Oil and Gas

Oil and Gas | Reservoir Engineering

PVT: Concepts, Methods, and Applications

Course Code: N934
Instructors:  Bahman Tohidi
Course Outline:  Download
Format and Duration:
3 days


The course covers reservoir fluid composition, phase behaviour and reservoir fluids classification; PVT tests and correlations/modelling; the evaluation and application of PVT reports; Equation of State tuning, PVT analysis by compositional methods using a compositional behaviour model; applications in reservoir simulation. There will be a discussion of potential causes of errors and several case studies.

Business impact: Participants on this course will add value to their businesses through resource estimation, reservoir simulation, and data-driven decision-making.


A well presented and thorough course on a very theoretical subject.

Duration and Training Method

A classroom course comprising lectures, case studies, exercises, and discussion.

Course Overview

Participants will learn to:

  1. Assess the fundamentals of reservoir fluid composition, phase behaviour, correlations, and classification.
  2. Construct PVT testing requirements.
  3. Appraise PVT analysis by compositional methods.
  4. Prepare the results of PVT analysis for use in reservoir modelling and reservoir engineering studies.
  5. Characterise sources of error and evaluate case studies.

The course aims to address a number of key topics in this area, but there is some flexibility in the formal itinerary depending on the groups preferences. The key topics that are covered include:

  1. Fundamentals - reservoir fluid composition; basic concepts of phase behaviour; classification of reservoir fluids.
  2. PVT tests and correlations - compositional analysis by gas chromatography and distillation; conventional PVT tests.
  3. PVT report - its evaluation, quality control, data processing and application of test results.
  4. Applications in reservoir simulation - pseudo components and grouping; optimum fluid characterisation; tuning equation of state data; generating black oil tables for reservoir simulation.
  5. Causes of errors in PVT modelling, case studies.
  6. Specialised topics and current research topics.

Day 1: PVT in Hydrocarbon Reservoirs

  • Pressure-temperature diagram for pure compounds
  • Critical point; ideal and real gases; corresponding state; acentric factor
  • Phase behaviour of binary and multicomponent systems; phase envelope
  • Classifications of hydrocarbon reservoirs
  • Retrograde condensation, cricondenbar and cricondentherm
  • Effect of composition on phase envelope
  • Behaviour of dry/wet gas, volatile/black oil at reservoir and separator conditions
  • PVT tests for dry/wet gas, black/volatile oil and gas condensate
  • Determining molecular weight of liquid hydrocarbons
  • Constant Composition Expansion (CCE) test; Differential Liberation (DL) test; Separator test; Constant Volume Depletion (CVD) test

Day 2: Fundamentals of Phase Equilibria and Fluid Characterisation

  • Equation of state (EoS) - including Van der Waals EoS, SRK EoS, PR EoS
  • Mixing rules
  • Binary Interaction Parameters
  • Algorithm for computer calculations
  • Distillation
  • Gas chromatography
  • Single carbon number (SCN)
  • Semi-continuous fluid description
  • Calculating physical properties of SCN

Day 3: Using Data in EoS Tuning and Reservoir Simulation

  • Application to reservoir simulation
  • PVT reports
  • Grouping
  • Group Selection, Group Properties
  • Tuning of EoS
  • Generating black oil tables for exporting to reservoir simulators

The course is designed for Petroleum and Production Engineers as well as Geoscientists who need to understand what types of fluid are available and how the results can be used.

Bahman Tohidi

After graduation Tohidi joined National Iranian Oil Company (NIOC) in 1984 where he worked as production engineer as well as university lecturer for seven years.  Bahman Tohidi joined Heriot-Watt University in 1991 and graduated with a PhD in Petroleum Engineering in 1995 with his doctoral work on the phase behaviour of water-hydrocarbon systems and gas hydrates. He started his employment in January 1994 working in both Hydrate and Reservoir Fluids research projects.

His research interests include gas hydrates, flow assurance, phase behaviour and properties of reservoir fluids, and reducing the emission of greenhouse gases.  Currently, he leads both Hydrate and Reservoir Fluids Research Groups at Institute of Petroleum Engineering, Heriot-Watt University.  He is the Director of Centre for Gas Hydrate Research and the newly formed Centre for Flow Assurance Research (C-FAR) at Institute of Petroleum Engineering, Heriot-Watt University with several projects on various aspects of gas hydrates and flow assurance, and phase behaviour and properties of reservoir fluids.  His is a consultant to major oil and service companies.  Bahman is Managing Director of “HYDRAFACT LIMITED” a Heriot-Watt spin-out company with Flow Assurance and PVT as its main area of activity.

His teaching responsibilities include Petroleum Engineering and Production Technology, as well as offering several short courses to the industry (including; Advanced Flow Assurance and Gas Hydrates, PVT and Phase Behaviour of Reservoir Fluids, and Petroleum Engineering for other Disciplines).  He has published more than 160 papers and holds 8 patents mainly in gas hydrates and PVT.

Affiliations and Accreditation
PhD Petroleum Engineering
BSc Abadan Institute of Technology, Iran - Chemical Engineering
SPE Distinguished Lecturer in (2005-2006)
SPE- Member
EPSRC - Peer Review College (2006-2009)
Journal of Chemical Engineering Research and Design (2010-2013)

Courses Taught
N934: PVT


CEU: 2.1 Continuing Education Units
PDH: 21 Professional Development Hours
Certificate: Certificate Issued Upon Completion
RPS is accredited by the International Association for Continuing Education and Training (IACET) and is authorized to issue the IACET CEU. We comply with the ANSI/IACET Standard, which is recognised internationally as a standard of excellence in instructional practices.
We issue a Certificate of Attendance which verifies the number of training hours attended. Our courses are generally accepted by most professional licensing boards/associations towards continuing education credits. Please check with your licensing board to determine if the courses and certificate of attendance meet their specific criteria.