ENHANCEMENT OF OIL RECOVERY BASED ON
ANALYSIS OF PRODUCTION RATE AND ROCK
PROPERTIES
Master: Academic adviser:
Zulfugarova Narmin Khayal Y. V. Mammadova
2 year student, R2237
All over the world, interest in methods of increasing oil
recovery, and research is developing to find evidence-based
approach to the selection of the most efficient technologies of
field development.
In order to increase the economic efficiency of reservoir
development, decrease of capital investment and the maximum
possible use of investment, the whole period of development of
the field is divided into three main stages.
On the first stage, existing reservoir energy is used as
much as possible for the extraction of oil (elastic energy,
dissolved gas energy, energy of contour waters, gas cap and
potential energy of gravitational forces). In determining
feasibility of the primary development of deposits on native
mode the advantages of this mode must be taken into account,
which consist in uniform distribution of reservoir energy
throughout the volume of the reservoir system, which
contributes to the maximum coverage of the reservoir oil
recovery process. This is very important for heterogeneous
fractured deposits, in the development of which methods
involving artificial impact on the reservoir, it is not possible to
achieve high oil recovery due to low seam coverage.
At the second stage, water or gas pumping methods of
reservoir pressure maintenance are implemented. These
methods are called secondary.
At the third stage tertiary methods for oil recovery
enhancement are used. These are called modern methods to
increase the efficiency of field development.
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The choice of technologies used, as well as the choice of
their sequence application, must be determined separately for
each reservoir, taking into account the geological and physical
characteristics of the layers and on the basis of the whole
researches in complex, listed above.
There is more oil remains in the oil fields than is
recovered from them by the end of the field life. Various
factors can influence recovery from reservoir, including
complexity of the geology, physics of fluid and economics.
Specific operations could be carried out for oil recovery by
changing the physical and chemical properties of reservoir
fluids.
As it is mentioned earlier, majority of oil companies are
concentrated on maximizing the recovery factor (RF) from
their reservoirs as well as preserving an economic oil rate. The
reason is in it is increasing difficulties of discovering new
oilfields. Majority of the basins that may contain hydrocarbons
had already been explored and new findings tend to be minor.
Those sedimentary basins that left unexplored, usually are
remote and in environmentally delicate areas (e.g. the
Antarctic). Despite of the fact, there are big volumes of
unconventional reserves, such as very oil shales, shale gas and
gas hydrates and viscous oils, most of the technologies for
utilizing the resources are either high energy usage, politically
or environmentally sensitive or are not still ready to be used at
scale.
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