Showing posts with label directional drilling. Show all posts
Showing posts with label directional drilling. Show all posts

Saturday, February 6, 2010

Horizontal Drilling And Geosteering Enable Shale Gas Production

In all the excitement (in some circles) about the production of gas utilizing the combination of "horizontal" or directional drilling and hydraulic fracturing of these wells, it is rarely, almost never, (outside of technical journals) described or discussed HOW these wells are drilled. How are they guided, how are they "steered" into and through the desired layers of rock, in this case shale? Many technologies are brought to bear in finding and producing this gas. Much of that work is held tight by energy companies and much of it goes unheralded. But that will change.
Peter

The Quiet Energy Revolution



FROM-American

By Max Schulz

How ironic that during the ‘drill, baby, drill’ demonstrations as gasoline prices spiked in 2007 and 2008, a silent revolution with natural gas was already underway that will make those concerns largely irrelevant

The 20th century was the century of oil. Wars were fought over it, and the outcomes of the century’s biggest conflicts hinged on the stuff. In World War I, for instance, Churchill’s conversion of the British Navy to oil gave the crown’s ships supremacy over German vessels. In World War II, when the Nazis and Japanese each failed to secure supplies of oil, they were doomed. Later, President Ronald Reagan, CIA Director William Casey, and America’s Middle Eastern partners manipulated global oil production to bankrupt the Soviet Union and win the Cold War. In the first half of the century, oil policy served as the catalyst for military victory. In the second half, oil helped propel the greatest economic expansion in the history of the world, and liberated mankind from the tyranny of immobility.

All hail oil! But not too much, because the 21st century won’t be defined by oil. It is more likely to be defined by a different fossil fuel: natural gas.

Two monumental shifts in the world of energy are underway right now: one technological, the other financial. They will change the way we power our lives (especially our cars), provide a real measure of energy security, and help curb greenhouse gas emissions. Neither shift has anything to do with the turn to a green renewable energy economy promised by President Obama.
Physics ensures that will never happen, no matter how much wishful thinking (and government subsidy) is applied. Sorry, greens, carbon-based energy will continue to dominate our energy future, not windmills or solar panels.

The first profound shift was made possible by a little-noticed technological breakthrough in the last three years that has changed the way we extract natural gas. Engineers now make use of two important innovations.
One is horizontal, or directional, drilling, which permits wells to move laterally beneath the surface instead of going straight down. This technology minimizes the number of holes that have to be drilled, leaving a smaller surface footprint and accessing a larger area.
The other technology is hydraulic fracturing, used to extract gas trapped in porous shale rock. In this process, also known as fracking, water and chemicals are pumped at tremendous pressure into shale rock formations to push gas into pockets for easier recovery.

By marrying and perfecting the two processes into a technology called horizontal fracking, engineering has virtually created, from nothing, new natural gas resources, previously regarded as inaccessibly locked in useless shale deposits. Suddenly, the mammoth shale formations in Texas, Pennsylvania, Ohio, New York, North Dakota, and elsewhere have the potential to produce abundant amounts of gas for decades to come.

How significant are these developments? Exxon Mobil announced in December that it will pay $41 billion—that’s right, billion—to acquire XTO Energy and its expertise at extracting unconventional natural gas resources. The French energy company Total SA, meanwhile, is paying $2.2 billion to acquire a 25 percent stake in Chesapeake Energy’s Barnett Shale operations in Texas.

Human ingenuity has turned theoretical gas reserves—too costly ever to be exploited—into practical resources. And just in time. Less than a decade ago, experts were noting that conventional natural gas production had begun to plateau, despite annual increases in the number of wells drilled. The National Petroleum Council warned in 2003 that “North America is moving to a period in its history in which it will no longer be self-reliant in meeting its growing natural gas needs.” In the spring of 2004, Federal Reserve Chairman Alan Greenspan warned that, driven by these looming shortages, wellhead natural gas prices might top $6 per thousand cubic feet by summer, roughly double 2002 prices; and indeed, until the recession brought down demand, natural gas did sell in the $5–$9 per thousand cubic feet range.

