Petroleum – Oil And Natural Gas

Oil and natural gasoline collectively make petroleum. Petroleum, which is Latin for rock oil, is a fossil gas, that means it was made naturally from decaying prehistoric plant and animal stays. It is a mixture of hundreds of different hydrocarbons molecules containing hydrogen and carbon that exist generally as a liquid (crude oil) and typically as a vapor (natural gas).

How is Petroleum Formed?

Oil and pure gas have been formed from the remains of prehistoric plants and animals—that’s why they’re known as fossil fuels. Lots of of tens of millions of years ago, prehistoric plant and animal remains settled into the seas along with sand, silt and rocks. Because the rocks and silt settled, layer upon layer piled up in rivers, alongside coastlines and on the sea backside trapping the natural material. Without air, the organic layers could not rot away. Over time, growing strain and temperature changed the mud, sand and silt into rock (referred to as supply rock) and slowly “cooked the organic matter into petroleum. Petroleum is held inside the rock formation, similar to how a sponge holds water.

Over thousands and thousands of years, the oil and gasoline that formed in the source rock deep within the Earth moved upward via tiny, linked pore areas in the rocks. Some seeped out on the Earth’s floor, however most of the petroleum hydrocarbons have been trapped by nonporous rocks or other barriers. These underground traps of oil and fuel are known as reservoirs. Contrary to popular false impression, reservoirs should not underground “lakes of oil; they’re made up of porous and permeable rocks that may hold important amounts of oil and fuel within their pore spaces. Some reservoirs are a whole lot of ft under the floor, while others are 1000’s of toes underground.

How is Petroleum Found?

From historical instances via the early 1900s, discovering oil and fuel was largely a matter of luck. Early explorers regarded for oil seeps on the surface, certain kinds of rock outcrops and different surface indicators that oil might exist below ground. This was successful-or-miss process. But science and technology rapidly developed to enhance the industry’s means to find out what lies below the bottom.

Geologists research rocks on the Earth’s floor and underground. They make a map of the rocks where they suppose oil and gas could be discovered. Engineers use this geology map to drill a well below the Earth’s floor. If successful, the properly will bring a gradual movement of oil and gas to the surface. After the drill rig is removed, a pump is positioned on the well head. An electric motor drives a gear box that strikes a lever. The lever pushes and pulls, forcing the pump up and down, and creates a suction that pulls up the oil.

Three factors affect the quantity of oil or gasoline that may be recovered from a identified reservoir: rock properties, expertise and economics. Whereas the business can not change the properties of the rock, it will probably develop new methods to take away extra oil from the rock. The business has also made important advances to boost recovery from known reservoirs within the US and abroad, adding to the reserves base.

Where is Petroleum Discovered?

The oil and pure gasoline that power our houses, companies and transportation are present in small spaces called pores between layers of rock deep throughout the Earth. Many offshore wells, for instance, are drilled in hundreds of toes of water and penetrate tens of thousands of toes into the sediments below the sea ground. The oil is then transported to refineries and distilled into fuel or base chemical merchandise.

Greater than 100 international locations produce petroleum. Most of those nations produce each oil and pure fuel; just a few produce solely natural fuel. Pure fuel is normally found near petroleum.

Many elements can affect oil manufacturing, similar to civil unrest, national or international politics, adherence to quotas, oil costs, oil demand, new discoveries and technology development or utility.

The larger subsurface traps are the simplest deposits of oil and gas to locate. In mature manufacturing areas of the world, most of these giant deposits of oil and gas have already been discovered, and lots of have been producing because the 1960s and 1970s. The oil and gas industry has developed new expertise to higher identify and entry oil and gasoline:

– Improved seismic strategies (reminiscent of 3D seismic) have elevated the odds of correctly figuring out the location of smaller and tougher to find reservoirs.
– New drilling strategies can intersect an extended, thin reservoir horizontally first that then turns vertically making an “L form. This allows the oil or gas from the reservoir to be recovered with fewer wells.

World oil manufacturing comes from more than 800,000 oil wells. Greater than 500,000 of these wells are within the United States, which has some of the most mature producing basins on the planet. On average, an oil effectively in the US produces only 10 B/D, compared with 248 B/D in Russia, 3,077 B/D in Norway, and 5,762 B/D for a effectively in Saudi Arabia. Comparable data for pure gasoline wells are not readily available.

