It is my understanding that Encana plans to simultaneously frack these two wells.
Is anyone aware of whether this simultaneous fracking has been attempted anywhere else (Eagle Ford/Haynesville) in the past?
Or, is this a first time thing?
I was under the impression that the simultaneous fracking meant that each would be blasted, if you will, by the water under pressure at the same time and at the same point.
If I'm understanding what you are saying, the "zipper" fracking suggests that the water pressure will be alternated from one well to the other. Intuitively, this wouldn't seem to "cause a more complex fracture," but I'm sure the experiences of Encana and others override my intuition.
Can anyone explain micro-seismic? I understand a company by that name will monitor the frack job.
Another term for it is fracture mapping. They have detectors that are listening for "mini" seismic events created by the fracture propagation through the reservoir. They can create a 3D model of the fracture geometry in which they can determine the frac width and height. This information is valueable in determing future well spacing and reservoir drainage effeciencies.
Thanks for your explanation Bulldog. That does sound like valuable info that everyone could benefit from.
As a followup question, I read that Encana has requested a modification on the Anderson 18H unit size so that it will be an "exceptionally" sized unit of something over 1200 acres from the current level of a little over 900 acres. The new drilling length is proposed to be over 10000' from the current 7500'. (I don't have the legal notice in front of me, so this info is from memory.)
The Anderson 18H as of last Friday was at a depth of around 8000'.
Can anyone offer an explanation as to why Encana would propose to change the unit size in the middle of the drilling of a well?
Also, I didn't see where the legal notice mentioned the number of fracks. I read somewhere that 30 frack points were proposed for the 7500' length. Where can I find, or does anyone know, how many frack points there will be in this new proposed 10000' length.
After the success of the 17H lateral of over 7500', they are going to push the envelope with a 10,000' lateral in an area that they have had success with in the past. From what I heard they could have drilled more lateral on the 17H but the unit size wouldn't allow it. Drilling more lateral is the cheapest bang for your buck since you are drilling at 50-100'/hr. Most of the time and money are spent getting to the lateral; once you're there each incremental foot drilled is much cheaper than the one before it.
Their frac stage spacing has been between 250-300'/stage.
Haynesville Shale Drilling & Production Units are geographic and based largely on whole sections. Owing to state regs that call for perforation points no closer to a unit boundary than 300' there is a continuous 600' zone along adjacent unit boundaries that may not be completely and efficiently fraced. Haynesville operators are experimenting with a number of unit sizes and well bore layouts in an effort to produce the most gas at the cheapest price. The TMS will likely see the same progression of experimentation with unit completion designs.
Still seems odd to change their mind in the middle of the drilling process.
But, I understand all of this is an experiement at this point.
As to the frac stages, if I am understanding correctly, they will likely have over 40 points that the 18H is fracked. Wow. 18 points in the Weyerhaueser 73H.
It will be interesting to see if the correlation between the Anderson 18H, Anderson 17H, and Weyerhauser well's production is proportional to the fracks, lateral lengths, and unit sizes.
Somewhere in the neighborhood of 33 frac stages. However there will be multiple perf clusters in each stage. How many clusters, how many individual perfs per cluster, where located within the stage and how aligned is just one completion variable. Flow studies show that not all clusters or stages in the same well bore have the same rate of flow. And some stages can screen out and have little or no flow. It's extraordinarily complex but interesting.
Where can I find the legal notice?
It was in the Southern Herald. I couldn't find it online last week, but it is possibly online now with the Mississippi Oil and Gas Board.