Archive for the ‘Pennsylvania Natural Gas Drilling’ Category

Horizontal Drilling to Penetrate More Fractures

The fractures (also known as “joints”) in the Marcellus Shale are vertical. So, a vertical borehole would be expected to intersect very few of them. However, a horizontal well, drilled perpendicular to the most common fracture orientation should intersect a maximum number of fractures.

High yield wells in the Marcellus Shale have been built using the horizontal drilling technique. Some horizontal wells in the Marcellus Shale have initial flows that suggest that they are capable of yielding millions of cubic feet of gas per day, making them some of the most productive gas wells in the eastern United States. Although some experts are very optimistic on the long-term production rates of these wells, it is too early to determine their productive life or long-term yield.

A second method is used to increase the productivity of a well. That is to increase the number of fractures in a well using a technique known as “hydraulic fracturing” or “hydrofracing”. This method uses high-pressure water or a gel to induce fractures in the rock surrounding the well bore.

Hydrofracing is done by sealing off a portion of the well and injecting water or gel under very high pressure into the isolated portion of the hole. The high pressure fractures the rock and pushes the fractures open.

To prevent the fractures from closing when the pressure is reduced several tons of sand or other “propant” is pumped down the well and into the pressurized portion of the hole. When the fracturing occurs millions of sand grains are forced into the fractures. If enough sand grains are trapped in the fracture it will be propped partially open when the pressure is reduced. This provides an improved permeability for the flow of gas to the well.

Copyright: Geology.com

Both vertical and horizontal wells are used in shale gas drilling and completion; however, horizontal wells are the increasing trend due to both environmental concerns and economic efficiency (DOE, 2009). Horizontal drilling allows more exposure within the formation to optimize capture of natural gas as well as reducing the environmental footprint of drilling activity (DOE, 2009). The United States Department of Energy’s recently released document on shale gas development in the United States explains that “a vertical well may be exposed to as little as 50 ft of formation while a horizontal well may have a lateral wellbore extending in length from 2,000 to 6,000 ft within the 50-300 ft thick formation” (DOE, 2009, p.47). As such, surface disturbance and impacts to wildlife and communities are reduced while providing optimal gas recovery; considering 16 vertical wells per 640-acre section of land would disturb 77 acres, the equivalent in horizontal wells (4- horizontal wells) would disturb approximately 7.4 acres (DOE, 2009). In addition to reductions in surface disturbance, horizontal wells allow for development in areas previously considered unavailable, primarily urban and environmentally sensitive or protected areas. Well pads can be located away, or ‘setback’, from residences, roadways, wildlife habitats and other protected areas without hampering access to available gas reserves.

In order to recover the shale gas after drilling a well, current industry practice is to hydraulic fracture the formation to stimulate the near wellbore area and facilitate the release of natural gas trapped within the shale. Hydraulic fracturing is a process whereby a fracturing fluid, primarily water, is pumped into the formation under pressure at a calculated rate to form fractures and cracks within the formation, providing a pathway for the gas to migrate to the wellhead for recovery. Sand or other granular materials are added to the fracturing fluid to help ‘prop’ open the newly created fractures after the fluid has been removed from the formation (ALL, 2008a). Additional chemicals may be added to the fracturing fluid for specific engineering purposes; these additions may include friction-reducing agents, biocides and various stabilizers to prevent corrosion of metal piping in the well (DOE, 2009; ALL, 2008a). Depending on the formation and well characteristics, multiple fracturing procedures may be performed in order to fully develop the well for gas recovery (DOE, 2009). While each well and geologic formation is unique, continuing advances in horizontal drilling and well completion practices provide additional reductions in environmental impacts from oil and gas activities while providing the nation’s critical energy supply.
Copyright: GoMarcellusshale.com

April 5, 2010

EILEEN GODIN Times Leader Correspondent

Well-water testing in advance of natural gas drilling operations in parts of Luzerne County could give homeowners with wells knowledge, a baseline for future testing and a legal leg to stand on if their water becomes tainted, some experts say.

