Drilled Wells by Operator Over Time in PA’s Marcellus

The roster of companies that drill into Pennsylvania’s Marcellus Shale is a long one:  there are 70 different operators listed on the Marcellus Spud Report at the PADEP website. Here is a list of each operator, complete with annual totals since 2005:


Marcellus Shale wells drilled by operator by year, through May 2, 2012

With the chart below, you can view the same data in a different way:


Percentage of each operator’s drilling activity by year. Please click the above image for a full sized view.

This graph is particularly useful for highlighting new operators, as well as those that are no longer drilling wells. When I show data trends for operators over time, I typically get multiple comments about mergers, acquisitions, and subsidiaries within the industry. Such comments are welcome, and yet any attempt to account for them on my end will almost certainly be incomplete, and therefore potentially misleading. For that reason, I have elected not to aggregate operators in any way, tempting though it may be to combine “Exco Resources PA Inc” and “Exco Resources PA Llc”.

Here are a few more observations about the data:

  • Atlas Resources drilled an industry-high 117 Marcellus Shale wells in 2009. The company is still active, but not on the same scale, drilling just 11 wells last year, and only four wells in the first four months of 2012.
  • The DEP has apparently made some retroactive changes to the operators for wells drilled in previous years. In this violations analysis from November, for example, Dominion Exploration and Production has 17 wells between 2006 and 2011. Now, the only Dominion well is for Dominion Trans Inc. The balance of Dominion wells was likely transferred to either Consol Gas Co or CNX Gas Co Llc, both subsidiaries of Consol Energy, which purchased Dominion’s Marcellus holdings in 2010.
  • Whatever prompted the DEP to reassign Dominion wells to other operators apparently didn’t apply for Shell’s 2010 acquisition of East Resources.  Or at least it didn’t apply for all of East’s wells–in November, East was credited as being the operator for 342 wells, while they currently are on record for 298.  Shell, which does business as SWEPI on this list, had no wells until 2011 on the November list, whereas now, they are listed as the operator for 21 wells that were spudded between 2008 and 2010.
  • With 545 wells drilled through the first 123 days of 2012, the industry is on pace to drill 1,617 Marcellus wells in Pennsylvania this year, down from 1,937 wells last year.
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