Piston type telescoping electrode for through casing resistivity

Abstract

The invention belongs to the field of a petroleum testing device and particularly relates to a piston type telescoping electrode for through casing resistivity. The piston type telescoping electrode for through casing resistivity comprises an electrode support (3), a piston cylinder (5) fixedly connected on the electrode support (3), a probe seat (12) provided with an electrode probe (10), a slip ring (15) and a probe righting arm (2); the two ends of the probe righting arm (2) are in pivot connection with the probe seat (12) and the slip ring (15) respectively; the slip ring (15) is slidingly sleeved with the end part of the electrode support (3); in the end part of the electrode support, the inner side of the slip ring (15) is sleeved with an arm contraction spring (1); the top end of a secondary piston (7) of the piston cylinder (5) is fixedly connected with the probe seat (12) in a matching way; the top end of the secondary piston (7) is fixedly matched with an insulating pad (9); and an insulating probe sleeve (11) is sleeved outside the electrode probe (10). The piston type telescoping electrode for through casing resistivity is difficult to damage at high temperature and has the advantages of high reliability, convenience for maintenance of electrodes and low maintenance cost.

Description

technical field [0001] The invention belongs to the field of petroleum testing devices, and in particular relates to a piston-type through-casing resistivity pushing electrode. Background technique [0002] Among the research methods of geophysical logging, electrical logging is the one with the most information, and resistivity logging is a must-measure in all logging projects. The through-casing resistivity logging technology provides a new logging technology for evaluating the remaining oil saturation and enhancing the recovery factor, and is the most advanced post-casing logging technology. [0003] The pushing electrode of the currently used through-casing resistivity logging tool adopts a bladder structure. The hydraulic system realizes the pushing and retracting of the electrode by injecting oil into the bladder to make the bladder stretch. Second, in the downhole high temperature and high pressure environment, the leather bag is very easy to be damaged, resulting in...

AI Technical Summary

Problems solved by technology

[0003] The pushing electrode of the currently used through-casing resistivity logging tool adopts a bladder structure. The hydraulic system realizes the pushing and retracting of the electrode by injecting oil into the bladder to make the bladder stretch. Second, in the downhole high temperature and high pressure environment, the bladder is very easy to damage, resulting in logging failure

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