Water-plugging profile-modifying channel-blocking technology employing heat-sensitive water-soluble gel

Abstract

The invention relates to a thermo-sensitive water-soluble gel water block sealing technique, which is used to block water in the oil field. Wherein, the invention uses thermo-sensitive reversible water-soluble gel to prepare the solution by adding modifying agent and solidifying agent, as the working substance for blocking water to be filled into the ground; and said gel can be reversible change in a certain range of temperature with the change of temperature; therefore, the it can be changed into gel or liquid in the functions of catalyst and ground temperature field (gel high-temperature and liquid in low-temperature, to block the ground and change the flow direction of water, to improve the oil extraction rate. The invention has simple process and wider application.

Description

Technical field: [0001] The invention relates to a technology for profile control by water plugging of oil-water wells and profile control of steam-injected thermal recovery wells in oilfields. Background technique: [0002] For oil fields developed by waterflooding, the most promising method to enhance oil recovery is to use physical and chemical methods to regulate seepage in formations, and increasing the sweeping range of formations by injecting fluids is the most effective method. At present, the oil-water well profile control technology used in the field has problems such as complex process, high cost, and poor selectivity. For heavy oil fields, there is serious steam channeling in the late stage of steam huff and puff, and the channeling technology currently used will cause serious damage to the target layer. At the same time, there are still problems such as insufficient sealing strength. For profile control of thermal recovery wells, there is no good technology at ...

AI Technical Summary

Problems solved by technology

At present, the oil-water well profile control technology used in the field has problems such as complex process, high cost, and poor selectivity.

For heavy oil fields, there is serious steam channeling in the late stage of steam huffing and puffing, and the currently used sealing channeling technology will cause serious damage to the target layer. At the same time, there are still problems such as insufficient sealing strength.

For the profile control of thermal recovery wells, there is no good technology at present. Therefore, there is an urgent need to study and develop oil-water well plugging and profile control technologies that can effectively solve the above-mentioned problems in oilfield development and production.