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A calibration method for a production logging well temperature instrument

A well temperature and instrument technology, which is applied in the field of new calibration of production logging well temperature instruments, can solve the problems of small range of adjustable resistance resistance, low calibration accuracy, and large influence of temperature drift, so as to reduce well temperature The effect of measuring error, improving adjustment accuracy and saving adjustment time

Active Publication Date: 2017-09-01
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

The relationship between the temperature t and the frequency f of the output well temperature signal satisfies the formula: f=90t+1600; this method of manually adjusting the adjustable resistance for instrument calibration has low calibration accuracy, many repeated calibration times, and the influence of temperature drift Large, adjustable resistance range is small and other disadvantages

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  • A calibration method for a production logging well temperature instrument
  • A calibration method for a production logging well temperature instrument
  • A calibration method for a production logging well temperature instrument

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] refer to figure 1 The block diagram of the instrument circuit, including well temperature probe PT1000, fixed resistors R1, R2 temperature acquisition circuit module, single-chip microcomputer STC89C52, and drive circuit module. in:

[0038] The temperature acquisition circuit module is used to collect, amplify, and shape the voltage signal of the well temperature probe, and transmit it to the single-chip microcomputer;

[0039] The well temperature probe can measure the change of external temperature by detecting the change of temperature;

[0040] The driving circuit module is used to transmit the output signal of the single-chip microcomputer to the ground operating system;

[0041] The single-chip microcomputer, through the relational expression g=kf+b / 25 of its input signal pulse number and output signal pulse number, r...

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Abstract

The invention discloses a calibration method for production of a temperature logging instrument. The calibration method comprises the steps that a resistor R1 and a resistor R2 are selected; resistance of a temperature logging probe at zero DEG C is measured, and the number of pulse f1 of a 40 ms input signal at zero DEG C is obtained; resistance of the temperature logging probe at 100 DEG C is measured, and the number of the pulse f2 at 100 DEG C is obtained; respectively putting the measured f1, f2 into the formula (please see the formula in the specification) is conducted; the number of output signal pulse of a microcontroller at zero DEG C and the number of the output signal pulse of the microcontroller at 100 DEG C are obtained respectively, and values of k and b are obtained; writing the values of k and b in the formula (please see the formula in the specification) in procedures of the microcontroller is conducted, and the calibration method for the production of the temperature logging instrument is completed. By means of the calibration method for the production of the logging temperature instrument, the microcontroller is adopted to conduct circuit calibration, a currently used calibration method that adjustable resistors are adjusted through manual work is replaced; the calibration is simple and convenient, the accuracy is high, and the influence of the temperature drift is small.

Description

technical field [0001] The invention relates to well logging temperature instruments in oil and gas production wells, in particular to a new adjustment method for production logging well temperature instruments. Background technique [0002] Well temperature logging in oil and gas production wells is one of the most important methods in production logging methods. It can solve many problems in the production process of the well, such as the accurate division of the production layer, the determination of casing channeling and fluid loss, the judgment of the fractured well section after sand fracturing and the effect evaluation, etc. This is of great significance for oil and gas field development and production well evaluation. The basic principle of well temperature logging: the relationship between ground temperature and depth is basically a straight line, and the slope of the ground temperature gradient is the temperature difference between two points with a depth differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/07
CPCE21B47/07
Inventor 程峰刘国权颜紫荆杨永发陈强董斌任丽娟郭英才陈光建区广宇刘李春王鲁王丽
Owner BC P INC CHINA NAT PETROLEUM CORP
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