Oil & Gas Disciplines Explained


A Geologist contributes primarily to the identification of leads and prospects for the company's international basins. They provide geological support for the producing fields from time to time. As a Geologist, they are required to perform play analysis, map seismic facies interpretation, sequence stratigraphy, and also evaluate petroleum system. They also generate prospects and develop new ideas including hydrocarbon plays. Also, one should possess good skills in identifying and reviewing geological, geophysical and other relevant data in developing geological models. Apart from conducting pre-drill planning, providing operational support, and undertaking post-drill geological evaluation of exploration drilling campaigns, a geologist also prepares and maintains prospects and leads inventories. In addition, they also prepare reports for each basin and permit area as required including geological risking and resource probabilistic estimations of hydrocarbons in place.
Geologists also play a vital role in providing expert Exploration and appraisal Geological evaluations of assignments with an emphasis on resource assessment and proof of concept for conventional clastic reservoir plays. They need to have thorough knowledge of play and prospect identification, generation and development plus have a practical knowledge of resource estimation and risk analysis. Additional qualities that help to add value to this role are good abilities to drive and deliver projects for the team whilst dealing with a variety of stakeholders and disciplines, including subsurface - drilling and completions. It is paramount that they have strong leadership and mentoring skills which enables good collaboration with various engineering disciplines.

Petrophysicist and Well Site Engineers

Well site engineers and Petrophysicists  help in reviewing the existing processes and strive to improve drilling procedures including implementation of necessary changes. They require extensive seismic interpretation experience like 2D, 3D, structural and stratigraphic interpretation ranging from regional to prospect scale.  They utilize 3D techniques for robust fault mapping, trap mapping and seismic waveform analysis.  Apart from designing well profiles for multiple targets, they also present all work, prospects and proposals to their management, partners, and other stakeholders. Other aspects of this role include providing technical support and oversight for development geophysical studies and be able to mentor junior staff in geophysics.  They are also required to have excellent teamwork, interpersonal and communication skills. Communication includes collaboration within the company, recommendations to senior management and external representation of the company while working with partners and/or government representatives. Most importantly, they dedicate themselves to working at high technical standards, a passion for growth and the ability to form strong relationships with partners.

Completions Engineers

Develop completions basis for design, key design and procedure documents. They also form basis for execution plans and group loadings consistent with local policy and regulatory requirements. They utilize engineering tools and principles to assist in designing various aspects of a well completion. To ensure well objectives are achieved, they provide expert engineering and technology advice. They develop recommendations on equipment, materials specification, procurement and contracting. Other major aspects of this role include monitoring daily completion operations for HSE, cost, efficiency and completion integrity. Preparation of completion & workover programmes and cost estimates are also undertaken.  Mentoring and training  junior engineers is also a part of this role.  Strong interpersonal, team working and communication skills are the essence of this position.

Drilling Engineers

Drilling Engineers provide drilling engineering expertise for the design of exploration, appraisal, development and production wells. They supervise and mentor drilling and well engineers and prepare drilling engineering programs and execution procedures. Apart from assuring compliance with regulatory standards for well construction, they are also responsible for preparation of Government approval documentation. Another important task is to provide drilling engineering support to offshore rig teams and provide input in identifying and evaluating new opportunities. They require to collaborate with other engineering functions to resolve key issues and decisions.

Reservoir Engineer

A reservoir engineer researches, inspects, and evaluates underground oil and gas reserves to determine the most efficient means of extracting resources. He or she typically works on-site at an established well or a new drilling project, analyzing schematics and compounding scientific data. The information gathered is used to develop cheaper, more fruitful collection methods. Most reservoir engineers work for major petroleum corporations, though some are independent contractors or employees of government research or oversight committees.
The daily job tasks of a reservoir engineer can vary depending on the project at hand. If a company plans on starting a new well, the engineer may first consult with surveyors and petroleum geologists to make sure the prospective reserve can supply enough oil or gas to make the job worthwhile. He or she then considers different drilling and extraction methods, and determines which will be the most cost-efficient. The resulting data and ideas are usually presented to supervisors for approval.
Once a project is underway, the reservoir engineer helps to oversee drillers, construction workers, and scientists until completion. The finished well is monitored carefully in the first few days to make sure the amount of oil or gas extracted meets predictions. If problems arise, the engineer reviews schematics and orders repairs or changes to equipment. He or she typically checks on production numbers throughout the drilling phase, which may last months to years, to ensure good results.


