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E-335C - Advanced Well Test Analysis

5 days GRE/ADVWELLTEST
Level
Advanced
Audience
  • Reservoir and production engineers with practical experience in well test analysis.

Purpose
  • To provide an extensive and practical knowledge in design and analysis of well tests aimed at evaluating well productivity and reservoir parameters in the best technical and economical way; the training will focus on data acquired from various well completions, homogeneous and heterogeneous reservoirs, gas shale reservoir, as well as testing various production fluids, oil, gas, heavy oil and gas condensate
Learning Objectives
  • To describe practical and advanced well test analysis methods and their applications
  • To discuss application of results derived from Well Test Analysis in geosciences and reservoir engineering, especially integration of well test analysis results within geological and geophysical models
  • To perform design and analysis of pressure data acquired in wells completed in heterogeneous reservoirs
  • To perform design and analysis of pressure data acquired in water, polymers or steam injector wells
  • To discuss benefits and limitations of well test analysis applied to non-conventional reservoirs
Prerequisite
  • Basic Well Test Analysis knowledge is recommended
Ways and means
  • Interactive courses and exercises
  • Hands-on practice using state-of-the-art software (SAPHIR™)
  • Workshop using real field case data

Overview of well test analysis 1 day
  • Well testing definition and applications, DST and rig less testing
  • Well Test Analysis. Overview of learning methodology
  • Diffusivity Equation. Homogeneous reservoirs. Analytical and numerical methods
  • Types of flow regimes. Radial, pseudo radial, pseudo-steady state and steady state flow
  • Pressure derivative
  • Wellbore storage and skin effect
  • Drawdown and buildup pressure analysis. Superposition principle
  • Average reservoir pressure determination. Interference testing
  • Deconvolution method
Heterogeneous reservoirs testing 0.5 day
  • Reservoir discontinuities. Sealing and conductive fault, intersecting and parallel faults
  • Multilayered reservoirs, with and without cross flow
  • Radial and linear composite systems
  • Two porosity reservoirs. Pseudo steady state and transient interporosity flow
  • Two layers reservoirs
  • Field cases examples
Gas wells testing 0.5 day
  • Solution to the diffusivity equation for gas
  • Gas pseudo pressure and rate dependent skin
  • Gas well deliverability – AOFP
  • Back pressure tests: flow after flow, isochronal and modified isochronal test
  • Testing of dry gas, wet gas and gas condensate reservoirs
  • Field cases examples
Stimulated wells testing 0.5 day
  • Infinite and finite conductivity fracture models
  • Linear and bilinear flow
  • Time to reach radial and pseudo steady state flow regimes
  • Wellbore storage effect and fracture skin
  • Determination of half-fracture length and fracture conductivity
  • Horizontal and fractured horizontal well
  • Field cases examples
Injection well testing 0.5 day
  • Secondary recovery and EOR processes
  • Oil and water banks. Mobility
  • Injection and fall off testing. Interpretation models
  • Water and steam front determination
  • Average Injection Pressure determination
  • Field cases examples
Gas shale reservoirs testing 0.5 day
  • Modeling fluid flow behavior in unconventional reservoirs
  • Gas Shale and Coal Bed Methane (CBM) reservoirs
  • Mini frac (DFIT) interpretation
  • Pressure Transient Analysis applicable to horizontally multi fractured wells
  • Stimulated Reservoir Volume (SRV) determination
  • Time to reach fractures interference
  • Wells interference due to frac operations
  • Effect of pressure-dependent rock properties on permeability
  • Field cases examples
Well test design 0.5 day
  • Test design methodology according to reservoir evaluation objectives
  • Common test string configurations. DST and rig less testing
  • Elaboration of testing program and contingencies
  • Real time vs. memory data acquisition
  • Pressure gauges: resolution, specifications and acquired pressure data quality control
  • Offshore wells testing
  • Reservoir and well candidates for test design
  • Field cases examples
Workshop 1 day
  • Interpretation of real data acquired in fields of interest using state of the art software
  • Both analytical and numerical methods will be applied
  • Test design scenarios for both homogeneous and heterogeneous reservoirs including expected boundary conditions according to geological model