Horizontal fracking has helped eliminate many of those grave worries. As Pulitzer-prize winning author and energy analyst Daniel Yergin and his colleague Robert Ineson wrote recently in the Wall Street Journal, production in the lower 48 states “surged an astonishing 15 percent from the beginning of 2007 to mid-2008.” And this is just the tip of the iceberg, as production ramps up in the nation’s shale formations, such as in Marcellus, Bakken, and Haynesville. What was once a shortage has given way to a glut, or, as Yergin and Ineson put it, a “shale gale.”

Proven reserves of natural gas in the United States have been revised upward by 50 percent in the last decade, and those numbers are sure to climb higher as more shale gas is discovered. Perhaps not surprisingly, other nations are sending geologists to the United States to study techniques for extracting gas from unconventional sources. China, India, and Australia all have enormous shale fields. In the coming decades, the shale gale won’t be just an American phenomenon; it will blow all over the globe.

A technological advance created the first shift, driven by free markets not by government edict. The second shift complements the first, and has taken place again because of the way free markets work. That is the formation of a global market for natural gas, much the same as the global petroleum market.

We are accustomed to think of crude oil as a global commodity, its price the same roughly all over the world. Partly that is because oil is so easily transported. Turn on the taps, and a tanker ship can be filled with liquid crude before heading for any seaport on the planet. On land, oil can travel by pipeline, by truck, or even by the barrel or the one-gallon container. The portability of oil helped an international market begin to blossom more than a century ago.

Natural gas and natural gas markets, however, are different. Ethereal and highly flammable, natural gas poses significant transportation problems. A tanker ship can’t simply fill up and shove off. For this reason, there has been no single global market for gas, but a number of balkanized, regional markets all over the planet. The price of natural gas in one region has little connection to the price in another, and for many years regions facing shortages could not be relieved by gas from regions with excess capacity.

That is changing, not as rapidly as the shale gale has transformed America’s gas picture, but still rapidly compared with other business transformations. The reason is liquefied natural gas (LNG). Innovations in liquefaction and re-gasification technologies allow gas to be condensed to 1/600th its size, which then can be shipped by sea. Major infrastructure investments by energy companies and governments, along with the development of specially designed double-hulled tankers to transport LNG, are creating a robust, integrated market for natural gas.

The implications are profound and largely positive. The new mobility of LNG will bring a sorely needed measure of market stability after the past five years of unpredictability in price and supply.

On the other hand, some observers fear that creating a global marketplace will spur the establishment of a nefarious natural gas cartel similar to oil’s OPEC. Such worries, however, overstate a potential cartel’s capacity to manipulate a diversified, global market, particularly one in which nations like Australia, Canada, and the United States will be heavyweights. Indeed, one truly positive benefit is that the emergence of a market for LNG will severely limit Russia’s ability to use its significant gas resources as a political and economic weapon, as Moscow has done in recent years with its European neighbors.

LNG, along with the shale gale, should help keep natural gas prices low for a long time. The average wellhead price for natural gas in the United States had crept to $8 per thousand cubic feet in 2008. There is little doubt that high energy prices were among the contributing factors to the economic downturn that began in the latter half of 2008. An ocean of cheap gas augurs well for America’s and the global economy’s future.

Natural gas may also change how we drive, and enable ordinary consumers to break oil’s monopoly on transportation. As my colleague, Peter Huber, notes in a recent Manhattan Institute report, “Gas-handling technologies [have] improved quite enough to make natural gas a practical alternative” to oil. After all, gas is cheaper than gasoline and diesel per unit of energy. That’s why large stationary power plants that used to run on oil switched to natural gas long ago.

The chief obstacle to developing a natural gas infrastructure capable of supplying service stations and highway rest stops is regulatory. If that is removed—and here we do need government action—we could expect to see trucks, buses, and cars running on natural gas in a relatively short period of time. The reduction in greenhouse gas emissions would be considerable.

We may also see continued inroads of gas into the electricity-generating sector (which can also affect transportation as we move to hybrid and electric vehicles). Gas emits about half as much carbon per unit of energy as coal. With worries about long-term gas supplies allayed, expect regulators and utilities to favor construction of new gas-fired power plants over controversial coal plants, which are more expensive to build anyway. This same thing happened during the 1990s, and gas shot to a 20 percent share of America’s electricity economy as a result.

