| 摘要 |
1359155 Wells etc; revetments; barrier walls DOW CHEMICAL CO 14 May 1971 [8 June 1970] 15087/71 Headings E1F and E1H The mobility of fluids in porous formations is controlled by introducing therein an aqueous colloidal dispersion of an insoluble inorganic compound which has been prepared in situ in an aqueous solution of at least 0.005 wt% synthetic organic polymeric polyelectrolyte, which polyelectrolyte has a viscosity of at least 4 centipoises for a 0.5% solution in distilled water at 25‹C. The inorganic compound preferably comprises 0.5-80 ppm by weight of the final composition, and may be a sulphide of Fc, Ni, Cu, Hg, Zn, Cd, Co, Sn or Pb, or a hydroxide of Al, Cr, Fe, Cd, Co, Ni, Cu, Sn or Zn. The polyelectrolyte may be polyacrylamide or a hydrolysed polyacrylamide. The dispersion may be introduced into the formation by e.g. forcing it down a well bore and towards another bore in the same formation, or placing it along the upstream face of an earthen dam. A slurry of finely divided SiO 2 , MgO, MgCO 3 , MgSiO 4 , CaCO 3 , CaSiO 4 , Mg(OH) 2 , or Ca(OH) 2 may be added simultaneously with the dispersion. |
