The lender may ask for the oil and gas lease to be subordinated to the mortgage. This was rarely done in the past, but a few lenders are worrying about it since the Marcellus boom. They may also want assurance that there will be no surface operations, or that they can exercise control over the extent of operations. The good news is that there are certain lenders who are comfortable with oil and gas operations and can work around existing leases. If you have small acreage, it will be easier to limit surface operations. However, with larger tracts, this may be difficult. A lawyer with oil and gas and real estate lending will probably be able to get you through the refinance process.
Clifford L. Tuttle, Jr.
Attorney at Law
The foregoing answer does not constitute legal advice and does not create a lawyer-client relationship. Answers are based upon the facts stated and may change if there are additional facts not contained in the question.