
01.2011 - 06.2012
- Heavy Machinery Overhaul, Maintaining and troubleshooting high-torque hydraulic wireline winch systems, diesel generators, spooling mechanisms, and mechanical tension devices.
- Hydraulic & Heavy Equipment Maintenance, Inspected, lubricated, and repaired high-pressure hydraulic winch systems, electric spooling drives, and mechanical tension-monitoring equipment.
- Precision Mechanical Assembly, Assembling and redressing high-tolerance downhole instruments, replacing dynamic seals, O-rings, and specialized structural barriers exposed to extreme pressures and temperatures.
- Oversaw disassembly, cleaning, structural seal replacement, and mechanical re-torquing of high-tolerance logging instruments, ensuring durability in high-temperature, high-pressure (HTHP) environments.
- Managed equipment run-time logs, tracked asset degradation, and performed pre- and post-job calibrations, ensuring optimal tool reliability.
- Electro-Mechanical Fault Isolation, diagnose digital and analog telemetry failures, low-voltage power distribution issues, and sensor anomalies using schematics and multimeters.
- Supervised laboratory testing and safety procedures for radioactive and explosive downhole logging components, ensuring compliance with regulatory criteria and corporate safety guidelines.
Cased Hole Wireline Operator
Halliburton Energy Services
Kilgore, TX
09.2010 - 01.2011
- Rebuilt wireline conveyance heads to enhance tool performance
- Test and maintain down hole tools
- Maintained and operated pressure control equipment for safe and efficient operations
- Tested and maintained electrical lines to ensure operational reliability
- Ensured compliance with regulations while driving DOT vehicle.
- Secured explosive and radioactive licenses to meet regulatory requirements.
Correctional Officer
State of Oklahoma Department of Corrections
Granite, OK
04.2010 - 09.2010
- Prison Correctional Officer
- Controlled and maintained security of unit housing 160 inmates
- Maintained security by verifying the number of inmates present in the unit
- Enforce rules and regulations
- Completed detailed inmate disciplinary reports to document violations
- Distributed relevant information to inmates to ensure compliance with facility regulations
- Trained to transport inmates
- Trained to use non-lethal munitions and inflammatory agents
- General Correctional Officer duties
General Operator, Mechanical Sidewall Coring Tool
Schlumberger, Inc.
Tyler, OK
05.2004 - 06.2009
- Maintained and tested high-pressure internal hydraulic pumps, micro-valves, and mechanical arms that extend and retract tool pads under immense wellbore pressures to ensure reliability.
- Executed exhaustive post-job rebuilds, replacing high-tolerance Viton seals, cleaning complex grit from moving assemblies, and conducting structural load tests to restore equipment functionality.
- Diagnosed and rebuilt complex downhole electric motors, drive shafts, automated core-catcher mechanisms, and diamond-tipped coring bits to ensure optimal performance.
- Advanced Electro-Mechanical Calibration, Utilizing SLB diagnostic software, multimeters, and physical gauges to calibrate precision sensors, depth encoders, and digital telemetry packages.
Journeyman Millwright
Carpenters and Joiners of America
Los Angeles, CA
05.1999 - 05.2004
- Executed complex disassemblies, rebuilt components, and re-installed critical industrial rotating assets, including heavy gearboxes, multi-stage pumps, and high-horsepower electric motor drives, ensuring operational reliability.
- Laser Shaft Alignment, Performed precision shaft and coupling alignments utilizing advanced laser alignment systems to within ±0.002-inch tolerances, reducing mechanical vibration and extending bearing life cycle.
- Diagnosed and repaired high-volume hydraulic and pneumatic systems, automated conveyor belting, and directional valve manifolds, optimizing performance to maintain uninterrupted production throughput.
- Implemented predictive maintenance strategies to enhance equipment reliability and prevent breakdowns., Utilized vibration analysis and thermal imaging tools to identify early signs of mechanical degradation, scheduling proactive maintenance to eliminate catastrophic equipment failures.
- Engineered safe rigging plans to relocate and level multi-ton industrial assets; performed structural steel welding and fabrication to repair machinery frameworks and safety guarding, enhancing equipment stability.
Education
General Education -
Western Oklahoma State College
Altus, OKSkills
- Electro-mechanical troubleshooting
- Preventive maintenance
- Predictive maintenance
- Hydraulic system repair
- Equipment calibration
- CMMS tracking software
- Site operations management
- Regulatory Compliance
- Quality assurance
- Safety adherence
- Process improvement
- Problem solving
- Critical thinking
- Cross-functional teamwork
- Leadership skills
- Maintenance & repair
Personal Information
- Title: Dedicated Equipment Operations Professional
- Driving License: Class A CDL
Certification
- Class A CDL | Number: 240127050 | Expires: 05/05/2028, Journeyman Millwright License | Number: U1-2534-4108, Past certificates for OSHA, HazMat, Rigging, and Optical Alignment
Timeline
JFE
The Wireline Group
05.2026 - Current
Completions Specialist
Schlumberger
11.2022 - 05.2026
Freedom Series Service Tech
Downing Wellhead
07.2021 - 11.2022
Maintenance Tech II
Amazon/ELS
06.2020 - 07.2021
Completion Specialist
Schlumberger
09.2017 - 04.2020
Equipment Operator
Performance Technologies
10.2016 - 09.2017
Completions specialist
Schlumberger
06.2012 - 02.2016
Senior Wireline Operator
Thrubit logging solutions
01.2011 - 06.2012
Cased Hole Wireline Operator
Halliburton Energy Services
09.2010 - 01.2011
Correctional Officer
State of Oklahoma Department of Corrections
04.2010 - 09.2010
General Operator, Mechanical Sidewall Coring Tool
Schlumberger, Inc.
05.2004 - 06.2009
Journeyman Millwright
Carpenters and Joiners of America
05.1999 - 05.2004
General Education -
Western Oklahoma State College