There are still many oil and gasoline reserves left to be found and produced. Future discoveries will be in deeper basins and in additional remote areas of the earth. Advanced technologies also can be used to find small reservoirs present in current oil and gas areas.

Largest Oil Reserves by Nation – 1 January 2010

Pure Gas: Oil Byproduct, Useful Resource

Natural-gasoline use is rising across all financial sectors. Ceramic cross Pure gas burns cleaner than oil or coal, and this environmental profit has inspired its use. Whereas many years in the past pure gasoline was seen as an undesirable byproduct of oil and may have been wasted, its worth has been recognized immediately. Most pure gas is distributed by pipelines, which is a limiting issue for distant resources that are not close to the most important consuming markets. But there is considerable improvement of expertise to convert natural gas to liquids to enable extra widespread transportation.

Largest Natural Gas Reserves by Country – 1 January 2009

New Exploration Strategies for Oil and Fuel

Within the unrelenting search for more oil and gasoline, innovation performs an unquestionable function. As giant oil and gas fields become increasingly difficult to search out, geologists, geophysicists and engineers employ new technologies, resembling seismic, to uncover resources that just 10 years in the past had been unimaginable. Seismic is a expertise that bounces sound waves off rock formations deep under the floor of the Earth to supply explorers with a picture of the subsurface, often revealing areas the place oil and gasoline may be trapped. The expertise of discovering oil has even incorporated 3D visualization instruments from Microsoft’s Xbox recreation console! The system will help geoscientists examine and interact with 3D fashions of the Earth.

In order to process the massive quantities of knowledge collected from seismic surveys, mathematicians, physicists and different scientists are continuously developing new computer algorithms to search out advanced patterns that improve our understanding of the land beneath us. If we are to proceed discovering new fields hidden deep inside the Earth, breakthroughs in laptop processing power and data management are crucial.

How Will we Get to the Oil?

The oil and pure gas we use immediately have been trapped deep inside the Earth for hundreds of thousands of years. Although it is tempting to consider oil and gasoline reservoirs as large pools and wells with giant straws that suck the fluid to the surface, oil and fuel is definitely locked contained in the rocks like water in a sponge. Simply just like the small holes in a sponge that gather and hold water, there are tiny spaces or pores in rocks that fill with oil and gasoline. For the previous one hundred years, oil and fuel was extracted from rocks with small pores that had been nonetheless huge enough that the fluids flowed easily. If you had been a tiny molecule of oil, flowing via these rocks could be like driving on a freeway in the categorical lane. During this time interval, geologists and engineers knew about different massive portions of hydrocarbons trapped in rocks with even smaller and more advanced pores, but were unable to harness the resource—the oil and gasoline flowed too slowly or not in any respect from these rocks. As a substitute of driving on a big and fast freeway, flowing by means of these rocks could be like driving on a small two-lane street with many stoplights and intersections. Standard gas wells drilled into these formations were thought-about uneconomic since the gas locked in the rock would stream out of the tiny pores in the rock at such low rates. This picture changed, and changed in a big manner, with the advent of stimulated horizontal wells.

Drilling Location

Earlier than the expertise advances of the previous few many years, the best place to put a well was immediately above the anticipated location of the oil or gasoline reservoir. The properly would then be drilled vertically to the targeted oil or fuel formation. Technology now allows the industry to drill directionally from a site as much as 5 miles (8 km) away from the goal space. Engineers can even target an area the dimensions of a small room more than a mile underground! This directional drilling technology means that the industry can avoid putting wells in environmentally delicate areas or different inaccessible areas but still entry the oil or gas that lies under those areas.

Drilling Course of

In simplified terms, the drilling course of uses a motor, both on the surface or downhole, to turn a string of pipe with a drill bit related to the tip. The drill bit has particular “teeth to assist it crush or break up the rock it encounters to make a gap in the ground. While the effectively is being drilled, a fluid, known as drilling mud, circulates down the inside of the drill pipe, passes through holes within the drill bit and travels again up the wellbore to the surface. The drilling mud has two purposes:

– To hold the small bits of rock, or cuttings, from the drilling process to the floor so they can be removed.
– To fill the wellbore with fluid to equalize pressure and prevent water or different fluids in underground formations from flowing into the wellbore during drilling.

