Complex analytics

Complex analytics implies special services including pressure transient analysis, interference analysis and isobar mapping.

The result of the work is detailed maps with the analysis of object energy state time history and reports with thoroughly processed initial data.

Such reports allow making strategic decisions about development of an object under study and meticulous planning of further activities.

Isobar map

Goals and objectives:

estimation of energy state of productive formation;
history monitoring of weighted average reservoir pressure;
calculation of reserve recovery of different croppings;
waterflooding system effectiveness evaluation;
potential assessment of different croppings for further development;

There are different mapping techniques

Material balance method based on using material-balance equation for pressure calculation in non tested wells.
Conventional method based on various interpolation forms of limited number of measurements.

The range of results application:

optimization performance of waterflooding system;
well intervention designing;
revision of key well testing network.

For isobar mapping the following results of pressure measurements are used: indirect calculation of statistic levels detection with wellhead echometers, direct single measurement of bottomhole pressure, reservoir pressure according to the long-term well testing results.

Main types of interpolation:

Inverse Distance Weights (IDW) – calculates the value of cells using the average from the sum of measurement point values which are located in close proximity to every cell. The nearer the point to the center of estimated cell is, the more weight or influence its value has in the average computational process;
spline interpolation is calculation of cells value based on mathematical function, minimizing surface curvature, calculating the most flat surface, passing through all measurement points;
kriging - average weighted mapping technique which uses variogram as a weight function;
SIAM Company has considerable experience of isobar mapping for a lot of subsoil users including.

SIAM Company has considerable experience of isobar mapping for a lot of subsoil users including OJSC Tomskgazprom VNK, OJSC Orenburgneft, LLC RN-Yuganskneftegaz, LLC RN-Stavropolneftegaz, OJSC Samaraneftegaz and others.
Mapping is done mostly using «RN-KIN» software based on a compatible field database of clients.

Interference test based on correlated data examination

Interference analysis based on correlated data examination is a complex project to detect the presence or absence of pressure communication, to calculate response time for producing wells on changes in injection wells performance, and to assess contributions of injection wells to producer recovery rate of a development target, using alternative methods of field data analysis.

Goals and objectives:

estimation of pressure communication between couples producing-injection wells based on correlation analysis;
calculation of response time for producing wells on changes in injection well performance;
assessment of contributions of injection wells taking part in cyclic waterflooding to adjacent producing wells performance;
assessment of cycling waterflooding efficiency.

The range of results application:

optimisation of well intervention designing frequency;
updating and reservoir characterization;
updating and revision of hydrodynamic reservoir model;
revision of field development programme;

Distinctive features:

alternative methods of interference analysis are cost-efficient as there are almost no operational costs;
recovery growth due to cycling waterflooding efficiency;
Initial data are only production/injectivity rate data of a development target;

Complex analysis of PTA

Complex analysis of PTA is a tool which allows generalizing data obtained on the results of PTA, checking its accuracy and consistency, weighing negative impacts, making recommendations and programming well testing. Besides that, individual tasks may be fulfilled depending on development target features and project aims.

Goals and objectives:

general statistics gathering on the results of performed PTA;
assessment of fidelity for obtained information, criteria development;
identification of negative impacts on well testing quality, working out solutions to their minimizing;
development of a well testing programme;
mapping based on different reservoir characteristics (pressure, permeability etc.) using conventional and alternative proprietary methods.

The range of results application:

optimisation of well intervention designing frequency;
updating and reservoir characterization;
updating and revision of hydrodynamic reservoir model;
revision of field development programme.

Distinctive features:

assessment of PTA quality;
working out solutions to improve the quality of well testing taking into account development target features;
solubility of field development challenges.

Complex analytics

Isobar map

Goals and objectives:

There are different mapping techniques

The range of results application:

Main types of interpolation:

Interference test based on correlated data examination

Goals and objectives:

The range of results application:

Distinctive features:

Complex analysis of PTA

Goals and objectives:

The range of results application:

Distinctive features:

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