Four days after Gulfport Energy Corp. said it would buy 30,000 net acres in the Utica Shale in eastern Ohio, the company announced Thursday that the agreement has been amended to include an additional 7,000 net acres for $70 million.

The additional acreage also prompted Gulfport to revise its capital expenditures (capex) and production forecast for 2013. The Oklahoma City-based company now says it plans to spend between $415 million and $425 million on capex (up from $390 million to $410 million) and estimates production will range from 7.6-7.9 million boe, averaging 20,822-21,370 boe/d (up from 7.4-7.7 million boe, 20,274-21,096 boe/d).

Gulfport also revised the amount of investment it will make in the Utica in 2013, although the play will still receive the lion’s share of the company’s attention. Gulfport now forecasts that it will spend between $347 million and $351 million on capex in the play (up from $322 million to $336 million).

“The transaction was approved by a special committee of Gulfport’s board of directors, which engaged independent financial advisers and counsel to assist with its review,” the company said Thursday. “Gulfport intends to fund this acquisition with a portion of the net proceeds from its common stock offering that priced on Dec. 18. That offering is expected to close on Dec. 24, subject to customary closing conditions.”

On Monday, Gulfport said it had agreed to buy 30,000 net acres from Windsor Ohio LLC, an affiliate of Wexford Capital LP, for $300 million (see Shale Daily, Dec. 19). The company revised that figure to $302 million on Thursday, bringing the total value of the deal to $372 million.

Other details of the proposed sale appear unchanged from Monday. The deal excludes 14 existing wells and certain acreage surrounding each well, and it is expected to close by the end of the year. Gulfport’s working interest in the acreage will increase to 72.5%, and the company will continue to serve as operator of its acreage in the Utica. The capex figures exclude what the company may spend on Grizzly Oil Sands ULC, a Canadian oilsands project where it holds a 25% stake.

Gulfport’s position in the Utica will increase to about 137,000 gross acres (106,000 net).

The company on Thursday said it expects lease operating expenses to range $5.00-6.00/boe and general and administrative costs to be $1.50-2.50/boe. Production taxes are expected to range 8-9% of revenues, and depreciation, depletion and amortization expenses are expected to be between $33.00 and $35.00/boe.