Method for water plugging and profile controlling of underground polymerization of oil exploitation sludge

Abstract

The invention relates to a method for water plugging and profile controlling of underground polymerization of oil exploitation sludge, comprising the following steps of: adding 2-7% of crylic acid, 0-3% of acrylamide, 0.2-0.6% of cross linking agent and 0.01-0.05% of initiator into 15-25% of oil exploitation sludge, injecting the mixture together with the oil field water or tap water in the ground; and subsequently generating plugging substances of solid mesh structure wrapping sludge owning to the polymerization reaction under the action of oil pool temperature, thus playing an effect of sealing the underground seams, wherein the oil exploitation sludge is a tank bottom sludge generated during the oil exploitation process of the oil field or the sludge in the sludge pool; the sludge is athin oil sludge; the cross linking agent is a polyol, a glycerin, an N, N-methylene bisacrylamide or N, N-dimethybisacrylamide; and the initiator is the alkali metal salt or the ammonium salt of a persulphuric acid. The method changes the aboveground polymerization process of the oil exploitation sludge grain profile control agent into the underground polymerization process, saves corresponding procedures and the equipment and devices, and generates the water-plugging profile control agent with high intensity and long-term effect by adjusting the concentration of the monomer.

Description

technical field [0001] The invention relates to a method for underground polymerization of oil production sludge for water plugging and profile control. Background technique [0002] Oilfield oil production sludge is a kind of waste produced in the oil production process. The traditional treatment method is landfill, which pollutes the environment and wastes resources. Current environmental regulations prohibit landfilling. The current non-landfill methods mainly include 1, pyrolysis method. 2. Profile control and water blocking method. The pyrolysis method is mainly aimed at heavy oil sludge with high oil content, and cracks the heavy oil in the sludge into usable thin oil through high temperature cracking. The profile control and water plugging method is to make the heavy oil sludge into the profile control agent used in the oil field and re-inject it into the underground oil reservoir, so as to realize the harmless and resource utilization of the sludge. Profile contr...

AI Technical Summary

Problems solved by technology

However, the method requires multiple processes in above-ground plant equipment