Intelligent nano-microsphere profile controlling and flooding oil production improver and preparation method thereof

Abstract

The invention relates to the technical field of water injection profile controlling and flooding agents in low-permeability oilfields, and concretely relates to an intelligent nano-microsphere profilecontrolling and flooding oil production improver and a preparation method thereof. The oil production improver can improve the water flooding effect of the low-permeability oilfields, and maximally uses remaining oil to achieve oil increase and water reduction and increase the oil production. 100 parts of the intelligent nano-microsphere profile controlling and flooding oil production improver comprise, by weight, 30-40 parts of kerosene, 10-20 parts of an emulsifier, 20-30 parts of acrylamide, 0.1-0.5 part of a crosslinking agent, 0.1-0.5 part of an initiator, 0.1-0.5 part of a catalyst, 5-10 parts of a surfactant, and the balance of deionized water. The oil production improver is prepared by the certain preparation method.

Description

technical field [0001] The invention relates to the technical field of low-permeability oilfield water flooding control and displacement agents, in particular to an intelligent nanometer microsphere control and displacement enhancement agent and a preparation method thereof. Background technique [0002] Changqing Oilfield has gradually stepped into the medium-high water-cut development stage. The main oil layers generally see water, the water cut rises faster, and the oil production decline increases. In order to increase and stabilize production, advanced water injection and fine water injection techniques are generally adopted. However, the efficiency of water flooding is gradually decreasing, and the degree of enrichment of local remaining oil is still high, which cannot be effectively produced. It is increasingly difficult to control water, stabilize oil and tap potential by relying on a single injection-production control method. Multiple rounds of deep profile control...

AI Technical Summary

Problems solved by technology

For example, inorganic materials can be used to block large seepage channels, but they are prone to precipitation, usually at a distance of several meters near the wellbore; the cross-linking agent in the weak polymer gel is easily absorbed by the formation, and is separated from the polymer to break the gel , and the cross-linking reaction is affected by water quality, resulting in difficulty in gelling and low reliability; due to the large initial diameter of bulky particles, the pressure rises too fast during injection and cannot enter the deep formation; foam construction is difficult and costly, due to Water goes down, and gas goes up. When the gas is injected later, it often fails to foam, and the stability of the foam is poor under high temperature and high salt conditions.

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