Detail of "31142-56-0"

Reference

Recovery of hydrocarbons from an underground rock formation

Recovery of hydrocarbons from an underground rock formation. Davies, David Roland; Zwolle, Simon (Shell Internationale Research Maatschappij B. V., Neth.). Ger. Offen. DE 3416388 A1 8 Nov 1984, 20 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: E21B043-22. APPLICATION: DE 84-3416388 3 May 1984. PRIORITY: GB 83-12564 6 May 1983. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) During enhanced petroleum recovery operations (esp. by steam and hot water injection) migration of SiO2 into wellbores is reduced by coinjection, or by sequential injection, of 50-5000 ppm Al3+, as AlCl3 or Na aluminate or Al citrate [31142-56-0], depending on injection conditions and desired pH. Injection of Al3+ is also helpful in combination with injection of a SiCl4 sand-consolidation compn.

Evaluation of methods of reducing permeability in porous media by in situ polymer treatments

Evaluation of methods of reducing permeability in porous media by in situ polymer treatments. Wilhite, G. P.; Green, D. W.; Young, T. S.; Thiele, J. L.; Michnick, M. J.; Vossoughi, S.; Terry, R. E. (Univ. Kansas, Lawrence, KS, USA). Report, DOE/BC/10354-16; Order No. DE86000264, 381 pp. Avail. NTIS From: Energy Res. Abstr. 1986, 11(5), Abstr. No. 8290 (English) 1986. DOCUMENT TYPE: Report CA Section: 38 (Plastics Fabrication and Uses) Section cross-reference(s): 51 This report describes a study of 2 processes used com. to crosslink polyacrylamides. Both processes are based on the controlled release of multivalent metal ions which form a crosslink of some form between polymers. The first process, called the Cr redox process, consists of the displacement of a polymer slug contg. Cr(VI), followed by a slug of polymer contg. a reducing agent. A reaction occurs when the two slugs mix, with Cr(VI) being reduced to Cr(III). The Cr(III) reacts with the polymer to form a gel. The second process, called the combination process, consists of the sequential injection of slugs contg. polymer, Al citrate [31142-56-0], and polymer followed by resumption of water injection. The research described in this report investigates these 2 methods of reducing the permeability of porous rocks using polyacrylamides. Research is conducted on properties of bulk gels as they form as well as in situ gelation in sandpacks and Berea core material. The research is organized in 6 parts: (1) characterization of gel systems; (2) correlation of gelation times and process variables for Cr(III) systems; (3) kinetics of reactions involving redn. of Cr(VI); (4) rheol. studies of gelling processes; (5) in-situ gelation of Cr(III) systems; and (6) permeability redn. with alternate slugs of Al citrate and polymer.