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E-518 - Gas Cycling: an Integrated Approach

  • Production or petroleum engineers involved in operating or designing Oil & Gas field processing facilities.
  • This course provides participants with an integrated approach of gas cycling, from the reservoir to the surface facilities.
Learning Objectives
  • Upon completion of the course, participants will be able to:
  • list main characteristics of Oil & Gas well effluents,
  • identify key field and reservoir parameters,
  • choose a gas cycling strategy,
  • evaluate reservoir performances and recovery factor,
  • specify quality and flowrate needed for gas re-injection,
  • assess key parameters for surface facilities design as needed for gas re-injection.
  • No prerequisites for this course.
Ways and means
  • Highly interactive training with industry specialist lecturers.
  • Methodology illustrated by multiple industrial case studies.

Gas cycling 0.5 day
  • Introduction.
  • The integrated gas cycle: elements, configuration, challenges.
  • Gas cycling for pressure maintenance.
  • Gas cycling for miscible gas displacement (EOR): sweeping and soaking, compositional effects.
  • Dry gas cycling in retrograde condensate reservoirs.
  • Cycling non-hydrocarbon gases.
  • Major issues and constraints: reservoir, wells, flow lines and surface facilities.
Well effluent behavior 0.5 day
  • Different types of well effluent. Main characterization parameters.
  • Constituents that pose problems for storage and transport.
  • Gas composition: rich and lean gas, sweet and sour gas.
  • Gas PVT behavior.
  • PVT properties of pure components and mixtures.
Reservoir fluid behavior & needs for gas cycling 0.5 day
  • Phase envelop, reservoir and surface PVT issues.
  • Ternary diagram, first contact miscibility, multiple contact miscibility: condensing drive and vaporizing drive,minimum miscibility pressure (MMP).
  • Specificities of condensate gas: retrograde region.
Reservoir aspects 0.5 day
  • Reservoir performance.
  • Drive mechanisms: gas reservoirs, gas cap, gravity drainage displacement, tertiary gas displacement, miscible gas displacement.
  • Requirements for gas quality for injection, flowrate, cycling rate and configuration of injection.
  • Field development: architecture and phasing.
Introduction to surface facilities design 0.25 day
  • Gas specifications to conform with gas cycling (dew point, sulfur removal & valorization).
  • Field processing of gas effluents for gas cycling.
Gas dehydration & sweetening 0.25 day
  • Moisture content of natural gas.
  • Gas dehydration processes.
  • Gas sweetening, acid gases disposal.
Condensate: recovery, stabilization & monetization 0.5 day
  • Low-temperature separation techniques.
  • Condensate stabilization.
  • Monetization routes.
Gas compression 0.25 day
  • Multi-stage compression: design criteria.
  • Gas compression versus field aging: effect on operating parameters, needs for booster station.
Compressors & drivers 0.5 day
  • Compressors technology: choice criteria, effect of gas density evolution.
  • Compressor drivers.
Injection network 0.25 day
  • Network architecture.
  • Network operations, backpressure management.
  • Well performance issues.
Case study: synthesis – Wrap up 1 day
  • Field monitoring, adaptation of surface facilities to field aging, re-injection rate versus surface production capacities and effect on recovery, re-injection rate versus gas sales and effects on reservoir monitoring.