BAKERSFIELD, Calif. (AP) — Chevron says an 800,000-gallon oil spill in Central California may have started when crews tried to recap an abandoned well. KQED News says the company held a briefing Friday about the seepage that began in May in a Kern County oil field west of Bakersfield. Chevron says it believes the spill stemmed from efforts to remove aging cement plugs from its non-producing wells and replace them. The company says that the initial flows came from a previously damaged well that was being re-entered.