Well workover device and workover method

Abstract

The invention discloses a well workover device, which is used for repairing metal underground well pipes; it comprises a plugging pipe, a protective cover and a set of strong magnetic fixing modules; the outer wall of the plugging pipe is wound with expansion rubber and both ends are provided with the same thread The strong magnetic fixing module includes a non-metallic material main body pipe with a diameter smaller than the inner diameter of the well pipe. The two ends of the main body pipe are respectively provided with threads that are adapted to the threads at both ends of the plugging pipe and a suspension mechanism for hoisting. There is at least one set of movable parts evenly distributed along the circumferential direction and penetrating the pipe wall of the main body pipe, and a strong magnet is fixedly installed on the top of one end of the movable part outside the pipe wall of the main body pipe; the protective cover is made of non-metallic material, which is The inner diameter is larger than the outer diameter of the blocking pipe and the main body pipe, and the outer diameter is smaller than the inner diameter of the well pipe to be repaired, and a traction rope is connected to the protective cover. The invention also discloses a well workover method. Compared with the prior art, the present invention can conveniently and quickly realize reliable plugging of well pipe damages at a very low cost.

Description

technical field [0001] The invention relates to a well workover device, in particular to a well workover device used for repairing metal underground well pipes. Background technique [0002] Most of underground water wells or oil well pipes are made of steel pipes. Due to various reasons, such as rubbing the well wall during the running of the water filter pipe, the wire wrapping section falls off or the filter screen is damaged, the static and dynamic water level changes section corrosion, the drill bit during construction Or the rupture caused by the collision of the drill pipe, the disconnection or dislocation of the pipe connection, the sand hole or the broken hole formed by the long-term impact at a certain point of the pump pipe, which will cause problems such as water turbidity and water temperature drop in the water well or oil well. Due to the high cost of sinking wells, workovers are generally chosen. [0003] The repair of the existing metal underground well pipe...

AI Technical Summary

Problems solved by technology

Some researchers also try to use rubber pads or expandable rubber as plugging materials to seal the damaged part of the well pipe. Because the inner wall of the steel pipe is smooth, this kind of scheme may be effective in the short term, but under the long-term fluctuation of underground liquid (such as water pumping during water pumping), it may be effective in the short term. flow to form a pressure difference between the upper and lower sides), the blockage will move down, and the blocking effect will be lost

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