A well fall catcher

Abstract

The invention provides a well falling object catcher, which comprises: a cylinder body; an upper joint connected to the upper part of the cylinder body; slips, arranged in the cylinder, with clamping teeth on the inner wall of the slips; a pressing plate, which is arranged in the cylinder and It is located above the slips; the coil spring is arranged between the upper joint and the pressure plate; the pressure plate is provided with a guide rod, the coil spring is sleeved outside the guide rod, the upper end of the guide rod penetrates upward into the upper joint, and the upper joint is provided with a guide rod perforation The upper joint is also provided with an insertion hole for the disassembly rod to be inserted radially, the insertion hole is communicated with the guide rod through hole, and the guide rod is provided with a matching structure matched with the disassembly rod. Beneficial effect: when the dismantling rod is pulled upward, the guide rod moves upward with the pressing plate, releases the pressing on the slips, resets and opens the slips upwards, and separates them from the salvage head on the falling object. A chute is set on the body to ensure that the structural strength of the cylinder is not affected; the dismantling rod is not connected to the overshot, which will not increase the lateral size of the overshot and ensure that the adaptability of the overshot is not affected.

Description

technical field [0001] The present invention relates to a well falling object catcher. Background technique [0002] At present, in-well hangers are commonly used for pressure testing and in-well corrosion coupon monitoring in domestic oil and gas wells, and the upper fishing head is mainly a cone (such as figure 1 shown), hemispheres (such as figure 2 shown), cylinders (such as image 3 (shown) type structure, they all have a stepped surface, which are cone stepped surface 1, hemispherical stepped surface 2, and cylindrical stepped surface 3, so special fishing devices are required to hook the stepped surface to fish out the well. In addition, in the process of oilfield operations, broken sucker rods, pump cores and other objects often fall to the bottom of the well, causing downhole accidents. In order to avoid affecting oil production, it is also necessary to use salvage devices to salvage these falling objects. [0003] The Chinese utility model patent with the autho...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned overshot can realize the rapid separation of falling objects, it is necessary to set a chute on the cylinder so that the sliding rod can pass through the cylinder and hook the slider, which will have an impact on the structural strength of the cylinder, especially As a load-bearing part that bears the weight of falling objects, the cylinder is relatively easy to deform, which affects the service life of the cylinder

In addition, in order to facilitate the lifting of the sliding rod, the end of the sliding rod needs to protrude from a part of the cylinder body, which increases the lateral size of the overshot, making it impossible for the overshot to be lowered into a well with a relatively small diameter, reducing the adaptability of the overshot

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