SCIENCE & TECHNOLOGY |
Interstate gas network Self-sufficiency of gas in India Natural gas is becoming the most popular fuel for use in cooking, transport, fertilisers and power generation. This is because of two reasons. First like coal and oil, burning of gas does not produce harmful and toxic gas oxides. Second, import of gas is cheaper than import of oil to develop a given amount of energy. If gas reserves are explored and developed within the country, the economic benefits are still higher. Therefore, the recent discoveries of gas in India and revival and resurgence of hydropower augur well for a great economic renaissance. |
Interstate gas network Natural gas is becoming the most
popular fuel for use in cooking, transport, fertilisers and power
generation. This is because of two reasons. First like coal and oil,
burning of gas does not produce harmful and toxic gas oxides. Second,
import of gas is cheaper than import of oil to develop a given amount
of energy. If gas reserves are explored and developed within the
country, the economic benefits are still higher. Therefore, the recent
discoveries of gas in India and revival and resurgence of hydropower
augur well for a great economic renaissance. In order to fully
understand the gas economics, some basic terms of gas usage need to be
understood. Natural gas is primarily composed of methane (87%) with
small quantities of nitrogen, oxygen, CO2, sulfur, water (2%) and
higher hydrocarbon like ethane, propane and butane (11%). Under
intense compression and cooling, gas assumes liquid state at - 162ºC
and is called Liquified Natural Gas (LNG). The natural gas has to be
liquified for the purpose of transportation from one country to
another through sea vessels. CNG is the natural gas compressed to a
pressure of 9-10 Kg/Cm2 in cylinders for use in vehicles. As a result
of Supreme Court order in 1998, the Delhi Government had to set up
Indraprastha Gas Limited (IGL), to promote CNG as a vehicular fuel in
the city. The company laid a 23-km pipeline from Dhaula Kuan to G.T.
Karnal by-pass road. 120 CNG stations were set up and CNG is being
provided to all the three-wheelers and buses in Delhi. The number of
CNG powered vehicles has increased to 90000 in March, 2003. Besides,
2300 vehicles are added every month to run on CNG. IGI has also
expanded its network to provide PNG (piped natural gas) connections to
17000 households and 110 commercial organisations. LPG is liquified
petroleum gas and consists of higher fraction of propane and butane. Prospecting
Gas Demand: Before recent discoveries, the Govt of India had a
limited vision of gas usage in India. This was because of two
reasons: 1. Import of natural gas by sea by first converting it into
LNG followed by regasification is not very economical as compared to
import of oil. 2. Bangladesh is not allowing laying of a pipeline
from Agartala to Kolkata for transportation of gas from reserves in
Tripura. Bangladesh is also not selling its huge reserves of gas to
India or to any other country because of some irrational
reasons. Natural gas can be used copiously for five purposes. i.e
power generation, domestic supplies (cooking) industry (captive power
generator and heating of boilers), transport and fertiliser plants.
These five uses can use any amount of gas provided. There is no limit
to its supplies. Present discoveries indicate a gas reserve of 1800
BCM (Billion Cubic Meter) and 1000 BCM of coal bed methane (CBM) only.
Present consumption of gas from existing resources (new discoveries
have not been used so far) within the country is 80 MMS CMD (million
standard cubic meter per day). Import of gas has started from January
this year only. The indigenous resources (200 BCM) can run for 40
years @ 200 MMS CMD or @ 400 MMSCMD for 20 years. In fact the present
consumption is also severely limited by the lack of distribution
infrastructure from gas reserves to different parts of the country.
PETRONET LNG Limited (a joint venture of public sector oil companies)
has also purchased gas from Qatar (25 MMSCMD) and 9 MMSCMD supply will
start this year (January, 2004) from Dahej terminal. Petro-dyine is
also importing 9 MMSCMD gas from Holland to bring it to Hazira
terminal. Gas Authority of India has been given the selling right of
70% of the PETRONET supplies and it is becoming difficult for GAIL to
find customers. Gas discoveries: There has been virtually no
new discovery of gas reserves in India since 1973 till 2000 A.D.
