| abstract |
The flow of a fluid may be diverted from a high permeability zone to a low permeability portion of a subterranean formation by use of particulates comprising a mixture of (i) at least one aliphatic polyester having the general formula of repeating units: n nwhere n is an integer between 75 and 10,000 and R is selected from the group consisting of hydrogen, alkyl, aryl, alkylaryl, acetyl, heteroatoms, and mixtures thereof; andn (ii) at least one compound of the formula: nn n n n n n n n n n n n n n or an anhydride thereof n wherein: n R 1 is —COO—(R 5 O) y —R 4 or —H; n R 2 and R 3 are selected from the group consisting of —H and —COO—(R 5 O) y —R 4 ;n provided both R 2 or R 3 are —COO—(R 5 O) y —R 4 when R 1 is —H and further provided only one of R 2 or R 3 is —COO—(R 5 O) y —R 4 when R 1 is —COO—(R 5 O) y —R 4 n n R 4 is —H or a C 1 -C 6 alkyl group; n R 5 is a C 1 -C 6 alkylene group; and n each y is 0 to 5. |