Downhole salvage device

Abstract

The invention relates to an underground fishing device, comprising: an overshot with a hollow interior; a filter cartridge placed in the overshot, with filter holes arranged around it; a first pumping pump, through which the drilling fluid is pumped from the overshot into the filter cylinder, and the drilling fluid is filtered and discharged through the filter cylinder; The clamping mechanism of the overshot can be adjusted to move up and down along the overshot, so that the clamping mechanism can be in an open state or a folded state, so as to clamp foreign objects in the drilling fluid. The downhole salvage device of the present invention draws the drilling fluid into the filter cartridge for filtration through the provided pumping pump, and the size of the filter hole on the filter cartridge is smaller than the size of the foreign matter, which can isolate the foreign matter in the filter cartridge. In terms of foreign objects, the clamping mechanism can clamp larger-sized foreign objects, realize the comprehensive salvage of foreign objects, and have a high salvage success rate.

Description

technical field [0001] The invention relates to the technical field of petroleum equipment, in particular to a downhole salvage device for salvaging foreign objects in a well. Background technique [0002] With the continuous extension of oilfield development time, packers are required for layered water injection and sand control construction in the later stage of oilfield development. During operation and construction, due to the existence of procedures such as unblocking of the sealed string, some packer rubbers will be removed. If it falls into the well, if the peeled rubber is not salvaged in time, a large number of scraped rubber fragments will be suspended in the wellbore, causing obstructions such as sand flushing, well drilling, perforation, etc., which is easy to run into the packer. The midway setting of the packer is triggered, resulting in misoperation, and sometimes even the phenomenon of rubber cavalry occurs, which seriously affects the maintenance-free period...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the defects of the prior art and provide a downhole fishing device, which can solve the problems that the existing downhole fishing device is not easy to fish and crush foreign matter in the drilling fluid, and the success rate of fishing is low and the fishing effect is poor.

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