Formulations on the basis of raw glycerine (R), cellulose ether and urea, method for promoting crude oil from crude oil storage sites with inhomogeneous permeability and method for producing these formulations

摘要

Extracting oil from underground oil reservoirs, in which at least one injection well and at least one production well is sunk, comprises (a) injecting at least one flooding agent into the injection well and extracting oil by the production well, (b) blocking high-permeability zones of the oil reservoir in region between the injection well and production well, by injecting at least one formulation using the injection well, and (c) repeating the above step of injecting the flooding agent. Extracting oil from underground oil reservoirs, in which at least one injection well and at least one production well is sunk, comprises (a) injecting at least one flooding agent into the injection well and extracting oil by the production well, (b) blocking high-permeability zones of the oil reservoir in region between the injection well and production well, by injecting at least one formulation using the injection well, and (c) repeating the above step of injecting the flooding agent. The formulation comprises 10-99.9 wt.% crude glycerine, 0.1-3 wt.% cellulose ether and 0-60 wt.% water based on the total weight of the formulation. An independent claim is also included for preparing the formulation, comprising (i) wetting cellulose ether with water at 60-80[deg] C, to obtain a mixture, (ii) adding water to the mixture at not > 20[deg] C to obtain a solution, and (iii) adding crude glycerine to the solution to obtain the formulation. The method includes adding urea before the step (c).