Polymer waterflooding by controlling water hardness

Details Polymer waterflooding by controlling water hardness Polymer waterflooding by controlling water hardness

C - Chemistry, Metallurgy

09

K

31/21, 166/32

C09K 8/588 (2006.01)

Patent

CA 1042648

ABSTRACT OF THE DISCLOSURE Improved mobility control with salt-sensitive polymers having an average molecular weight large enough to effect a substantial ??duction in permeability of the formation rock, is obtained by increasing the total hardness of the polymer solution to effect a reduction in the physical size of the polymer molecules. This process effects less per- meability reduction of the formation rock, permits higher injection rates and results in a more economical recovery process. Optimum level of total hardness is dependent upon the average pore size of the formation rock, the sensitivity of the polymer to salt, desired permeability reduction, etc. Total hardness is increased by incorporating salts of Ca++ and/or Mg++. A miscible or miscible-like flooding agent may precede the polymer solution injection.

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