• Between 2,600 and 3,250 employees to be affected
• Company shares down 4.5% to $94.55
• Falling oil prices put pressure on energy companies

HOUSTON, Sept 3 (Reuters) - U.S. oil and gas producer ConocoPhillips (COP.N) , will cut 20-25% of its workforce as part of a broad restructuring, a company spokesperson said on Wednesday, after five sources told Reuters that CEO Ryan Lance detailed the plans in a morning video message.

Shares of the third-largest U.S. oil producer declined 4.5% to $94.55, outpacing a 2.6% drop in the broader S&P 500 Energy Index (.SPNY)