| 摘要 |
A method for acid effect on bottom-hole area and remote zone of bed relates to oil-gas producing industry and includes sequential pumping in of polymer solution, solution of surfactant, acid solution and again solution of SAS. Pumping in of polymer solution is performed at minimal pressure, after that one additionally pumps in solution of inhibited hydrochloric acid to install acid bath or for treatment of perforation openings. Mixture of water-soluble oil sulphonates and nonionic surfactant is used as solution of surfactant at following component ratio, wt. %: oil sulphonates 0.5-5, water soluble nonionic surfactant 0.5-5.5, fresh water – the rest. Pumping in of acid solution is carried out through sequential pumping in of water mix that contains 5-15 % of hydrochloric acid, 1-10% of boron-hydrofluoric acid and 0.5-5% of water soluble nonionic surfactant and water solution that contains 1-10% of boron-hydrofluoric acid and 0.5-5% of water soluble nonionic surfactant. Pumping in of surfactant solution is carried out at least in two portions with gradual decrease in portions of surfactant concentration, in volume that provides replacement of acid solution from stem of well to depth not less than , with following soaking of solutions in bed from 24 to 48 hours. High characteristics of replacement of residual oil are achieved. |
