A control system and control method for a logging drilling type borehole wall coring device

Abstract

The invention discloses a control system of a logging drilling sidewall coring tool. The control system comprises a drilling coring ground control box, a winch depth device, a variable frequency power source, a downhole instrument circuit part and a downhole instrument hydraulic part, wherein data acquisition and feedback control are performed on the coring tool through the drilling coring ground control box, various states of a downhole instrument can be detected in time through the downhole instrument circuit part, the power supply state of a downhole motor and the power supply state of the downhole instrument are monitored through a sensor, and the downhole motor can be adjusted and controlled by processing acquired data and controlling the variable frequency power source. According to a control method, automatic control over coring of the coring tool is achieved through the ground control box, an execution motor can be continuously started, a backup arm expands, the stretching displacement of a punch pin is minimal, the pressure of a second pump is maximal, a hydraulic motor rotates, a drill bit stretches out, the hydraulic motor stops rotating when the drilling displacement reaches the core breaking position, and a series of continuous actions that the core breaking drill bit retreats and is taken back is completed.

Description

technical field [0001] The invention belongs to the field of geological exploration, and relates to controlling a drilling-type borehole wall coring device to drill cores vertically from a downhole destination layer, in particular to a control system and a control method for a drilling-type borehole wall coring device. Background technique [0002] At present, in the Chinese patent 200620008135.3, a drilling type sidewall coring device is proposed, which is composed of a ground control system and a downhole coring system. The cables are connected, the ground control system provides high-voltage, high-current power supply to the motor of the downhole coring system, and then the motor drives the hydraulic pump to provide hydraulic energy to the downhole coring system, and the downhole coring system is manipulated to perform coring; The ground control system is composed of ground pressure regulating cabinet, boosting cabinet, control cabinet and logging winch, which are connect...

AI Technical Summary

Problems solved by technology

[0005] However, since the maximum output current of the motor drive power supply is much smaller than the stall value of the motor, when the load of the drill bit suddenly increases and the motor current increases rapidly, the drive power supply cannot supply more current to maintain the rotation of the motor, and it will stop feeding the motor itself. Power supply, turn to restart the motor, so that the drill bit stuck engineering accident cannot be found when drilling the core, and the operator cannot make a correct judgment in time, and cannot issue a drill back command to release the jam in time, so that the drill bit is stuck and damaged Downhole Instruments

[0006] Moreover, when the drilling sidewall corer is working downhole, the operator needs to make a decision based on the first pump pressure value, the second pump pressure value displayed on the ground control panel, the working voltage and current of the motor, and the values ​​of various displacement sensors. Comprehensive analysis and judgment can only be carried out before the operation of various control instruments. When the operation is wrong, the hydraulic components will be easily damaged, resulting in engineering accidents.

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