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in investigating the development of a solution gas drive in a
reservoir.
6. The formation piezoconductivity factor characterises
the rate of transmission of pressure in the formation and is used in
investigating the elastic properties of the formation and fluid.
The validity of the development plan depends on the
completeness and accuracy of the geological-physical survey of
the reservoir.
Inadequate initial data hampers the plotting of isopachous,
permeability, porosity and piezoconductivity graphs and make it
necessary to rely on average data in hydrodynamic calculations.
Reservoir development planning should be based on data
from test wells drilled to the productive strata, which upon
sampling produced oil, water and gas.
Surveys of all the wells of a field should cover the
following points:
1. Core sampling. This should include continuous cores
of the productive strata. Cores are used for determining the
physical and lithological characteristics of the strata.
2. Electrical loggings, laterlog and well-deflection
measurements which are used to construct maps and profiles. For
greater accuracy, electrical logging should be correlated with the
cores.
3. Neutron and gamma-ray logging to establish more
positively the structure and physical characteristic of the
formation.
4. Deep sampling of oil, gas and water under formation
pressures. Laboratory analysis of such samples under formation
temperatures are conducted to determine the physicochemical
characteristics of the reservoir fluids.
5. Formation pressure measurements. Well flow surveys
under different conditions of operation. Establishing the
relationship between flow and bottom-hole pressure. Determining

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