Wellbore annular pressure sensor based on micro-ranging

Abstract

The invention discloses a wellbore annular pressure sensor based on micro-ranging. The wellbore annular pressure sensor comprises a deformation chamber, an end cap, a cable waterproof joint and an armored cable, wherein the end cap is connected with the deformation chamber; the cable waterproof joint is connected with the end cap; the armored cable passes through the cable waterproof joint and theend cap; a fixing plate, a circuit board arranged on the fixing plate, a ranging plate, and an ultrasonic probe arranged on the ranging plate are arranged inside the deformation chamber; the annularpressure of a wellbore causes deformation of the deformation chamber, and changes the distance between a mounting surface and an opposite surface of the ultrasonic probe inside the wellbore; the distance between the mounting surface and the opposite surface is measured by the ultrasonic probe; the circuit board is connected with the armored cable and the ultrasonic probe; and the circuit board calculates the wellbore annular pressure value based on the measured distance of the ultrasonic probe, and transmits the wellbore annular pressure value in real time through the armored cable. The sensordisclosed by the invention measures the pressure by adopting the principle of ultrasonic ranging, has relatively high accuracy, and is small in size and suitable for the requirements of a drilling condition environment.

Description

technical field [0001] The invention relates to the technical field of geological drilling and instrumentation, in particular to a wellbore annular pressure sensor based on micro-ranging. Background technique [0002] In recent years, with the acceleration of urbanization in China, the demand for energy has increased, and energy issues have become an important factor restricting my country's economic and social development. Therefore, energy exploration and development must be accelerated. In the stage of energy exploration and subsequent development, it is necessary to use drilling technology to evaluate and exploit energy, so drilling is a prerequisite for energy development. [0003] Drilling is the process of using drilling rig equipment and rock-breaking tools to break the formation, thereby forming a hole from the surface to the earth at different depths. The traditional drilling process is generally composed of drilling rigs, drill pipes and drill bits. Among them, ...

AI Technical Summary

Problems solved by technology

At the present stage, most of the existing pressure sensors measure based on the principle of strain, and the radial volume of the sensor is relatively large, which is in contradiction with the narrow space in the radial dimension of the borehole annulus (the radial dimension of the borehole annulus is sometimes only 2 mm in width). , making existing pressure sensors unusable downhole

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