Polyacrylamide/chromium gel normal-temperature static gel breaker and preparation method thereof

Abstract

The invention provides a polyacrylamide / chromium gel normal-temperature static gel breaker and a preparation method thereof. The polyacrylamide / chromium gel normal-temperature static gel breaker comprises the following raw materials in percentage by mass: 0.1-20% of peroxide, 0.05-2% of an alkaline substance, 0.01-20% of a surfactant, 0-20% of polyether, and the balance being water. The preparation method of the gel breaker comprises the steps: sequentially adding the water, the alkaline substance, the surfactant and the polyether into a reactor in proportion, adding the peroxide when the solution is cooled to room temperature, and stirring for 30 min-60 min. A use method of the gel breaker comprises the steps: putting polyacrylamide / chromium gel, the gel breaker and water into a reactor according to a mass ratio of 1:0.1-3:1, and standing for dissolving. The preparation method of the gel breaker has the characteristics of simple operation, rapid degradation, simple process and low cost. The gel breaker can be used at normal temperature, and has a wide application prospect in treatment of polyacrylamide-containing gel in an oil field.

Description

technical field [0001] The invention belongs to the technical field of chemical additives for oil recovery, and in particular relates to a polyacrylamide / chromium gel normal-temperature static breaker and a preparation method thereof. Background technique [0002] Polyacrylamide is a kind of linear water-soluble polymer compound with wide application. With the popularization of polymer flooding tertiary oil recovery technology and the increasing difficulty of oil displacement, polyacrylamide-based water shutoff technology is widely used. During the flood control construction, due to the chemical residue at the bottom and sides of the liquid distribution tank, the tank needs to be cleared every year to recycle the gelled chemical solid waste. There is no reasonable recycling method for this waste, which poses environmental risks. At the same time, the gelling stability of the control and displacement agent used is relatively strong. During the operation of the water well, the...

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Problems solved by technology

However, the oxidizing agent-reducing agent is a two-component agent, which is inconvenient to use, especially once the two-component agent is mixed, it reacts quickly and has a short persistence, while the penetration of the colloid takes a long time, so it is actually difficult to effectively break the gel. effect

[0007] The use of biotechnology to degrade polyacrylamide has also been studied, but the actual application is not mature enough

For example, the patent application publication number CN 110194572 A "A Method for Degrading Polyacrylamide in Domestic Sludge", the degradation method includes: mixing domestic sludge with a water content of 80%-85% and crushed straw in a weight ratio of 1 After putting the ratio of 1 into the fermentation tank, add MOF-Ti and high-temperature fermentation bacteria: keep the temperature of the fermentation tank at 90 ° C ~ 110 ° C, start the fermentation tank for high temperature stirring and fermentation for 2 h ~ 3 h, and the life after the fermentation is completed The sludge is spread on the ground for natural cooling and dehydration, and the decomposed harmless domestic sludge is obtained. This method requires a high temperature environment for the degradation of polyacrylamide, and the degradation is not thorough enough. In addition, the growth of microorganisms affects the water quality. It has higher requirements and is not suitable for promotion and use in oil production sites at all

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