The Kuwaiti oil fires were caused by "Iraqi "military forces setting fire to a reported 605 to 732 "oil wells along with an unspecified number of oil filled low-lying areas, such as oil lakes and fire "trenches, as part of a "scorched earth policy while retreating from "Kuwait in 1991 due to the advances of "Coalition military forces in the "Persian Gulf War. The fires were started in January and February 1991, and the first "well fires were extinguished in early April 1991, with the last well capped on November 6, 1991.
In addition, Kuwait had been producing oil above treaty limits established by "OPEC. By the eve of the Iraqi invasion, Kuwait had set production quotas to almost 1.9 million barrels per day (300,000 m3/d), which coincided with a sharp drop in the price of oil. By the summer of 1990, Kuwaiti overproduction had become a serious point of contention with Iraq.
Some analysts have speculated that one of "Saddam Hussein's main motivations in invading Kuwait was to punish the ruling "al-Sabah family in Kuwait for not stopping its policy of overproduction, as well as his reasoning behind the destruction of said wells.
It is also hypothesized that Iraq decided to destroy the oil fields to achieve a military advantage, believing the intense smoke plumes serving as "smoke screens created by the burning oil wells would inhibit Coalition offensive "air strikes, foil allied "precision guided weapons and spy satellites, and could screen Iraq’s military movements. Furthermore, it is thought that Iraq’s military leaders may have regarded the heat, smoke, and debris from hundreds of burning oil wells as presenting a formidable "area denial obstacle to Coalition forces. The onset of the oil well destruction supports this military dimension to the sabotage of the wells; for example, during the early stage of the Coalition air campaign, the number of oil wells afire was relatively small but the number increased dramatically in late February with the arrival of the ground war.
The Iraqi military "combat engineers also released oil into low-lying areas for defensive purposes against infantry and "mechanized units along Kuwait’s southern border, by constructing several "fire trenches" roughly 1 kilometer long, 3 meters wide, and 3 meters deep to impede the advance of Coalition ground forces.
The military use of the land based fires should also be seen in context with the coinciding, deliberate, sea based "Gulf War oil spill, the apparent strategic goal of which was to foil a potential "amphibious landing by US "Marines.
As an international coalition under United States command assembled in anticipation of an invasion of Iraqi-occupied Kuwait, the Iraqi regime decided to destroy as much of Kuwait's oil reserves and infrastructure as possible before withdrawing from that country. As early as December 1990, Iraqi forces placed explosive charges on Kuwaiti oil wells. The wells were systematically sabotaged beginning on January 16, 1991, when the allies commenced air strikes against Iraqi targets. On February 8, satellite images detected the first smoke from burning oil wells. The number of oil fires peaked between February 22 and 24, when the allied ground offensive began.
According to the "U.S. Environmental Protection Agency's report to "Congress, "the retreating Iraqi army set fire to or damaged over 700 oil wells, storage tanks, refineries, and facilities in Kuwait." Estimates placed the number of oil well fires from 605 to 732. A further thirty-four wells had been destroyed by heavy coalition bombing in January. The Kuwait Petroleum Company's estimate as of September 1991 was that there had been 610 fires, out of a total of 749 facilities damaged or on fire along with an unspecified number of oil filled low-lying areas, such as "oil lakes" and "fire "trenches". These fires constituted approximately 50% of the total number of oil well fires in the "history of the petroleum industry, and damaged or destroyed approximately 85% of the wells in every major Kuwaiti oil field.
Concerted efforts to bring the fires and other damage under control began in April 1991. During the uncontrolled burning phase from February to April, various sources estimated that the burning wellheads burnt through between four and six million "barrels of crude oil, and between seventy and one hundred million "cubic meters of natural gas per day. Seven months later, 441 facilities had been brought under control, while 308 remained uncontrolled. The last well was capped on November 6, 1991. The total amount of oil burned is generally estimated at about one billion barrels. Daily global oil consumption in 2015 is about 91.4 million barrels; the oil lost to combustion would last 11 days at modern usage rates.
On March 21, 1991, a Royal Saudi Air Force "C-130H crashed in heavy smoke due to the Kuwaiti oil fires on approach to "Ras Mishab Airport, "Saudi Arabia. 92 Senegalese soldiers and 6 Saudi crew members were killed, the largest accident among Coalition forces.
