IRJET- Analysis of Reserve Estimation using Volumetric Method on Taq Taq Oil Fields

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 12 | Dec 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 295
Analysis of Reserve Estimation using Volumetric Method on
Taq Taq Oil Fields
Husainov Mart А1, Abyzbaev Nikita I2, Abyzbaev Ibragim I3 , Rawand Dlshad A4,
Hiwa Hamaamin M5
1Assistent Professor, Dept. of Development and operation of oil and gas fields, Ufa State Petroleum Technological
University, Ufa, Russian Federation
2,4,5Student, Dept. of Development and operation of oil and gas fields, Ufa State Petroleum Technological
University, Ufa, Russian Federation
3Professor, Dept. of Development and operation of oil and gas fields, Ufa State Petroleum Technological
University,Ufa, Russian Federation
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Abstract - In Petroleum reservoir studies and management,
a correct description of the quantity of the existing fluid is
very essential in quantifying the sources and choice of
production techniques, costs and general management of the
reservoir. The information obtained is also the basis for
resource development and planningsubsequentlythe need for
cross-examination to mitigate inherent problem resulting
from overestimation or below estimation. It is expected that
oil and gas production is measured with confidence since
industries revenues are based on oil and gas sales. It is the
process by which the Economically recoverablehydrocarbons
in a field, area, or region is evaluated quantitatively. In this
work, the volumetric method estimation reserve was used In
the four reservoirs (pilspe, shiranish, kometanandqamchaqa)
of the Taq Taq field. The OIIP estimates obtained from the
analysis of the reservoirs (pilspe, shiranish, kometan and
qamchaqa) were 322.296 MMSTB, 149,264,519,309 STB,
49716600472 STB and 25429490369 STB for volumetric
method respectively.The information obtained in the
estimated reserves from the Taq Taq field is the basis for
resource development and planning for the developmentTaq
Taq field.
Key Words: Reserve, Volumetric Method, Original Oil In
Place, Recoverable Oil Reserves, oil and gas field.
1. INTRODUCTION
Reserves are estimated volumes of crude oil, condensate,
natural gas, natural gas liquids, and related substances
anticipated to be commercially recoverable from known
accumulations from a given date forward, below existing
economic conditions,throughinstalling,operatingpractices,
and under current government regulations. Reserve
estimates are based totally on geologic and/or engineering
data reachable at the time of estimate. Reserves estimation
is one of the most imperative duties in the petroleum
industry. It is the process by which the economically
recoverable hydrocarbons in a field, area, or place is
evaluated quantitatively.
1.1 Types Of Reserves
Fig 1. Resource Flow Chart
The relative degree of an estimated uncertainty is
reflected by the categorization of reservesaseither"proved"
or "unproved"
A. Proved Reserves can be estimated with reasonable
certainty to be recoverable under current economic
conditions. Current economic conditions include prices and
costs prevailing at the time of the estimate.
B. Unproved Reserves are based on geological and/or
engineering data similar to those used in the estimates of
proved reserves, but when technical, contractual, economic
or regulatory uncertainties preclude such reserves being
classier as proved. They may be estimated assuming future
economic conditions different from those prevailing at the
Time of the estimate.
Unproved reserves may further be classified as probable
and possible.
A. Probable reserves are quantities of recoverable
hydrocarbons estimated on the basis of engineering and
geological data that are similar to those used for proving
reserves, but that lack, for various reasons, the certainty
required to classify the reserves as proved.
B. Possible Reserves Possible reserves are quantities
of recoverable hydrocarbons estimated on the basis of
engineering and geological data that are less complete and

