Capillary pressure measuring device

Abstract

The invention provides a capillary tube pressure measuring device, comprising a singlechip system, a current-to-voltage circuit, an A / D conversion circuit, a signal processing system, a display circuit and a serial communication circuit, wherein the singlechip system controls the whole machine; the current-to-voltage circuit converts input pressure current signals into voltage signals; an input end of the A / D conversion circuit is connected with the current-to-voltage circuit and the singlechip system; a circuit of the signal processing system is connected with the singlechip system; an input end of the display circuit is connected with the singlechip system; and the serial communication circuit is connected with the singlechip system. The pressure measuring device adopts the singlechip system to accomplish the data acquisition of pressure and temperature; the signal processing system realizes complicated iterative algorithm, thereby improving the precision and execution efficiency of the system; a communication interface not only has the serial communication between the signal processing system and an external computer, but also has the data transmission between a singlechip and the display circuit. The pressure measuring device has the advantages of small volume, convenience for carrying, high pressure measuring precision, accurate and rapid measured data, real-time monitoring and display, etc., which can be used for monitoring the pressure in oil-gas wells.

Description

technical field [0001] The invention belongs to the technical field of pressure measurement, and in particular relates to a capillary pressure measurement device. Background technique [0002] Capillary pressure measurement technology uses nitrogen or inert gas as the pressure transmission medium to transmit the downhole pressure to the surface, and completes the pressure test on the surface. According to the corresponding mathematical algorithm, the pressure at the depth of the downhole pressure measurement is calculated by using the measured pressure. [0003] The pressure measurement principle of the capillary pressure measurement system adopts Pascal's theorem, that is, the pressure at any point in a sealed container is equal. The capillary pressure measuring device used for downhole pressure monitoring consists of downhole structure and surface system. The downhole structure includes: wellhead traverser, cable packer traverser, capillary steel pipe, pressure transmissi...

AI Technical Summary

Problems solved by technology

But it also fails to give the realization principle of the data acquisition and analysis unit

[0012] From the above, for the capillary downhole pressure detection system, what we can see from the literature is only the introduction of the principle, and the pressure acquisition and processing circuit on the ground is not given.

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