Standard HA Decline Rates - Are they based on chokes being left at their original settings?

I notice on old well data that some operators open up chokes after only a few years where as some tighten the chokes and others leave them alone.  Are the standardized HA decline rates based on chokes being left alone or some other format? 

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Oil & Gas ProPermalink Reply by Les Bamburg on July 4, 2011 at 7:16
Parkdota, I am down to about 150 Mcfd at the end of 30 years.  The operator will continue to produce as long as revenue exceeds incremental opex which may be a lot longer than 30 years.  Incremental opex per well may be extemely low if an operator has large numbers of producing wells in close proximity to each other.    
Permalink Reply by Parkdota on July 4, 2011 at 14:58
Incremental opex....I like that.  I would imagine with all the HA wells, CV wells, and future BO wells that a longer well life is very possible in some areas.  Sounds good to me.

landownerPermalink Reply by adubu on July 5, 2011 at 0:30
Parkdota---What's an BO Well???????

Oil & Gas ProPermalink Reply by Les Bamburg on July 7, 2011 at 2:45
Adubu - some people use BO for Bossier Shale.
Permalink Reply by Parkdota on July 3, 2011 at 6:01

Les, I guess then an operator's decline curve is projected out over a 25-30 year time frame with choke adjustments already taken in to account?   Thanks.

Permalink Reply by sweetniece on July 7, 2011 at 2:44

Just by looking at some well data on RRC website, it looks as though many HA wells with initial production at very high levels have dropped to less than 20% of their original production in less than 1 year.  Would this decline be expected to continue or level off and does anyone have any thoughts about when it should level off?  Is the life of the HA wells still expected to be around 20 years?  I've read where it might significantly less.  Thanks to all you with great knowledge on these things!


Oil & Gas ProPermalink Reply by Les Bamburg on July 7, 2011 at 2:50
SN, see the attached for two example decline curves.  The decline rate is very high in the intial year and should decrease over time stabilizing at a much lower decline rate.  Most operators are projecting a production life of 30+ years for Haynesville/Bossier Shale wells. 
Attachments:
Permalink Reply by sweetniece on July 7, 2011 at 3:52
Thanks Les B.  That's helpful.

landownerPermalink Reply by diana canady on July 8, 2011 at 3:44

Thanks for posting this example HS Well Decline Curve.  Do you have anything similar for the horizontal CV wells? 


Oil & Gas ProPermalink Reply by Les Bamburg on July 8, 2011 at 5:14
Diana, unfortunately no.
Permalink Reply by Parkdota on July 8, 2011 at 6:28
I haven't overly studied the decline of CV wells but I saw one this week per Sonris in the Holly Field of Desoto Parish that was going on 40 years of production.  If I get time I might run some numbers.

landownerPermalink Reply by diana canady on July 8, 2011 at 9:23

I should have said LCV.  The decline rate is very interesting to me on some of these wells.  Here are some specific examples to look at:

237344 (LCV)

238382 (LCV)

240080 (LCV)

235780 (CV) 

Thanks, Diana

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