Marcellus Shale gas drilling is coming into Luzerne County this summer. EnCana Oil and Gas USA Inc., based in Denver, Colo., will be starting a site in Lake Township off Zosh Road in June or July.

Drilling could also be coming to other mostly Back Mountain area communities. Some area groups have voiced strong opposition to the drilling, and some landowners in counties where drilling is already taking place have said their water wells have been inversely affected by gas drilling activities.

EnCana Community Relations Adviser Wendy Wiedenbeck said her company has drilled 8,700 gas wells and has not had “any instance of well water becoming contaminated.” She said EnCana takes great pains not to damage water wells.

“It is in our best interests not to impact water supplies,” she said. Wiedenbeck said that besides using the standard cement casing at the gas-drilling site to protect underground water sources, a second cement casing will be used for added protection.

She said the casings are inspected regularly throughout the life of the well.

Encana’s zero tolerance of spills means its employees are specially trained for operating valves at drilling operations or transporting liquids, she said.

All spills are reportable, and the federal Environmental Protection Agency has a toll-free line to report them at (877) 919-4372.

“We are very proud of our environmental record,” she said.

To be prepared, residents within a mile radius of the drilling sites are advised to have their well water tested, Wiedenbeck said.

The trick is knowing what kind of testing is needed and the proper way to take a sample.

Aqua-Tech Laboratory Director Joseph F. Calabro, Mountain Top, said well water owners should have a state Department of Environmental Protection-certified lab do the testing. Someone who is certified with the lab should draw the water and a chain of custody for the water sample should be followed, he said.

A chain of custody for the sample is a log that is signed and dated by the person taking the water sample and given to the lab, where it is signed and dated upon receipt. Calabro said this log will stand up in court.

A listing of state-certified labs, by county, can be found at http://water.cas.psu.edu. Click on “information” on water issues related to Marcellus drilling. Then, on the right side of the screen, click on “find a lab.”

Calabro said homeowners should know what is normally in their well water. He said small amounts of minerals such as barium, sodium, manganese and iron, are already in well water, along with many other minerals.

He said that once this baseline for what’s in the water is established, then testing for industry-specific indicators can be performed.

He advised that if homeowners notice a change in taste, clarity or smell of their water, they should have it tested right away.

Concerned that nervous residents could be charged for more testing that what is really needed, he said he is willing to attend municipal meetings to discuss minerals and industry-specific indicators to watch for.

Wilkes University geologist Brain Ora said he is hoping homeowners will be willing to share their testing results to compile a database, by zip code, to show water quality history. He said that over time the database will track changes of water quality.

Copyright: The Times Leader

Environmental Resources and Energy hearing Wednesday at Kingston Township building.

By Steve Mocarskysmocarsky@timesleader.com
Staff Writer

KINGSTON TWP. – Several people with concerns about natural gas drilling in Pennsylvania – and especially in the Back Mountain – are scheduled to testify Wednesday at a public hearing before a state House of Representatives committee.

State Rep. Phyllis Mundy requested and is hosting a hearing of the House Environmental Resources and Energy Committee at the Kingston Township Municipal Building from 1 to 3 p.m.

Mundy, D-Kingston, said she has “grave concerns” that there are inadequate protections in place to protect the environment from drilling associated with the Marcellus Shale formation.

“I don’t think we’re going to be able to stop Marcellus Shale drilling, but we need to make sure it doesn’t leave a legacy like that of coal. An ounce of prevention is worth a pound of cure,” Mundy said on Monday.

She said she believes a proposed drilling site in Lehman Township is “much too close” to the Huntsville and Ceasetown reservoirs, which provide drinking water to many of her constituents.

