As to contamination of groundwater, the fracking takes place several thousand feet below the groundwater sources, and since there must be an impermeable layer between the gas-bearing formation and the surface--or else the gas would long since have escaped--there is no communication between the fractured formation
and the ground water source.
The key to this new discovery to MSEV is that it was made in the fractured formation
that has essentially not been tested in the past.
When drilling in formations containing boulders, fractured formations
or formations that change from hard to soft and back to hard, it's useful to know when inclination of the bit changes," Crumpton said.
These oil- rich and naturally fractured formations
have many similarities to North America's Bakken source- rock formation in the successful Williston Basin.
AOK will look to re-work existing wells but the key upside is horizontal well technology that increases yield from vertically fractured formations
With each successive leg dedicated to either ridge-crest or crystalline rock drilling, ODP has gained better understanding of the problems posed by bare rock and fractured formations
Marcellus shale with multi-layered strata and multiple fractured formations
vary in depth with hardness ranging in compressive strengths of 10,000 to 30,000 psi, he said.
These oil-rich and naturally fractured formations
have many similarities to North America's Bakken Shale source-rock formation in the successful Williston Basin.
, gravels and cobbles have long presented a challenge to drilling contractors where they lose circulation of the drilling mud and do not get returns.