Title : 147-96-36 -- Corral Creek -- CLR -- Weydahl -- March 10, 2018
link : 147-96-36 -- Corral Creek -- CLR -- Weydahl -- March 10, 2018
147-96-36 -- Corral Creek -- CLR -- Weydahl -- March 10, 2018
For newbies: drilling units in the Bakken vary. Some are 640 acres; currently, the standard drilling unit is 1,280 acres. Overlapping drilling units of 2,560 acres are becoming the standard to capture "orphan" oil along section lines. For various operational reasons one occasionally sees 5,120-acre drilling units. With all the various sizes in drilling units, it's difficult to keep track of or "figure out" well density. We'll come back to this later.In addition to the size of the drilling units, the "Bakken" has several payzones of interest. The middle Bakken is the most familiar and is pretty much found throughout the "Bakken" in North Dakota. The middle Bakken (dolomite), right now, is the only "Bakken" formation being targeted (with some rare exceptions, but there is also the upper Bakken and the lower Bakken (shale). In addition, there is the "Three Forks" which has a small geographic footprint than the middle Bakken but is still "widespread" in the "Bakken." Some talk about the Three Forks as "pinching out" around the circumference of the "Bakken." There are four payzones of interest in the Three Forks: the upper bench (T1); the second bench (T2); the third bench (T3); and, the fourth bench (T4). Everyone agrees that T1, T2, and T3 are worth exploring. Not much has been said about T4.
In the very, very best "Bakken" some suggest as many as six horizontals will target each of the four formations/sub-formations: middle Bakken, T1, T2, and T3.
In the very, very best "Bakken" some suggest, at a minimum, (four times six =) 24 horizontal wells are likely to be running through any given section. Whether a given horizontal is spaced for 640 acres, 1,280 acres, 3,256 acres or more, some envision 24 horizontal wells running through any given section (640 acres) in the very, very best "Bakken." Some suggest as many as 40 horizontal wells could run through a given section.
How does one get to 40 horizontal wells running through one section? When one looks at a section from a golden eagle's point of view, one can imagine ten (10) horizontal wells running parallel through each of the four payzones (four times ten = 40).
In fact, some argue that in the very, very, very best "Bakken" even more than ten horizontal wells might be placed for some, but maybe not all, payzones. This was talked about frequently in older posts, various "arrays" are tagged at the list of tags at the bottom of the blog.
In a general sense, the above is accurate. There is much, much more to the story. Not everyone agrees with my exuberance but so far, after following the Bakken since 2007, it seems to hold true.
For all: it is becoming increasingly difficult to track how various areas of the Bakken -- down to the granularity of a section (640 acres) is doing. Or how to track what various operators are doing in various areas of the Bakken -- down to the granularity of a section (640 acres).
I used to do it by "families." See link at sidebar at the right to see what I mean by families. I assume I will continue to add families to the list and continue to use this method.
However, a reader suggests if I want to track the Bakken at a more granular level, at a level of a particular section (640 acres) regardless of the size of all the drilling units, I should track it by section, using this format for easier searching: township-range-section (numbers and dashes only). For example, tracking section 36 in township 147N-96W, I would simply call it "147-96-36."
I've been using a variation of that method for summarizing the monthly dockets and the daily activity report, and I am not sure if I will change the format for those reports. For consistency, I may. Time will tell.
But now, when placing an NDIC graphic on a post, I will put the new format in the subject line (when I remember).
Today, I am looking at section 147-96-36. The graphic:
The wells:
- 30362, SI/NC, CLR, State Weydahl 5-36H1, Corral Creek,
- 30363, SI/NC, CLR, State Weydahl 6-36H, Corral Creek,
- 30364, SI/NC, CLR, State Weydahl 7-36H2, Corral Creek,
- 32812, SI/NC, CLR, State Weydahl 8-36H1, Corral Creek,
- 32813, SI/NC, CLR, State Weydahl 9-36H, Corral Creek,
- 32818, SI/NC, CLR, State Weydahl 10-36H2, Corral Creek,
- 32819, SI/NC, CLR, State Weydahl 11-36H, Corral Creek,
- 23785, 400, CLR, State Weydahl 3-36H1, Corral Creek, t8/13; cum 301K 1/18; production has reached a plateau; ready for a mini-frack or a new full frack; waiting to see result of neighboring fracks;
- 23786, 691, CLR, State Weydahl 2-36H, Corral Creek, t8/13; cum 314K 1/18; ditto, #23785;
- 29555, 1,497, CLR, State Weydahl 4-36H1, Corral Creek, t7/15; cum 350K 1/18; this well is clearly better than the two wells drilled in 2013; two years younger than the 2013 wells and it had already surpassed the production of each of the 2013 wells; not yet a candidate for a mini-frack or a new full frack; waiting to see result of neighboring fracks
Now, for a little gedanken: if you were a geologist put in charge of developing a one-section parcel of land in the "Bakken," a 640-acre section. How would you proceed? I assume the first thing one needs to determine is the number of wells that will be needed to ultimately "drain" the entire 640-acre section, all four or five formations/sub-formations of the "Bakken/Three Forks."
Then, once one determines the number of wells needed, one would present that to the governing board, and if the board agreed, then the geologist would "farm out" that section to the geologists working for him/her, and would tell each to start designing a specific well.
The lead geologist would identify each needed well by some name, for example Weydahl #1, Wehdahl #2, Weydahl #3, etc.
It appears that CLR is numbering the State Weydahl wells chronologically, regardless of the formation (H, H1, H2). That's unfortunate because that doesn't give us any indication how many wells for each payzone (subtotal) and all wells in total will be drilled.
Right now, the numbering system takes us through four middle Bakken wells; four T1 wells; and two T2 wells. Clearly there will be many more than four middle Bakken horizontals running through this section.
EOG numbers their wells a bit differently in the Sanish. Looking at their numbering system, one gets an idea how many wells EOG may be planning to drill in any given section.
Idle chatter: a reader noted that CLR seems to put "all" its well on SI/NC status as soon as they are drilled. My thoughts, not ready for prime time:
It seems about 20 - 50% of wells coming off confidential list (all operators) are DUCs (SI/NC).
CLR no longer uses any hedging. My hunch is that they are "hedging" differently.
Now that the state gives them two years to complete a well, simply fulfill all contracts with refiners/pipelines, but once the contracts are met, put all new wells on SI/NC status and wait to complete them when necessary (to meet contract requirements) and/or when the spot price is right or when another operator needs oil to fulfill a contract and has come up short.
Two years is a long, long time in the oil business and CLR may be playing this to its advantage. Remember, it was the oil industry that sought the two-year rule (that produced all the DUCs) during the Saudi Surge -- never let a crisis go to waste -- now that the Saudi Surge is over, and price of WTI has recovered, the state could go back to the one-year rule, but my hunch is that "everyone" likes the two-year rule.
Why not maximize profits/royalties? And if two-year rule works, why change it back to one year?
Thus Article 147-96-36 -- Corral Creek -- CLR -- Weydahl -- March 10, 2018
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