D444 Development Planning For Mature Fields

Event Facts

  • 15 Nov. 2021
  • 16 Nov. 2021
  • 17 Nov. 2021
  • 18 Nov. 2021
  • 19 Nov. 2021
Half-day sessions, starting in the mornings for the Americas and afternoons for Europe, Africa and Middle East. Any variation to this will be communicated in advance.
Event Code:
5 sessions
Mark Cook, Mark Bentley
Booking Status:
Good Availability
GBP £2,245 (Exclusive of tax)

Course Facts

Course Code:
3 days
Virtual Classroom
3.2 Continuing Education Units
32 Professional Development Hours
Certificate Issued Upon Completion


Business Impact: This course equips participants with the knowledge and decision-making skills to create a robust development plan for mature fields.

This multidisciplinary course is designed to give participants a broad appreciation of the evaluation and planning activities associated with incremental development planning. This course takes groups through a wide range of associated issues, fills any knowledge gaps in the essential technical fundamentals required for mature field development planning and uses a case-based exercise which will run through the whole course.

Duration and Training Method

A virtual classroom course divided into 5 webinar sessions, comprising lectures, discussion, case studies, and practical exercises to be completed by participants during and between sessions.

Participants will learn to:
  1. Characterise the overall challenges associated with mature field developments.
  2. Evaluate critical insights from subsurface data and apply this to modelling options and recovery methods.
  3. Assess associated well data, typical late life issues and drilling and completion options for mature developments.
  4. Manage the role of risk and uncertainty when making mature field development planning decisions.
  5. Prepare a strategy and implementation plan.
Mature fields differ from greenfield developments in that major infrastructure is in place, static reservoir data has accumulated from development drilling and a growing volume of production data has become available. Decisions therefore relate to incremental projects, which may be small in scope and are often economically marginal. A firm understanding of the technical fundamentals associated with reservoir, wells and surface facilities is therefore required to make quality decisions in this environment, supported by an understanding of incremental project economics.

Challenges of mature field developments

  • Open discussion covering smaller target sizes, costs, efficiencies, perceptions

Mature field development strategies

  • What is strategy? The difference between green and brownfield decision making
  • Framework (choices, boundaries, selection criteria, framing decisions)
  • Evaluation methods
  • Workflows, overview of tools

Mature oil fields

  • Subsurface: getting insights from data (surveillance mapping), recovery mechanisms, modelling options (analytical, sector, full field), history matching, EOR
  • Wells: understanding well data, typical late life issues (flow assurance), drilling and completion options (including workovers)
  • Surface: understanding surface data (including allocation), surface options e.g. debottlenecking

Mature gas fields

  • Subsurface: insights from data, modelling options, gas condensate issues e.g. condensate banking
  • Wells: gas issues e.g. liquid loading
  • Surface: gas issues e.g. late life compression


  • Typical economic decision making criteria
  • The importance and pitfalls of incremental economics
  • Finding the optimal development strategy

Decision making

  • Evaluation methods
  • Dealing with risk and uncertainty
  • Biases in decision making
  • How to make the best decision

Implementing and development managing the selected plan

  • Building the plan
  • Managing the plan when it goes off track


Who should attend

The course is designed for mid-career subsurface professionals, specifically petroleum engineers and geoscientists who play a part in evaluating, screening and maturing oil and gas field development opportunities in mature fields. Participation would also benefit technical team leaders and managers who want to gain an insight into the challenges, uncertainties and preparations involved in development planning for mature fields.

Prerequisites and linking courses

There are no formal prerequisites for this course. This course is complimentary to other courses in the Nautilus Training Alliance programme focusing more generally on economics and risk including N014 (Petroleum Economics and Risk Analysis).




Mark Cook


Mark Cook is Principal Reservoir Engineer for TRACS International. His specialties are reservoir engineering, petroleum economics, and risk analysis, subjects in which he has developed and delivers training courses. Mark has worked in the oil and gas industry since 1981, spending the first eleven years with Shell International as a reservoir engineer. He then co-founded TRACS International in 1992, setting out to provide training and consultancy to the upstream industry. He built the business over time as Petroleum Engineer and Director, before taking on his current part-time role as Principal Reservoir Engineer.

Affiliations and Accreditation
MBA, Henley Management College
BSc, University of Nottingham, Chemical Engineering

Courses Taught
N006: An Introduction to Reservoir Engineering for Geoscientists
N014: Petroleum Economics and Risk Analysis
D006: An Introduction to Reservoir Engineering for Geoscientists (Distance Learning)
D014: Petroleum Economics and Risk Analysis (Distance Learning)
N444: Development Planning For Mature Fields

Mark Bentley

Mark has 33 years industry experience, initially as a production geologist with Shell, working in the UK, Oman and the Netherlands and subsequently training and consulting with TRACS. He has spent most of his career working in integrated study teams on a wide variety of reservoir assets. His specialist fields of expertise are 3D reservoir modeling and scenario-based approaches to handling subsurface uncertainty and risk. He publishes widely on the topic and co-authored the reference text 'Reservoir Model Design' with Phil Ringrose.

In addition to his role as Training Director at AGR TRACS, he is also an Associate Professor in the Institute of GeoEnergy Engineering at Heriot-Watt University, holding a Chair in the field of Mature Field Management.

Affiliations and Accreditation
PhD University College of Wales, (Aberystwyth) - Structural Geology
BSc University College of Wales, (Aberystwyth) - Geology
Fellow of the Geological Society, London
Fellow of the Society of Petroleum Engineers
EAGE Member

Courses Taught
N033:  Characterisation, Modelling, Simulation and Development Planning in Deepwater Clastic Reservoirs (Tabernas, Spain)
N106:  Advanced Reservoir Modelling (Elgin, Scotland)
N310:  Carbonate Reservoir Modelling and Field Development Planning (Provence, France)
N356:  Production Geoscience (Pembrokeshire, UK)
N386:  Reservoir Model Design (Pembrokeshire, UK)
N427:  Reservoir Model Design, classroom based
N431:  Reservoir Modelling of Deepwater Clastic Systems (Gres d’Annot, SE France)
D427:  Reservoir Model Design (Distance Learning)
N444:  Development Planning For Mature Fields

Alternative Dates for this Course

Related Subjects

"Very well presented and organized course, covering important topics from strategy to probability, economics and planning in a redevelopment project, and more importantly how to work as a team."