Physical Properties of Agbabu and Yegbata Bitumen in Nigeria
Physical Properties of Agbabu and Yegbata Bitumen in Nigeria
Physical Properties of Agbabu and Yegbata Bitumen in Nigeria
uk
Provided by Afe Babalola University Repository
Shadrach Olise Ogiriki*, Jennifer Oyindamola Adepoju, Adeyinka Sikiru Yusuff and Victor
Anochie
Department of Chemical and Petroleum Enigeering, Afe Babalola Univetsity, Km 8.5, Afe
Babalola Way, P.M.B. 5454 Ado-Ekiti, Nigeria
Abstract
This experimental work evaluates the physical properties of Abagbu and Yegbata bitumen from
Nigeria with comparison with that of Canada being the world largest producer of crude oil from
bitumen. This study employed the American Society for Testing and Materials (ASTM) methods in
conducting laboratory experiments in order to determine the viscosity, specific gravity, API (American
Petroleum Institute) gravity, pour point and flash point. A Gas Chromatograph (GC) was used to
determine the hydrocarbon content of the bitumen samples. Test results showed that the specific
gravity for the bitumen sampleswas 1.01 with a 0.9962 OAPI for Yegbata, while that of Agbabu
bitumen sample was 8.599 specific gravity and 10.54 OAPI. Kinematic viscosity was 1.0×102 to
3.3×104 and 1.6×103 to 5.6×104, flash point of 288oC and 282oC and pour point of 44oC and 47oC.
The gas chromatography analysis showed that the samples contained 46.35% and 7.59% saturates,
21.63% and 64.39% aromatics and 32.03% and 28.01% resins for Agbabu and Yegbata respectively.
In comparison with Athabasca bitumen, the results were similar. The assessment and comparison of
these properties with the properties of bitumen from Athabasca in Canada reveals that any surface or
subsurface crude bitumen gotten from Agbabu and Yegbata in Ondo State, Nigeria can be exploited
using similar technologies, if not the same as the technologies being used in Athabasca, Canada
Keywords: Tar sand, Bitumen, Agbabu, Yegbata, Nigerian Bitumen, Nigeria, Physical properties,
1. Introduction
Bitumen is a mixture of organic liquids that are highly viscous, black, sticky, entirely soluble in
carbon disulphide, and composed primarily of highly condensed polycyclic aromatic hydrocarbons.
Bitumen in its natural form is characterised by high viscosity, high density (low API gravity: which is
the inverse of crude oil density relative to that of water. This is used to compare crude oil densities of
crude oils), and high concentrations of nitrogen, oxygen, sulphur, and heavy metals [1]. Bitumen can
also be described as a sticky, tar-like form of petroleum which is so thick and heavy that it must be
heated or diluted before it will flow. Bitumen is found in tar sands, which are also a combination of
clay, sand and water [2], it is extracted from these tar sands and then refined into oil. At room
temperature, it has a consistency much like cold molasses (thick dark syrup produced by boiling down
juice from sugar cane; especially during sugar refining). Refined bitumen is the residual (bottom)
fraction obtained by fractional distillation of crude oil. It is the heaviest fraction and the one with the
highest boiling point, at 525 °C (977 °F). It can also be refined to produce commercial products such
* Corresponding author.
E-mail address: shadrachogiriki@abuad.edu.ng
Manuscript History:
Received 6 September, 2017, Revised 19 March, 2018, Accepted 23 March, 2018, Published 31 March, 2018
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as gasoline, fuel oil and asphalt. Bitumen and extra-heavy oils are unconventional crude oils that
generally require additional processing to extract, transport, and refine into petroleum products than
conventional oils [3]. These additional steps typically incur additional costs - including investment
costs as well as environmental and social costs [3]. As conventional oil reserves decline, oil and gas
companies are increasingly turning their attention towards unconventional oils to meet rising global
demand for petroleum products.
Nigeria has an estimated 38 billion barrels of extra-heavy oil and bitumen reserves [3]. While
this amount is significant, and roughly equivalent to its present conventional oil reserves, this amount
is much smaller than Canada’s 2.4 trillion barrels and Venezuela’s 2.1 trillion barrels [3]. Nigeria has
the sixth largest bitumen deposit in the world with most of the reserve found in Ondo state [3]. The
discovery of the Nigerian Bitumen dates back to the early 18th century. The history of bitumen in
Nigeria goes as far back as 1903 [4]. The Nigerian bitumen reserves are found in Lagos, Ogun, Ondo
and Edo States. Nigeria being one of the largest producers of crude oil however, the mid-stream sector
of the oil and gas sector has made her heavily dependent on importing refined petroleum products and
this includes bitumen. Currently, Nigeria’s annual consumption of bitumen is a little over 500,000
metric tonnes and the market has been quite stable and increasing due to the epileptic performance of
the Kaduna refinery which is the only refinery in the country that produces bitumen at the moment.
