Abstract:

Waterflooding performs poorly in low-permeability reservoirs due to their low absorbing capacity and gradually increasing injection pressure.This paper takes T oilfield,a low-permeability oilfield under waterflood development program,as an example to illustrate the development of a Low-Tension System for improving waterflooding effectiveness in low-permeability reservoirs.Lab experimental result shows that the system can effectively reduce residual oil saturation,increase oil/water two-phase common seepage intervals,improve percolation behaviors,and thus enhance waterflooding efficiency in low-permeability reservoirs.

Key words: low-tension system, injection pressure, relative permeability, percolation behavior, low-permeability reservoir