Multifunctional friction reducers
Methods of treating a subterranean formation are described. The methods include introducing a treatment fluid that includes a friction reducing polymer (e.g., a cationic friction reducing polymer) into the subterranean formation. The cationic friction reducing polymer is allowed to degrade and release choline chloride or polyDADMAC, which can each act as a clay stabilizer.
1. A method of treating a subterranean formation comprising swellable clays, comprising:
providing a treatment fluid comprising a cationic friction reducing polymer, wherein the cationic friction reducing polymer comprises:
a diallyldimethylammonium chloride (DADMAC) block copolymer, or
at least one monomer selected from a (trimethylamino)ethyl acrylate, a (trimethylamino)ethyl methacrylate, and salts thereof;
introducing the treatment fluid into the subterranean formation;
allowing the cationic friction reducing polymer to degrade after about 0.5 to 1 hour at about 150° F. and release a degradation byproduct of the cationic friction reducing polymer; and
contacting at least a portion of the swellable clays in the subterranean formation with at least a portion of the degradation byproduct to at least partially inhibit swelling of the swellable clays.
2. The method of claim 1 , further comprising subjecting the cationic friction reducing polymer to a temperature of above 150° F. for at least 2 hours to facilitate release of the degradation byproduct.
3. The method of claim 1 , wherein the subterranean formation further comprises sandstone.
4. The method of claim 1 , wherein the treatment fluid comprises a fracturing fluid.
5. The method of claim 4 , wherein the fracturing fluid comprises water.
6. The method of claim 5 , wherein the water comprises fresh water, salt water, or mixtures thereof.
7. The method of claim 1 , wherein the treatment fluid comprises from about 0.001 percent to about 1 percent of the cationic friction reducing polymer by weight of the treatment fluid.
8. The method of claim 1 , wherein the DADMAC block copolymer comprises poly(DADMAC-co-acrylamide), or the (trimethylamino)ethyl acrylate or the (trimethylamino)ethyl methacrylate are selected from (trimethylamino)ethyl acrylate methyl chloride quaternary salt, (trimethylamino)ethyl acrylate methyl sulfate quaternary salt, (trimethylamino)ethyl acrylate benzyl chloride quaternary salt, (trimethylamino)ethyl acrylate sulfuric acid salt, (trimethylamino)ethyl acrylate hydrochloric acid salt, (triethylamino)ethyl acrylate methyl chloride quaternary salt, (trimethylamino)ethyl methacrylate methyl chloride quaternary salt, (trimethylamino) ethyl methacrylate methyl sulfate quaternary salt, (trimethylamino)ethyl methacrylate benzyl chloride quaternary salt, (trimethylamino)ethyl methacrylate sulfuric acid salt, (trimethylamino)ethyl methacrylate hydrochloric acid salt, (trimethylamino)ethyl methacryloyl hydrochloric acid salt, and combinations thereof.