The smoke screening was also used by Iraqi anti-armor forces to a successful extent in the "Battle of Phase Line Bullet, having aided in achieving the element of surprise against advancing "Bradley (IFV)s, along with increasing the general "fog of war.
The fires burned out of control because of the dangers of sending in firefighting crews during the war. "Land mines had been placed in areas around the oil wells and military "demining was necessary before the fires could be put out. Around 5 million barrels (790,000 m3) of oil were lost each day. Eventually, privately contracted crews extinguished the fires, at a total cost of "US$1.5 billion to Kuwait. By that time, however, the fires had burned for approximately ten months, causing widespread pollution.
The fires have been linked with what was later deemed "Gulf War Syndrome, a chronic disorder afflicting military veterans and civilian workers that include fatigue, muscle pain, and cognitive problems; however, studies have indicated that the firemen who capped the wells did not report any of the symptoms that the soldiers experienced. The causes of Gulf War Syndrome have yet to be been determined.
From the perspective of ground forces, apart from the occasional "oil rain" experienced by troops very close to spewing wells, one of the more commonly experienced effects of the oil field fires were the ensuing smoke "plumes which rose into the atmosphere and then "precipitated or fell out of the air via "dry deposition and by rain. The pillar-like plumes frequently broadened and joined up with other smoke plumes at higher altitudes, producing a cloudy grey "overcast effect, as only about 10% of all the fires corresponding with those that originated from "oil lakes" produced pure black "soot filled plumes, 25% of the fires emitted white to grey plumes, while the remainder emitted plumes with colors between grey and black. For example, one Gulf War veteran stated:
It was like a cloudy day all day long, in fact, we didn’t realize it was smoke at first. The smoke was about 500 feet above us, so we couldn’t see the sky. However, we could see horizontally for long distances with no problem. We knew it was smoke when the mucous from our nostrils started to look "black..."
A paper published in 2000 analyzed the degree of exposure by troops to "particulate matter, which included soot but the paper focused more-so on "silica sand, which can produce "silicosis. The paper included troop medical records, and in its conclusion: "A literature review indicated negligible to nonexistent health risk from other inhaled particulate material(other than silica) during the Gulf War".
The burning wells needed to be extinguished as, without active efforts, Kuwait would lose billions of dollars in oil revenues. It was predicted that the fires would burn from two to five years before losing pressure and going out on their own, optimists estimating two years and pessimists estimating five while the majority estimated three years until this occurred.
The companies responsible for "extinguishing the fires initially were "Bechtel, "Red Adair Company (now sold off to Global Industries of "Louisiana), "Boots and Coots, and "Wild Well Control. "Safety Boss was the fourth company to arrive but ended up extinguishing and capping the most wells of any other company: 180 of the 600. Other companies including Cudd Well/Pressure Control, Neal Adams Firefighters, and Kuwait Wild Well Killers were also contracted.
According to Larry H. Flak, a petroleum engineer for Boots and Coots International Well Control, 90% of all the 1991 fires in Kuwait were put out with nothing but sea water, sprayed from powerful hoses at the base of the fire. The water supply to the arid desert region was supplied by re-purposing the "oil pipelines that prior to the arson attack, pumped oil to the "Persian Gulf, the pipeline was mildly damaged and once repaired its flow was reversed to pump Persian gulf "seawater to the burning oil wells. The extinguishing rate was approximately 1 every 7–10 days at the start of efforts but then with experience gained and the removal of the "mine fields that surrounded the burning wells, the rate increased to 2 or more per day.
Safety Boss' use of their own "Smokey" Series Firetrucks was unique and allowed for much quicker extinguishing of wells.["citation needed] This was the primary reason for their quick outpacing of other companies' efforts. The Emir of Kuwait rewarded Safety Boss with the extinguishing of the last well on the Project in November 1991.["citation needed]
For stubborn "oil well fires, the use of a "gas turbine to blast a large volume of water at high velocity at the fire proved popular with firefighters in Kuwait and was brought to the region by Hungarians equipped with "MiG-21 engines mounted originally on a "T-34 (later replaced with "T-55) tank, called Big wind. It extinguished 9 fires in 43 days.
