Downhole instrument electrical measurement method and system
A downhole instrument and voltage measurement technology, which is applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve the problem of inaccurate cable head voltage and other problems
Inactive Publication Date: 2016-05-11
CNPC GREATWALL DRILLING ENG
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Problems solved by technology
[0005] The purpose of the present invention is to provide a reasonable and effective method and system for measuring the voltage of the cable head of downhole instruments, which solves the problem that the existing method of measuring the voltage of the cable head of downhole instruments ignores the temperature and load current and affects the power supply transformer in the downhole remote transmission instrument. The disadvantage of inaccurate cable head voltage due to the influence of transformation ratio
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[0068] according to figure 1 Test block diagram, connecting the variable ratio characteristic test environment of the downhole remote transmission instrument power supply transformer;
[0069] exist figure 1 Among them, the computer is the ground logging computer of the logging system, on which the logging software runs, and all logging services and logging equipment are controlled by the computer; the PSP panel is the ground AC power control box, which is mainly responsible for power supply, ground voltage and current Measurement and measurement of the cable head voltage of downhole instruments; figure 1 A CSP panel is shown in , but it is an optional device. That is to say, it can be adapted to CSP without switching the cable core; the STP panel is the ground remote transmission box, which is mainly responsible for communicating with the downhole remote transmission equipment and sending ground control commands to the downhole remote transmission equipment , receive and d...
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The invention relates to an electric logging method and a system for subsurface instruments. The method comprises the steps of: (I) measuring each parameter value of well logging instruments of different electronic loads at a room temperature; (II) fitting the measured parameter values used for measuring so as to obtain a fitting polynomial for calculating a subsurface instrument cable head voltage; (III) measuring the subsurface instrument cable head voltage using the fitting polynomial obtained in the step (II); (IV) verifying the measurement precision of the fitting polynomial obtained in the step (II); (V) changing the temperature of a subsurface remote transmission instrument, recording each parameter value of the well logging instruments at different temperatures and electronic loads; (VI) fitting the various parameter values obtained in the step (V) so as to obtain a temperature modification item of the fitting polynomial; (VII) modifying the fitting polynomial so as to enable the fitting polynomial to include the temperature modification item; and (VIII) measuring the subsurface instrument cable head voltage using the obtained fitting polynomial with the temperature modification item.
Description
technical field [0001] The present invention relates generally to electrical measurements in the field of well logging. More specifically, the present invention relates to a method and system for measuring cable head voltage of a downhole tool. Background technique [0002] Downhole instrument cable head voltage measurement is an important function in the downhole power supply system of petroleum logging instruments. The cable head voltage of the downhole instrument string must be controlled within the allowable range of the instrument's working voltage. If the cable head voltage exceeds the working voltage range of the instrument, the instrument will not work normally, or even damage the instrument. Therefore, when the instrument is powered on, the voltage of the cable head of the instrument is controlled within the target range, and the voltage of the downhole instrument string cable head is monitored in real time during the subsequent logging process, and the power suppl...
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IPC IPC(8): G01R19/00
Inventor 陈文轩陈仕学裴彬彬戴光明朱新楷
Owner CNPC GREATWALL DRILLING ENG