Links dealing specifically with cement. Cement is the key to well integrity.
- - 1604 - [June 26, 2014] - The Tyee, Andrew Nikiforuk | TheTyee.ca - "Shale Gas: How Often Do Fracked Wells Leak?"
- "One of the boldest claims made by the shale gas industry goes like this: oil and gas companies have drilled and fractured a million oil and gas wells with nary a problem.
In other words fracture fluid or methane leaks are "a rare phenomenon."
But industry data disproves this dubious claim says Cornell University engineer Anthony Ingraffea, the main source for this series, who has studied the non-linear science of rock fractures for three decades. "
- - 1605 - [Jamuary 9, 2013] - Oilfield Review, Claudio Brufatto et al. - "From Mud to Cement — Building Gas Wells"
- "As demand for natural gas increases, wellbore construction across gas-bearing formations takes center stage. With few cost-effective remedial measures available, prevention of annular gas flow and sustained casing pressure is key to drilling and completing long-lasting gas wells.
The science of constructing gas wells is thou- sands of years old. Legend has it that the Chinese dug the first natural gas well before 200 BC and transported the gas through bamboo pipelines.
Subsequent well-construction history is unclear until 1821, the year of the first US well drilled specifically for natural gas. This well, in Fredonia, New York, USA, reached a depth of 27 ft [8.2 m] and produced enough gas to light dozens of burners at a nearby inn."
- - 1612 -  - Shale Resource Centre.Canada, NA - "Four Facts on Dusseault's Well Integrity Report"
- "Maurice Dusseault, along with other academic researchers, recently released a report on well integrity, which suggests that large percentages of natural gas wells are leaking methane into water supplies and into the air. Unsurprisingly, the report led to headlines like this: “Leaking natural gas wells spew methane, report warns.”
This is a very serious conclusion. However when you dig a little deeper into the report you can see that the reality is nowhere near what the headlines, or even the report itself, would make you believe. Here are four key facts to know about Dusseault’s latest study..."