Research and application of chemical segment water plugging of horizontal wells in Gaosheng oilfield

The horizontal wells in Gaosheng oilfield are all screen pipe completed wells.As there is no screening between slotted screen and rock wall,the mechanical water plugging method can only succeed in the inner space but failed in the outer space of the slotted screen,which makes it difficult on segment water plugging.Therefore,the technology on liquid bridge plug has been studied.By using the temporary plugging slug to block the water shutoff formation and protect the oil producing layers and then carry out steam injection to deplug for production.In the end,the pharmaceutical formulations on liquid bridge plug,strong gel sealing agent and inorganic water shutoff agent with double excitations have been developed and the field application achieved good effects.