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

A downhole measurement and multiplexing device technology, which is applied in measurement, electric/magnetic detection for well logging records, earthwork drilling and production, etc. It can solve the problems of large influence on acquisition signals, limited instrument use temperature, and low system efficiency. , to achieve the effect of reducing the interference of high current on signal transmission, avoiding excessive use time, and collecting accurate data

Pending Publication Date: 2017-12-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 tempera

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The through-casing downhole measurement cable multiplexing device uses a seven-core cable as the power supply cable for the ground system and downhole instruments, and uses a seven-core cable to provide working power for the acquisition and transmission of data by downhole instruments.

[0052] like figure 1 As shown, the casing downhole measurement cable multiplexing device described in this embodiment: the first cable core, the second cable core, the third cable core, and the fourth cable core (1#, 2#, 3 #, 4#) Connect the ground system and downhole instruments through a power supply transformer, convert the adjustable AC power of the ground system into direct current and supply it to downhole instruments; the fifth and sixth cable cores (5#, 6#) of the seven-core cable Connect the ground communication control system and the downhole communication control system through the communication transformer, carry out the communication signal transmission between the surface ...

Embodiment 2

[0065] As in Example 1 and attached figure 1 In the casing downhole measurement cable multiplexing device and its working method, the power supply transformer adopts a C-type iron core power supply transformer, and the C-type iron core power supply transformer is provided with two primary coils and a secondary coil, and the two primary coils The parameters are symmetrical; the C-type iron core power supply transformer includes an iron core, a wire package and lead wires, and the lead wires include six primary coil lead wires and two secondary coil lead wires. The first AC power supply panel I is arranged on the secondary coil of the C-type iron core power supply transformer On the side, the first cable core, the second cable core (1#, 2#), the third cable core, and the fourth cable core (3#, 4#) are respectively connected in parallel to the primary coil side of the C-type core power supply transformer. The ground system uses the first AC power supply panel I to provide 50HZ ad...

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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...

Claims

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Application Information

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IPC IPC(8): E21B47/12G01V3/22
CPCE21B47/12G01V3/22Y02A30/00
Inventor 曹旭东颜肖平曹卫东李俊杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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