A kind of magnetic plugging material and preparation method which can be used for fracture leakage

Abstract

The invention belongs to the technical field of oil and gas drilling engineering, in particular to a magnetic plugging material and a preparation method which can be used for fracture leakage. The present invention includes Fe 3 O 4 , latex, gelatin capsules and hollow fibers; Fe 3 O 4 , the mass ratio of latex, gelatin capsule and hollow fiber is 3~4:3:1.5:1.5~2.5, the latex will Fe 3 O 4 It can be wrapped, dried and packed into gelatin capsules, and then mixed with hollow fibers at normal temperature and pressure. Fe of the present invention 3 O 4 Under the action of the geomagnetic field at the bottom of the well, it is automatically arranged in a fixed skeleton after being magnetized, and is wrapped in the inner core Fe 3 O 4 latex on , along Fe in bottom hole fractures 3 O 4 The skeleton and trajectory are automatically stretched and anchored, realizing an active "anchoring and pulling net"; the hollow fibers expand and fill the fractures after actively absorbing the liquid in the fractures at the bottom of the well, thereby intelligently plugging different types of lost pores and fractures , to achieve the best active plugging. The gelatin capsule of the present invention is automatically melted in the process of entering the well, and the implementation is convenient.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling engineering, in particular to a magnetic plugging material and a preparation method which can be used for fracture leakage. Background technique [0002] Loss of 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 also cause a series of downhole complications such as blockage, sticking, and well collapse. If the incident is serious, it will also lead to downhole accidents such as blowouts and wellbore scrapping, resulting in significant economic losses and affecting the exploration and development process. A certain oil and gas field has many large leakage layers. 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 ho...

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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