Three potential methods of bitumen extraction in Nigeria are:
1. Small-scale surface mining
2. Large-scale surface mining, and
3. Thermal extraction method.
The depth of bitumen below the surface determines which extraction type is possible. Both
thermal extraction and large - scale surface mining operations are most likely to extract bitumen for
upgrading into synthetic crude oil and/or other petroleum products. Bitumen from small-scale surface
mining is likely to only be economical to use for paving roads. The three types of extraction methods
stated above may have environmental impacts [3]. These impacts vary widely. While surface mining
completely transforms the entire surface of the mining area, thermal sub-surface extraction renders
changes to the underground. Most environmental impacts will directly affect land-based livelihoods
throughout Nigeria’s bitumen belt. For each type of extraction, impacts are ranked from ‘HIGH’, or
large-scale, significant impact to ‘LOW’, or smaller- scale, moderate impact [3].
Thermal extraction involves the drilling of wells to extract the bitumen from the subsurface.
(75-400m and further below the surface) [3]. Canadian projects currently use two types of thermal
extraction methods:
1. Cyclic Steam Stimulation (CSS), and
2. Steam Assisted Gravity Drainage (SAGD).
The existence of bitumen in Nigeria dates back to its discovery in the early 18th century.
However, due to the discovery of conventional crude oil in commercial quantities in the early 1960’s
among other factors, bitumen has since its discovery in Nigeria, remained untapped. Crude oil is a
major source of energy in Nigeria and the world in general. For the past three decades, crude oil has
been a major source of revenue and foreign exchange for the Nigerian economy. In the recent years,
there has been a drastic drop in the price of a barrel of Brent crude to as low as $27.67 and $28.36 for
US crude. This occurrence among others has shun more light to the bitumen industry in Nigeria. The
techniques involved in extracting bitumen from the subsurface are now being evaluated and
compared.
One major problem associated with extracting bitumen from subsurface formations is that it
requires more advanced methods than those used to extract conventional oils. This is due to the high
viscosity of bitumen. For this reason, coupled with other properties of the bitumen, selecting the most
effective recovery method that would have little or no negative impact on the environment has been a
major challenge in the bitumen industry.
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This research evaluates the physical properties of Nigerian bitumen through laboratory tests
(some of which include viscosity tests, specific gravity tests, pour point test, among others) and thus
infer the best thermal recovery process for the bitumen deposits.
This study is limited to Nigerian bitumen deposits. Samples were collected from Ondo state in
the south-western part of Nigeria. Experiments were conducted with this bitumen samples. The results
and inferences made are limited to these samples.
The tar sand samples were obtained from two (2) different locations in Ondo State. Both
samples were collected from locations within latitude 6o38ˈN and 6o39ˈN and longitude 4o55oE and
4o34oE of the Greenwich Meridian [5]. Sample A was obtained from Agbabu, situated in Odigbo,
Ondo State, Nigeria lying on the coordinates 6o35ˈ0" North, 4o50ˈ0" East. Sample B was obtained
from Yegbata, Ondo State, Nigeria.
The samples were collected from the surface of the ground from the vast tar sands outcrops and
sealed in polythene bags to prevent the oxidation of the hydrocarbons before being taken to the
laboratory.
The bitumen samples were extracted from the tar sands using the soxhlet extraction process.
Experiments were carried out on the extracted bitumen samples to determine their physical properties.
The physical properties determined in the laboratory include:
1. Density
2. Viscosity
3. Flash Point
4. Pour Point
5. Hydrocarbon Content
The Brookfield rheometer was used to determine the viscosity of the bitumen. This rheometers
operate by rotating a spindle in the sample. Viscosity is determined by measuring resistance to this
rotational force [7], while the flash point of the bitumen was determined with the ‘open-cup’ test
method using the Cloveland open cup apparatus.
For the purpose of this study, the ASTM D97, Standard Test Method for Pour Point of Crude
Oils also known as the Manual Method was used to determine the pour point of the bitumen sample as
shown in Figure 3-5 below.
The obtained tar sand samples were in a solid compact form. As it was difficult to work with the
tar sand samples in this form, the samples were crushed into powder and the bitumen was extracted
from the tar sand using the soxhlet apparatus, as shown in Figure 1, with toluene as the extraction
solvent.
