Mechanical expansion type leaking stoppage tool and leaking stoppage method thereof

Abstract

The invention provides a mechanical expansion type leaking stoppage tool and a construction method thereof. The leaking stoppage tool comprises a feeding pipe column, a compressing and expanding mechanism, a special-shaped section bridge frame, a releasing mechanism and a bridge accessory, wherein the upper end of the compressing and expanding mechanism is connected to the feeding pipe column, the special-shaped section bridge frame is connected with the feeding pipe column and arranged outside the compression expansion mechanism, the bridge frame forms plastic deformation under the outward expansion of the compressing and expanding mechanism, the releasing mechanism is connected to the lower end of the compressing and expanding mechanism, located in the bridge frame and used for separating connection of the expanded feeding pipe column, the compressing and expanding mechanism and the bridge frame, the bridge accessory is connected to the lower portion of the bridge to assist the bridge in intercepting the leaking stoppage material, and the releasing mechanism is at least partially connected into the bridge accessory. According to the leaking stoppage tool, a supporting structure is formed in the karst cave through the bridge frame, and then a hole can be plugged by using the plugging material, so that the plugging operation of karst cave type leakage is realized.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and mainly relates to a mechanical expansion plugging tool and a construction method thereof. Background technique [0002] During oil drilling, fractures and caves in formations are often encountered. Due to the pressure difference, the drilling fluid will be lost along the fractures and caves. When the pressure of the drilling fluid column cannot balance the formation pressure, serious accidents such as well collapse, well kick, and blowout will occur, making drilling impossible. Therefore, plugging must be carried out to prevent the loss of drilling fluid. [0003] For fracture-type leakage, the conventional plugging technology realizes the plugging of fractures and cavities by filling the fractures with materials with larger particles. For large open cracks and caverns, since the particles of the plugging material are much smaller than the size of the cracks and caves, the plugg...

AI Technical Summary

Problems solved by technology

For open large cracks and cave-type leakage, because the particles of the plugging material are much smaller than the size of the cracks and caves, the plugging cement cannot be retained, resulting in the loss of the plugging material and the failure of the plugging operation

Although the plugging technology of expansion pipe can be used for plugging in karst caves, it has not been widely used due to the high cost, difficulty and slow speed of reaming operations.

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