Development of the remaining oil in Gunan 131 fault-block reservoir in the later stage of high water cut

In order to increase the recovery factor of Gunan 131 fault block reservoir, some work, such as fine research of reservoir, understanding remaining oil distribution, is done. Based on these, some measures are introduced by which the potentiality of the remaining oil of the fault block reservoir is further tapped. They are combination plug removing technology, hydraulic cutting fracture technique, perfecting injection production pattern, optimizing production parameters etc. Field tests show that the measures obviously improve the result of water flooding, the recovery factor of the fault block reservoir is increased from 24.8% to 29.0%. The successful experience obtained from the development of the reservoir can be used for reference in the later development of similar reservoirs.