Water-based drilling mud is composed primarily of clay, water and small quantities of chemical additives to address explicit subsurface situations which may be encountered. In deep wells, oil-based mostly drilling mud is used as a result of water-primarily based mud can not stand as much as the upper temperatures and circumstances encountered. The petroleum business has developed applied sciences to reduce the environmental effects of the drilling fluids it makes use of, recycling as a lot as attainable. The event of environmentally pleasant fluids and additives is an important area of analysis of the oil and gasoline trade.

Even with the very best expertise, drilling a properly doesn’t at all times imply that oil or fuel might be discovered. If oil or gasoline just isn’t found in business portions, the well is called a dry hole. Typically, the effectively encounters oil or gasoline, but the reservoir is decided to be unlikely to provide in commercial quantities.

Technology has elevated the success charge of finding commercial oil or fuel deposits with much less waste and a smaller impact on the surface. Whereas standard oil and gasoline wells are sometimes vertical, contacting solely a limited quantity of the goal reservoir rock, horizontal wells seem like a large “L. The long horizontal wellbore, sometimes greater than 4,000 ft long, contacts a big portion of the productive reservoir. The surrounding rock formation is then hydraulically fractured to launch the oil or fuel trapped inside. In hydraulic fracturing, huge trucks pump 1000’s of gallons of fluid into the rock at very high pressures as a way to pressure the rock to crack. These cracks are then propped open with sand to permit a highly conductive passage via which the oil or gas can circulation.

In shale fields, as many as 15 major fractures are positioned along the horizontal wellbore, serving to connect all those small two-lane roads to wide boulevards and even larger, quicker highways. Presently, the bounds of this know-how are being pushed again every day in an effort to unleash giant fuel sources. In the future, this technology will have to go even farther to permit more fractures and longer horizontal wells. Advances in this area will undoubtedly rework our vitality landscape.

For extra info on shale gas and horizontal drilling, see Trendy Shale Gas: A Primer from the U.S. Division of Energy.

Drilling Costs

As soon as a company identifies the place the oil or gasoline could also be positioned, it then begins planning to drill an exploratory well. Drilling a nicely is expensive: Shallow offshore wells or deep onshore wells can value greater than $15 million every to drill!

Getting the Oil Out

Locating an acceptable site for drilling is simply the first step in extracting oil. Earlier than drilling can start, firms must be sure that they’ve the legal proper to drill, and that the impression of drilling on the surroundings is acceptable. This could take years. As soon as they finally have the go ahead, drilling begins. The precise procedure varies, however the thought is first to drill down to only above where the oil is positioned. Then they insert a casing of concrete into the newly drilled gap to make it stronger. Subsequent, they make little holes within the casing close to the underside, which can let oil in, and top the properly with a particular assembly of control and safety valves known as a “Christmas tree. Finally, they could ship down acid or pressurized sand to interrupt by way of the last layer of rock and begin the oil flowing into the effectively. (Source: Oil and Natural Fuel, Society of Petroleum Engineers, Richardson, TX.)

Within the petroleum trade, manufacturing is the phase of operation that offers with bringing well fluids to the floor and preparing them for his or her trip to the refinery or processing plant. Manufacturing begins after drilling is completed.

The first step is to complete the properly – that’s, to carry out whatever operations are obligatory to start the well fluids flowing to the floor. Routine maintenance operations, corresponding to replacing worn or malfunctioning equipment – referred to as servicing – are standard through the well’s producing life. Later in the life of the effectively, more extensive repairs – often known as workovers – could even be crucial to maintain the movement of oil and fuel. The fluids from a nicely are often a mixture of oil, gasoline, and water, which should be separated after coming to the floor. Production also consists of disposing of the water and installing equipment to treat, measure, and take a look at the oil and gasoline before they’re transported away from the nicely site.

So manufacturing is a combination of operations: bringing fluids to the floor; doing no matter is important to keep the nicely producing; and taking fluids through a series of steps to purify, measure, and test them. (Source: Fundamentals of Petroleum, Petroleum Extension Service, The College of Texas at Austin, Austin TX)

Extremely-deep Water Operations

A major impediment to producing tomorrow’s oil and gas resources is operation in extremely-deep water. The frontier of oil exploration continues to be offshore, over 10,000 ft/3,048 meters under sea degree. Working on this atmosphere requires billions of dollars and boundless technical expertise. Safely and economically bringing oil to the floor requires consultants in the whole lot from underwater autos that set up subsea gear to structural engineers that make sure the huge floating platforms can withstand giant waves. Operators must have the ability to hit a seemingly tiny target that they can not see over 30,000 feet/9,144 meters under the surface—all whereas floating on waves. To place this in perspective, it’s a bit like a quarterback attempting to throw a soccer to his huge receiver more than 100 soccer fields away! Innovation will continue to drive this frontier into new territory.

