Built-in signal detection sensor for sand production of oil-gas wells

Abstract

The invention provides a built-in signal detection sensor for sand production of oil-gas wells. The sensor comprises a metal rod 1 which can be inserted into a pipeline, wherein the surface of the tail end of the metal rod 1 is surrounded with a piezoelectric film 2; the outer surface of the piezoelectric film 2 is covered with a PET metal film 3 for protection; the surface of the upper end of the metal rod 1 is provided with a screw 4 and a nut 5; a cavity 6 is arranged above the nut 5; a protection box 8 is buckled on the cavity 6; and a signal-conditioning circuit board 7 is arranged in the cavity 6. The sensor is inserted into an oil / gas conveying pipeline with sand; sand in fluid collides with the lower end of the metal rod 1; the piezoelectric film 2 generates charge between two poles after sensing the collision of the sand, and a coaxial cable 10 transmits charge signals to the signal-conditioning circuit board 7; and the charge signals are processed by the signal-conditioning circuit board 7 and then are output by a lead 11. The sensor has the characteristic of high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a built-in oil and gas well sand production signal detection sensor for real-time sand production monitoring of oil and gas wells. Background technique [0002] In the process of oil and gas extraction in oil fields, reasonable sand production from oil and gas wells can improve oil and gas production efficiency, but severe sand production will damage petroleum machinery, which will bring major hidden dangers to safe production and seriously affect production efficiency, so real-time monitoring Oil and gas wells produce sand, and the prediction of sand production is of great significance to oil and gas development. [0003] The sand production monitoring of oil and gas wells mostly adopts the acoustic measurement method, and there is no sensor used for sand production signal detection in China at present. The technical situation abroad is as follows: [0004] The sensor mentione...

AI Technical Summary

Problems solved by technology

When a constant current is applied to the metal probe, this change in resistivity will inevitably cause a change in the voltage on the probe, so that the sand content in the oil, gas and water can be calculated, but the biggest disadvantage of the sensor is its short service life. When replacing the sensor , will affect the normal production

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