Drilling Risk Management

We implemented:

• calculation of model properties by facies with / without zones;
• methods for assessing the physical and mechanical properties of rocks according to well log and mud logs.

We added:

• taking into account bedding planes while calculating critical densities;
• fracture reactivation simulation.

We added:

• an output of friction angle for each given Mohr circle to the strength certificate;
• the ability to display the depth axis on the log plot with the time axis;
• the ability to set input parameters from the keyboard at the selected depth in the stereogram window;
• taking into account osmotic stresses in the calculation of critical densities.

We added:

• new icons and a dark theme option;
• filters by zones and lithotypes, display of the trend line equation to the cross-plot window;
• "Create by Template" option to the log plot;
• sorting and searching for deleted objects in the WITSML client.

We added:

• several curves from different wells to histogram window;
• filters by zones and lithotypes;
• Pressure-Gradient, Gradient-Pressure converters to the tools.

We added:

• the tree with data update settings to the online maintenance module to select a method for updating and installing the workflow;
• preview to online tracking module.

Besides:

• the online tracking module implements the loading of time-dependent data;
• User Guide is updated.

We implemented:

• online drilling support module;
• loading, storage and display of mud log data, sludge traces.

Besides, the graph for drilling data has been modified: curves can be placed on separate tracks as on the log plot.

New improvements:

• in the correlation editor variable names are checked for compliance with Python language rules;
• the ability to load point data into a separate project element is added;
• equivalent circulating density (ECD) curve and synthetic caliper curve are synchronized.

We improved:

• the inclination and azimuth dependencies of critical densities;
• the crosshole property transfer module.

Besides, the correlation library is complemented.

New improvements:

• wellbore stability analysis with account of strength anisotropy is introduced;
• project well property transfer with account of several reference wells is implemented;
• well data and geomechanical model export to RN-GRID is added.

We introduced:

• recovering horizontal deformations method using well imaging data;
• a new pore pressure calculating method using point data of fluid density changes with depth;

Besides, new petroelastic modeling methods are expanded.

New improvements:

• saving and display options for cross-plot and histogram objects are expanded;
• equivalent circulating density (ECD) profile now can be edited using context menu option;
• variables in log calculator now can be renamed.

New improvements:

• the inclination and azimuth dependencies of critical densities are introduced;
• the depth for stress diagrams and density stereograms now can be set interactively using 3D well trajectory window;
• the correlation library is complemented.

New improvements:

• all functions from pandas, scipy and numpy libraries can now be used under 'pd', 'sp', and 'np' aliases in well log calculator and correlation editor;
• type and measurement units now can be corrected for loaded well log curve;
• logical operations description is added to the correlation editor.

Density curve is the basis for recovering a lot of reservoir parameters. The main source of information on rock density is density gamma-gamma-ray logging. This kind of logging cannot be held in the conductor area thus its log requires a recovery procedure up to the surface.

Geostatic pressure is the pressure of overlying rocks. The geostatic load is equivalent to the weight of the overlying stratum of sediments (rocks and fluids) at any point in the earth's crust and can be determined using density log recovered up to the surface.

Pore pressure is the fluid pressure in rock pores. Methods for determining pore pressure are hydrostatic pressure calculation, Eaton and Bowers methods with clay line determination, and also method using given pore pressure gradient.

A saturated porous medium can be characterized by three elastic moduli: Young's module, Poisson's ratio, and poroelasticity coefficient. Dynamic elastic moduli can be used to recover static ones.

Strength characteristics are parameters determining the critical loads , the excess of which leads to the material destruction. Three main parameters can be measured: uniaxial compression strength, tensile strength and internal friction angle.

Horizontal stresses are lateral stresses that arise in a rock under the rock pressure and tectonic forces influence. The main method of determination is direct calculation using function of rock and pore pressure and tectonic deformation values.

Safe Mud Density Window is the equivalent circulating density (ECD) range that guarantees the absence of critically dangerous incidents during well drilling operation, e.g. reservoir fluid inflow, borehole collapse, drilling mud loss and long crack formation.

As a result of training, the course participants get knowledge about the subject and task of geomechanics in the drilling wellbore processes and skills of work with RN-SIGMA software.

The target audience of this course includes specialists in drilling planning and tracking, geomechanics and related fields.

Lecture on the theory of geomechanics with practical examples (3.5 + 3.5 hours).

Lecture on principles and general approaches to the construction of one-dimensional geomechanical models (2 hours).

Acquaintance with RN-SIGMA, work with tools (1.5 hours).

An example of building a one-dimensional model of wellbore stability (3.5 hours).

Independent work with a ready-made sample of data, or with examples of participants (5 hours).

Examples of working with auxiliary modules (2 hours).

We have conducted 9 trainings in Ufa, Moscow and Tyumen in 2 years. More than 100 participants attended our training courses.