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Eagle Ford Shale Case Study

Submitted By
Words 1265
Pages 6
Muhiad Elsanousy
10/23/14
PETE 497 Special Design Problems
Dr. Hayatdavoudi
Eagle Ford Shale The eagle ford shale is one of the largest active plays in the United States and spans an extremely large swath of south Texas. Eagle Ford’s produces from a rather large range of depths ranging from 4,000 feet to 14,000 feet (KED Interests). While its incredible size is one of the things that makes it an important area of exploration and production, the fact that it produces both oil and gas makes it invaluable despite the much lower value of natural gas. Eagle Ford’s geology is composed of high carbonate shale. This makes the source rock much more brittle than traditional sandstone plays. Recent advances in drilling technology have made it possible …show more content…
This ranges from 60% to 80% compared to conventional gas reservoir decline of 25% to 40% within the first year (Hayatdavoudi). This is due to chemical makeup of the shale where it contains a large of amount of clay. The chemistry of clays makes it so that it reacts rather aggressively with water and absorbs it due to its high capillary suction pressure and this prevents the slick water from returning after fracking (Hayatdavoudi). In order to combat this issue, shale needed to be better understood quantitatively. This led to the research and development of theories that better explain the correlation between different properties of shales such as the Hayatdavoudi Hydration Index (Hayatdavoudi). Based on Dr. Hayatdavoudi’s research, shale swelling is the main culprit in the reduction of shale conductivity. This is caused by clays absorbing water and expanding enough that they simply clog up the pores and cut off pathways for the gas to travel. This causes already trapped gas to become even more difficult to extract. One of the solutions developed to combat this extreme loss of production is a method called “shale pickling.” This involves drilling the well and performing hydraulic fracturing normally but, immediately after the fluid has been pressurized into the pores, shutting in the well for a period of time. This has the effect of causing the …show more content…
The decline in production after the first month in the life of a well has significantly decreased. The chart below shows how production has changed since 2009 and it shows a clear trend towards much higher initial production rates and lower production decline after the first month. This is due to the use of proppants such as sand or other materials. These materials are used to keep the created fractures open longer and have significantly increased initial production rates. Unfortunately, this is still followed by a steep decline in production before leveling off towards a gradual decline (Energy Information

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