By Peter Auer (Eds.)
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Additional info for Advances in Energy Systems and Technology. Volume 3
53. 35. 30). If a fracture can enter sand bodies after propagating through shale, a massive hydraulic fracture has the potential of contacting two to four times as many sand bodies as might be connected to a well with no fracture or a small fracture. F. Economic Model 7. General Structure The core of the Project Economics Model is a conventional discounted cash flow (net present value) model. Its unit of analysis is the individual well and its drainage area. Constant June 1980 costs are assumed throughout.
Each resource is governed by its own geology and requires its own special technology for the recovery of the gas. The resource in place is large, on the order of thousands of Tcf, and many multiples the size of our domestic natural gas reserves. The issue in all of this is not the size but how much of the resource can be economically recovered and by when. However, with the extraction technology to date we have received only a very small portion, on the order of tens of Tcf, of this resource. With advancements in technology and some imaginative solutions the contribution of the unconventional sources could double our present natural gas reserves and provide valuable time for the transition from the age of fossil energy to the age of affordable renewable energy.
A propping agent, such as sand or bauxite, is mixed with the fluid and carried into the fracture. (In massive applications, up to two million pounds of 36 V. ) When the designed volume of fluid has been injected, pumping is stopped and the pressure decreases, allowing the sides of the fracture to grip the propping agent. Expansion of the gas near the fracture face forces the fluid out of the fracture and up the well (the cleanup phase), but leaves behind the sand to prop open the fracture. The effectively propped fracture provides a pressure sink with massive surface area and a highly permeable path to the wellbore and substantially increases the production rate in very low-permeability gas-bearing formations.
Advances in Energy Systems and Technology. Volume 3 by Peter Auer (Eds.)