Magnesium alloy for anti-scouring easily-decomposable fracturing bridge plug system and preparation and machining method thereof

Abstract

The invention discloses a magnesium alloy for an anti-scouring easily-decomposable fracturing bridge plug system and a preparation and machining method thereof. The preparation method of the magnesiumalloy comprises the following steps that (1) a magnesium alloy raw material is selected, and the magnesium alloy raw material is machined into powdery or ship-shaped particles; (2) the machined magnesium alloy raw material is subjected to secondary ball milling treatment, and one or more of Si, Cu, Fe, Al, Zn, SiO2 and SiC are doped in the ball milling process to obtain magnesium alloy chips of which the particle difference is within 5%-30% and the total mesh number is 12-100; (3) the magnesium alloy chips are put into a sleeve to be subjected to rotary centrifugal treatment, and the vibration effect is matched; (4) a treated blank is subjected to cold isostatic pressing treatment; (5) the blank subjected to cold isostatic pressing treatment is heated, vacuumizing is carried out again, and meanwhile hot isostatic pressing is carried out; and (6) the blank is taken out, and then directly extruded on an extruder to obtain a magnesium alloy bar. A bridge plug prepared through adopting the magnesium alloy can be used in the exploration process of oil-gas fields with impact environments and a large amount of silt environments.

Description

technical field [0001] The invention relates to a magnesium alloy for an anti-scouring and easily decomposable fracturing bridge plug system and a preparation and processing method thereof, and belongs to the field of industrial magnesium alloys and new materials for oil and gas development. Background technique [0002] In the field of petroleum, fracturing refers to a method of using hydraulic action to form cracks in oil and gas layers during oil or gas recovery, also known as hydraulic fracturing. Fracturing is to artificially create fractures in the formation, improve the flow environment of oil underground, increase the production of oil wells, and play an important role in improving the flow conditions at the bottom of oil wells, slowing down interlayers and improving the production status of oil layers. Fracturing bridge plugs are produced with the emergence of permanent bridge plugs. They were formed in the 1980s. As a downhole plugging tool for oilfields, they are ...

AI Technical Summary

Problems solved by technology

Although the influence of scouring in the complex environment process was considered in the process of preparing the protective layer, the effect of the final application needs to be further investigated. Some bridge plug systems that are already in use have been damaged in advance, causing irreparable damage. Economic losses

Through systematic research, it is found that these surface protective layers have a distinctive feature, that is, they have good rigidity, but insufficient toughness. During the scouring process, they cannot buffer the impact of sand particles well, which directly leads to cracking of the film layer.