The Energy Information Administration estimates that U.S. demand for electricity will rise 26 percent by 2030. Gas-fired power is slightly more expensive than coal-fired electricity today and much more expensive when the wellhead price of gas soars. But stable, lower long-term gas prices brought on by the shale gale and the emerging LNG market will ensure that coal’s pricing advantage is not so pronounced. Gas is well positioned to help meet that increase.

The age of oil took off with a boom when the Spindletop gusher blew in 1901. A century later, as the price of oil hit new records, our politics were inflamed by an acrimonious debate over offshore oil drilling and breaching the Arctic National Wildlife Reserve. How ironic that during the “drill, baby, drill” demonstrations as gasoline prices spiked in 2007 and 2008, a silent revolution with natural gas was already underway that could make those concerns largely irrelevant.

Max Schulz is a senior fellow at the Manhattan Institute

More...


Wednesday, October 7, 2009

Boomtown Shreveport, LA Concerned About Drilling

September 02, 2009

Thursday, August 27, 2009

Careful Drilling Needed To Produce Shale Gas

It is possible to "steer" a well while it is being drilled, "land" it exactly where desired, and keep the well drilling for thousands of feet within a thin target zone, or "sweet spot"........ and for a lot less than $100,000. I speak from experience.
Peter


NAPE: Drastic improvements needed in shale gas


By OGJ editors
HOUSTON, Aug. 26
-- Efficiency improvements of at least an order of magnitude are needed in US shale gas plays because field costs will not stay at the levels to which they have dropped since late 2008, said a speaker Aug. 26 at the Summer NAPE E&P Forum in Houston.

Now that the industry has mastered combination of horizontal drilling and multiple frac stages, the rate of technology growth seems to be slowing, said William Coates, president, Schlumberger Oilfield Services, North America. Taking more measurements in each well may be the key.

Drilling and completion capital costs are not going to stay low, and field service costs may begin to increase within a few months, said Coates.

The proliferation of frac jobs to as many as several dozen per well is inefficient, and most operators don’t take enough measurements in the vertical or horizontal portions of shale gas wells once they have completed their initial reservoir characterization drilling, he said. The move from science mode to gas manufacturing is too abrupt.

Companies should set a goal of obtaining the same ultimate recovery by “doing less,” Coates urged. They must find ways to cut the drilling time of a typical shale well to 7 days from 28, for example, by attaining the capability for a single bit run for the vertical part of the hole and one bit run for the curve and lateral.

Landing the lateral at the depth of the sweet spot at any given well location could result in twice to three times the ultimate recovery if an operator spent an extra $100,000 on measurements, Coates estimated.

Other steps toward efficiency could come in the use of friction reducers and biocides to halve the amount of water required for fracs, laying fiber optic cable outside casing to measure vibration to learn which frac stages are producing, and learning how to conduct fewer inefficient fracs by using log-while-drilling measurements to select perforated intervals.

Friday, April 3, 2009

The Marcellus Shale Gas Play: Part 2

The following is continued from the article prepared by Penn State University and explains the Marcellus Shale Gas Play.
Peter


The Marcellus Shale
The Marcellus shale is a deep layer of rock that
lies 5,000 to 9,000 feet underground and runs from
the southern tier of New York through the western
portion of Pennsylvania, into the eastern half of
Ohio, and through West Virginia.
In Pennsylvania,
the formation extends from the Appalachian plateau
into the western valley and ridge. While this area has
produced natural gas for years, many gas production
companies are now interested in the Marcellus shale
because of higher energy prices and new drilling
technologies that could recover an estimated 50
trillion cubic feet of natural gas.
Conservative
estimates state that the Marcellus shale contains 168
trillion cubic feet of natural gas; in reality, it could

contain as much as 516 trillion cubic
feet.
The United States currently
produces roughly 30 trillion cubic feet
of gas a year and demand for this gas
is increasing steadily.

