High-strength composite plugging system for plugging pipe flow channel and preparation method thereof

Abstract

The invention discloses a high-strength composite plugging agent material for plugging a developed pipe flow channel of an oil-water well and a preparation method thereof. The method comprises the following steps: superfine cement, hydroxypropyl guar gum, floating beads, a hydrophobic water-swelling agent and modified latex are used as main materials; the main materials form gum viscous liquid by the hydroxypropyl guar gum, and superfine cement and hydrophobic water-swelling agent particles are suspended; a system enters into the depth of a plugging purpose formation, the superfine cement particles are settled, gathered and solidified, and the pipe flow channel space is shortened; and the hydrophobic water-swelling agent particles suck a lot of water to be swelled to fill the surplus channel space, and the binding and filling type plugging of the plugging agent and the pipe flow channel is realized. In addition, the supporting effect of the modified latex and the floating beads is utilized, the superfine cement and the hydroxypropyl guar gum are isolated, and the phenomenon that the superfine cement is easy to flocculate and non-condense in a hydroxypropyl guar gum basic solution is eliminated. The site configuration process is simple, the water cement ratio is high, the amount of formed slurry is large, the cost is low, the plugging strength of the solidified system is large, and the effective acting time is long.

Description

Technical field [0001] The invention relates to a plugging agent material, in particular to a plugging agent material used for plugging pipeline flow channels developed in injection-production layers of oil and water wells. Background technique [0002] At present, most of the domestic oilfields are in the secondary oil recovery stage of water injection development. However, due to long-term water flooding and formation sand production, channeling channels (also called large pores) formed in the injection-production layer make the oil well produced water contain water. The water injection system circulates inefficiently. Moreover, with the continuous intensification of well patterns in the later stage of oilfield development (such as the development of complex fault block reservoirs in Dagang Oilfield), some well groups in the injection-production layer are spaced less than 100 meters apart, and the previously formed channeling channels dominated by high permeability zones , Has...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned oil-water wells due to the development of pipe-flow formations that lead to violent water flooding of oil wells, invalid circulation of water injection systems, and conventional plugging adjustment measures cannot be effectively implemented. A new type of plugging agent material and its preparation method for plugging the pipeline flow channels developed in the injection-production layer of oil-water wells