Zn-RE-Cu-series zinc alloy material for oil and gas exploitation and preparation method and application thereof

Abstract

The invention discloses a Zn-RE-Cu-series zinc alloy material for oil and gas exploitation and a preparation method and application thereof. The Zn-RE-Cu-series zinc alloy material comprises, by mass,0.005%-25% of RE, 0.001%-15% of Cu, 0.001%-0.5% of Mg, 0.001%-0.5% of Ni and the balance Zn and inevitable impurities. A zinc alloy fracturing tool produced by the components is used for an oil and gas well which does not need to be exploited within a long time (3-60 days) after fracturing construction is finished, the zinc alloy tool has the effect of temporarily sealing the well, when the sealing storage period is finished, the tool is completely and evenly degraded in the underground environment, and therefore the drilling, grinding and recycling procedures are omitted. The tool degradation time is controllable, the engineering difficulty is lowered, and the construction efficiency and the single well yield can be improved.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, in particular to a Zn-RE-Cu series zinc alloy material for oil and gas development, a preparation method and application thereof. Background technique [0002] In oil wells, oil and gas wells, and shale gas wells, oil and gas are exploited through horizontal well staged fracturing technology, and some tools used in the fracturing construction process, such as soluble bridge plugs, soluble ball seats, fracturing balls, and plugging Balls, darts, pressure balls, etc. can all be made of degradable materials. At present, magnesium alloy material products can provide reliable interlayer isolation during fracturing construction. After the construction is completed, they can be quickly and quickly dissolved in the formation flowback fluid environment without wellbore intervention, and the full bore of the wellbore has been put into production. There are many patents that realize the replaceme...

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Problems solved by technology

[0004] Most of the existing patents on soluble materials for tools are magnesium alloy materials, all of which are designed to achieve rapid dissolution. However, these magnesium alloy materials cannot meet the requirements of long-term storage and isolation even through surface treatment.

A small number of zinc alloys have also applied for patents for soluble bridge plugs. The application number is 201810314496.8. This patent has many components, is difficult to prepare, the interaction mechanism of alloy components is not clear, and the total dissolution time is short, so it cannot be applied to long-term storage. oil and gas well

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