Nabors Industries Ltd. fell Monday after it said lower-than-expected results in its pressure pumping, U.S. offshore and international businesses has hurt its operating income in the second quarter.

Nabors shares fell 62 cents, or 2.6 percent, to $23.41 in morning trading.

The Bermuda petroleum services company said it expects income before interest and taxes to range between $165 million and $170 million for the quarter. Analysts expected an average of $187 million, according to FactSet.

Nabors also said it expects full-year operating income to approach $900 million. Analysts expected $934.5 million.

Chairman and CEO Gene Isenberg said bad weather affected land-based operations in the U.S., including those covering the Bakken and Marcellus shale deposits. Nabors' international operation has dealt with rig upgrades, recertification efforts and civil unrest that delayed contract awards.

Its U.S. offshore business has been hampered by delays in getting permits, Isenberg said. "This situation is gradually improving, and we anticipate moderate profitability over the balance of the year and a return to more normal circumstances as we enter 2012," he said.