In fighting a fire at a directly vertical spewing "wellhead, "high explosives, such as "dynamite were used to create a "blast wave that pushes the burning fuel and local atmospheric oxygen away from the well. (This is a similar principle to blowing out a candle.) The flame is removed and the fuel can continue to spill out without igniting. Generally, explosives were placed within "55 gallon drums, the explosives surrounded by "fire retardant chemicals, and then the drums are wrapped with insulating material with a horizontal crane being used to bring the drum as close to the burning area as possible.
The fires were the subject of a 1992 "IMAX "documentary film, "Fires of Kuwait, which was nominated for an "Academy Award. The film includes footage of the Hungarian team using their jet turbine extinguisher.
"Lessons of Darkness is a 1992 film by director Werner Herzog that explores of the ravaged oil fields of post-Gulf War Kuwait.
Betchel Corporation produced a short documentary titled Kuwait: Bringing Back the Sun that summarizes and focuses upon the fire fighting efforts, which were dubbed the Al-Awda ("Arabic for "The Return") project.
Immediately following Iraq’s invasion of Kuwait, predictions were made of an environmental disaster stemming from Iraqi threats to blow up captured Kuwaiti oil wells. Speculation ranging from a "nuclear winter type scenario, to heavy "acid rain and even short term immediate "global warming were presented at the "World Climate Conference in Geneva that November.
On January 10, 1991, a paper appearing in the Journal Nature, stated "Paul Crutzen's calculations that the setting alight of the Kuwait oil wells would produce a ""nuclear winter", with a cloud of smoke covering half of the "Northern Hemisphere after 100 days had passed and beneath the cloud, temperatures would be reduced by 5-10 Celsius. This was followed by articles printed in the "Wilmington morning star and the "Baltimore Sun newspapers in mid to late January 1991, with the popular TV scientist personality of the time, "Carl Sagan, who was also the co-author of the first few "nuclear winter papers along with "Richard P. Turco, John W. Birks, "Alan Robock and "Paul Crutzen together collectively stated that they expected catastrophic "nuclear winter like effects with continental sized impacts of "sub-freezing" temperatures as a result of if the Iraqis went through with their threats of igniting 300 to 500 pressurized oil wells and they burned for a few months.
Later when "Operation Desert Storm had begun, Dr. "S. Fred Singer and "Carl Sagan discussed the possible environmental impacts of the Kuwaiti petroleum fires on the "ABC News program "Nightline. Sagan again argued that some of the effects of the smoke could be similar to the effects of a "nuclear winter, with smoke lofting into the "stratosphere, a region of the "atmosphere beginning around 43,000 feet (13,000 m) above sea level at Kuwait, resulting in global effects and that he believed the net effects would be very similar to the explosion of the Indonesian volcano "Tambora in 1815, which resulted in the year 1816 being known as the "Year Without a Summer.
He reported on initial modeling estimates that forecast impacts extending to south Asia, and perhaps to the northern hemisphere as well. Singer, on the other hand, said that calculations showed that the smoke would go to an altitude of about 3,000 feet (910 m) and then be rained out after about three to five days and thus the lifetime of the smoke would be limited. Both height estimates made by Singer and Sagan turned out to be wrong, albeit with Singer's narrative being closer to what transpired, with the comparatively minimal atmospheric effects remaining limited to the Persian Gulf region, with smoke plumes, in general, lofting to about 10,000 feet (3,000 m) and a few times as high as 20,000 feet (6,100 m).
Along with Singer's televised critique, Richard D. Small criticized the initial Nature paper in a reply on March 7, 1991 arguing along similar lines as Singer.
Sagan later conceded in his book "The Demon-Haunted World that his prediction did not turn out to be correct: "it was pitch black at noon and temperatures dropped 4–6 °C over the Persian Gulf, but not much smoke reached stratospheric altitudes and Asia was spared."
At the peak of the fires, the smoke absorbed 75 to 80% of the sun’s radiation. The particles rose to a maximum of 20,000 feet (6,100 m), but were "scavenged by "cloud condensation nuclei from the atmosphere relatively quickly.