The Soxhlet extractor, invented in 1879 by Franz von Soxhlet, was initially used to extract
lipids from solid materials. The extractor only works when the solute being extracted has limited
solubility in the solvent in which it is dissolved. This means that the Soxhlet extractor cannot be used
to extract ionic salts from polar solvents such as water, because the solubility limit of such salts in
water is extremely high. A Soxhlet Extractor has three main sections: A percolator (boiler and reflux)
which circulates the solvent, a thimble (usually made of thick filter paper) which retains the solid to be
laved, and a siphon mechanism, which periodically empties the thimble.
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The soxhlet apparatus operates with the evaporation of gas formed from the heating of the
solvent in the flat bottom flask into the condenser and the condensation of this gas back to liquid into
the core in the long neck flask (reflux) where it cleans the oil from the pores of the core sample. The
process is a continuous cycle that is repeated until the solvent going back into the flat bottom flask
appears as a clear liquid.
2.3 Density
The density test was carried out using a pycnometer and a weighing balance. The value obtained
for the density was then used to estimate the specific gravity and API gravity using standard equations.
Density determination by pycnometer is a very precise method. It uses a working liquid with
well-known density, such as water to determine the unknown density of another fluid. For this
experiment, distilled water was used as the reference liquid. Pycnometer, a precision piece of
glassware consists of two portions: a bottle and a stopper. The bottom portion is a small bottle with a
volume which may be accurately determined from the mass of water it holds at a particular
temperature. The stopper is a capillary tube with a ground glass (frosted) bottom that fits snuggly into
the ground glass (frosted) neck of the bottle [6]. The pycnometer is used in ISO standard: ISO 1183-
1:2004, and ASTM standard: ASTM D854. Figure 2 shows the pycnometer being used to determine
the density of the bitumen.
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2.3.1 Calculations.
The following equations were used to calculate various variables for this study.
Weight of water, :
(1)
Volume of pycnometer,Vpyc:
(3)
Since the pynometr was used for both the bitumen sample and water, therefore the
volume of bitumen, is derived from equation ;
(4)
:
Therefore, the density of bitumen sample, AB
(5)
The organic composition of the bitumen samples was evaluated by a gas chromatograph
(GC).The American Heritage Dictionary defines GC as a physical method of separation in which the
components to be separated are distributed between two phases, one being a stationary bed of large
surface area, and the other a gas that percolates through the stationary bed. When the stationary phase
is a solid, the separation process is more precisely called gas solid chromatography. This technique is
generally used to separate gases in a gaseous solution. The more common technique (which was used
in this experiment) is gas liquid chromatography (GLC) in which the stationary phase is a porous solid
covered with an absorbing liquid. GLC is used to separate a wide variety of organic compounds.
The basic requirements for GLC are that the sample be volatile and that it not decompose in the
vaporization process. Since the vaporization occurs in an inert atmosphere, decomposition of the
sample is generally not a problem.
For the purpose of this research, a GC with a cool on–column injection port and GC oven
cooling fan domiciled in the Department of Chemical and Petroleum Engineering Chemical Analysis
Laboratory, Afe Babalola University was used to analize the samples. The GC is automated as the
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results obtained were in graphics as shown in Figure 3 and Figure 4. The GC parameters are listed in
Table 1.
3. Results
3.1 Density
For the experiments carried out to determine the density of the bitumen samples, the following
results were obtained:
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3.2 Viscosity
The viscosity for both bitumen samples were determined at temperatures of 100oC, 80oC, 60oC
and 40oC. Table 4 shows the values of the viscosities obtained for each sample at the above stated
temperatures.
Table 4. Viscosity values obtained for bitumen samples at various temperatures
Agbabu Yegbata
The temperatures representing the flash points obtained for both samples are recorded in Table
5.
1 Agbabu Yegbata
288oC 282oC
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The temperatures representing the pour point obtained for both samples are recorded in Table 6.
The actual pour point was estimated by adding 3oC to the obtained pour point as stated in the
procedures in appendix A.
The results obtained for the GC analysis of the bitumen samples are shown in Table 7 and 8 and
the graphs shown in Figure 3 and 4.
o-Xylene C8H10
1,3-dimethybenzene C6H4(CH3)2
1,4-dihydro-(4-
methylphenyl)methanol
4 Benzene, 1,2,3-trimethyl- C6H3(CH3)3 12.28 2.57 Aromatics
mesitylene-
Benzene, 1,2,4-trimethyl- C6H3(CH3)3
mesitylene-
5 3-methyl-1- 24.603 8.58 Resins
adamantaneaneactic acid
pyridine
Bis(1-methyl) ester
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1,4-dimethyl-adamantane C12H20
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4. Discussion
In summary, the results for all the properties of the bitumen samples are highlighted in Table 9.
