Mechanical jar

Abstract

The invention discloses a mechanical jar which comprises a mandrel and an outer cylinder, wherein the mandrel is sleeved with the outer cylinder in a telescopic mode. A piston is arranged between the mandrel and the outer cylinder; the piston isolates a fluid chamber in the space between the mandrel and the outer cylinder; the piston is provided with a first flow channel and a second flow channel which are used for allowing a fluid to enter and flow out of the fluid chamber correspondingly; a shell body is further internally provided with a slip and a trigger sleeve; the trigger sleeve can slide along with the outer cylinder relative to the mandrel; the slip can be radially expanded or contracted to be attached to one of the mandrel and the outer cylinder; and an elastic energy storage part which absorbs or releases mechanical energy in the relative sliding process of the mandrel and the outer cylinder is further arranged inside the outer cylinder. The mechanical jar both has the advantages of reliability of a mechanical jar and the large tonnage of a hydraulic jar, operation is reliable, the service life is long, and the mechanical jar can meet the most jarring requirements of while-drilling clamping freeing.

Description

technical field [0001] The invention relates to a jar, in particular to a hydraulic mechanical drilling jar. Background technique [0002] During the drilling process, due to the long drilling tool assembly and complex underground geological conditions, it is inevitable that the drilling tool will get stuck during the drilling process. The use of the jar can achieve the purpose of jarring to release the stuck. The more commonly used jars are single mechanical or hydraulic, both of which have shortcomings, for example: mechanical jars have limited shock tonnage and cannot simultaneously achieve multiple tonnage jars, hydraulic jars The tonnage can reach a large tonnage shock, and different shock tonnages can be used to adapt to different stress situations. However, since there is no locking device during the lifting process, it is easy to produce false shocks, so that the shock solution cannot be achieved. purpose of the card. Therefore, the current jars cannot fully meet t...

AI Technical Summary

Problems solved by technology

The more commonly used jars are single mechanical or hydraulic, both of which have shortcomings, for example: mechanical jars have limited shock tonnage and cannot simultaneously achieve multiple tonnage jars, hydraulic jars The tonnage can reach a large tonnage shock, and different shock tonnages can be used to adapt to different stress situations. However, since there is no locking device during the lifting process, it is easy to produce false shocks, so that the shock solution cannot be achieved. card purpose

Therefore, the current jars cannot fully meet the needs of use, and it is imminent to develop new jars

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