Two oil and gas drillers, along with an oil and gas investor, have sued a third driller with which they had partnered for natural gas extraction in the Marcellus Shale, alleging the company overbilled two joint accounts, one by more than $2 million and the other by more than $630,000, and then failed to fully reimburse the money.

The suit was removed from the Westmoreland County Court of Common Pleas to the U.S. District Court for the Western District of Pennsylvania on Friday.