This Table 9 highlights the properties of the bitumen samples from the two locations in Ondo state
Nigeria. Applying equation (5), the values obtained for density for both locations are 1.0085g/cm3 and
0.9932g/cm3 for Agbabu and Yegbata respectively. The result shows that the Agbabu bitumen has a
higher density than that of Yegbata,and is also denser than water with density of 0.99705 g/cm3 at the
same temperature of 25oC. This indicates that the bitumen would sink while the water floats, if both
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samples are mixed at 25oC. These values compare favourably with the density value of 2.24g/cm3
obtained at Agbabu by Akande [8].
The density obtained for both samples were used to estimate the specific gravity of both
samples applying equation (6). The values obtained for specific gravity are 1.01 and 0.9962 at
25oC/25oC for Agbabu and Yegbata respectively as shown in Table 9. The specific gravity values
compare favourably with the value 0.92 and 0.95 obtained by Guma et al. [9] at two other different
locations in Ondo state. It also compares favourably with that of asphalt having 1.013 specific gravity
[9]. The specific gravity values were used to estimate, with equation (7), the API gravity values for
both locations and values of 8.60oAPI and 10.54oAPI were obtained for Agbabu and Yegbata
respectively. These values fall within the range of API gravity of bitumen defined by Subramanian et
al [10] and Lancaster [11].
The temperature values recorded as the flash point for each sample were observed as shown on
the Table 5 and Table 9 as 288oC and 282oC for Agbabu and Yegbata respectively. These flash point
values lie within the value range of 245oC to 325oC as reported by Guma et al. [9] for most bitumen of
good grade. The pour point observed for both locations are 44oC for Agbabu and 48oC for Yegbata
respectively. These valeus compare favourably with the vales of 44.70oC obtained by Adebiyi et
al.[29].
Table 9. Comparison of the physical properties of Agbabu, Yebgata and Athabasca bitumen
The viscosity of both bitumen samples were observed at various temperatures of 100oC, 60oC
and 40oC as shown in Table 4. The kinematic viscosity of Agbabu bitumen ranges from 1.0×10 2 cSt-
3.3×104 cSt as the temperature decreased from 100oC-40oC. That of Yegbata ranged from 1.6×103 cSt-
5.6×104 cSt as the temperature decreased from 100oC-40oC.
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The gas chromatography analysis carried out on the samples showed that the samples contained
46.35% and 7.59% saturates, 21.63% and 64.39% aromatics and 32.03% and 28.01% resins for
Agbabu and Yegbata respectively.
4.1 Density
From Table 9, it can be seen that the density of the bitumen samples of both location (Agbabu
and Yegbata), obtained was 1.0085g/cm3 and 0.9932g/cm3 at 25oC respectively, which has a close
range. This similarity also falls within a close range with the value of 2.24g/cm3 reported by Akande
[8]. Comparing this values obtained, with the value of 1.0077g/cm3 estimated by Strausz [12], it can be
seen that there exist minute differences in the density of the bitumen samples and that of the
Athabasca bitumen. Yaser et al. [13] estimated a value of 1.0129g/cm3 for the Athabasca bitumen
which is also similar to the values obtained for the bitumen for both locations. The Alberta
Department of Energy [14] reported values of 1.0136g/cm3 and 0.9945g/cm3 for the bitumen density at
15oc and although at lower temperature the values are close.
The specific gravity obtained for both locations as shown in Table 9 are 1.01 and 0.9962 for
Agbabu and Yegbata respectively. The specific gravity of bitumen gives an estimated measure of the
amount of lighter hydrocarbons present [15]. Lower specific gravity which corresponds to higher API
gravity yields more light fractions during fractional distillation. The values obtained for the samples
fall within a close range to each other. These values are also within the range of asphalt standard of 0.9
- 1.013 [15] obtained from the same geological location. This low specific gravity value indicate that
the bitumen is of high quality. The specific gravity values compare favourably with the values
reported by Guma et al. [9].
Generally, API gravity determines the grade of bitumen and its value increases with decrease in
specific gravity. Low API gravity as in the case of the bitumen samples used for the study is
associated with either bio-degraded oil or with immature sulphur-rich oils.