Seismologists are Earth  scientists, specialized in geophysics, who study the genesis and the propagation of seismic waves in geological materials. Their research aims at interpreting the geological composition and structures of the Earth. The vast majority of seismologists work in petroleum exploration.
Other seismologists study the seismic waves generated by much more powerful sources: natural, like earthquakes and mining events, or artificial, like underground nuclear tests. The fundamental work of a seismologist is to locate the source, the nature, and the size (magnitude) of these seismic events.
Seismologists work in multidisciplinaryms composed of Earth scientists, technicians and professionals from the fields of computers, physics, electronics, telecommunications and civil engineering. Contacts with emergency organizations are often necessary.

Workover Engineer

The Completion and Workover Engineer monitors completion and workover activities and performs offset well production and completion analyses. Responsibilities include preparing the well proposal and basis of design for new well completions and workover activities and following the technical execution of programs. Make technical completion recommendations to achieve production optimization and also Prepare workover, completion, and recompletion well programs and end-of-well reports. In addition, they take part in well reviews to assist with diagnosis of well performance problem, and recommend programs for improvement or remediation of specific wells. Also, they perform engineering studies to solve recurring issues such as production performance, corrosion, and scale and to monitor well integrity.

Logging (LWD & MWD)

Logging engineers devise methods to improve oil and gas extraction and production and determine the need for new or modified tool designs. They also oversee drilling and offer technical advice. In addition, they assist engineering and other personnel to solve operating problems. They also confer with scientific, engineering, and technical personnel to resolve design, research, and testing problems. They require to direct and monitor the completion and evaluation of wells, well testing, or well surveys and also monitor production rates, and plan rework processes to improve production. Other aspects of this role involve analysing data to recommend placement of wells and supplementary processes to enhance product.

Mud & Pumping Engineers

A mud engineer works on an oil well or gas well drilling rig, and is responsible ensuring the properties of the drilling fluid, also known as drilling mud, are within designed specifications. Mud Engineers determine the Mud so that it meets specific area of requirements. They implement a series of Mud Tests After enrolment of their test results, Mud Engineers write  instructions for crew members so that they may then get started making key Mud treatments. If is necessary, a Mud Engineer might stay onsite to advise the crew members of the oil rigs and supervise methods for treatment.
 Apart from standard responsibilities,  Mud Engineers are also accountable for creating Mud reports, ordering products for any treatments, and keeping field relationships. They have a diversity of responsibilities on the oil rig and hence Mud Engineers are known to experience high levels of  job gratification.

 Cementing & Field Engineer

Cementing Field Engineers deliver engineered solutions designed to ensure that the well is properly stabilized. The Cementing team employs the latest technologies and analytical software to ensure complete and proper cement placement. Cementing Field Engineers perform a variety of other services at the well, including providing technical and operational engineering expertise to external customers in a professional manner, leading the teams in implementing designs at the wellsite and assisting in pre-planning, job execution (at field wellsites onshore or offshore) and post-job analysis. They also interprete real-time wellsite data and work with software simulators and electrical and mechanical devices. In addition, they perform assignments requiring knowledge and application of basic engineering principles for design of work and promote safety awareness and environmental consciousness, and complying with all applicable safety and environmental procedures and regulations according to  Health, Safety and Environmental (HSE) regulations and guidelines.

