An electromagnetic fishing system and its special cable for large-diameter engineering wells

Abstract

The invention provides an electromagnetic fishing system for large-diameter engineering wells and its special cable, including a hoisting and lifting device, a cable is wound on a reel of the hoisting and lifting device, and one end of the cable passes through the wellhead pulley bracket The pulley is connected with the conductive slip ring, the conductive slip ring is connected with the electromagnetic fishing device through the load-bearing steel wire rope, and the conductive slip ring is connected with the electromagnetic fishing device through the control wire at the downhole end; the cables include three groups of steel cables and three groups of cables. The groups of steel cables and the three groups of cables are covered in the outer protective layer, and the three groups of steel cables and the three groups of cables are alternately distributed along the circumferential direction of the cables. The present invention uses electromagnet technology to greatly enhance the maximum volume, maximum weight, and maximum catch distance of the present invention to salvage fallen objects, and the salvage success rate is higher. The layout between the steel cable and the cables of the special cable of the present invention is reasonable, and the cables in the special cable will not be squeezed and damaged when the special cable bears a relatively large load.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and relates to large-diameter engineering well fallout fishing, in particular to an electromagnetic fishing system and a special cable for large-diameter engineering wells. Background technique [0002] Although the equipment and tools used in the field of large-diameter drilling engineering are in the same line as the oil drilling industry, there is no standard system similar to API in the oil drilling industry. The two types of projects seem similar, but there is a significant difference in construction technology. Many of them come from the oil drilling industry. The machine tool can not give full play to the performance in the large diameter drilling project. If there is metal debris at the bottom of the well during the construction of a large-diameter engineering well, the construction party has to use fishing tools from the oil drilling industry. However, the original intention of th...

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an electromagnetic fishing system and its special cable for large-diameter engineering wells, so as to solve the problem of fishing caused by the absence of a matching fishing system for large-diameter engineering wells in the prior art. Difficult technical issues

[0005] Another object of the present invention is to provide a special cable for electromagnetic fishing for large-diameter engineering wells, which solves the technical problems of poor compatibility between the steel wire rope and the cable, easy damage, and insufficient service life in the prior art

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