From Table 9, the API gravity obtained for both location is 8.60 and 10.54. These values show a
close range of API gravity values with the range of 8.88 – 10.78oAPI which falls within the
specifications of Nigerian Association of State Highway and Transportation Officials Standard for
Road Materials and also compare favourably with the values (1.011, 0995, 1.001) oAPI obtained by
Onajake and Ndubuka [15]for other samples within the same geographic location and 10.060oAPI
reported by Adebiyi et al. [16], for Nigerian bitumen. The range of API when compared with those
obtained from Athabasca Canada and Cold Lake bitumen samples with API gravity of 8.1 and
10.8oAPI respectively, reported by the Alberta Department of Energy [14], compares favourably.
4.3. Viscosity
Viscosity is a measure of internal friction of a liquid to the reluctance of a fluid to flow freely. It
therefore indicates the ability of a fluid to flow from the point to another. Kinematic viscosity
represents the dynamic viscosity of a fluid per unit density expressed in cSt (Centistoke). Viscosity
affects the performance of injection systems [15]. Low viscosity can result in excessive wear in some
injection pumps and power loss due to pump and injector leakage. High viscosity fluids on the other
hand cause excessive pump resistance or filter damage and higher line pressures [15]. From Table 4, it
can be seen that the viscosity for Agbabu bitumen ranges from 995.5 to 3.3×104 cSt as the temperature
decreased from 1000C to 40oC. For Yegbata bitumen, the kinematic viscosity values range from
1.6×103 to 5.6×104 cSt as the temperature decreased from 1000C to 40oC. These values agree with the
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value range of 4.3×103 to 5.6×103cSt reported by Onajake and Ndubuka [15]. These ranges are higher
than the value range of 1.8×104to 1.0×106 cSt reported by Laricina Energy [17].
The values reported by the Alberta Department of Energy [14] are also lower than the value
ranges of the Nigerian bitumen, this agrees with Onajake and Ndubuka [15] report that the Nigeria
bituminous sands are higher in viscosity than its Athabasca Counterpart. The high viscosities of the
bitumen samples are also attributed to its asphaltene content. This high viscosity is advantageous in
that the bitumen in its deposits will not flow into the environment to cause pollution in the event of
spillage like the conventional oil will do.
Flash point measures only the response of the bitumen sample to heat and flame in or controlled
laboratory conditions. The values obtained for the flashpoint of the bitumen samples as shown in
Table 5 are 288oC and 282oC for Agbabu and Yegbata respectively. These values are higher than the
260oC and 269oC obtained by Guma et al. [9] from samples obtained within the same geographical
locations. The values can be seen to fall within the flash point range of 245 to 352 oC reported by
Guma et al. [9] in assessing the overall flammability hazard of samples, the flash point must be
considered.
Pour point when used in conjunction with the reservoir temperature gives a better indication of
the condition of the oil, in the reservoir than does its viscosity, thus it presents a more accurate
assessment of the condition of the oil in the reservoir, being an indicator of the mobility of the oil in
the reservoir.
For the sampled bitumen, following the pour point determination procedures stated in Appendix
A, the temperature values of 44 OC and 48 OCwere obtained for Agbabu and Yegbata respectively,
with the Agbabu bitumen precise, while the Yegbata bitumen is close to the value of 44.70 OC
obtained by Adebiyi et al. [16], indicating the very low mobility on the bitumen fluids at reservoir
conditions. It also compares favourably with the pour point temperature range of 50 to 100oC
identified by Speint. In summary, the pour point is an important consideration because, for efficient
production, additional energy must be supplied to the reservoir by a thermal process to increase the
reservoir temperature beyond the pour point.
4.6. GC Analysis
The results obtained from the gas chromatography are shown in Table 7 and Table 8 for Agbabu
and Yegbata respectively. The results provide the hydrocarbons present in the bitumen samples from
both locations. It gives the chemical formula of the samples, their retention time, mole% area and the
group of hydrocarbons to which each belongs. From the tables, it can be seen that there exist no long
chain asphaltenes compounds in the bitumen samples from both locations, but there exists saturates,
aromatics and resins in both samples. The compositions of these hydrocarbons were used for the
SARA composition as shown on Table 9. Form Table 9, it can be seen that the bitumen from Agbabu
contains 46.35% saturates, 21.63% aromatics and 32.03% resins and that of Yegbata contains 7.59%
saturates, 64.39% aromatics and 28,01% resins.
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5. Conclusions
It can be concluded that the samples of bitumen from Agbabu and Yegbata in Ondo State of
Nigeria has similar physical properties with Canadian Bitumen. The physical properties of the samples
bitumen from Agbabu and Yegbata in Nigeria makes it feasible for exploitation. The bitumen is also
can be exploited or developed using the techniques employed in the development of Canadian
Bitumen.
Acknowledgments
The authors acknowledge the Management of Afe Babalola University for the use of its facilities for
this study.
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