Mudloggers play a vital role in the drilling of oil and gas by gathering information from rock samples, circulated to the surface in drilling mud

As a mudlogger, you'll monitor and record drilling activity, providing information to the drilling team about the status of a well during the extraction of oil or gas. The data you collect and monitor (mud log), influences important decisions about the efficiency and placement of well sites.

You'll use a range of equipment and laboratory techniques, such as binocular microscopes, ultraviolet fluorescence and thin-section analysis, to create mud logs showing a geological record of the site being drilled.

Mudloggers are also sometimes known as logging geologists, mudlogging geologists or mudlogging technicians. The term mudlogging is also known as hydrocarbon well logging.

Types of mudlogging data

Drilling parameters that are monitored include:

  • speed of rotation
  • rate of penetration
  • oil and gas shows (whether oil or gas is present)
  • pit levels
  • cutting rate
  • mud-flow rate.

You'll also ensure that accurate samples are taken at the right intervals and that any issues encountered during the drilling are recorded.


As a mudlogger, you'll need to:

  • work in wellsite units collecting, processing, recording data in a well log and describing rock samples
  • use various laboratory techniques to analyse samples
  • monitor computer recordings of drillings
  • interpret information and feed it back to the data engineer and drilling team to enhance safety and success
  • operate and maintain a real-time computer-based data acquisition system, which records all aspects of rig activity
  • undertake on-site maintenance when necessary
  • take on the primary health and safety role for the well through constant monitoring of all critical drilling parameters
  • predict dangerous situations, such as over-pressured formations
  • assist the wellsite geologist during coring operations
  • provide written reports to the data engineer, drilling team and company.


  • Pay for mudloggers during training is usually modest until training is completed, when a typical starting salary is roughly £25,000 to £30,000.
  • Once you've built up experience as a mudlogger, you can expect to earn around £45,000, and may even be able to reach a salary of £70,000.

Benefits usually include free accommodation, food and travel when you're working away from home. Hardship posts may attract a premium.

Multinational service companies tend to offer the best pay, working conditions and opportunities for progression.

Income figures are intended as a guide only.

Working hours

Mudloggers usually work 12 hours a day, seven days a week, spending two weeks offshore on the rig and two weeks at home. Sometimes you may need to work for four weeks at a time.

What to expect

  • Work is usually in teams of four, based in units or self-contained laboratories, which are the safest and most comfortable working areas on the rig.
  • Work is mainly carried out offshore (with free accommodation, meals and recreational facilities) and you'll most likely be contracted to an oil company via a service company. Less commonly, you could work in water well and mineral exploration.
  • Jobs are available in restricted locations. The nearest opportunities are with North Sea oil rigs. Work in the Middle East, Africa and other regions is also possible.
  • The oilfield has a broad mix of cultures and backgrounds and creates intense physical and mental pressures. Consider how you feel about living in close quarters with others for long periods of time or spending long periods away from family and friends.
  • Self-employment or freelance work is possible on a short-term contract basis and is usually obtained via contracting companies.


Most mudloggers have a degree in geology, but other relevant degree subjects include physical, mathematical or applied science and engineering. Joint degrees with geology are also acceptable.

In particular, the following subjects may be helpful:

  • applied physics
  • chemistry
  • geochemistry
  • geophysics or geotechnology
  • mineral, mining or petroleum engineering
  • petroleum geology
  • physics.

The minimum entry requirement is usually a degree as it provides the necessary scientific understanding. However, HNDs in geology or similar subjects are accepted by some companies, particularly if coupled with significant relevant practical experience.

You won't need a pre-entry postgraduate qualification.

However, you will need a good level of health and fitness, and this will be assessed by a medic to ensure you meet international standards.


You'll need to have:

  • good computer skills and the ability to work with sophisticated technology
  • the ability to absorb a range of technical information in areas such as geology, chemistry, mechanics, electricity, electronics and computer science
  • strong mathematical skills
  • analytical and critical thinking
  • decision-making ability
  • excellent interpersonal and communication skills
  • the ability to work both independently with minimal supervision and as part of a team
  • the ability to cope with the challenging working environment of the oil industry.

English is the generally accepted international language of the oil business. However, skills in other languages (principally French and German) can be useful.

Work experience

While pre-entry experience is not essential, vacation work and practical experience in the industry will improve your chances of finding employment.

Find out more about the different kinds of work experience and internships that are available.


The business of exploration and extraction is international and many of the jobs are based overseas. Major employers recruit internationally with many applicants coming from the United States and Europe, so UK graduates are competing with nationals of other countries.

Smaller mudlogging companies may recruit globally, although there's a tendency to recruit locally where possible.

When there is a demand for oil exploration, vacancies for mudloggers are correspondingly high and you may be able to find work anywhere in the world. However, the oil industry is strongly affected by economic trends.

When work is plentiful the major employers often welcome speculative applications. Some advertise on graduate recruitment websites. Recruitment can vary between no positions advertised at all, to hundreds available in any one year.

Recruitment, training patterns and job titles vary from company to company in the extraction phase. Some employers choose not to distinguish at entry-level, between petroleum, drilling and support engineering. Instead, preferring to recruit people with wide potential and deploy them after training into roles that suit both individual and company needs.

Look for job vacancies at:

Professional development

Training varies from company to company but will almost certainly involve a course in general oil well drilling. This will cover:

  • drilling equipment and techniques
  • training in the physics and mechanics of oil-bearing rocks
  • downhole pressure and its corresponding effects on the safety of the well.

Training in computer systems is normally carried out on the job.

There's no professional accreditation associated with mudlogging. It sometimes leads on to more senior work in the oil industry, for which professional institution accreditation does exist.

Safety and survival training is obligatory and varies depending on location. To work in UK waters, you'll need to obtain a BOSIET (Basic Offshore Safety Induction and Emergency Training) certificate. This usually takes three days to complete and is valid for four years.

The course covers basic knowledge of safety and emergency procedures when working offshore and travelling by helicopter. Subsequent refresher courses are mandatory.

More information on training in the oil and gas industry can be found at OPITO. The Energy Institute also offers relevant training programmes - for more information, see Energy Institute - Training.

Career prospects

Mudlogging is sometimes seen as an entry point into the industry and regarded as an ideal position from which to gain knowledge and observe the practices and operation of an oil rig. However, some companies employ senior mudloggers who have been in the profession for years. Larger multinational companies tend to offer better conditions and opportunities to progress.

Some mudloggers move on to the role of data engineer or crew chief, which is a senior member of the mudlogging crew. Mudloggers typically serve two to three years before being promoted to this role.

There are opportunities to then specialise in roles such as pressure analyst, flow detection specialist, hole stability engineer or wellsite geologist.

Occasionally, mudloggers enter areas such as human resources and marketing in the oil industry.

How would you rate this page?

On a scale where 1 is dislike and 5 is like

success feedback

Thank you for rating the page