Method for improving the injection profile of a water injection well

Claim 1

The method defined in claim 1 wherein said solid diverting agent is dispersed in said flood water in an amount equivalent to about 0.3 to 3 pounds of said solid diverting agent particles per barrel of flood water.

Claim 4

A method for improving the injection profile of water, brine, or viscous aqueous flooding medium into a heterogeneous subterranean formation having strata of varying permeabilities penetrated by an injection well within the flooding medium injected through the injection well preferentially enters the more permeable of said strata, which comprises: determining the rate of rise in said flooding medium under quiescent conditions of particles of a water-insoluble, solid diverting agent comprised of a homogeneous solid solution of paraffin wax and polymer and having sizes within the range of about 1 micron to about one-half inch; injecting said flooding medium into said injection well at a flow rate such that the downward velocity of said flooding medium in said well exceeds the rate of rise of said diverting agent particles in the flooding medium under quiescent conditions; and while maintaining a substantially constant flow of flooding medium into said well dispersing in said flooding medium about 0.3 to 3 pounds of said particulate solid water-insoluble diverting agent per barrel of flooding medium.