<P> On September 10 , Allen said the bottom kill could start sooner than expected because a `` locking sleeve '' could be used on top of the well to prevent excessive pressure from causing problems . BP said the relief well was about 50 feet ( 15 m ) from the intersection , and finishing the boring would take four more days . On September 16 , the relief well reached its destination and pumping of cement to seal the well began . Officials said on September 18 that the cement pumped in from the base of the well had completed the sealing of the well . On September 19 , after pressure testing , Allen declared the well `` officially dead '' . </P>
<P> On September 10 , Allen said the bottom kill could start sooner than expected because a `` locking sleeve '' could be used on top of the well to prevent excessive pressure from causing problems . BP said the relief well was about 50 feet ( 15 m ) from the intersection , and finishing the boring would take four more days . On September 16 , the relief well reached its destination and pumping of cement to seal the well began . Officials said on September 18 that the cement pumped in from the base of the well had completed the sealing of the well . On September 19 , after pressure testing , Allen declared the well `` officially dead '' . </P>
when did the bp oil spill stop leaking
when did the bp oil spill stop leaking
September 19 ,
September 19 ,