Rotating short joint for oil well logging

Abstract

The invention relates to a rotating short joint for oil well logging, which is characterized in that an upper joint is connected with a connecting member through screw threads, and a leather bag is arranged in the connecting member; a slip ring is installed in the leather bag, and a rotating joint is tightly connected with the slip ring through screws; the rotating joint is of a tapered structure, and the center of the rotating joint is provided with a through hole; and the edge of the through hole is provided with a transition step coinciding with the tapered structure, a pressure-bearing joint connected with the outside and sealing silicone oil are arranged in the through hole, and a seal ring is installed outside the silicone oil; and a pressure-bearing joint is arranged in the upper joint. The slip ring is structurally characterized in that two sides of a supporting rod are respectively fastened and connected with an end cover connected with the upper joint and an I-shaped end cover connected with the rotating joint through screws, a plurality of contact conductor rings are sleeved on a central shaft to form two electric brushes, an insulating ring is arranged between every two rings, and two sides of each ring are tightly pressed through bearings. In the invention, two ends of the rotating short joint can relatively rotate, meanwhile smooth transmission of electrical signals is ensured, the service life of well logging cables is prolonged, and the well logging reliability is improved.

Description

technical field [0001] The invention relates to a rotary nipple for petroleum well logging, which belongs to petroleum logging instruments. By using it, when the downhole instrument string rotates, the torsion force generated by the rotation of the instrument string on the logging cable can be partially removed, and the tool string can be rotated when the instrument string rotates. The torque generated on the cable is limited to an acceptable range, thereby protecting the logging cable and improving the reliability of logging. Background technique [0002] Petroleum logging equipment generally includes two parts: the ground logging system and the downhole instrument. The most critical link between the two parts is the logging cable. And upload the signals collected by the downhole instruments and downlink the commands issued by the ground system. In actual logging, there are many combined instruments, and the load-bearing capacity of the cable is relatively large. When putt...

AI Technical Summary

Problems solved by technology

[0002] Petroleum logging equipment generally includes two parts: the ground logging system and the downhole instrument. The most critical link between the two parts is the logging cable. And upload the signals collected by the downhole instruments and downlink the commands issued by the ground system. In actual logging, there are many combined instruments, and the load-bearing capacity of the cable is relatively large. When putting in the logging instrument or lifting the instrument for logging, since the lower part of the instrument string is suspended, it may rotate. In the absence of a rotating nipple, the torque of the instrument string rotation will be transmitted to the cable, and even the cable will be broken. A major accident that caused an instrument to drop into a well

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