Large-range fishing spear and fishing method thereof
A fishing spear and a wide range of technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve problems such as downhole accidents, affecting the efficiency of accident handling, and unacceptable by customers, achieving fewer accessories, a wide range of fishing, and increased fishing range effect
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[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] Embodiment of the present invention: the structure diagram of large-scale salvage spear is as follows Figure 1~3 As shown, it includes a mandrel 1 and an upper sliding sleeve 3 and a lower sliding sleeve 6 sleeved on the mandrel 1. The mandrel 1 includes a lance 8 and an upper joint 9 and a guide cone respectively connected to the upper and lower ends of the lance 8. 7.2, the adjustment sleeve 7.1 is threadedly connected between the lower sliding sleeve 6 and the leading cone 7.2 on the lance 8, and the stroke of the lower sliding sleeve 6 is limited by the adjustment sleeve 7.1, so as to control the opening range of the split slip 4 . Four split-type slips 4 are connected between the upper sliding sleeve 3 and the lower sliding sleeve 6,...
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