Inorganic-organic composite profile control water shutoff agent and use method thereof

Abstract

The invention provides an inorganic-organic composite profile control and water plugging agent and a use method thereof. The inorganic-organic composite profile control and water plugging agent is prepared from the following components in percentage by mass: 0.10 to 0.30 percent of temperature-resistant and salt-resistant polymer, 1.5 to 5.2 percent of silicon-containing compound, 0.2 to 0.5 percent of water-soluble surfactant, 0.55 to 1.25 percent of gelling time regulator, 0.25 to 0.65 percent of strength regulator, 0.10 to 0.30 percent of micro-nano particles and the balance of water. The profile control and water plugging agent provided by the invention can overcome the problems that the existing gel and gel profile control and water plugging agents are difficult to inject in an oil reservoir and the gelling time is uncontrollable, and realizes deep profile control and water plugging of the oil reservoir. The profile control and water plugging agent can be used for oil reservoirs with the temperature of 50-150 DEG C.

Description

technical field [0001] The invention relates to an inorganic-organic composite profile control and water shutoff agent for enhancing oil recovery in oil field exploitation and a method for using the same, belonging to the field of oil recovery enhancement in oil and gas field exploitation. Background technique [0002] Water flooding is an important technical means in the oilfield development process. As water flooding enters the middle and late stages, the oil field is in a stage of high water cut, and the heterogeneity of the formation is enhanced. Channeling channels will be formed in the formation, thereby reducing the sweep efficiency of water flooding, resulting in a large amount of water production and even water flooding of oil wells. In order to improve water flooding effect and enhance oil recovery, it is necessary to block the high-permeability channeling channels in the reservoir. [0003] Profile control and water plugging is to inject chemical agents into the ...

AI Technical Summary

Problems solved by technology

At present, although there are many types of profile control and water blocking agents, they still cannot meet this basic requirement at the same time.

For example: Although the existing polymer jelly and gel profile control and water shutoff agents have the characteristics of high plugging strength and good temperature resistance, the viscosity of the solution of this type of profile control and water shutoff agent is high, which leads to its The injection pressure of the mixed liquid is high, and the injection is difficult. In low-permeability reservoirs, it may even fail to inject, resulting in serious blockage near the wellbore

In addition, the main agent of this type of profile control and water shutoff agent is a polymer. Even if it can be injected into the formation smoothly, the strength of the jelly or gel formed after gelation will drop sharply due to the shear degradation of the polymer, which cannot reach the desired level. Expected plugging effect in high-permeability channeling areas

Another example: Although the existing water-soluble inorganic profile control and water shutoff agents have low viscosity and good injectability, the gelation time is short and uncontrollable, which can easily lead to blockage near the well