Oil recovery technology and its application in edge-bottom water heavy oil reservoir in Ying 13 fault-block

Ying 13 fault-block,as a lithology-structure heavy oil reservoir with edge-bottom water,has low production when producing by straight hole because of the large producing pressure and the high water cut with cold producing method.Through technology demonstration,the development mode has been transformed,four horizontal wells on the high position of the structure have been deployed for thermal recovery.By optimizing technology,HNDS technology has been formed,which consisted by horizontal well technology,dissolver technology,nitrogen foam technology and steam technology.Good development results-13.7 tons of single well have been achieved at the beginning of the thermal recovery.It will be of great significance to the development of the similar reservoirs.