01956nab a2200229 4500 20260520003103.0 260224s2012 xxu ing Inglés The Effect of Hydrogen Sulfide Concentration on Gel as Water Shutoff Agent sept./oct. 2012 22/08/2013 ; 22/08/2013 6 p. ; 355-361 Traducción del resúmen del autor: For drilling and water shutoff of oil and gas reservoirs containing hydrogen sulfide (H2S), the effects of H2S on widely used gel as water shutoff agents are studied. The gels include Na2Cr2O7/Na2SO3/HPAM gel, Na2Cr2O7/(NH2)2CS/HPAM gel, Cr(III)-acetate & Cr(III)-lactate/HPAM gel and phenol formaldehyde resin/HPAM gel. The results show that: for Na2Cr2O7/Na2SO3/HPAM gel and Na2Cr2O7/(NH2)2CS/HPAM gel, the H2S as reducing agent (the reducibility is more efficient than that of Na2SO3and (NH2)2CS) can reduce Cr(VI) into Cr(III) and accelerate crosslinking reaction with HPAM in low concentration of H2S, while it can react with Cr(III) generating Cr2S3 precipitation in high concentration of H2S, for which the bulk gel can not form without Cr(III); for Cr(III)-acetate & Cr(III)-lactate/HPAM gel, H2S can prolong the gelation time and reduce the gel strength by decreasing pH value; for phenol formaldehyde resin/HPAM gel, H2S can slightly prolong the gelation time and slightly reduce the gel strength by decreasing pH value. Therefore, according to the comprehensive investigations of the effects of H2S on gel as water shutoff agents, the phenol formaldehyde resin/HPAM gel is recommended as the water shutoff agents suitable for oil and gas reservoir containing H2S. 2 Oil and Gas Science and Technology 68 ARTICULO You, Q. 53435 Mu, L. 53436 Wang, Y. 28527 Zhao, F. 53437 187851 187851 0 0 0 0 255670 BAAB BAAB 2026-03-06 200060003 0 200060003 2026-03-06 00:17:53 2026-03-06 ARTICULO