How often does this river bluff work?

[Oblivious]

Party Poker 2/4 Omaha/8 (8 handed) converter

Preflop: Oblivious is CO with J[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Oblivious raises</font>, Button calls, <font color="#666666">1 fold</font>, BB calls, UTG+1 calls, MP1 calls.

Flop: (10.50 SB) T[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, UTG+1 checks, MP1 checks, <font color="#CC3333">Oblivious bets</font>, Button calls, BB calls, UTG+1 calls, MP1 folds.

Turn: (7.25 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG+1 checks, <font color="#CC3333">Oblivious bets</font>, Button calls, BB calls, UTG+1 calls.

River: (11.25 BB) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG+1 checks, <font color="#CC3333">Oblivious bets</font>, Button folds, BB folds, UTG+1 folds.

Final Pot: 12.25 BB