Drop in gas pressure

Is it normal for a Haynesville shale well to start out at 8100 psi and a year later be at 3300 psi. They have choked the well down and I just wonder if fracking it again will bring back the pressure or how long will this well last. It's serial number is 239731. I would just like to know what to expect of the future of this well since my job is hanging by a very thin thread.

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Permalink Reply by FXEF on August 15, 2010 at 14:44
wpt9452,

Looks like your well is typical of the Haynesville decline rate. Below is a chart of the Chesapeake Energy - Haynesville Shale Decline Curve.

Permalink Reply by wpt9452 on August 15, 2010 at 14:50
Thanks for the information, now I wonder if they will frac the well again and if it will keep the gas flowing. It's amazing how accurate the chart is with my well.
Permalink Reply by Les Bamburg on August 15, 2010 at 15:03
GD, just to clrify the operator would not drill a new horizontal lateral in a an existing well but rather would drill an entire new well - both the vertical & horizontal section.
Permalink Reply by Les Bamburg on August 15, 2010 at 15:01
WPT, it is not technically feasible to re-frac a horizontal multi-stage frac'ed well.
Permalink Reply by FXEF on August 15, 2010 at 15:08
wpt9452,

The gas will most likely continue to flow.... just at a lower rate. I would guess about 2 MMCFD at the end of 36 months and then pretty much level off. That's what the chart above would indicate. It is my understanding that re-fracturing Haynesville shale is not a standard practice and will not increase production.
Permalink Reply by Les Bamburg on August 15, 2010 at 16:23
Electro, I hope you are not referring to our old buddy Berman since that would be a stretch to call him "industry".
Permalink Reply by Les Bamburg on August 15, 2010 at 16:20
FXEF, a shale gas well production rate does not level off but rather the decline rate should slow after 5-7 years and become exponential rather than hyperbolic. Re-fracing is not technically feasible for horizontal Haynesville Shale wells.
Permalink Reply by Skip Peel - Mineral Consultant on August 15, 2010 at 15:23
There are a number of discussion threads, some over two years old, that you may access in the GHS archives regarding the decline curve of Haynesville Shale wells. Simply use the key word, "decline curve" in your search.
Permalink Reply by Les Bamburg on August 15, 2010 at 16:16
WPT, this is typical for decline in flowing pressure. After a couple of years of production the well will have to be switched to a lower pressure gathering ssytem with compression to stay on production.
Permalink Reply by kittycatmama on August 15, 2010 at 16:32
I have a friend in prodution. He said last year that once a Haynesville well declines, that the company would go in and do something to the well to get more gas out of it. He said they would then move up to Bossier in areas with the double shale, pull the gas out of the Bossier and eventually let the 2 shales merge and finally draw that gas out.
This is all layman's terms because I don't understand this, but I remember him explaining that to me. Does any of this make sense
Permalink Reply by Les Bamburg on August 15, 2010 at 16:55
KCM, I hate to say it but I think your friend is mistaken regarding the commingling of the Bossier Shale and Haynesville Shale production as that just doesn't seem technically correct. Both shale zones require horizontal multi-zone frac'ed laterals and operators have said they intend to drill separate wells to each formation. It would be feasible to add perfs to a Haynesville Shale Well and commingle a small Cotton Valley stringer or Hosston stringer after the Haynesville Shale has produced a few years.

After the flowing pressure of the Haynesville Shale well declines to line pressure (~ 1000 - 1200 psi) switching the well to a lower pressure system should give a temporary bump up in production rate before decline starts again.
Permalink Reply by wpt9452 on August 15, 2010 at 22:48
The only reason I mentioned the re-fracturing of the well is because I read that these wells can be fractured up to 10 times. This was about a year ago when I was studying the shale gas we have here on a daily basis. I have seen a well have a work-over rig come in several times but can't say what they were doing. I really appreciate all the information everyone has given me about this. Information is power and now I feel I know what to expect from this well. It's amazing the well potential was almost 18 million cubic feet per day and I was just expecting it to do better than it is. Again, I appreciate all the help.

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