Editing Hubbert peak theory (section)

===Use of multiple curves===
{{Expand section|date=June 2008}}
The sum of multiple Hubbert curves, a technique not developed by Hubbert himself, may be used in order to model more complicated real life scenarios. When new production methods, namely [[hydraulic fracturing]], were pioneered on the previously unproductive oil-bearing Shale formations, the sudden, dramatic increase in production necessitated a distinct curve. Advances in technologies such as these are limited, but when a paradigm shifting idea impacts production and causes a need for a new curve to be added to the old curve, or the entire curve to be reworked. It should be noted, & it is well documented, that production from shale wells are unlike that of traditional well.  A traditional oil well's rate of decline is shallow, & exhibits a slow, predictable rate of decline as the reservoir is drawn down (Drinking of Milkshake). Whereas production from shale wells, assuming successful fracturing, will see its peak production at the moment the well is brought in, with a drastic rate of decline shortly thereafter.  However, one revolutionary aspect of these types of production methods are the ability to refracture the well.  Production may be brought back up, to near peak levels with a reapplication of the fracturing technology to the subject formation. Once again releasing the hydrocarbons trapped tightly within the shale & allowing them to be drawn to the surface. This process allows the for an outward manipulation of the curve, simply by purposefully neglecting to rework the well until the operator's desired market conditions are present.  <ref>{{cite web|url=http://dieoff.org/page191.htm|title=The Hubbert curve : its strengths and weaknesses|last=Laherrère|first=J.H.|date=Feb 18, 2000|website=dieoff.org|access-date=September 16, 2011|archive-url=https://web.archive.org/web/20181009083419/http://www.dieoff.org/page191.htm|archive-date=October 9, 2018|url-status=dead}}</ref>