Releasing unlocking device

Abstract

The invention relates to the technical field of drilling fishing tools, in particular to a releasing unlocking device which comprises an unlocking device body, locking rings and screws. The unlocking device body is cylindrical, a lower inner ring groove is formed in the inner side of the lower portion of the unlocking device body, a lower cone frustum hole with the upper opening smaller than the lower opening is formed in the inner side of the lower end of the unlocking device body, and the lower inner ring groove is located above the lower cone frustum hole in a spaced mode. An open groove is formed in the side wall of the unlocking device body in the axis direction, one or more outer ring grooves are formed in the outer side of the unlocking device body from top to bottom at intervals, and the locking rings capable of sealing the portions, where the locking rings are located, of the open groove are fixedly mounted in the outer ring grooves through the screws. By means of the releasing unlocking device, an instrument can be replaced and repaired through fishing releasing under the condition that a drill is not lifted, in addition, the instrument can be unlocked and released after being stuck during fishing, safe use of a cable and a fishing winch is ensured, operation is easy, time and labor are saved, the process is convenient and efficient, the operation cost can be greatly lowered, and restriction on drilling construction can be relieved.

Description

technical field [0001] The invention relates to the technical field of drilling and fishing tools, and relates to a throwing unlocker. Background technique [0002] At present, the fishing tool of the wireless directional-while-drilling (MWD) tool used in the drilling industry only has the function of locking but not withdrawing, which brings great difficulty to the fishing work. First, in directional drilling, once the in-hole instrument fails, it can only be tripped out for maintenance, which is time-consuming, laborious, and costly. Second, when the fisher grasps the instrument salvaged in the well, but finds that it is stuck in the drilling tool and cannot be raised, it can only be withdrawn by pulling off the cable, which may also damage the salvage winch and cause the cable to fall. Entering the well causes difficulties for subsequent processing. Therefore, fishing tools that cannot be withdrawn on demand will not only make the drilling construction process cumbersom...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a throwing unlocker, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problem that existing fishing tools cannot be withdrawn on demand, which not only makes the drilling construction process cumbersome, time-consuming and labor-intensive, but also has high operating costs. It also seriously restricts the speed and efficiency of drilling construction; at the same time, it is easy to cause damage to other equipment, aggravate cost input, and poor economic benefits

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