Analysis and interpretation of well test

RN-VEGA provides all stages of well testing: design, data loading and preprocessing, interpretation using forward and inverse modeling, report generation.

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RN-VEGA - Analysis and interpretation of well test

Well testing methods



Well testing tools


Physical and mathematical model

A huge library of numerical and analytical flow models for various well completions, boundary configurations and formation structure is available in RN-VEGA.

Physical and mathematical models are based on the functions of point sources - Green's functions of the non-stationary piezoconductivity equation.

Well models

Well models

  • Vertical (full or partial completion of the formation)
  • Vertical with hydraulic fracturing (full or partial completion of the formation)
  • Horizontal
  • Horizontal with multi-stage hydraulic fractures of random orientation
  • Multilateral well
  • Slanted well
Wellbore storage models

Wellbore storage models

  • Constant
  • Changing
    • Hegeman
    • Fair
    • «Spivey packer» (leaky packer / high permeability layer of limited areal extent)
    • «Spivey fissures» (natural fractures / high permeability channel of limited extent )
Reservoir models

Reservoir models

  • Homogeneous
  • Dual permeability
  • Dual porosity:
    • Pseudo steady state (Warren-Root)
    • Slab (Kazemi)
    • Sphere (DeSwaan)
  • Composite
    • Radial composite
    • Linear composite
Boundary models

Boundary models

  • Infinite
  • Single
  • Parallel
  • Circular
  • Rectangular
  • Intersecting

Standard well test analysis process

Pressure transient analysis

Pressure transient analysis

  • Importing flow rate and pressure data;
  • Synchronization of flow rate and pressure data (if necessary);
  • Setting PVT-properties of fluid and rock;
  • Well design specification;
  • Recalculation of pressure to the required depth (if necessary);
  • Creation of pressure buildup curve analysis;
  • Pressure curve simulation;
  • Solution of the inverse problem;
  • Reservoir pressure assessment;
  • Report exporting.

Additionally:

  • Interpretation of deconvolution curves;
  • Creating a flexible plot and IPR;
  • Sensitivity analysis.
Inflow performance relationship

Inflow performance relationship

  • Importing flow rate and pressure data;
  • Synchronization of flow rate and pressure data (if necessary);
  • Recalculation of pressure to the required depth (if necessary);
  • Inflow performance relationship curve analysis;
  • Setting auto-selection of points for creating inflow performance relationship curve;
  • Setting inflow performance relationship curve modes;
  • Assessment of the obtained reservoir pressure parameters, injection-induced fracture closure pressure and productivity/injectivity index.

Additionally:

  • Recalculation of reservoir pressure from radius of investigation to the specified supply contour radius.
Rate transient analysis

Rate transient analysis

  • Importing flow rate and pressure data;
  • Synchronization of flow rate and pressure data (if necessary);
  • Setting PVT-properties of fluid and rock;
  • Specifying well design;
  • Recalculation of pressure to the required depth (if necessary);
  • Decline curve analysis;
  • Modeling of pressure, flow rate and cumulative production curves;
  • Solution of the inverse problem;
  • Report exporting.

Additionally:

  • Production forecast;
  • Estimation of fracture individual parameters taking into account PLT for horizontal wells with multi-stage hydraulic fracturing.

Wellbore pressure calculation methods

RN-VEGA allows simulating the flow for the combination of four fluid types (oil, water, gas, condensate) and includes the following multiphase flow models for calculating the pressure gradient in the wellbore:

  • single-phase model (liquid/gas);
  • single-phase model (Adamov's formula);
  • one-speed model (no phase slip);
  • Ansari model;
  • Beggs-Brill model;
  • Gray model;
  • Hasan-Kabir model;
  • Orkiszewski model;
  • Zhang model;
  • modified models for gas wells with high water gas ratio (WOR).

The speed of sound simulation in the well annulus

The physical and mathematical model takes into account:

  • annular gas pressure and temperature change with depth;
  • annular gas component composition change with depth;
  • phase transitions.

Functionality allows:

  • estimating the average speed of sound in the well annulus;
  • plotting dependences of the average value of sound speed on pressure and temperature in the annulus.

RN-VEGA benefits


System requirements

  • Operation system: Windows 10 64-bit or later, support for OpenGL 3.3 or later;
  • Intel Core i5/AMD Ryzen 5 processor of any generation or equivalent;
  • Recommended amount of RAM: at least 4 GB;
  • Drive: HDD with a capacity of at least 500 GB;
  • Graphics card: Intel HD Graphics or equivalent with support for OpenGL 3.3.

Plans for further development

  • Expanding well model list:

    • Selective-perforated horizontal;
    • Horizontal with inflow control device;
    • Vertical with hydraulic fracturing of variable final conductivity;
    • Multi-segmented.

  • Expanding the list of boundary models:

    • Single partially permeable;
    • Equiangular triangle.

  • Expanding the list of algorithms for pressure conversion along the wellbore:

    • Natural flow;
    • Multiple completion.

  • Automatic data preprocessing followed by automatic interpretation

  • Expanding of gas-dynamics research models

Who uses

  • RN-VEGA software package is used by specialists of PJSC NK Rosneft (200+ licenses);
  • 3000+ well testings are performed annually by using RN-VEGA;
  • RN-VEGA is thebasic tool for teaching oil and gas students in the country's largest universities.