Well Control Engineer

A well control engineer supervises assigned staff and is responsible for performing calculations and making assessments on well control problems both onsite and from the office.
We are looking for a self-motivated individual that can effectively function as a member of a team, show initiative, and perform other duties as required for the team to be successful. Various tasks of a well control engineer include developing Blowout Contingency Plans, Relief Well Design, and related documents for a variety of customers. They require to travels to customer sites both domestically and internationally to deliver well control support to onshore and offshore locations. They also perform well control audits and conduct well control training on the job and in a classroom environment. Another task related to this role is to provide engineering support to field operations and assist with manual equipment setup and operation as required. Well control engineers also maintain appropriate reports and documentation of well site activities and periodically provide technical support on location to meets customer requirements. They also frequently advise staff and customers on equipment capabilities and keep management informed of significant problems. In addition to complying  with safety regulations, they provides assistance with or take the lead on activities such as:HAZID / HAZOP,Urban Risk Assessment, Emergency Response Planning, Emergency Response Drills, Blowout Contingency Planning and other duties as assigned or required.

Well Test Engineer

The Well Test Engineer forms part of a team that is responsible and accountable for all aspects of Well Test operations and activities covering planning, equipment, personnel and third party equipment. They are primarily responsible for supporting the day to day Well Intervention Operations and planning routine Well Test Programmes in line with company, safety and industry standards. They also ensure data is collected accurately and presented professionally to achieve a high quality report for the client. A well testing engineer is also required to liaise with Operations Supervisor (Onshore) to ensure they are fully aware of offshore/onshore operations. They also involve in compiling end of job report to required standard in a timely and efficient manner. In addition, they attends pre and post test Client meetings when required. Well testing engineers frequently assist in the onshore base, creating reports, packing kits etc. and actively participate in and promote company health and safety campaigns, policies and procedures.

 Wireline & Perforations Engineer

Wireline and Perforating Field Engineers use electronic tools and computerized surface systems at the wellsite to perform openhole, borehole seismic, and cased-hole logging to record and analyze subsurface formations in oil and gas wells. They also perform perforating services to facilitate the flow of oil and gas from the well. They are also required to perform Data acquisition and presentation. They help in development of client relationships and ensure work is carried out in a safe and timely manner.

Fracture Engineer

The Fracturing Engineer is responsible for providing overall technical and engineering management for the fracturing stimulation job and ensuring client's requirements are met. Specifically, their  duties include provision of technical and engineering management for the fracturing operation and organization and verification of all materials and equipment are at job site. They also prepare report, analyse and write recommendations. Fracture engineers also conduct control tests to ensure proper deliver of service and assist sales as needed to gather, analyze and report technical information. They are also required to comply with all government, industry and company regulations and standards to ensure a healthy and safety work environment and well as reduce environmental impact.

Well Intervention Engineer

In this role, you’ll be responsible for defining the control criteria and developing, evaluating and designing completions for both new wells and wells requiring intervention. You’ll determine the operating envelope and deliver solutions optimised for corrosion control and lifecycle integrity. You’ll also provide technical advice and detailed completion programmes to well-site personnel comprising appropriate hardware, fluids, services and procedures required for all completions.
In addition, you may be required to spend time at the well-site supporting field staff and ensuring operations are performed in full compliance with company procedures, policies and guidelines. You may also be called upon to help-out with ‘non-rig’ activities including coiled-tubing, slick-line or electric line operations.

Field Services Engineer

A field service engineer conducts inspection of assembled equipment, to ensure proper installation. And also inspects all operating parts to ensure proper operation within expected tolerances. They tune and troubleshoot equipment for proper operation and interact with internal and external project managers during field projects. Also, They require to professionally interact with customer, regarding status of commissioning, on a daily basis. They help in  determining tools and equipment required to perform scope of job and perform routine maintenance on equipment, and assist in establishing preventative maintenance schedules with customer. In addition, they assemble, align, and install equipment as necessary.

Operation Engineer

Operations engineers are responsible for ensuring that their client's manufacturing systems work properly, that they comply with safety regulations, and meet the specifications provided by senior management. They also provide maintenance and support services and troubleshoot any problems that arise with manufacturing. Operations engineers can also assist management in improving the quality of their products and reducing production costs. They typically inspect and review operating activities and determine production schedules. An operations engineer also provides a multitude of services within either the construction or technological industry. These services can include maintenance, staff training, and investigations to determine the cause of defects.  Operations engineers often specialize in a particular discipline, which can require additional training.