Environmental Care

We depend on oil and gas for a bunch of products we use in our everyday lives, and we will proceed to depend upon them for years to come. And while oil and fuel manufacturing could contribute to the greenhouse impact on the setting, the business is doing its part to offset these effects whereas nonetheless assembly the world’s petroleum calls for.

Already great strides have been made to ensure that oil and fuel producers make as little impact as attainable on the pure environments by which they function. This includes drilling a number of wells from a single location or pad to reduce damages to the floor, using environmentally sound chemicals to stimulate effectively production, and guaranteeing a seamless transition from the wellhead to the patron. While conventional oil and gasoline operations have been streamlined to maximize human safety and environmental protection, growth of unconventional sources like Canada’s oil sands and Colorado’s oil shale would require major technological improvements.

Exploitation of these resources will likely be necessary in meeting tomorrow’s vitality demand, but present methods devour giant quantities of water and rely on expansive floor operations. How can the huge potential locked in these resources be tapped in a extra environment friendly, environmentally sound method? Research right this moment focuses on inserting heaters into rock formations under the floor to convert the heavy hydrocarbons into liquid that can then be drained and produced by more typical oil wells. Such a course of would dramatically scale back the impression of these unconventional sources on the floor. Nonetheless, the subsequent generation of engineers and scientists must further refine this expertise or generate new concepts to be able to tackle these issues.

Are We Operating Out of Oil and Gas?

International locations with Largest Identified Oil Reserves

– Saudi Arabia
– Canada
– Iran
– Iraq
– Kuwait
– United Arab Emirates
– Venezuela
– Russia
– Libya
– Nigeria

Extra Info»

Nobody can know for certain how a lot oil and fuel stays to be found. However geologists generally make educated guesses.

The entire quantity of oil or gas in the reservoir is named authentic oil, or fuel. For a selected reservoir, engineers estimate this amount utilizing details about the dimensions of the reservoir entice and properties of the rock. A few of the original oil and gas deposited hundreds of thousands of years in the past has been found, while some stays undiscovered—the goal of future exploration.

Discovered (or recognized) resources may be divided into proved reserves and potential or unproved (possible and potential) resources.

– Proved reserves are the portions of oil or fuel from identified reservoirs which might be anticipated to be recoverable with present know-how and at current economic conditions.
– Potential assets are those that may be recoverable sooner or later with superior applied sciences or under completely different economic conditions.
The Oil & Gas Journal (OGJ) estimates that at first of 2009, worldwide reserves had been 1.34 trillion barrels of oil and 6,254 trillion cubic feet (Tcf) of pure gas. The oil estimate is sixteen billion barrels of oil larger than in 2007, reflecting further discoveries, improving know-how and changing economics.

Continental North America and far of continental Europe have already been explored heavily, and any new discoveries are more likely to be small. But many areas of the globe are largely unexplored, and large new deposits are ready to be found. International scorching spots which will home vital new oil and fuel reservoirs embrace:

– Offshore Brazil
– The Gulf of Mexico
– Alaska
– Offshore western Africa
– Russia
– Areas throughout Asia and the Pacific.

These are only a few of the present areas of growth. Most observers agree that vital deposits of oil and fuel stay undiscovered within the Center East.

The biggest reserves of natural gasoline are present in Russia, Iran, Qatar, Saudi Arabia, the United Arab Emirates, the United States, Algeria, Nigeria, Venezuela and Iraq.

At present consumption levels, the remaining reserves characterize forty four.6 years of oil and 66.2 years of pure fuel. Does this imply that the world shall be out of fossil fuels in 50 years or so? That theory has been round because the 1970s. In actual fact, the figures for years of remaining reserves have remained relatively constant in the course of the previous few many years because the industry has balanced consumption with newly discovered oil and gasoline deposits.

