Study of non-equilibrium arms bridge circuit for water plugging of horizontal wells in sandstone reservoir

摘要

In view of rapid water cut increasing and poor oil recovery with banded distribution with high permeability belt in sandstone reservoir of Huabei Oilfield, the electrical bridge technique for water shut-off is proposed. Based on years practice of vertical wells and similarity in Ohm's and Darcy's laws, the electrical model involved variable resistors series/parallel instead of reservoir distribution, the arm-bridge circuit combined with signal detection. Then response of the circuit by variable water shut-off could be simulated. The results indicated that, the driving pressure and seepage quantity at mid-low permeability channel could be greatly improved by the strong in-depth water-plugging at high permeability channel(L=20～40m), and the low permeability flowrate increased to a maximum of 55.3%. Then the "gel dam" in-depth fluid diversion technique was verified by water plugging and circuit simulation. The conclusions provided a valuable guidance for horizontal wells development enhanced.