Ground machine super jar

Abstract

The invention discloses a ground machine super jar. The ground machine super jar is characterized in that six pin holes with different diameters are formed in the upper portion of an upper outer cylinder, wherein the six pin holes correspond to the upper portion of a shear joint and can allow shear pins with same diameters to penetrate through, when a drilling tool sticking accident happens and downward striking is needed, the jar is connected, the shear pins penetrate through the pin holes according to the requirement for the downward striking tonnage, a drilling tool is quickly lifted from lifting subs, when the lifting tonnage is increased to the integral tonnage of the penetrated shear pins, all the shear pins are broken, a downward striking rod freely falls, the weight of the lifted drilling tool is immediately acted on a sticking point, then downward striking force is generated on the clamped drilling tool, and the stretching length of the drilling tool being lifted upwards in the process of downward striking must be smaller than the maximum jarring stretching distance generated by the situation that the shear joint drops on a buffer cushion from the shear pin holes in the process of jarring. Two circulating methods are provided for stopping jarring, one is circulation through circulating holes of circulating joints, the other is circulation after a lifting sub stretching rod is connected with a female buckle on the shear joint in a mutual tight mode. Jarring and circulation are repeated until the accident is relieved.

Description

technical field [0001] The invention relates to hitting a sticking point from the ground when a sticking accident occurs in oil drilling deep well and ultra-deep well drilling, and is used for releasing the sticking. Background technique [0002] At present, the maximum tensile strength of the ground jars commonly used in the field is only 1500kN, the jarring force is only 870kN, and the telescopic distance after jarring is only 1200mm. For this reason, it is only suitable for medium-deep wells where the stuck point is shallower than 1000m-2000m and the total weight of the drilling tool does not exceed 1500kN. However, when oil drilling occurs in deep wells and ultra-deep wells, it is necessary to hit the stuck point from the ground so that there is no suitable tool for hitting the ground when the jam is released. The stuck pipe accident that could have been relieved in a short time cannot be effectively solved in time. Complicated pipe sticking accidents caused by implemen...

AI Technical Summary

Problems solved by technology

Based on the principle that the shear pin has a certain resistance to shearing force and the shock expansion distance of the lower rod is as long as 9m and has the characteristics of super tensile strength, the jar solves the problem of common ground jars in the field at present. The defects of deep wells and ultra-deep wells are solved by shaking the ground from the ground.

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