Automatically-crushed remigration particle gel profile-control and water-shutoff agent

Abstract

The invention relates to an autoslack remigration pearlgel water plugging control agent which belongs to oil-field injection well water plugging control agent. The chemical water plugging control agent applied to effectively control the contained water when the oil field enters the middle-late phase, has come into the phase of large-dose deep water plugging control. The performance of gel deep water-plugging control agent of chromium gel / complex-ion polymer / resin used in present technology is more excellent than common polyacrylamides gel and acrylamide monomer gel, but the lower remigration, high-deformability and delayed crosslinking can not satify the requirements, so the invention obtains the glue by adopting salt resistance polymer, temperature-resistance polypropeneamino solution with concentration of 0.05-0.4 %, 0.02-0.2 % flocculant, 0.2-0.8 % modified mylar crosslinker, and 0.01-0.1 % cellulose ether disperser, with 60-90 DEG reaction temperature of the prepared solution and 7.2-8.0 of pH value. The gel can be remigrated, have properties of dilatability, high viscoelasticity and delayed crosslinking, and the intensity can be adjusted. The said glue can form gel when injected into the well for 5-7 days, then the gel breaks up after 30 days and remigrates to the deep ground layer to plug the ground layer.

Description

Technical field: [0001] The invention relates to a profile control and water shutoff agent for automatic cracking and remigration granular gel, which belongs to the profile control and water shutoff agent for water injection wells in oil fields. Background technique: [0002] With the continuous deepening of oilfield water injection development, many oilfields are already in the development stage of medium and high water cut periods. The chemical profile control and water shutoff implemented in the prior art to effectively control the rise of water cut has entered into the large-dose deep profile control and water shutoff. At the stage of profile control and flooding, at present, the profile control and water shutoff agents used on site mainly use chromium gel / composite ion polymer / resin gel deep profile control water shutoff agent. Acrylamide monomer-based profile control and water shutoff agents have much superior performance, but due to the re-migration of the plugging ag...

AI Technical Summary

Problems solved by technology

[0002] With the continuous deepening of oilfield water injection development, many oilfields are already in the development stage of medium and high water cut periods. The chemical profile control and water shutoff implemented in the prior art to effectively control the rise of water cut has entered into the large-dose deep profile control and water shutoff. At the stage of profile control and flooding, at present, the profile control and water shutoff agents used on site mainly use chromium gel / composite ion polymer / resin gel deep profile control water shutoff agent. Acrylamide monomer-based profile control and water shutoff agents have much superior performance, but due to the re-migration of the plugging agent, high deformability and low delayed cross-linking properties during the profile control and water shutoff process, the gel cannot meet the needs of the site and still needs to be improved. Comprehensive performance can meet the needs of large-dose deep profile control, water shutoff and control and flooding in oilfields