WASHINGTON, May 10 (Reuters) - The United States on

Friday extended a general license allowing certain transactions

with Venezuelan state oil company PDVSA that are necessary for

wind-down operations, according to a notice posted to the U.S.

Treasury Department's website.

The general license is being extended through Nov. 15 and

covers companies including Halliburton ( HAL ), Schlumberger ( SLB )

, Baker Hughes Holdings, and Weatherford International

PLC ( WFRD ), the notice showed.