Historical past of Petroleum

280 to 345 million years in the past – Carboniferous interval; fossil gas formation begins.

Round 3 million years in the past – Stone Age; Huge underground oil reserves seep to the surface in sticky black pools and lumps, known as bitumen. Hunters use bitumen (also called pitch or tar) to attach flint arrowheads to their arrows.

70,000 years in the past – Prehistoric individuals uncover that oil burns with a brilliant, steady flame. The primary oil lamps are made by hollowing out a stone, filling it with moss or plant fibers and setting the moss on fire. Oil lamps remained the main source of lighting till the gasoline lamp invention in Victorian instances. The Greeks improved lamps by placing a lid on the bowl.

6,500 years in the past – People residing in marshes added bitumen to bricks and cement to waterproof their houses from floods. They quickly discovered that it might be used to seal water tanks, waterproof boats (now generally known as caulking) and glue broken pots.

Seventh century BCE – A magnifying glass is used to concentrate the sun’s rays on a fuel and light a fireplace for gentle, warmth and cooking.

Sixth century BCE – Persians uncover that a thinner form of bitumen, known as naft, could be lethal in battle. Persian archers put it on their arrows to fire flaming missiles at their enemies.

2,000 years ago – The Chinese language begin to drill wells in Sichuan. They used bamboo tipped by iron to get brine (salty water) for drugs and preserving food. They found oil and natural gas as they drilled deeper. The natural gas was burned underneath massive pans to boil off the water and acquire the salt. The Chinese refined crude oil for use in lamps and in heating houses.

323-30 BCE – Ptolemaic period; Historic Egyptians preserve their useless as mummies by soaking them in a brew of chemicals such as salt, beeswax, cedar tree resin, and bitumen.

146 BCE – When the Romans set the historic city of Carthage on fire, the bitumen on the roofs ensures the flames spread rapidly and completely destroy town.

67 CE – Middle Ages; When enemies attempt to scale the walls of a castle of fortified town, defenders pour boiling oil down on them. The first use of boiling oil was by Jews defending the city of Jotapata against the Romans in 67 CE. The thought was later adopted to defend castles through the Middle Ages. Oil was extremely expensive, so the method was most likely not used typically.

1750 – A French navy officer notes that Indians dwelling close to Fort Duquesne (now the positioning of Pittsburgh) set fireplace to an oil-slicked creek as a part of a religious ceremony. As settlement by Europeans proceeded, oil was discovered in lots of locations in northwestern Pennsylvania and western New York—to the frequent dismay of the well homeowners, who had been drilling for salt brine.

1780s – Swiss physicist Aime Argand (1750-1803) realizes that by inserting a circular wick in the course of an oil lamp and masking it with a chimney to improve airflow, the lamp would burn 10 instances brighter than a candle, and in addition cleanly. This was the greatest breakthrough in lighting since the time of the Greeks. It revolutionized house life, making rooms vivid at night for the first time in history.

1847 – The world’s first oil nicely is drilled in Baku on the Caspian Sea, what is now Azerbaijan. Identified as the Black City, Baku produced 90 p.c of the world’s oil by the 1860s.

1853 – Polish chemist Ignancy Lukasiewicz discovers the best way to distil oil on an industrial scale. He set up the world’s first crude oil refinery in Poland.

1858 – James Williams (1818-ninety) digs a gap in Lambton County, Ontario, Canada, and located oil bubbled so quickly he might fill bucket after bucket. This was the primary oil well within the Americas. Within a number of years, simple “derricks”—frames for supporting the drilling equipment—dotted the landscape.

1859 – Edwin L. Drake drills down 70 ft (21meters) in Titus, Pennsylvania, and struck oil to create the US first oil effectively. Oil was first discovered when a homemade rig drilled down 70 ft and got here up coated with oil. This rig was near Titusville (in northwestern Pennsylvania) and was owned by “Colonel Edwin L. Drake.

1896 – Henry Ford constructed his first automobile, the quadricycle, to run on pure ethanol.

Thirties – By the nineteen thirties, petroleum is the primary source for fuel because of more supply, better price and efficiency.

1950-current – Oil becomes our most used vitality source due to cars.

1970 – Manufacturing of petroleum (crude oil and natural gas plant liquids) in the US lower 48 states reaches its highest stage at 9.4 million barrels per day. Manufacturing in the decrease forty eight states has been declining ever since.

