A Wellbore Annular Pressure Sensor Based on Variable Displacement Mechanism

Abstract

The invention discloses a wellbore annular pressure sensor based on a variable displacement mechanism, which includes a deformation chamber, a circuit chamber, a cable waterproof joint, and an armored cable; The first electrode plate and the second electrode plate on the side form a capacitance by the first electrode plate and the second electrode plate, and measure its capacitance value through the circuit board; the interior of the deformation chamber is provided with a guide plate, which passes through the guide plate and is used to reflect The displacement rod for the deformation displacement of the deformation chamber, the first connecting rod and the second connecting rod connected to the displacement rod, the annular pressure of the wellbore causes the deformation of the deformation chamber to drive the first connecting rod, the second connecting rod, and the displacement rod inside The movement of the displacement rod between the first electrode plate and the second electrode plate will change its capacitance value; the circuit board is connected with the armored cable, and the capacitance value is transmitted in real time through it. The sensor of the present invention uses a variable displacement mechanism to measure pressure, has high precision, small volume, and is suitable for the environmental requirements of drilling conditions.

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 a variable displacement mechanism. 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...

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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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