Typical drilling rig and pipe used to drill a deep and long horizontal well.

Where and How Does Drilling
Take Place?
Natural fractures in the Marcellus
shale are important to recovering large
amounts of gas. As heavily organic
sediments were deposited 380 million
years ago, the black shale that makes
up the Marcellus was formed. As the
organic material decayed, methane
and other components of natural gas
formed and are now trapped tightly
in the dense shale.


About 300 million
years ago the pressure of the gas
caused fractures in the formation.
These fractures run as slices from the
northeast to the southwest and are
fairly close together.
While a vertical
well may cross one of these fractures and other
possibly less productive fractures, new technology
allows for horizontal drilling, which crosses a series of
fractures and may be more productive.


Gas wells are drilled in locations where a gas
company has obtained the right to explore for and
develop natural gas. Wells are spaced according
to mineral laws and regulations, with the goal of
extracting gas efficiently using as few wells as
possible.


Geologists and geophysicists working
for gas companies use seismic data to interpret the
formations of rock layers underground. If seismic data
suggest a reasonable possibility of efficient gas access,
a well will be drilled in a specific location using long
sections of drill pipe. Depending on the geology, the
drillers may drill vertically for several thousand feet
and then use special joints to turn the shaft 90 degrees
over the course of several hundred feet and continue
drilling horizontally for an additional distance of
up to 5,000 feet.


A steel casing is cemented in place
to stabilize the surface of the well bore and protect
groundwater resources. Horizontal drilling enables
companies to extract more gas in a cost-effective
manner. In many cases, multiple wells may be drilled
side by side on the same well pad, radiating out in
different directions.



Natural Gas Well Development
Development of an individual natural gas well site
typically follows this basic timeline, though it may
vary somewhat at any one site. The stages include:


1. Leasing activity, during which land is put under
contract and secured for natural gas exploration
and development. This stage normally lasts four
to six months.


2. Exploration and seismic testing, which is done to
find the areas that will offer the highest potential
natural gas yields. Exploration and seismic testing
typically last about four months.


3. Site preparation and drilling stage, including earth
moving, road grading, and well pad construction
as well as drilling and fracing. This stage lasts
from four to eight weeks. Pipeline is laid to
connect the well to feeder pipelines, allowing the
gas to reach market.


4. Site reclamation activities, during which stage
the active well site is stabilized and vegetation
is established. Site reclamation lasts about two
weeks.


5. Extraction and transport of natural gas from the
well, which can potentially last from five to thirty
years (depending on the productivity of that individual
well). Wells receive active maintenance
throughout their lifespan, which means ongoing
access is required. In addition, it is possible
that the well may be refraced at some later date,
temporarily bringing back much of the equipment.


6. Closure plan, a procedure that is influenced by
the landowner’s leasing terms, during which the
inactive well is closed and the site restored.
When their role on an individual site is completed,
the different crews typically move to a new well site
nearby to do site prep and drilling. Thus, within any
one community at any one time, there will be well
sites in different stages of development.


Why Marcellus Is Different from Shallow Wells
The gas produced from deep well drilling is under a
higher pressure than in shallow or traditional wells
,
which necessitates different handling techniques and
equipment. Unlike shallow wells with natural gas
reserves, gas derived from the Marcellus shale is held
tightly within the shale so the method of extraction
is quite different.


Current technology uses significant
quantities of water under very high pressure to
fracture (frac) the shale.
Due to the fact that wells are

horizontally drilled to access more shale, the amount
of water required for fracing these wells is significant,
between one and five million gallons or more per
well. This quantity of water required for fracing may
contribute to a significant number of issues in affected
communities.

Tuesday, February 10, 2009

Solving The Financial Crisis AND The Energy Crisis

Here is some positive news about the economy and America's need for abundant, inexpensive, clean energy. Somehow the credit markets must be re-established so these independent producers can do what they do best: find, produce, and deliver the abundant natural gas resources known to exist.