Committee Majority Chairman Camille “Bud” George notes in a press release that the state Department of Environmental Protection issued more than 1,300 drilling permits in 2009 and more are expected in coming years, yet no study exists on the environmental or human health impacts of gas development in Pennsylvania.

Testimony will be presented about mitigating environmental risks and House Bill 2213 – the Land and Water protection Act introduced by George, D-Clearfield County.

The bill would:

• Require state inspections of wells during each drilling phase.

• Extend to 2,500 feet the presumed liability of a well polluting a water supply; the current radius is 1,000 feet.

• Require full disclosure of chemicals used in the hydraulic fracturing of the gas.

• Update bonding requirements to cover the costs of decommissioning a well. Current regulations call for a $2,500 bond, but the cost to cap a well could range from $12,000 to $150,000 for a deep well, according to George.

Scheduled to testify are Dr. Thomas Jiunta, a local podiatric physician active in environmental causes; Dr. Gere Reisinger, a physician whose 200-acre farm in Wyoming County has been affected by drilling; Victoria Switzer, whose water at her home in Dimock, Susquehanna County, was contaminated after nearby drilling; Brady Russell, eastern Pennsylvania director, Clean Water Action; and Jeff Schmidt, senior director, Sierra Club, Pennsylvania Chapter.

Copyright: Times Leader

Throughout most of its extent, the Marcellus is nearly a mile or more below the surface. These great depths make the Marcellus Formation a very expensive target. Successful wells must yield large volumes of gas to pay for the drilling costs that can easily exceed a million dollars for a traditional vertical well and much more for a horizontal well with hydraulic fracturing.

And rock units are not homogeneous. The gas in the Marcellus Shale is a result of its contained organic content. Logic therefore suggests that the more organic material there is contained in the rock the greater its ability to yield gas. John Harper of the Pennsylvania Geological Survey suggests that the areas with the greatest production potential might be where the net thickness of organic-rich shale within the Marcellus Formation is greatest.

Copyright: Geology.com

EILEEN GODIN Times Leader Correspondent

Well-water testing in advance of natural gas drilling operations in parts of Luzerne County could give homeowners with wells knowledge, a baseline for future testing and a legal leg to stand on if their water becomes tainted, some experts say.

Marcellus Shale gas drilling is coming into Luzerne County this summer. EnCana Oil and Gas USA Inc., based in Denver, Colo., will be starting a site in Lake Township off Zosh Road in June or July.

Drilling could also be coming to other mostly Back Mountain area communities. Some area groups have voiced strong opposition to the drilling, and some landowners in counties where drilling is already taking place have said their water wells have been inversely affected by gas drilling activities.

EnCana Community Relations Adviser Wendy Wiedenbeck said her company has drilled 8,700 gas wells and has not had “any instance of well water becoming contaminated.” She said EnCana takes great pains not to damage water wells.

“It is in our best interests not to impact water supplies,” she said. Wiedenbeck said that besides using the standard cement casing at the gas-drilling site to protect underground water sources, a second cement casing will be used for added protection.

She said the casings are inspected regularly throughout the life of the well.

Encana’s zero tolerance of spills means its employees are specially trained for operating valves at drilling operations or transporting liquids, she said.

All spills are reportable, and the federal Environmental Protection Agency has a toll-free line to report them at (877) 919-4372.

“We are very proud of our environmental record,” she said.

To be prepared, residents within a mile radius of the drilling sites are advised to have their well water tested, Wiedenbeck said.

The trick is knowing what kind of testing is needed and the proper way to take a sample.

Aqua-Tech Laboratory Director Joseph F. Calabro, Mountain Top, said well water owners should have a state Department of Environmental Protection-certified lab do the testing. Someone who is certified with the lab should draw the water and a chain of custody for the water sample should be followed, he said.

A chain of custody for the sample is a log that is signed and dated by the person taking the water sample and given to the lab, where it is signed and dated upon receipt. Calabro said this log will stand up in court.

