Patent ID: 7021376

Claim:
A method of placing two, or more, effective filter/sieves or water blockage zones, at desired depths of penetration into a water producing oil/or gas reservoir such that oil and or gas production can be re-established, the method comprising: a. injecting a first carrier fluid containing a reactive partitioning chemical R 1 into the well b. injecting a spacer fluid into the well; c. injecting a second carrier fluid containing a second reactive partitioning chemical R 2 into the well, wherein the second reactive partitioning chemical R 2 can be the same as the first reactive partitioning chemical R 1 , or a different reactive partitioning chemical, which will have a different partitioning coefficient value to the partitioning coefficient value of R 1 ; d. injecting a second spacer fluid into the well; and e. injecting a gel or polymer progenitor fluid into the well.