This will not be the only way to work out of this economic recession, but it will be a giant step in the right direction. See the following article and consider the added graphs and charts.
Peter


Financial Crisis = Energy Crisis? (source) posted Sept. 30, 2008

Up until a few weeks ago, energy was a front-page topic. Now its place has been taken by our financial crisis. But while all the mainstream media attention regarding the present financial crisis has focused on its threat to America’s financial sector, the fact is that threat very much includes our present and future ability to meet our energy needs.

Most of our domestic natural gas production is not the work of so-called “big oil,” but rather by independent producers who are entrepreneurial businesses that make their revenues only by producing natural gas. They utilize the futures market to reduce risk and to ensure a certain return on what they produce but have no retail or other operations that can offset big swings in price. Current domestic production is threatened because of the massive amounts of capital it requires to drill and produce that natural gas here in the U.S. Producers must have access to that capital.

At the same time, the financial crisis has increased the volatility of the energy markets. Bear Stearns, Lehman Brothers, Goldman Sachs and others all played a major role in the commodities markets, including energy. The buying and selling that has occurred, as the major players have had to liquidate some positions and cover others have roiled the markets, making it extremely difficult for independent producers to do any long-range planning. It also has left some holding the bag.

Tulsa, Oklahoma-based Semgroup LP’s bankruptcy, caused by the firms’ huge exposure to energy options trading, has left thousands of small producers who sold oil to the firm owed millions, and the producers unable to pay royalty owners. We don’t have to go far back in time to see what happens if the independent producers are harmed.

In the late 1990’s, Venezuela flooded the U.S. market with below-cost Venezuelan oil. Oil fell to $8 a barrel, if you can imagine that now—less than 10 years ago. This was done with the goal of driving America’s independent oil producers out of business, about a million barrels of oil a day. Thousands of independent producers who had hung on through the boom and bust 1980’s were put out of business, and our reliance on foreign oil, and the transfer of American wealth overseas, increased accordingly. But it wasn’t only our domestic oil production that was lost.

Many of the independents were also natural gas producers. But we were able to move from a position of natural gas want to natural gas abundance with new, more expensive technology and new ideas that unlocked natural gas from shales and sands. That brings us to a less tangible, but no less real aspect to the present threat, and it is the fact that independents also bring the kind of “outside the box” thinking needed to solve our energy and environmental problems.

In the 1970’s, while the best and brightest of the biggest oil companies were busy telling Congress we were running out of natural gas, such small independents as GHK’s Bob Hefner had the gall to challenge them both in words and deeds, in the end proving that natural gas could be found even where no oil existed, and at depths never before thought possible. Independents were way ahead of the curve in jumping in with both feet when it came to natural gas, to the point where today in America, more than 90 percent of the working rigs are exploring for the natural gas that is so critical to our present and future energy needs.

The shale production techniques that have played such a key role in just the past four years in providing abundant supplies of clean-burning natural gas were developed by an independent producer and it is the American independent producers that are leading the way in developing these clean energy sources for the future right now. This kind of entrepreneurial thinking is also driving the current development of wind, solar, and biomass, which, in conjunction with natural gas, can form an energy portfolio that will secure a green energy future for us. But these sectors are also facing the same threats. Access to capital is essential for these “plays” to develop to their full potential. The need for wise, forward-thinking policy decisions has never been greater. You cannot have a sound economy without American energy to fuel that economy. A strong capital market is essential to any energy policy. And an energy policy that ignores the environment is self-defeating. It’s not just financial institutions that are at stake in this debate, but our energy and environmental future as well.

Friday, February 6, 2009

Why Horizontal Drilling?

There are many reasons why horizontal, or directional wells are valuable and almost indispensable to modern oil and gas production. The following simplified article explains just a few. The BIG question, from a geologist's point of view is "HOW does a person at the surface know where the drill bit is and where it is going?" Remember, the drill bit and hole can be up to tens of thousands of feet below the surface of the Earth and thousands of feet away from the surface location. In order to "steer" the well you must know where it is. In order to know what layers of rock the well has drilled through a geologist must be able to recognize them.

