Perhaps the oil and gas industry didn’t get the memo about how the ongoing U.S. debt ceiling crisis and government shutdown are threatening a resurgent M&A market. At least that’s the way it looks given the trio of major energy deals announced Thursday that yielded roles for a half-dozen Am Law 100 firms.

Vinson & Elkins took the lead on two of those transactions, advising PVR Partners on its $5.6 billion sale to rival natural gas pipeline operator Regency Energy Partners, and Crestwood Midstream Partners on its $750 million acquisition of Arrow Midstream Holdings.