The Water Control Technique of Horizontal Well Completion Strings With an Inner-located Nozzle in a Nonhomogeneous Bottom Water Reservoir

Abstract

Horizontal well has been used successfully in small block and offshore reservoirs and reservoirs with bottom water. But with the oilfield development, horizontal well has also exposed some questions gradually. Vertical well has a long water cut production period, but water cut of the horizontal well increases dramatically after water breakthrough, which affects horizontal well development seriously. The coupled model was established and solved according to the characteristics of the completion strings with inner-located nozzle. The authors found that compared with a simple implementation of blind pipe or adjust the size of the nozzle, the implementation of external casing packer or the implementation of external casing packer in conjunction with the implementation of blind pipe (or adjust the size of the nozzle) can adjustment the production profile by a wide margin. Because the high-permeability zone is the major water flooded zone, and also the major producing zone, therefore, unduly limit of the liquid producing capacity may not be able to achieve preferable results. The best results can be obtained when coefficient of variation is about .6; the effect of these measures is not obvious when coefficient of variation is too small or too large.

Keywords:

• bottom water reservoir
• completion strings with inner-located nozzle
• heterogeneous reservoir
• variable mass flow
• water control