A kind of magnesium alloy material for oil and gas development and its preparation method and application

Abstract

The invention discloses a magnesium alloy material for oil and gas development, a preparation method and application thereof, which belong to the technical field of nonferrous metals. The composition content of the magnesium alloy material is: cerium-rich mixed rare earth: 0.5-25wt.%, Sn: 0-10wt.%; Fe: 0-10wt.%, Ti: 0-10wt.%; Ni: 0-10wt.% .%; Cu: 0~10wt.%; the balance is Mg. The tools made of the magnesium alloy material of the present invention can be used in oil wells, shale gas, and oil and gas wells for oil and gas production downhole operations, and the tools include soluble bridge plugs, soluble ball seats, fracturing balls, plugging balls, darts, etc. . The material can precisely control and predict the evolution of its mechanical properties and dissolution rate in the oil and gas well environment, establish an accurate prediction model, and directly select the most suitable composition and preparation and deformation methods for different shale oil and gas well environments, greatly shortening the delivery time cycle, ensure the safety and efficiency of oil and gas extraction, and reduce the risk and cost of production accidents.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and in particular relates to a magnesium alloy material for oil and gas development, a preparation method and application thereof. Background technique [0002] Because the standard electrode potential of magnesium is as low as -2.37V, the corrosion potential is also very low in other media (such as 0.5% NaCl solution, seawater, etc.), about -1.45V to -1.6V. In humid environment and Cl - Corrosion is highly susceptible to the conditions present, so degradation can be achieved in shale gas / oil environments. Fracturing tools such as bridge plugs, ball seats, and fracturing balls made of magnesium alloy materials can provide reliable interlayer isolation during fracturing operations such as shale oil and gas exploitation. Dissolution, no need for wellbore intervention, to achieve full-bore production of the wellbore. [0003] The oil well environment is relatively complex, including: te...

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Problems solved by technology

However, there are several problems: 1. The strength of non-rare earth magnesium alloys decreases rapidly or even softens at downhole temperatures, and the degradation rate cannot be precisely controlled; 2. Conventional rare earth magnesium alloys have high strength and high temperature resistance, but their production costs are high, and the addition of alloys The second phase generated by the elements has solid solubility in the matrix, and there is dissolution or precipitation during the preparation and deformation process. The type and quantity of the second phase cannot be accurately predicted, resulting in the degradation rate of the alloy cannot be accurately predicted and controlled; 3. In Oil and gas wells are prone to engineering accidents when fracturing tools are required to provide effective interlayer isolation due to low strength, softening or degrading too quickly to achieve effective isolation, or when fracturing tools are required to degrade quickly to achieve oil and gas production, due to strength High, the degradation is too slow and seriously affects the progress of the project

4. The above-mentioned fracturing tool materials are affected by the tissue composition, and it is impossible to establish accurate models of mechanical properties and degradation rates. They can only be used in a specific oil and gas environment. New oil and gas field environment applications require new test verification. The versatility is not strong, the delivery cycle is prolonged, the production efficiency is affected, and the production cost is increased

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