Underground falling object fishing device for oil exploitation

Abstract

The invention discloses an underground falling object fishing device for oil exploitation. The device comprises a logging instrument and a bearing cable connected with the logging instrument, the upper end and the lower end of the bearing cable on the upper side of the logging instrument are respectively provided with a fixed supporting seat; an upper fixing frame is arranged on the fixed supporting seat at the upper end; connecting rod mechanisms are symmetrically mounted at two ends of the upper fixing frame respectively; the connecting rod mechanisms rotate through a first motor; under thedriving of the two connecting rod mechanisms, the upper ends of shearing racks are close to or away from each other; the shearing racks are of a scissor type structure composed of two machine frame plates which are consistent in shape and size, the cable shearing device automatically shears cables at the joint of the cable shearing device and the logging instrument, the cables are effectively prevented from being snapped and falling off and being accumulated underground to form more than ten meters or even higher accumulation height, and great difficulty is avoided for follow-up unblocking work. After the cable is sheared off, the shearing device and the bearing cable can return to a position above a well together.

Description

technical field [0001] The invention relates to the field of downhole tools for oil exploitation, in particular to a downhole fishing device for oil exploitation. Background technique [0002] At present, with the continuous development of oil and gas field development technology, there are more and more open-hole wells in highly inclined oil and gas fields. Various tools and equipment used in the downhole need to be lowered and worked through load-bearing cables. For example, logging instruments use load-bearing cables. In the process of lowering and lifting, we often encounter irregular wellbore trajectories. The geological conditions of oil and gas field development are complex, and it is difficult to control the high-inclination, extended-reach directional well technology, and well depth trajectory. Inadequate treatment of mud and mud will result in complex wellbore environments such as unstable wellbore and poor wellbore trajectory, resulting in more obstacles and jams ...

AI Technical Summary

Problems solved by technology

[0002] At present, with the continuous development of oil and gas field development technology, there are more and more open-hole wells in highly inclined oil and gas fields. Various tools and equipment used in the downhole need to be lowered and worked through load-bearing cables. For example, logging instruments use load-bearing cables. In the process of lowering and lifting, we often encounter irregular wellbore trajectories. The geological conditions of oil and gas field development are complex, and it is difficult to control the high-inclination, extended-reach directional well technology, and well depth trajectory. Insufficient treatment of mud and mud will lead to complex wellbore environments such as unstable wellbore and poor wellbore trajectory, resulting in more logging obstructions and jams, and it is often impossible to overcome these obstacles

[0003] When the relevant tools and equipment need to be lifted up and retracted, if the card is stuck and cannot be released, the load-bearing cable is still pulled upward, which will cause the load-bearing cable to exceed its own load-bearing limit, and the cable will be broken somewhere. The connected part of the cable will eventually fall freely and accumulate at the stuck position in the well. Many wells in oil and gas exploitation are several thousand meters deep. The jamming work brings great difficulties, so we propose a downhole fishing device for oil development to solve the above problems

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