Naslov
Poly(acrylic acid) and polyacrylamide mixture as oil-well drilling fliud rheology modifiers

Autori
Marinić Pajc, Ljiljana ; Janović, Zvonimir

Izvornik
Nafta (0027-755X) 54 (2003), 11; 409-416

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
polyacrylamide; poly(acrylic acid); oil production; polyelectrolytes; polymer-polymer complex; viscosity

Sažetak
Some rheological properties of diluted water solutions of polyelectrolytes based on poly(acrylic acid) (PAA)/ polyacrylamide (PAAm) mixture differing highly in their molecular weight under oil-well drilling conditions have been examined. Depending on the polymer mixture composition, the reduced viscosity-composition diagram separates in two regions, one hydrophilic region where the polymer mixture appears an expansion of its hydrodynamic volume, and another hydrophobic region where the polymer mixture appears a compact complex conformation. The effect is much more pronaounced as the polymer mixture concentration is higher (c = 0.2 instead of , 0 g L-1). The viscosities of the PAA and PAA1/PAAm333 water solutions, increase with dilution, contrary to the behavior of nonionic polymers. However, in an water NaCl solution 1, 0 x 10-2 M L-1 a dramatical reduction of the gel-like interpolymer association region and an enlargement of the compact complex conformation region was observed. Even the slight neutralization of the poly(acrylicacid) ( 5 % and 10 %) eliminate the compact complex region and expand the gel-like interpolymer association region in the whole composition range. Shear rate dependence of the viscosity of both PAA and PAAm and their mixtures has been established under oil-well drilling conditions by using a Roller instrument at 25 oC, 150 oC and 200 oC. The obtained dependence showed a Newtonian plateau at low shear rates from 3.67 to 14.68 s-1. These findings are much more pronounced using polymer mixtures of very high molecular weight for both and also mixtures by the poly(acrylic acid) higher degree of neutralization.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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