Gel breaker with high-efficiency positioning double-effect and preparation method thereof

Abstract

The invention discloses a gel breaker with high-efficiency positioning double-effect. The gel breaker is formed by mixing a mixture A and a mixture B according to a mass ratio of 1:1.5, the mixture A is composed of organic iron, fluxing agent and esters, the organic iron accounts for 1% of total mass of the mixture A, the esters account for 50-70% of the total mass of the mixture A, the rest is the fluxing agent, the organic iron is ferrocene, and the fluxing agent is petroleum ether; the mixture B is hydrogen peroxide, and the mixture B accounts for 50-60% of total mass of the gel breaker. The invention further discloses a preparation method of the gel breaker. Fracturing liquid after gel breaking by the gel breaker is low in molecular weight and little in residue, secondary damage to a bottom layer is reduced, and adding amount of the gel breaker is small, so that construction cost is saved; a unique gel breaking mode has higher oxidation and degrading capability, so that the gel breaking process is easy to control, and damage to a formation is reduced to greatest extent.

Description

technical field [0001] The invention belongs to the field of oilfield chemical fracturing fluids, and in particular relates to a high-efficiency positioning dual-function gel breaker and a preparation method thereof. Background technique [0002] In the process of oil and natural gas exploration and development, fracturing is a major measure for increasing production of oil and gas wells and increasing injection of water wells. The main purpose of adding a gel breaker to the fracturing fluid during fracturing construction is that after the liquid carries sand into the fracture, the gel breaker can quickly reduce the viscosity of the fracturing fluid, so that the polymer macromolecules can be decomposed and discharged from the fracture. Small molecules minimize damage to oil caused by water-based gels or emulsified fracturing fluids. However, in conventional fracturing, when the gel breaker is directly in contact with the jelly fracturing fluid, the viscosity of the jelly bo...

AI Technical Summary

Problems solved by technology

The liquid also maintains a high viscosity, and the high-viscosity fracturing fluid is enriched in a large amount on the proppant diversion bed, which causes the fracturing fluid residue to cause retention damage to the formation, making it difficult to flow back the fracturing fluid, thereby greatly reducing the diversion of the bottom layer ability