Oklahoma

Regulators say the blowout that killed five workers on a Patterson-UTI rig in Oklahoma was the product of a slow-moving series of missed signals, misleading testing, and miscalculations that failed to control a natural gas influx.

Oklahoma regulators forced an oil and gas producer to reduce operations on a well used for disposing salt water following a large earthquake that set off a series of seismic activity in the state.

Oklahoma is tightening its rules for hydraulic fracturing after studying a new cluster of earthquakes in one of the hottest US regions for drilling.

An advisor at Newfield Exploration takes a closer look at the company’s water management operations in the Oklahoma STACK, as well as the lessons learned in its development.

Linn Energy recently sold its Williston Basin properties for $285 million. This deal brings Linn’s year-to-date total sales agreements to more than $1.5 billion as it financially restructures after bankruptcy.

It is known that a well injecting a lot of water near a big fault can lead to earthquakes. The problem is, more often than not those faults are not known until after a tremor.

Top US seismic experts say they are keeping a watchful eye on ground shaking in the state as new concerns are raised in neighboring Texas.

Officials with the Oklahoma Corporation Commission (OCC) say steps they have taken to reduce the number and severity of earthquakes across Oklahoma seem to be working

The Pawnee Nation filed a lawsuit on 3 March in tribal court in Oklahoma against 27 oil and gas producers, seeking damages for an earthquake they said was caused from man-made activity related to hydraulic fracturing.

Earthquake in Cushing, OK -- home to the largest oil storage facility in the world -- leads to further regulatory action on disposal wells in the area.