Tullow cuts output view,Liberian well disappoints

* Downgrades 2011 production forecasts to 79-81,000 bopd

* Montserrado well does not find oil in commercial quantities

* CFO says Jubilee field will reach plateau production in 2012

* Sees Uganda govt finally approving deal before year-end

* Shares down 6.9 percent

http://www.reuters.com/article/2011/11/09/tullowoil-update-idUSL6E7M913P20111109