less conclusive than the data used in estimation of probable
reserves.
2. Reserve Estimation
Estimation of the in place oil and gas volumes and its
recoverable part (reserves)happenstobeasignificantphase
in the various activitiesleading to the developmentofoiland
gas fields.The ultimate target of all oil companies is to
increase their income by producing oil and gas. The key
parameter to produce oil/or gas is the investments such as
purchasing licenses, drilling wells, and constructing
production facilities.Companies program their investments
to a particular field by analyzing the ultimate recovery from
that field.
2.1 Types Of Reservoir Estimation
Reserves-estimation methods are broadly classified as an
analogy, volumetric,andperformancetypes.Volumetricand
performance methods are the more elaborate techniques,
and the main difference between the two is the type of data
used relating to pre- and post- production phases.
• Volumetric Method: As the name suggests, this method
requires the volume of the reservoir to be calculated
through maps and Petro physical data of the drilled wells.
This method is carried out in the early phasesof exploration
to find the amount of Oil and Gas in place and the likely
corresponding reserves.
• Material Balance Method: This method is carried out in
the intermediary stages of the exploration and thus the
production of Oil and Gas is estimated
• Decline Curve Analysis: This method is carried out inthe
late life of the field when most of the Oil and Gas has already
been produced and the field production rate is on the
Decline. The future production forecast gives the reserves.
3. Reserve Estimation Using Volumetric Method.
Here we consider a Zone named Pilasp (Total EoceneZone)
and Shiranish Kometan Qamchuqa (Total Cretaceous
Zones) from the Taq Taq oil field. In order to estimate the
reserves using the volumetric method we need to know the
data generatedfromgeological andpetrophysical evaluation
.Here we need to find original Oil in Place (OOIP).
3.1. Data Requirements
The following data are required for volumetric method:
1. Rock Volume (acre feet) = A * h
A= Drainage area, acres
h = Net pay thickness, feet
2. Ø = Porosity, fraction of rock volume available to store
fluids
3. SW = Volume fraction of porosity filled with
interstitial water
4. Bo = Formation volume factor (Reservoir Bbl/STB)
5. 1/Bo = Shrinkage (STB/reservoir Bbl)
3.1.1. Rock Volume Calculations (A * h)
Reservoir volumes can be calculated from net pay isopach
maps by planimetering to obtain rock volume (A * h). To
calculate volumes it is necessary to find the areas between
isopach contours. Planimetering can be performed by hand
or computer generated. Given the areas between contours,
volumes can be computed using; Trapezoidal rule,
Pyramidal rule, and/or the Peak rule for calculating
volumes.
3.1.2. Porosity:
Effective porosity of a sample is defined as the following
ratio:
Effective porosity of the reservoir rock can be determined
from study of core analysis.
3.1.3. Interstitial Water Saturation, Swi:
Water saturation is defined as the following ratio:
Interstitial or connate water saturation may be determined
from electric logging information or by laboratory
determinations run on cores by restored state, evaporation
mercury injection, or centrifuge methods.
3.1.4. Formation Volume Factor
The volumetric calculation uses the initial oil or gas
formation volume factor at theinitial reservoirpressureand
temperature.Both Bo and Bg are functions of fluid
composition, reservoir pressure and temperature and
consequently of reservoir depth. The Bo and Bg values from
analogous offset pools are often used as an initial estimate
for the prospect under consideration.
Where:
Bgi= Initial gas formation volume factor (res bbl/SCF)
pb= Base pressure (psia)
pi= Initial reservoir pressure (psia)
Tb= Temperature at base conditions (0C)
Ti= Temperature at initial conditions (0C)
Zb= Gas deviation factor at base conditions
Zi= Gas deviation factor at initial reservoir conditions.

4. Data Used.
1. Reservoir And Fluid Properties.
Table -1: Reservoir And Fluid Properties of Taq Taq Field
- Iraq
2. Geological/Petro Physical Data.
Table-2:Geological Data And Other Reservoir.
Information of Taq Taq Field - Iraq
5. Calculations
The equation for the volumetric determination of original
oil in place (OOIP) is given as:
We have to take the data from the (table 1,2). Initially, we
have to take the area and net pay thickness to determine
the rock volume for each zone.
 Rock Volume (acre feet) = A × h
• A= Drainage area, acres
• h = Net pay thickness, feet
Note: 7,758 = API Bbl per acre-feet (converts acre-feet to
stock tank barrels)
 7,758 × 157 × 0.30 × (1 - 10.0) × 1/0.98 =
3,222,843.876 STB
Original Oil In Place (OOIP) (pilaspe zone) =
3,222,843.876 STB
In The Table.3 Below Shows Results Original Oil InPlaceFor
Each Zone In Taq Taq Field.
Table-3: Crude Oil Reserve Taq Taq Field-Iraq
6. CONCLUSIONS
 Reserve estimation is very crucial for a reserve to
make decisions. Estimation provides the
confidence about the economical feasibility to
produce from a reservoir; whetheritiscost worthy
or not.
 Using a volumetric method for finding the original
Oil in place has limitations on the basis of data’s
available from the field.
 The initial oil in place of the four reservoirs (pilspe,
soreness, comedian and qamchaqa) in the oil field
was found as 3,222,962,93 STB, 149,264,519,309
STB, 49716600472 STB and 25429490369 STB.
 Same values can be find out with the help of other
methods known as (a) Material Balance Method &
(b) Simulation Method using software.
REFERENCES
[1] Ahmed T. Equations of state and PVT analysis. :
Elsevier, 2013.
[2] Craft B.C., Hawkins M., Terry R.E. Applied
Petroleum Reservoir Engineering. 2nd // 1991.
[3] Dake L.P. The practice of reservoir engineering. :
Elsevier, 2013.
[4] Hong K.C. Steamflood reservoir management:
thermal enhanced oil recovery. : PennWell Books,
1994.

[5] Iqbal G., Satter A. Fundamentals of reservoir
engineering // Methods Appl. Reserv.
[6] Taq Taq Operating Company (TTOPCO), 2007:
Internal report.Unpublished.

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