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Corrosion and it’s remedy

Corrosion and it’s remedy

In simple words corrosion is defined as ruination of material because of its reaction with environment. It should be made clear here that for corrosion material does not have to be metal only and this vast term is not restricted to metals alone. On the other hand ruination of wood, rubber and paint due to exposure to sunlight is also considered to be corrosion.
Stress Corrosion Cracking (S.C.C) happens when mechanical stresses occur in the presence of corrosive environment and this phenomenon can cause serious problems. It is common observation that corrosion is always detrimental but interesting fact is that in some cases corrosion is beneficial and desirable like while anodizing of aluminum used to obtain a protective corrosion product on the surface and uniform appearance.
Chemical machining is widely used in aircraft’s industry. In this process unmasked areas are subjected to acid treatment and excess metal is dissolved. This process is adopted in situations where parts are hard and difficult to machine. Analysis of corrosion in Oil & Gas industry is of prime importance because of two main reasons:
1. To maintain continued and extended production to avoid loss of revenue.
2. To avoid catastrophic failures of facilities and avoid irreparable loss of life.
To control corrosion many industries are spending several billion dollars so one can realize the devastation caused by this phenomenon. Corrosion can be classified as either Sour or Sweet depending upon environments. Usually sour corrosion is caused due to the presence of high sulphur contents and its compounds in oil and gas industry.
Most common corrodents are:
1. Acid gases
2. Brine
3. Aggressive soils
4. Anaerobic bacteria
To control corrosion following corrosion measures may be taken:
1. Chemical Inhibition
2. Chemical Control (removal of dissolved gas)
3. PH control
4. Oxygen Scavenging
5. Cathodic Protection
6. Thickness measurement (Ultrasonic thickness meter)
7. Control of physical factors (Shocks etc)
It is important to calculate cost effectiveness of any of corrosion control measures before applying it and this can be calculated only in case of proper monitoring, the effectiveness of corrosion control program can be judged only in case of its proper monitoring.
At the end in Oil and gas industry it is difficult to total elimination of corrosion one can feel comfortably satisfied if the rate of corrosion is retarded up to safe extend.

 

References:

http://www.npl.co.uk/upload/pdf/beginners_guide_to_corrosion.pdf

http://www.npl.co.uk/upload/pdf/basics_of_corrosion_control.pdf

http://www.ce.berkeley.edu/~paulmont/241/Corrosion.pdf

The Story of Oil Sand

The Story of Oil Sand

Is it possible to produce Oil from Sand? Yes!
Canada has 3rd largest Oil reserves in the World and 97% of Oil reserves are tapped in sand called “Oil Sand”. Out of “173 Billion Barrels” of oil reserves “167 Billion Barrels” are present in the Oil Sands.
So here Question comes what are Oil Sands?
Basically Oil Sands are naturally occurring mixture of “sand, clay, water and bitumen” lies in the category of Unconventional Petroleum deposits. According to National Energy Board of Canada Bitumen main component of oil sands which can be refined into diesel fuel is defined as “A highly viscous mixture of hydrocarbons heavier than pentanes which, in its natural state, is not usually recoverable at a commercial rate through a well because it is too thick to flow”.
Canada’s oil sands have drawn attention for more than 200 years. Historical background date back as far as 1715, when “James Knight”, wrote in his journal about “gum or pitch that flows out of the banks of a river” (The Athabasca). Efforts to exploit the oil sands resource began in the early 20th century.
Oil sands are recovered using two main technical methods:
1. Open Pit Mining
Large shovels scoop the oil sands into huge trucks which transfer it to crusher.
Large pieces of clay are broken down at crusher units.
Oil sand is then mixed with water & transported to plant via pipeline.
Bitumen is separated from other compounds.
Recovery rate through this process is 90% —— useful & cost-effective.
20% Oil sands are present close to earth’s surface.
2. In-Situ Drilling
In situ drilling accounts for 80% of oil sands reserves because mostly these reserves are located below 200ft from surface.
Advanced technology (Directional Drilling) is utilized to inject steam, combustion or other sources of heat into the reservoir which warms the bitumen so it can be pumped to the surface through recovery wells.
Majority of in situ operations are performed through steam-assisted gravity drainage, or SAGD.
Steam is pumped underground through a horizontal well to liquefy the bitumen, which is then pumped to the surface through a second recovery well.
Recovery rate is 50—65%
Another method is Cyclic Steam Stimulation in which steam is pumped down through a vertical well to liquefy the bitumen, which is then pumped to the surface through the same well.
Recovery rate is 30—-40%.
Crude oil which is derived from the oil sands is usually sent to refineries across North America to make gasoline, diesel, aviation fuel and other consumer products and then utilized commercially.

http://www.oilsandstoday.ca/whatareoilsands/Pages/RecoveringtheOil.aspx
http://www.oilsandstoday.ca/whatareoilsands/Pages/History.aspx
http://www.oilsandstoday.ca/whatareoilsands/Pages/QuickFacts.aspx
http://www.oilsandstoday.ca/whatareoilsands/Uses/Pages/default.aspx
http://www.canadiangeographic.ca/magazine/jun08/feature_tar_sands.asp
Image Source Oilandgasiq.com

