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1 21 / 02 / Fév / 2011 15:39 Monday, February 21, 2011 January 21/02 / February / 2011 15:39

Shale gas begin to make much noise in the media, community networks, political debates and especially among residents of areas affected by exploration, recently granted by the government permits. Let's focus on this energy resource in order to review the e constraints on its operations and why there are concerns.

The unconventional gas

This gas is called "unconventional" because it can not be recovered with the usual extraction facilities, very similar to those used for oil (simple vertical drilling).

There are four types:

- The tight gas (on the border between conventional production and unconventional) gas contained in very low porosity and low permeability reservoirs

- Shale gas (shale gas)

- Coal gas: gas adsorbed on the coals.

- Methane hydrates: a mixture of water and methane, which under certain conditions of pressure and temperature, crystallizes to form a solid.

Shale gas

As I explained in the article on the oil formation , a conventional reservoir is a porous reservoir rock that contains the oil and gas expelled from the rock. However, these hydrocarbons are expelled after a natural fracturing as a result of the internal pressure.

The particularity of shale gas is that it is still trapped in the rock, mainly clay and therefore almost impermeable. So he did not make the migration and it is located in deep areas (1500-4500 feet). To successfully recover the gas, so it is essential artificially fractured bedrock and that the oil industry uses two techniques.


First dates experiments the mid-twentieth century. Since then, technical improvements have significantly improved the quantities recovered.

The basic technique is to inject a mixture of fluid (water in the case of hydraulic fracturing), sand and chemicals (about 1%) under high pressure (100 bar) and a high flow rate. Drilling pipes are drilled to allow the mixture to circulate throughout the well, in the geological formation.

At these locations, the mixture causes or enlarges fractures and sand is inserted inside so they do not close. Thus, the gas can escape and go back to the plateforme.Tous progress observed concern the nature of the fluid, solid retention (sand), additives and their proportions.

Source: IFP Energies nouvelles

This process is the only currently known to extract shale gas. It is now possible to achieve up to 10 or 15 fractures in the same hole (multifracking), but also come back later to take the same fracturing (workovers).

Horizontal drilling

The shale gas deposits are located in very large horizontal geological strata but fairly thick. That is why it is more advantageous to optimize recovery, implementing horizontal drilling.

utopiatools #1 Best Seller Mini Bench Drill Press Hobby Drill Press
Home Improvement (utopiatools)
  • Mini Drill Press
2006-11-30 10:48:01 by Dove2

New drill press might not be as good

There are so many older units around that are SO MUCH BETTER than newer units, it's hard to go shopping like this. But if you have to buy new and don't want to risk Craftsman or Delta, some users have given good reviews to a couple of the Harbor Freight models - such as the ITEM 38142-6VGA, a drill press with umpteen speeds and a motor that lasts more than ten minutes.
BUY LOCAL is my advice. And figure on $200 minimum if you have to buy new. The Ryobis have terrible reps for runout and Delta quality control is slipping. So's Sears. Home Depot is backing off big Ridgid tools so check twice before investing a huge amount

You might also like:

Jaguar XJ Machines Commercial - How Alive Are You | Jaguar USA

Calif. panel launches probe into offshore fracking  — Bioscience Technology
California regulators have launched an investigation into offshore hydraulic fracturing after revelations that the practice had quietly occurred off the coast for the past two decades.

A sampling of editorials from around New York  — Merced Sun-Star
In the meantime, there is no word on when the state Health Department will finish its long-overdue review of the state Department of Environmental Conservation assessment of the health impacts of the practice.

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