Breitburn Energy Partners LP said it has “minimal exposure” to Lehman Brothers Holdings Inc. after the investment bank filed for bankruptcy protection earlier this week.

The Los Angeles independent oil and gas limited partnership said a Lehman affiliate is the counterparty to a 2011 oil hedge transaction, and to an interest-rate swap on a $50 million principal amount, the company said late Wednesday.

If Breitburn were to terminate the derivative contracts with Lehman Commodities and replace them on the same date with hedges with the same terms, the net cost to the partnership is estimated to be approximately $6.5 million depending on oil prices at the time.

A separate Lehman Holdings affiliate is a lender under a $900 million bank credit facility that was amended in June, but only had a $1 million commitment.

Breitburn shares were up 56 cents, or 4 percent, to $13.87 in morning trading on the New York Stock Exchange.