Earlier discoveries were in Assam and Tripura. The latest major
discovery of oil and gas reserves was in Bombay High (1972-73). Real
breakthrough came in 1999 when the Government of India took a historic
decision to open the prospective gas and oil reserves areas to private
agencies (including the ONGC) for exploration under the New
Exploration Licensing Policy (NELP) though competitive bidding. The
award under NELP I,II, III, were given for 70 blocks covering an area
of 7,15,000 sq km. These awards covered 16 inland, 30 shallow water
and 24 deep water blocks over a period of three years. The fresh round
i.e. NELP-IV, was launched on 8.5.2003 for 24 blocks and final
awarding process completed in December, 2003. These 24 blocks
comprised of 11 inland, 12 deep water and one shallow water blocks. As
a result of exploration in 70 blocks (it is not yet complete), major
discoveries of gas reported so far are as below: 1. A major discovery
of gas was by Reliance in October, 2002, in Krishana Godavari basin
(KGB) 150 km, off the Andhra coast with initial estimated reserves of
300 BCM equivalent to 1.7 billion bausels 232 million tonnes of crude
oil. The find is estimated to come on stream in 2006-07. 2. CAIRN
Energy (Scottish company) also discovered oil and gas in Sarswati,
Guda and Rajeshwar wells in Barmer District of Rajasthan. These wells
were of moderate yield and total reserves could be 100 BCM. 3. The
CAIRN ENERGY, Tata Petro-dyne and ONGC consortium also discovered oil
and gas in four wells in the Gulf of Khambata (Gujarat) in 2000. These
four wells are Lakshmi, Gauri, Ambe and Parvati. These wells can
supply 80 MMSCD of gas for five years. 4. CAIRN ENERGY also made five
discoveries in K.G.Basin (2 gas, 2 oil and gas and one oil) with 200
millions barrels of oil equivalent. 5. Reliance Industries Limited
(RIL) and Gujarat State Petroleum Corporation Ltd. (GSPCL) have made
another significant gas discovery of oil and gas in an exploration
block in the shallow water of the gulf of Cambay (January, 2003). 6.
GAIL India has unearthed a new natural gas reserve in the off-shore
block A-I in Myanmar. This discovery has a potential of peak
production of 60 MMSCMD of gas for 20 years. 7. ONGC has launched a
multibillion dollar deep water exploration programme in the Arabian
Sea and Bay of Bengal code named Sagar Smiridhi. It plans to drill 47
exploratory wells to explore expected 11 billion tonnes of oil and gas
equivalent. Now equally important discovery of gas was in coal
fields. The ONGC knew about the presence of Coal Bed Melhame (CBM)
from long time but exploration started after 1999 only. It is
estimated that there might be 1000 BCM (ITCM) of CBM in India.
Therefore, the Government has expedited the process of awarding CBM
blocks separately. 1. Reliance made the second largest gas discovery
in two CBM blocks in Shahdol District of Madhya Pradesh. The gas
reserve are estimated to give a yield of 7-10 MMSCMD. 2. ONGC
discovered coal bed methane gas in exploratory wells (with a yield of
7000 m3/day each in Telgadia village) in Bokaro and Jharia blocks. The
blocks promise significant reservoir of methane gas. The real picture
of gas reserves will be known in next 2-3 years after results of all
the 94 exploratory blocks have arrived in full. Natural Grid for
Gas distribution: In order to transport gas from new discovery
sites and Dahej and Hazira terminals, new gas pipelines need to be
laid. The present HBJ pipeline has the capacity to transport 25 MMSCMD
gas imported from Qatar. The total absence of secondary distribution
lines has also come as a big road block for gas utilisation. Now, GAIL
is also contacting state governments to take up the work of laying
distribution lines within the cities to supply metered supply of gas
to domestic consumers. In fact, Gujarat is the first State to set up a
company known as Gujarat State Petronet Limited (GSPL). This company
is building a 1200-km gas grid within the state and a 200-km pipeline
is already operational. The GSPL grid is supplying around 5 MMSCMD of
gas to various consumers in the power, fertilizers and other
industrial sectors in the cities of Baroda and Surat. Therefore, GAIL
has formulated Natural Gas Grid Development Plan (NGGDP) to lay
7900-km long pipeline network by 2007-08 for linking various domestic
and cross border sources to the demand centres across the country.
