Magnetic plugging material capable of being used for fractured leakage and preparation method thereof

Abstract

The invention belongs to the technical field of oil and gas drilling engineering, and particularly relates to a magnetic plugging material capable of being used for fractured leakage and a preparationmethod. The composite material is prepared from Fe3O4, latex, gelatin capsules and hollow fibers, wherein the mass ratio of the components is (3-4):3:1.5:(1.5-2.5); the latex wraps the Fe3O4, the Fe3O4 is loaded into the gelatin capsule after being dried, and then the Fe3O4, the latex, the gelatin capsule and the hollow fiber are mixed at normal temperature and normal pressure. Under the action of a shaft bottom geomagnetic field, Fe3O4 is magnetized and then automatically arranged according to a fixed framework, latex wrapping an inner core Fe3O4 is automatically stretched and anchored in ashaft bottom crack along the framework and track of Fe3O4, and active anchoring net pulling effect is achieved; the hollow fibers actively absorb liquid in the cracks at the bottom of the well and then expand and fill the cracks, so that different types of leakage holes and cracks are intelligently blocked, and optimal active leakage blocking is achieved. The gelatin capsule disclosed by the invention is automatically melted when entering a well, so that the technical scheme is convenient to carry out.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling engineering, and in particular relates to a magnetic leakage plugging material which can be used for fracture leakage and a preparation method. Background technique [0002] Lost circulation is one of the most common and common technical problems in oil and gas drilling engineering. It will not only increase drilling time, lose drilling fluid, interfere with geological logging work, but may also cause a series of downhole complex problems such as obstruction, drill sticking, and well collapse. If the incident is serious, it will also lead to downhole accidents such as blowout and wellbore scrapping, which will cause major economic losses and affect the exploration and development process. The annual loss caused by well leakage in the world is more than hundreds of millions of dollars. There are many large lost zones in an oil and gas field. According to statistics, the loss of pluggin...

AI Technical Summary

Problems solved by technology

[0002] Lost circulation is one of the most common and common technical problems in oil and gas drilling engineering. It will not only increase drilling time, lose drilling fluid, interfere with geological logging work, but may also cause a series of downhole complex problems such as obstruction, drill sticking, and well collapse. Severe incidents will lead to downhole accidents such as blowout and wellbore scrapping, which will cause major economic losses and affect the exploration and development process. The annual loss caused by well leakage in the world is more than hundreds of millions of dollars.

There are many large leakage zones in an oil and gas field. According to statistics, the loss of plugging materials in a certain year is nearly 50 million yuan, and the average loss time of single well plugging is nearly 200 hours, which seriously increases the cost of drilling.

The formula and particle size selection of conventional plugging materials are subject to subjective influence, and the success rate of plugging once is very low.

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