All of that oil field activity in South Texas is adding up to lots of new wells.In the last four quarters, operators have drilled 4,092 new wells in the Eagle Ford Shale, according to a new quarterly count of U.S. wells from Baker Hughes.

In the second quarter of this year, there were 1,050 new Eagle Ford wells – which means each rig working in the region drilled 4.56 wells.The quarterly well count is a new measure from the Houston-based Baker Hughes, which also releases a rig count on Fridays.There were 9,061 wells in the Permian Basin in West Texas in the last four quarters – by far the biggest number of new wells in the U.S.The Williston Basin also known as the Bakken Shale in North Dakota and eastern Montana had 2,357 wells. The Marcellus Shale in Pennsylvania had 1,801 new wells in the last four quarters. And the Mississipian Limestone, an oil field in Kansas, had 1,316 new wells.Rising prices: Energy rigs advance as crude oil prices prompt more drilling.

Putting both the rig count and the well count together should show how quickly companies are able to drill in various fields around the U.S.While the Eagle Ford was averaging 4.56 wells per rig, the U.S. average was 5.2 land wells for each rig.

via Fuel Fix » New wells proliferate across the Eagle Ford Shale.