Reusing device of through-casing down-hole measuring cable and working method of reusing device

Abstract

The invention relates to a reusing device of a through-casing down-hole measuring cable and a working method of the reusing device. The reusing device of the through-casing down-hole measuring cable adopts a first cable core, a second cable core, a third cable core and a fourth cable core of a seven-core cable to be connected with a ground system and a down-hole instrument through a power supply transformer, and adjustable alternating current of the ground system is converted to direct current to be provided to the down-hole instrument; a fifth cable core and a sixth cable core of the seven-core cable are adopted to be connected with a ground communication control system and a down-hole communication control system through a communication transformer, communication signal transmission of the ground system and the down-hole instrument is conducted, and meanwhile the fifth cable core and the sixth cable core of the seven-core cable further serve as alternating-current power supply transmission cables of a motor; and a seventh cable core of the seven-core cable is adopted to be connected with a hole mouth and a down-hole voltage acquisition plate, and transmission of a reference U electrode signal is conducted. Because the number of the cable cores of the seven-core cable is limited, the power supply and the signal can reuse the cable cores, loops are connected ingeniously by utilizing a balance principle, the signal can be transferred on the seven-core cable and the down-hole instrument can further be powered up, and balanced power supply is achieved by utilizing phantom power supply.

Description

technical field [0001] The invention relates to the field of well-ground communication systems in casing-pipe resistivity logging technology, in particular to a casing-pipe downhole measurement cable multiplexing device and a working method thereof. Background technique [0002] Well logging cables are used for well logging, perforating, coring and other operations of various oil and gas wells, and can also be used for water conservancy and hydrological surveys, coal field geological exploration, geothermal logging, etc., to detect various parameters downhole, and are ground system It is used as a connecting line for connecting with underground instruments and transmitting measurement data. [0003] The important role of logging cables is to transport various downhole instruments, transmit various signals between the ground control system and downhole instruments, and obtain the depth position of downhole information. The seven-core cable is commonly used. [0004] At prese...

AI Technical Summary

Problems solved by technology

[0005] 1. The system efficiency is relatively low and the test time is long;

[0006] 2. When the instrument is working, it cannot achieve the effect of instant collection and transmission;

[0007] 3. The influence of high emission current on the acquisition signal is too great;

[0008] 4. The filter capacitance of the DC power supply is too large, which increases the manufacturing cost and limits the operating temperature of the instrument

[0009] Among the existing technologies in this field, the Chinese utility model patent with the publication number CN201835827U discloses a multiplexing device for petroleum logging cable cores, which is used for data transmission and system power supply between ground equipment and downhole instruments, but the device The structure and effect can no longer meet the current use requirements

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