1972 – Deep-effectively drilling technology enhancements result in deeper reservoir drilling and to access to more assets.

1973 – A number of Arab OPEC nations embargo, or cease selling, oil to the United States and Holland to protest their assist of Israel within the Arab-Israeli “Yom Kippur Struggle. Later, the Arab OPEC nations added South Africa, Rhodesia and Portugal to the record of countries that were embargoed.

Arab OPEC production was cut by 25 %, which brought about some non permanent shortages and helped oil prices to triple. Some filling stations ran out of gasoline and cars had to wait in long traces for gasoline.

Nations reminiscent of France and Japan, which had relied closely on oil for electric technology (39% and 73%, respectively) invested in nuclear energy as a result of oil crisis. As we speak, nuclear energy supplies about 80% and 30% of the electricity in these countries, respectively.

The OPEC oil embargo and the resulting provide shock prompt that the period of low cost petroleum had ended and that the world wanted various fuels. The event of hydrogen gasoline cells for standard commercial applications started.

1988 – Ethanol begins to be added to gasoline for the aim of decreasing carbon monoxide emissions.

2003 – Ethanol begins to grow quickly as the oxygenating factor for gasoline in the US.

Flex-gas vehicles are launched. These vehicles can run on straight ethanol, straight gasoline or a mix of the 2. At present, the majority of recent automobiles sold in Brazil are flex-gasoline.

Right this moment – Sooner or later, water will change fossil fuels as the first resource for hydrogen. Hydrogen will probably be distributed via nationwide networks of hydrogen transport pipelines and fueling stations. Hydrogen energy and gas cell energy shall be clean, ample, reliable, inexpensive and an integral a part of all sectors of the financial system in all areas of the US.

Makes use of for Petroleum

The place would we be with out petroleum? You can kiss lipstick goodbye!

Not solely does petroleum offers gas to run our automobiles, cook our food, heat our properties and generate electricity, it’s also used in plastics, medicines, food objects, and numerous different merchandise, from aspirin to umbrellas, and yes—lipstick! Transportation needs use 66% of all obtainable petroleum to gasoline vehicles, buses, trucks and jets. Meaning 34% of oil is used for all the opposite objects that make our day by day lives simpler. Most individuals do not know how typically they arrive in contact with issues made from oil or natural gas.

Here are a few of the many objects made from petroleum

Synthetic Hearts
CD Players
Compact Discs/DVDs
Computer systems
Credit score Cards
Digital Clocks

Food Preservatives
Rubbish Bags
Golf Balls
Hair Dryers
Dangle Gliders
House Paint
Life Jackets
Medical Gear

MP3 Gamers
Patio Screens
Photographic Film
Piano Keys
Roller Blades
Shaving Cream
Tender Contact Lenses

Assembly Greater Calls for for Petroleum

In areas of the world which can be nonetheless developing, companies and people are demanding greater mobility for themselves and their products. World car possession is projected to extend from 122 automobiles per thousand folks in 1999 to 144 autos per thousand in 2020, with the biggest development occurring in developing nations. The overall consumption of liquid fuels worldwide is expected to extend by 25% from 2006 to 2030.

World population is currently around 6 billion folks but is expected to develop to roughly 7.6 billion by 2020. That will mean a huge enhance in the demand for transportation fuels, electricity and plenty of different shopper merchandise made from oil and natural gasoline.

Superior technology helps the oil and fuel trade discover the power sources the world needs. Expertise advances allow extra correct drilling and extraction of a higher proportion of oil and gasoline from each area, extending the life of each properly. Advanced technology additionally permits engineers to tap sources that have been as soon as impossible, corresponding to deep-sea fields and oil and gas in very deep reservoirs. Together, these new sources of oil and gasoline will change manufacturing from current wells as they decline and help to assure enough oil and gas supplies to meet world power needs for the foreseeable future.

Lowering the Environmental Impact of Fossil Gasoline Consumption

Substantial work will probably be required to deal with the impact of oil and gasoline consumption, notably the emission of carbon dioxide as a significant byproduct. Among the many proposed solutions to this problem is the sequestration, or storage, of carbon dioxide in old oil and fuel fields. Storage of carbon dioxide from power plants and different industrial amenities would require gathering and processing the gasoline, compressing it to excessive pressures, and then injecting it into the small spaces between