A listing of state-certified labs, by county, can be found at http://water.cas.psu.edu. Click on “information” on water issues related to Marcellus drilling. Then, on the right side of the screen, click on “find a lab.”

Calabro said homeowners should know what is normally in their well water. He said small amounts of minerals such as barium, sodium, manganese and iron, are already in well water, along with many other minerals.

He said that once this baseline for what’s in the water is established, then testing for industry-specific indicators can be performed.

He advised that if homeowners notice a change in taste, clarity or smell of their water, they should have it tested right away.

Concerned that nervous residents could be charged for more testing that what is really needed, he said he is willing to attend municipal meetings to discuss minerals and industry-specific indicators to watch for.

Wilkes University geologist Brain Ora said he is hoping homeowners will be willing to share their testing results to compile a database, by zip code, to show water quality history. He said that over time the database will track changes of water quality.

Copyright: Times Leader

As recently as 2002 the United States Geological Survey in its Assessment of Undiscovered Oil and Gas Resources of the Appalachian Basin Province, calculated that the Marcellus Shale contained an estimated undiscovered resource of about 1.9 trillion cubic feet of gas.  That’s a lot of gas but spread over the enormous geographic extent of the Marcellus it was not that much per acre.

In early 2008, Terry Englander, a geoscience professor at Pennsylvania State University, and Gary Lash, a geology professor at the State University of New York at Fredonia, surprised everyone with estimates that the Marcellus might contain more than 500 trillion cubic feet of natural gas. Using some of the same horizontal drilling and hydraulic fracturing methods that had previously been applied in the Barnett Shale of Texas, perhaps 10% of that gas (50 trillion cubic feet) might be recoverable. That volume of natural gas would be enough to supply the entire United States for about two years and have a wellhead value of about one trillion dollars!
Copyright: Geology.com


A few years ago every geologist involved in Appalachian Basin oil and gas knew about the Devonian black shale called the Marcellus. Its black color made it easy to spot in the field and its slightly radioactive signature made it a very easy pick on a geophysical well log.

However, very few of these geologists were excited about the Marcellus Shale as a major source of natural gas. Wells drilled through it produced some gas but rarely in enormous quantity. Few if any in the natural gas industry suspected that the Marcellus might soon be a major contributor to the natural gas supply of the United States – large enough to be spoken of as a “super giant” gas field.

Copyright: Geology.com

Coalition explores possible downside of gas exploration.

By Steve Mocarskysmocarsky@timesleader.com
Staff Writer

DALLAS – A Back Mountain-dominated crowd that packed Dallas United Methodist Church on Wednesday night learned about the down side of natural gas drilling.

In a presentation titled, “A Look into the Future – the Landscape of Northeastern Luzerne County After Drilling Starts,” the Luzerne County-based Gas Drilling Awareness Coalition presented a documentary film with commentary from people living in gas-drilling areas of Colorado and local speakers who have familiarized themselves with health and environmental aspects associated with drilling.

The presentation is relevant locally because EnCana Gas & Oil has leased tens of thousands of acres of land in the northern part of the county and exploratory drilling is expected on one to three sites by June.

Coalition member Leanne Mazurick, of Dallas Township, introduced the film, in which Colorado residents shared experiences with drilling.

“They are just having no consideration for the people who live here. We are expendable,” one woman in the film said.

A man noted that every well drilled means 200 to 300 trucks traveling in and out of a community during the drilling process. “Air pollution, water pollution or the chance of water pollution, social issues, economic issues, the infrastructure is not keeping up.”

Another said the gas business “sucked up our labor pool,” and led to increased violence and drug problems.

One Colorado resident encouraged citizens to educate themselves and to attend meetings such as Wednesday night’s. “The gas and oil industry thrives on your ignorance,” he said.

