A wellbore annular pressure sensor based on machine vision

Abstract

The invention discloses a wellbore annulus pressure sensor based on machine vision. The wellbore annulus pressure sensor comprises a deformation cabin, a sealing cover, a circuit cabin, a cable waterproof joint and an armored cable; the deformation cabin is internally provided with a first displacement plate, a second displacement plate, a fixing seat, a camera and a light-emitting tube, wherein the camera and the light-emitting tube are fixed to the fixing seat; wellbore annulus pressure causes deformation of the deformation cabin, thus the first displacement plate and the second displacementplate in the deformation cabin are driven to move, the light-emitting tube illuminates the first displacement plate and the second displacement plate, and the camera takes pictures of the first displacement plate and the second displacement plate; a circuit board is arranged in the circuit cabin and connected with the armored cable, the camera and the light-emitting tube; and the circuit board processes the pictures of the camera, thus displacement of the first displacement plate and the second displacement plate is obtained, the wellbore annulus pressure value is calculated based on displacement, and then the wellbore annulus pressure value is sent in real time through the armored cable. The wellbore annulus pressure sensor adopts a visual principle to measure the pressure, and is high in precision, small in size and suitable for drilling working condition environment requirements.

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 machine vision. 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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