This is where the art and science of interpretation comes to play and I'll attempt to answer these questions in future posts.
Peter


Horizontal drilling (source)
We talk about "pools" of oil, but in fact the stuff exists between the grains of porous rock like sandstone. Oil can travel through rock, but so slowly that it would probably lose a race with a whip-tailed paramecium.
So if you're interested in oil, you gotta make house calls. Translated: You gotta drill right into the reservoir. Not only can it be a tiny target, but even if you hit a bulls-eye, the well may be unproductive. Say a vertical drill pierces 5,000 feet of rock into an oil reservoir that's 20 feet thick. Because oil moves slowly, the 20-foot exposure would not tap much oil.
Over time, of course, more oil would seep toward the well, Bergt says. "If you could wait one million years for nature to refill it, that would be great." But drillers can't wait that long, and "In the old days, you'd move 200 feet and drill another well."

Once upon a time, drillers extracted oil with this Swiss cheese routine; new techniques reduce the need for wells. (Image courtesy of the United States Department of Energy.)

Do the math.
In a big field, thatsa lotta holes. Expensive holes.
With horizontal drilling, the entire picture changes, Bergt says. "Instead of drilling 20 wells, you'd drill two or three for the same recovery." On land, the technique also reduces the "footprint," the area damaged by drilling operations. At sea, it allows drilling many wells from a single platform.
Bent pipe solution? Because the pipe that drives oil drills is surprisingly flexible, a horizontal well can snake around to reach isolated pockets or follow a reservoir that meanders across the terrain.
Horizontal drilling has evolved over the past 25 years, and even though it remains more expensive than vertical drilling, greater productivity led to rapid acceptance. Between 3,000 and 4,000 wells are drilled annually with the technology. The record hole is a long-haul monster that wanders almost 7 miles, on the coast of southern England in the Wytch Farm oil field.

This roller cone drill bit was adapted from one used by 19th -century dentist (NOT). Use it to cut hard and/or abrasive rock.
Courtesy University of California-Berkeley petroleum engineering program.

Coil tubing
Traditionally, oil bits were driven by 30-foot sections of steel pipe. Pulling a bit up for sharpening involved hours or days of yanking pipe out of the ground and unscrewing it. In the past five years, drillers have come up with an alternative -- coil tubing.
Packed in giant reels holding 4,000 feet of tubing, the stuff is simply unreeled and lowered into the hole. Instead of rotating the tubing to spin the bit, high pressure drilling mud is sent, as usual, through the tubing. At the other end, however, is a hydraulic motor that rotates in response to mud pressure.

Peter Meenan says coil tubing also lends itself to scavenger operations -- tapping pockets of petroleum that seismic techniques show are near to existing wells. Meenan, who directs the Oil and Gas Institute at the University of Aberdeen, Scotland, says coil-tubing drilling, combined with steerable drill bits, may be used when a new pocket of hydrocarbons is discovered, say, 1,000 feet from a deep well. Rather than drill from the surface, it's possible to start drilling part-way down and veer off to reach the new deposit.

Welcome To GeoPete's View

Dedicated to the prospector and explorer in all of us. Never say die. Never give up.
Welcome to my blog about the topic of horizontal drilling as it relates to oil and gas exploration. Actually, the term "horizontal drilling" is a bit of a misnomer. In reality, what we are dealing with is controlled directional drilling. The object is to create a well bore in a productive oil or gas pay zone for as long a distance as is possible. This requires navigating or steering the well as it is being drilled. Increased production rates, volumes, and profitability are the ultimate goals.

Since oil and gas is almost always found in sedimentary rocks deposited in layers, the trick is to keep the well in one or more of these preferred layers. These layers of rock can vary considerably in thickness, structure, and many other properties. This is why geological knowledge and experience is so important. However, the geologist can not work alone. Engineers and others are a vital part of the process and we must all work together.

I am an independent, consulting geologist, trained and experienced in exploration and interpretation, so my input here will be from that perspective. However, I will be posting what I consider relevant articles from geologists, engineers, geophysicists and others. I hope to generate input and discussion from those interested in this relatively new technology. Drilling, interpreting and completing these horizontal wells is expensive and challenging. It requires the coordinated effort of a team of experts.

Please add your comments, experience, and questions. If I don't have the answers, I'm sure I can find someone who does. Sharing our knowledge is the name of the game.