Vera Scroggins, who lives near Dimock Township, told meeting attendees “whatever you saw in that film, we have it in Susquehanna County. … We have 30 families who can’t drink their water because their wells are contaminated (with benzene),” she said, adding that the gas company drilling nearby denies responsibility, even though the company eventually provided water buffaloes to the families.

Dr. Gere Reisinger, of Kingston, said he owns 200 acres in Wyoming County and compared an energy company that began drilling a mile away to a terrorist because of the noise involved. He fears the 100 artesian wells and trout stream on his land are now in jeopardy

Dr. Tom Jiunta, a founding coalition member, said a major concern is that wells planned in the Back Mountain are less than two miles from the Huntsville and Ceaseville reservoirs, and their pollution would be disastrous.

Several people said the state should impose a moratorium on drilling as New York did until an environmental impact study can be completed.

State Rep. Karen Boback, R-Harveys Lake, and state Sen. Lisa Baker, R-Dallas, encouraged residents to urge legislators to vote for legislation aimed at protecting communities from drilling accidents and exploitation.

Baker said any severance tax revenue should stay in communities to address safety and infrastructure issues rather than “be in a pipeline to Harrisburg.”

Copyright: Times Leader

Natural gas captured from organic shale formations is not new to the oil and gas industry; shale gas has been produced since the early 1800s (DOE, 2009).  Most shale gas formations have historically been deemed economically impractical to drill due to the available technology and relative abundance of domestic conventional natural gas sources.  However, recent technological advances in horizontal drilling and hydraulic fracturing along with increasing demand for natural gas and recent price trends for natural gas, have allowed previously inaccessible reserves to become technologically feasible and economically efficient to recover (DOE, 2009).

The Annual Energy Outlook for 2009, recently released by the United States’ Energy Information Administration, projects an increase of 0.5% total primary energy consumption annually through 2030 (EIA, 2009).  The majority of this demand increase will come from the residential sector’s demand for additional electricity (EIA, 2009).  Currently, coal-fired electricity generation dominates the electricity generation sector at approximately 49% of total U.S. domestic generation capacity (EIA, 2009).  However, due to emerging concerns and public policy developments regarding greenhouse gases and renewable portfolio standards for a sustainable energy supply, lower carbon energy sources needed for electricity generation are expected to gain marketplace demand (EIA, 2009).  Unfortunately, conversion from a fossil fuel-dependent energy economy to a low-carbon energy economy will take time and significant capital investment for infrastructure development (DOE, 2009).  A recent Wall Street Journal article cites Carl Pope, executive director of the Sierra Club as viewing natural gas as a “bridge fuel” from carbon-intensive fossil fuels, such as coal and petroleum, to cleaner future fuel sources (Casselman, 2009).

In order to meet the expected increased demand for natural gas without increasing dependence on foreign imports, development of domestic unconventional natural gas sources will need to grow rapidly.  Production from unconventional natural gas sources, namely organic shales, tight sand formations, and coal-bed methane, currently account for approximately 50% of the total domestic natural gas production (DOE, 2009), this total production from unconventional resources was estimated at 8.9 trillion cubic feet (Tcf) per year in 2007 (ALL, 2008c).  Of the 8.9 Tcf of unconventional natural gas produced in the United States in 2007, 1.2 Tcf was from shale formations; however, shale gas production is expected to grow to 4.2 Tcf by 2030, accounting for an estimated 18% of the total U.S. gas production in 2030.  Unconventional sources combined are predicted to grow to nearly 56% of total U.S. domestic natural gas production (EIA, 2009).  To date, four evolving shale gas plays (Haynesville, Marcellus, Fayetteville and Woodford) are estimated to have over 550 Tcf of total recoverable gas resources, these formatiosn are expected to be capable of providing sustainable production of 2-4 Tcf of natural gas annually for decades (DOE, 2009).  Of these four, the Haynesville Shale and Marcellus Shale may have the most significant additions to domestic reserves of natural gas in recent decades.

Copyright: GoMarcellusshale.com