Sampling Custodian

Core Laboratories is the Reservoir Optimization Company

Core Laboratories Inc. is a leading provider of proprietary and patented reservoir description and production enhancement services and products used to optimize petroleum reservoir performance. The Company has over 70 offices in more than 50 countries and is located in every major oil-producing province in the world. We are well-positioned to serve the growing needs of the energy transition while continuing to fulfill the demand for reliable and affordable energy sources like crude oil and natural gas. Our services, products, expertise, and innovations will continue to be essential as our clients meet the growing demand for energy globally. For more information, visit 

At Core Lab, our values matter: Safety, Honesty and Integrity, Customer Focus, Building Trust, and Employee Development. We regard our employees as our greatest asset. We believe that identifying, attracting, developing, and retaining talent are significant actions because our people are so important.

is responsible for the accurate collection, handling, and delivery of samples directly from production lines and field sites, strictly following technical protocols, safety standards, and company procedures. The role is primarily field-based, supporting operational excellence and client satisfaction through hands-on activities at client facilities and remote locations.

• Sample Collection & Handling
  • Collect water and hydrocarbon samples from production lines and field sites as per client and company requirements.
  • Label samples with well name, date, and time; ensure all samples are logged and entered into the company database system.
  • Prepare samples for shipment, maintaining chain of custody and compliance with hazardous shipping protocols.
• Field Operations
  • Conduct field analysis and sampling in accordance with Field Services Standard Operating Procedures.
  • Comply with safety regulations of clients and company Health, Safety, and Quality Management Systems.
  • Maintain communication with supervisors regarding incidents, equipment, and sampling activities.
  • Operate field tools as required.
  • Complete all worksheets, data forms, and administrative records legibly and file appropriately.
• Quality & Compliance
  • Perform duties in accordance with approved QA procedures and technical standards (ASTM, UOP, IP, etc.).
  • Contribute to the effectiveness of Management Systems, including performance improvement and reduction of nonconformities.
• Safety & Communication
  • Use appropriate protective equipment and follow all safety signage and protocols.
  • Participate in safety and procedural training sessions as required.
  • Advise supervisor if personnel, equipment, or consumables are insufficient for workload.

• High school diploma required; clean driving license is a pre-requisite.
• No prior experience required, but previous field experience preferred.
• Ability to work outside in all weather conditions and adapt to changing environments.

• Technical Skills: Accuracy, attention to detail, and avoidance of cross-contamination.
• Organization & Planning: Ability to meet routes and schedules, maintain documentation, and manage inventory.
• Communication: Effective verbal and written communication with clients, team members, and supervisors.
• Customer Orientation: Commitment to understanding and meeting customer and stakeholder needs with integrity and safety awareness.
• Teamwork: Cooperate respectfully and transparently to achieve shared objectives.
• Results Orientation: Focus on achieving or exceeding expected results under established quality standards.

• Standing for extended periods; manual handling of sample containers within recommended limits.
• Occasional lifting, repetitive movements (labeling containers), and operation of field equipment.
• Adaptability to weather conditions and changes in the physical environment.

• Safety, efficiency, and physical comfort are prioritized, with appropriate protective equipment and clear signage.
• Functional spaces at client facilities (field) and adequate communication channels.
• Participation in safety and procedural training sessions is required.

Core Laboratories, including all of its affiliated and related entities, is an equal opportunity employer and is committed to creating an inclusive environment for everyone. Employment decisions are made regardless of characteristics including, but not limited to, race, color, sex, sexual orientation, gender identity, national origin, age, disability, religion, genetic information, protected veteran or uniformed service member status, and any other characteristic protected under applicable law.