Application of selective water plugging technology for slotted pipe horizontal well

Abstract

Chemical selectivity plugging technology is targeted to the slotted pipe horizontal wells which 70% domestic, 90% foreign horizontal wells using. However, according the practices in the field, there is low water shutoff effective because of chemistry plugging agents’ poor ability of water selectivity and plugging plans’ unreasonable. By analyzing the dynamics and PNN test data, there is a dot or segment water production section which producing water from the edge and bottom water in horizontal section. Basing on this, targeted plugging plan for well H2 is designed selecting high selective gel. Plugging construction results show that the pipe pressure climbing gently, displaying that gel DM103 can enter the reservoir deep. After reopen well H2, liquid production rate was maintained at 27 t/d, as well as oil production rate increased from 4 t/d to 20 t/d, while water cut was decreased from 75% to 25%. The success of water plugging proves the judgment of water production section and the limitation of PNN testing. In addition, a water shutoff successful demonstration is established for specific slotted pipe horizontal wells which are early in water channeling, far from the edge and bottom water in heavy oil reservoirs.