Blogroll
- ASPO The official site of the Association for the Study of Peak Oil & Gas.
- Energy Bulletin Clearing house for news regarding the peak in global energy supply.
- PowerSwitch Dedicated to raising awareness & discussion of the impending & permanent decline of cheap oil & gas supply.
- ODAC Oil Depletion Analysis Centre working to raise awareness and promote better understanding of the world's oil-depletion problem.
- Global Public Media Public service broadcasting for a post carbon world.
- Post Carbon Institute Learning to live in a low energy world.
- PeakOil.com US site and forum to educate and promote awareness of global hydrocarbon depletion.
- FEASTA The Foundation for the Economics of Sustainability
- Tradable Energy Quotas (TEQs) This website describes an effective and fair response both to climate change and oil/gas depletion
Other Blogs
User login
Personnel
Editors
Contributors
Peak Oil Primers
Archives
- August 2008
- July 2008
- June 2008
- May 2008
- April 2008
- March 2008
- February 2008
- January 2008
- December 2007
- November 2007
- October 2007
- September 2007
- August 2007
- July 2007
- June 2007
- May 2007
- April 2007
- March 2007
- February 2007
- January 2007
- December 2006
- November 2006
- October 2006
- September 2006
- August 2006
- July 2006
- June 2006
- May 2006
- April 2006
- March 2006
Vital Trivia
License
This work is licensed under a Creative Commons Attribution-Share Alike 3.0 United States License.





GAIA Host Collective
Damage from rapid production in oil wells typically relates to either:
1.) A loss of the gas in solution due to pressure drops (gas solution drive reservoirs) The result is otherwise producible oil with nothing to make it mobile. It just sits there rather than moving toward what should be the lower pressure of the producing well bore. These sorts of depleted reservoirs are often excellent candidates for water flood redevelopment.
2.) Coning of water as the rapidly produced wells draw water from deeper in the produing formation rather than producing water free oil from the top of the formation. (Water drive reservoirs) This has the effect of leaving oil behind and bypassed. In fill drilling can tap into the by passed oil, but drilling new wells is an expensive proposition.
3.) Expanding gas caps as gas comes out of solution in the reservoir. This gas sits on top of the formation where the producing oil wells are now only capable of gas production. Producing that gas causes more problems are pressures drop further (the gas cap stays in place and probably grows with the loss of energy as noted in "1" becoming a real problem. Reduced pressure can also result in finicky pump performance when the pressure drop is very localized restricting or stopping production as a "gas lock" develops in the pump. This is sometimes a big deal with low perm reservoirs. You have to be patient and let the oil come to the well bore.
4.) Overly aggressive attempts at stimulation [ill advised or overly large frac jobs and acid jobs] can lead to "breaking into water as either the well is opened to an adjacent and potentially non oil bearing zone, or a highly permiable but largely vertical streak is opened up [think of a straw going to the bottom of a drink when the good stuff is right on top -- the "Super K" zones that occasionaly are mentioned as one of the issues facing Ghawar are an example of this sort of problem.]
The point is that gas wells typically don't have these issues. Producing a gas well flat out will somtimes leave behind some oil like liquids [and some "gas wells" make quite a lot of these liquids] and overly agrressive stimulation can lead to opening up zones that are not productive just like in an oil well ... but rapid production of a gas well typically doesn't cause the same type or severity of problems as too rapid production does for oil wells.
Hardly a technical explanation, but I hope that helped.
Thanks, RW Reactionary,
Thats a quick, short and sweet summary of overproduction issues.
I think one of the great oil business moneymakers in the next 20 years will be identifing reservoirs that were abandoned early because of overproduction, and going in and reengineering them. There's a ton of Texas and Louisiana salt dome fields and shallow fields in the Ft. Worth basin, Oklahoma and California that need to be reevaluated. I suspect we can get the URR* of these fields up by 10%-20% fairly easily.
Of course, this will only help moderate the peak. Its not the size of the tank, its the size of the tap. Once original pressure has been disipated, its hard to get a huge flow again. And the lifting costs are very high, with a big expense for water treatment and disposal. Land costs are outrageous. I've got several prospects like this that I'm working up.
*URR=Ultimate Recoverable Reserves
Bob Ebersole