| 摘要 |
The present invention is a method and apparatus for the construction of a subsurface barrier to enable more efficient, more economical and less environmental impact of enhanced recovery of petroleum fluids from the subsurface by steam and/or solvent injection. Permeable inclusions are propagated into a portion of the formation having a Skempton's B parameter of greater than 0.95 exp(-0.04 p')+0.008 p', where p' is a mean effective stress in MPa at the depth of the inclusion. Multiple propped vertical inclusions at various azimuths and depths are constructed from multiple wells, and the inclusions intersect and coalesce. The inclusions are made impermeable by a variety of means or are used for construction of a freeze zone in the formation. For example, the proppant being of the swellable type, swells and fills the voids of the inclusions. The proppant being ceramic beads coated with an electrically conductive and heat hardenable resin, then by the passage of an alternating direction electric current between wells heats the resin, by electrical resistive heating, and the resin flows filling the voids in the inclusions and the resin hardens. The proppant being sand or ceramic beads, cold saline water is circulated between the wells to freeze the formation pore water, or low viscosity grout is injected with a time delay setting agent, or electrically conductive grout is injected and then by the passage of an alternating direction electric current between wells heats and sets the grout. |
