ASTM Dissolvable Magnesium Alloy G97 Dissolvable Bridge Plug

High Strength Dissolvable Magnesium Alloy For Dissolvable Bridge Plugs

Introduction:

In the process of oil exploitation, well shutdown and maintenance are often caused due to the corrosion and damage of oil well casing and tubing. At present, chemical methods are still used to prevent wax, scale and corrosion of oil wells at home and abroad. Through the internal corrosion mechanism of oil wells in different blocks, adding targeted corrosion inhibitors can improve the properties of produced fluids and achieve anti-corrosion protection for downhole, wellhead branch lines, and gathering and transportation trunk lines.

The intermittent injection method has a simple process and is easy to operate, but because it requires shut-in treatment, it has a certain impact on oilfield production.

The continuous injection method mainly injects the corrosion inhibitor into the well or the tubing continuously through the bypass pipe and injection valve in the casing annulus or annular space. The wax inhibitor requires a lot of manpower, the process is cumbersome, and the corrosion inhibitor will be wasted.

Therefore, combining the advantages and disadvantages of the two methods, the slow release of soluble materials keeps the corrosion inhibitor protecting the casing in the well, and at the same time, the utilization rate of the agent can be improved, and the production cost can be greatly reduced.

At present, it is mainly used in drilling and completion tools and staged fracturing processes, forming a variety of tools such as soluble fracturing balls, soluble fracturing ball seats, soluble fracturing bridge plugs, and soluble blind plates. At present, during the application of staged fracturing technology, the fracturing ball cannot be flown back, the production diameter is small, and the drill plug is required after fracturing.

Advantage:

1. Each component in the bridge plug is fully melted within the specified time range without any residue;
2. There is one and only one sealing barrel; the inner diameter is concave, which closely matches the wellbore and is sealed 360 degrees;
3. The length is short, the pumping speed is fast, and the sectional construction period is shortened;
4. Simple structure, convenient assembly, saving a lot of manpower and time;
5. All dissolved, the longest time is not more than 7-12 days to achieve unsealing, even if the setting fails, the cost of drilling and grinding will be omitted;
6. High safety factor.

Application:

The soluble bridge plug with soluble magnesium alloy as the main material has a simple structure. The materials of the upper vertebral body, the sealing cylinder, the lower vertebral body and the lower joint are all magnesium-based alloy materials, and the dissolution rate is the same under the same environmental conditions. Accurately grasp the overall dissolution time of the bridge plug, using magnesium-based alloy materials to ensure the compressive strength, with a certain elastic deformation, and can achieve complete dissolution in the later stage; the outside of the sealing cylinder is sprayed with an alloy coating, which has high hardness and can be Ensure reliable anchoring and sealing between the outer surface of the sealing cylinder and the inner wall of the casing, and at the same time form fine particles after dissolving, which are discharged together with the backflow liquid; the structure of the sealing cylinder is ingenious, and the functions of anchoring and sealing are realized at the same time, and there is no need to separately set slips and seals, while the function is not reduced, the number of connecting parts is reduced, and the connection method is simple and reliable, which reduces the processing difficulty and manufacturing cost.

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