Historical Background of exploration in Pakistan

Historical Background of exploration in Pakistan

If we talk about first exploratory well which was drilled in the region of undivided sub-continent (now Pakistan) then facts highlighted that it was drilled in1866 by Punjab Oriental State, right after seven years of World’s 1st well drilled in USA to a depth of 65ft.
With the passage of time, discovery of oil in province of Balochistan was the main success where thirteen shallow wells produced 25,000 barrels of oil between 1885 and 1892. Here one fact should be made clear that during this early phase all the drilling activities were controlled by The Government of Indio-Pak.
Unfortunately, they were unable to find such a reserve which exhibit commercial storage until 1910. Later on Attock Oil Company (AOC) made a first commercial oil discovery (4.31 MMbo) in 1915, in Punjab province. This achievement leads to attract many exploration companies to utilize their investment in region of sub-continent. As consequences three oil fields were established consecutively in 1936, 1944 and 1946 by joint venture of Attock Oil company (AOC) and Burmah Oil Company (BOC).
After the independence of Pakistan in 1947, the Government of Pakistan issued Regulation of Mines and Oilfields and Mineral Development Act 1948 and classified rules under this Act in 1949. The main objective of this Act was to provide regulatory authority to encourage and accelerate petroleum exploration and production activities in the country.
BOC and AOC transferred its exploration activities to local companies, by establishing Pakistan Petroleum Limited (PPL) and Pakistan Oilfields Limited (POL) respectively.
After establishment of PPL & POL, a well drilled on the Sui structure (located in Balochistan Province), made the inaugural discovery of one of the largest reserves of natural gas and recoverable reserves were estimated to be over 10 trillion cubic feet (TCF) which is equivalent to about 1 billion barrels of oil. This discovery was a milestone towards the development & prosperity of petroleum industry in Pakistan which made numerous E&P companies attentive towards this part of globe.
In order to drill more exploratory wells in prospective areas, permits were issued to Standard Vacuum Oil Company (1954), Hunt International Oil Company (1955), Shell Oil Company (1956), Sun Oil Company (1957) and Tidewater (1958) respectively by the Government of Pakistan which led to further discoveries of natural gas reserves.
In spite of new gas discoveries during this time frame, the exploration activities towards the oil discoveries exhibit negative trend.
By keeping this trend in focus Government of Pakistan decided to establish the state oil exploration company and in 1961 a joint stock company under the name of Oil and Gas Development Company Limited (OGDCL) was established which expands moving scheme of prosperous profile with the small gas discovery at Sindh province in 1965, followed by discovery of oil reserve at Potwar region of Punjab in 1968.
Later on gas reserve at Sindh in 1970, Punjab in 1972, then Sindh in 1973 and gas/ condensate at Punjab in 1975 were discovered by the same company.
Meanwhile POL discovered oil at Punjab province in 1968 and American Oil Company (AMOCO) discovered a small gas accumulation at Balochistan province in 1975.
After the modification of petroleum regulations in 1976, British Petroleum a USA Company came to Pakistan and started its activities and has drilled 65 discovery wells in Pakistan.
This opened a new oil province and broke the tradition in the north region. After Sui (Balochistan), the discovery of oil in the Southern Basin was the second milestone in search for hydrocarbons in Pakistan and this area has attained the distinction of contributing 59% of the total oil production of the country.
Following journey of success OGDCL discovered a large gas storage in Eocene Carbonates of Middle Indus Basin in 1989 and fortunately in the same year, Eni made a gas discovery in Sandstone (Cretaceous) in south region lead to discover number of significant gas reserves in 1993 and then in 1998 by OMV of Austria followed by Mari Gas Company Ltd (MGCL) in 1999, in 2002 Petronas of Malaysia provide its services to reveal hydrocarbon bearing zones.
North Frontier Province of Pakistan (NWFP) deviates attention of industrial progress when MOL of Hungry in 2002 and as well as in 2005 made discovery of reserves which has reinforced the belief of many Geologist that this region can host large hydrocarbon reserves and recently nine blocks have been awarded in this province.
Offshore exploration which had started in 1961 remained limited to the drilling of only eleven exploratory wells due to lack of success and high drilling cost.
Current statistics reveals that only four blocks in the offshore region are held under license, two by Total, one by Shell and the fourth one is by British Gas.

Sources

http://environment.gov.pk/act-rules/G-Petroleum%20Onshore%20Vol%201-Annexures.pdf
http://www.ppepca.com/aboutppepca.html
http://http://www.papg.org.pk/ehis.asp
http://http://www.mpnr.gov.pk/gop/index.php?q=aHR0cDovLzE5Mi4xNjguNzAuMTM2L21wbnIvZnJtRGV0YWlscy5hc3B4P29wdD1taXNjJmlkPTc%3D
Image: Courtesy naturalgasasia.com