Guiding and damping device for open hole well measuring instrument

Abstract

The invention relates to a guiding and damping device for an open hole well measuring instrument. The guiding and damping device comprises an upper connector connected with the well measuring instrument. A soft whip connecting device is suspended below the upper connector. The lower end of the soft whip connecting device is connected with a soft whip assembly downwards extending, and the lower endof the soft whip assembly is connected with a guiding head. The soft whip assembly comprises a plurality of soft whip blocks which are sequentially hinged, the sides, towards the well wall, of the soft whip blocks are soft whip block arc faces, the sides, towards the center of a well hole, of the soft whip blocks are soft whip block planes, and the upper ends of the soft whip blocks are providedwith soft whip block hinge heads upwards stretching out. The lower portions of the soft whip block planes are provided with inwards-concave soft whip block hinge nests, and the soft whip block hinge head of the soft whip block located at the lower portion is hinged into the soft whip block hinge nest of the previous soft whip block. A damping spring assembly and a plane bearing rotation mechanismare arranged in the soft whip connecting device. The guiding and damping device can reliably protect the instrument, the function of well hole searching is achieved, and the instrument can smoothly descend into the well.

Description

technical field [0001] The invention relates to a guiding and damping device for an open-hole well logging instrument, which belongs to the technical field of auxiliary tools for downhole well-logging instruments. The device can be widely used in oil well-logging construction operations in highly deviated wells and complex wells. Background technique [0002] During the logging construction process of petroleum open-hole wells, it is easy for the instrument string to encounter obstructions at the steps in the well. At present, the method of guiding heavier and lengthening is mainly used to solve the obstruction problem. But steering weighting is only suitable for simple well conditions, and the success rate of solving obstruction problems is low. When faced with highly deviated wells, complex wells, and many steps in the well, due to its low steering ability and steering sensitivity, it is impossible to guide the instrument to find the borehole, so the problem of instrumen...

AI Technical Summary

Problems solved by technology

[0002] During the logging construction of oil open-hole wells, it is easy for the instrument string to encounter obstructions at the steps in the well. At present, the method of guide weighting and lengthening is mainly used to solve the obstruction problem

But steering weighting is only suitable for simple well conditions, and the success rate of solving obstruction problems is low

When faced with highly deviated wells, complex wells, and many steps in the well, due to its low steering ability and steering sensitivity, it is impossible to guide the instrument to find the borehole, so it cannot solve the problem of instrument string resistance

[0003] In addition, when the instrument string encounters resistance in the well, it will generate a large impact force, which may easily cause instrument failure or even damage

Not only does it increase the cost of instrument maintenance or purchase, but in many cases it is necessary to run the instrument string multiple times, which prolongs the logging time, reduces logging efficiency, and leads to unpredictable downhole risks

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