(see map). Reliance is also upbeat to lay 2600 km of pipelines to
solve the transport problems. Once the grid plan becomes a reality,
the gas utilisation scenario in the country will be totally changed in
the next five years. Self Sufficiency: India is consuming only
80 MMSCMD of gas. The recent gas discoveries are no doubt heartening
but fresh discoveries do not indicate huge reserves (2800 BCM only) as
in the Arab countries or in Bangladesh we can at best consume 300
MMSCMD of gas for next 30 years which is four times the present level
of consumption. But 80 MMSCMD rate is hardly significant because it
serves a limited population of 10% to meet cooking and vehicular
requirement of fuel. The government has not precisely calculated so
far the rate of gas consumption required to meet cooking and vehicular
needs in total. Because of limited reserves, gas should be exclusively
used for catering to the cooking and vehicular needs and not for
generation of power. Power can be generated more cheaply from coal and
hydropower projects. Assuming that national grid is ready by 2008
simultaneously with secondary distribution lines in towns, the level
of gas consumption at the rate of 400 MMSCMD (300 MMSCMD from domestic
supplies and 100 MMSCMD from imports) will be fairly close to
self-sufficiency level during 30-40 years. But real self-sufficiency
will come when Bangladesh allows transportation of gas from Tripura to
West Bengal through its territory and starts selling gas to India from
its own huge reserves in Indian currency. This is because the gas
coming from Bangladesh will be utilised right in the adjoining states
and liquification (followed by regasification) will not be needed. |
UNDERSTANDING THE UNIVERSE
Why does the earth rotate in a clockwise direction: why not
anticlockwise? First of all, I will like to point out that in
actual fact the West to East rotation of the earth would appear to be
anti-clockwise when viewed from top of the North pole and clockwise
when viewed sitting on the South pole. (You might be able to check it
by looking at a rotating ball from the top and then from the bottom).
You may still ask why it is not the other way around. There is no law
that it has to be only the way it is. It just happened that in the
formation of the sun and the earth the rotation of the initial dust
cloud happened to be so. The angular momentum of the cloud was so
directed. There is nothing very deep in this happening. We can
balance a two-wheeler while riding. But we are unable to do so when it
is not moving. Why? If we push a standing bicycle with a great
force it can go quite some distance before it topples. It acquires a
degree of stability because of the angular momentum of the rotating
wheels. The need for conservation of angular momentum gives the
bicycle some stiffness against tilt. But this is not enough. The
bicycle does topple after a while. It is clear that a bicycle rider
and the bicycle together become a system capable of dynamic
equilibrium not accessible to a rider-less bicycle. In my view
learning to ride a bicycle is like becoming a coupled system with your
bike. You become involved, subconsciously, in correcting the tilts.
This is not very different from what you do while standing, walking or
running. You keep ensuring that your centre of gravity does not wander
far outside the vertical plane through the line joining the two
support points on the ground. When standing your support points are
the places where your two legs touch the ground. When pushed by
someone to the left your left foot shoots out to the left to keep your
centre of gravity in the middle. Similar movement of the right leg
occurs when pushed to the right. Thus you can go on walking and
running without realising that you are using a pretty sophisticated
control system you discovered when, as a baby, you learnt to stand and
walk. So what do you do when you have learnt to ride a bicycle? What
you have learnt is that if you are tilting to the right you turn the
handle bar slightly to the right and to the left when you are tilting
to the left. This action, coupled with the forward motion of the
bicycle moves the front wheel sideways to ensure that the composite
centre of gravity of you, the rider and the bike, falls between the
two points of support where the wheels touch the ground. This is a
dynamic process and you are not even aware of what you are doing. The
corrections required are larger when moving slowly and miniscule when
going fast — the slightest tilt of the bar can move the support
point sideways if you are going fast. I do not know how the inventor
of the bicycle knew that riders would be able to master this skill
only after a few falls! I still remember that while learning to ride a
bike more than 65 years ago my first few falls occurred when I kept
trying to correct a rightward tilt by trying to turn the handle bar to
the left. I cannot help drawing a lesson from what happens to us when
we acquire the automatic capability of control after learning to ride
a bicycle. We become a single organism without bicycle and the control
is only dynamic. This is also needed if we want to control an
institution, corporation or a country. True stability cannot be static
— we need to keep moving to achieve it. |