Increase in Haynesville Shale Well Rate after Initial Test (5/20/10)

There have been instances when the rate reported by the operator in a press release has been greater than the rate shown in the official Well Potential Report. This is because some well rates can actually improve as the well cleans up after initial completion. One example of this phenomenon is the Walker 28 #2A Well (Ser #240119). The intial test results (2/19/10) were 13,922 Mcfd with a flowing pressure of 6760 psi on a 21/64" choke. Six weeks later (4/2/10) the same well was tested at 21,785 Mcfd with a flowing pressure of 6890 psi on a 21/64" choke. The later rate is consistent with EnCana's reported rate of 22 MMcfd for this Mid-Bossier Shale completion.

The test rate for the Rex Young 20 #H1 Well increased from 22,642 Mcfd to 23,060 Mcfd between 1/15/10 and 4/1/10. Although the flowing pressure did decrease from 8596 psi to 8041 psi, this was after the well had produced over 1.5 Bcf of natural gas.

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Permalink Reply by Sarah on May 20, 2010 at 19:50
Not dumb questions. Glad you asked! So gosh darn are you saying the production has not declined after all these months? Do you mind me asking how many months it's been producing? I've read that the gas declines sharply after 3 months.

Thanks for telling us about this phenomenon Les. Wouldn't it be great if they all did that?
Permalink Reply by Henry on May 20, 2010 at 23:49
GD,
If 120,362 mcf produces $635,232.37, your seller was getting over $5 for the gas. Can this be right?
Permalink Reply by Les Bamburg on May 21, 2010 at 3:08
GD, there is no such thing on this site as a dumb question. Hey, I learn something new every day from the "non-experts". Everyone has information that is useful to the group.

I really can't think of any other good scientific explanation although there may be one. Several operators have described how it takes a few days for the flow rate of the Haynesville Shale wells to stabilize. This is likely due to the initial flow back of frac fluid (water) and some debris to clear the flow path for natural gas thru the fractures. Some wells take longer than others to rach their max flow rate. Of course once they reach the max the rate should begin to decline unless the well has been significantly choked back (+/- 14/64" choke). Conventional wells tend to reach their max flow rate immediately because there is no frac water or fractures to clean up.

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