Sagan and his colleagues expected that a "self-lofting" of the sooty smoke would occur when it absorbed the sun's heat radiation, with little to no scavenging occurring, whereby the black particles of soot would be heated by the sun and lifted/lofted higher and higher into the air, thereby injecting the soot into the stratosphere where it would take years for the sun blocking effect of this "aerosol of soot to fall out of the air, and with that, catastrophic ground level cooling and agricultural impacts in Asia and possibly the "Northern Hemisphere as a whole.
In retrospect, it is now known that smoke from the Kuwait oil fires only affected the weather pattern throughout the Persian Gulf and surrounding region during the periods that the fires were burning in 1991, with lower atmospheric winds blowing the smoke along the eastern half of the Arabian Peninsula, and cities such as "Dhahran and "Riyadh, and countries such as "Bahrain experienced days with smoke filled skies and carbon "soot rainout/fallout.
Thus the immediate consequence of the arson sabotage was a dramatic regional decrease in "air quality, causing respiratory problems for many Kuwaitis and those in neighboring countries.
According to the 1992 study from "Peter Hobbs and Lawrence Radke, daily emissions of "sulfur dioxide (which can generate "acid rain) from the Kuwaiti oil fires were 57% of that from electric utilities in the United States, the emissions of "carbon dioxide were 2% of global emissions and emissions of "soot reached 3400 metric tons per day.
In a paper in the "DTIC archive, published in 2000, it states that "Calculations based on smoke from Kuwaiti oil fires in May and June 1991 indicate that "combustion efficiency was about 96% in producing "carbon dioxide. While, with respect to the incomplete combustion fraction, Smoke "particulate matter accounted for 2% of the fuel burned, of which 0.4% was soot."[With the remaining 2%, being oil that did not undergo any initial combustion].
Peter V. Hobbs also narrated a short amateur documentary titled Kuwait Oil Fires that followed the "University of Washington/UW's "Cloud and Aerosol Research Group" as they flew through, around and above the smoke clouds and took samples, measurements, and video of the smoke clouds in their "Convair C-131(N327UW) Aerial laboratory.
Although scenarios that predicted long-lasting environmental impacts on a global atmospheric level due to the burning oil sources did not transpire, long-lasting ground level "oil spill impacts were detrimental to the environment regionally.
Forty-six oil wells are estimated to have gushed, and before efforts to cap them began, they were releasing approximately 300,000-400,000 barrels of oil per day, with the last "gusher being capped occurring in the latter days of October 1991.
The Kuwaiti Oil Minister estimated between twenty-five and fifty million barrels of unburned oil from damaged facilities pooled to create approximately 300 oil lakes, that contaminated around 40 million tons of sand and earth. The mixture of desert sand, unignited oil spilled and "soot generated by the burning oil wells formed layers of hard "tarcrete", which covered nearly five percent of Kuwait's land mass. 
Cleaning efforts were led by the "Kuwait Institute for Scientific Research and the Arab Oil Co., who tested a number of technologies including the use of "petroleum-degrading bacteria on the oil lakes.
Vegetation in most of the contaminated areas adjoining the oil lakes began recovering by 1995, but the dry climate has also partially solidified some of the lakes. Over time the oil has continued to sink into the sand, with potential consequences for Kuwait's small groundwater resources.
The land based Kuwaiti oil spill surpassed the "Lakeview Gusher, which spilled nine million pounds in 1910, as the largest oil spill in recorded history.
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The fears expressed last week centred around the cloud of soot that would result if Kuwait’s oil wells were set alight by Iraqi forces ... with effects similar to those of the “nuclear winter” ... Paul Crutzen, from the Max Planck Institute for Chemistry in Mainz, has produced some rough calculations which predict a cloud of soot covering half of the Northern Hemisphere within 100 days. Crutzen ... estimates that temperatures beneath such a cloud could be reduced by 5-10 degrees C
16,000 metric tons of actual soot is produced from 220,000 metric tons of oil burned every day. ‘My estimates of the smoke produced by destruction of Kuwait’s oil wells and refineries and the smoke stabilization altitude do not support any of the purported impacts. The smoke is not injected high enough to spread over large areas of the Northern Hemisphere, nor is enough produced to cause a measurable temperature change or failure of the monsoons.