This is from the Pioneer Natural Resources conference call. I would really love people to explain it - preferably word-by-word in the comments. In particular I want to understand the drivers of the pressure changes (which matters for proppants for instance) and how the four-string casing deals with the problem.
Thanks in advance:
We've mentioned this in all the slides and such, but we did fall behind operationally on our completions in the Spraberry/Wolfcamp, in large part due to unforeseen drilling delays. What happened is the delays were really the result of unexpected changes in pressure regimes in the field.
So what we've seen is increasing pressures in some of the shallow formations that means we have to mud up substantially to deal with that problem and then we immediately then are drilling into lower pressure depleted zones. And we were at the knife's edge of this really through all 2016. But these pressures have changed in a subtle manner such that we now find we had a higher percentage of what we refer to as train-wreck wells, where we have all kinds of problems with lost circulation and other issues because of this pressure change.
The easiest way to remediate this is with a drilling plan takes us from a three-string casing design to a four-string casing design. So that's exactly what we've done. We solved this issue. We have addressed it and we've done so by changing the casing design, which has proven to be very successful.
One thing it does is it does increase the well cost substantially, about $300,000 to $400,000 per well, and it does increase our time of drilling five days or so. But we're also nickel-and-diming away other costs in these wells to try to get that money back, including changing out surfactants and other things to try to reduce costs and reduce days. So we're not going to stand pat with this increase. We're going to chip away at it and reduce it.
Cumulatively, though, what happens is because we've impacted the schedule, we've also then reduced the number of POPs we're going to be completing this year by about 30. Those essentially will move into 2018. That's 100% due to these drilling delays I mentioned, which I believe we now have mitigated. But you have to also factor in the delays not only result in the deferral of wells you put on production, but also loses production days for all the wells that get delayed that are going to be POP'd in the future, particularly later in the next year. But the point is we're now dealing with that. I think we have that squared away. I have a later slide we'll talk about more detail on that.