An online monitoring device and method for sand carrying amount of oil and gas subsea pipeline based on electric bridge balance

Abstract

The invention relates to an oil-gas subsea pipeline silt carrying capacity online monitoring device and method based on bridge balance. The device comprises a first branch pipe, a second branch pipe, an electric rotation device, a transmission shaft, a support shell, sensing elements, a constant-voltage power supply system, a data acquisition system, an one-chip microcomputer, and a computer. The pipeline is provided with a through hole, the support shell is vertically inserted into the pipe through the through hole; the first branch pipe is fixed on the through hole and is connected to the second branch pipe; the electric rotation device is fixedly arranged on the top of the second branch pipe, the output shaft of the electric rotation device is fixedly connected to the top of the support shell through the transmission shaft; four lateral surfaces of the support shell are four erosion surfaces, a sensing element is fixed on each erosion surface; four sensing elements form a balance bridge; the voltage-constant power supply system supplies power to the balance bridge under a constant voltage (U) through the data acquisition system, the data acquisition system is used to collect the balance bridge output signal u(t) and send the signal u(t) to the one-chip microcomputer and computer in real time; and finally the computer can obtain the amount of sand discharged from the subsea pipeline according to the change of the signal u(t).

Description

technical field [0001] The invention relates to an on-line monitoring device and method for sand-carrying capacity of an oil-gas subsea pipeline, in particular to an on-line monitoring device and method for sand-carrying capacity of an oil-gas subsea pipeline based on electric bridge balance. Background technique [0002] In view of the contradiction between sand production and sand control in loose sandstone and weakly cemented formations, and considering the actual situation that some formations are prone to sand production, it is proposed that in the case of moderate sand production in the formation, it is more economical and faster to control the sand production by adjusting the imported output. develop oil and gas reservoirs. However, the unremoved sand acts on the production equipment such as elbows and valves through the flow of the fluid. When the sand production is serious, it will cause wear and perforation of the production facilities, which poses a great threat t...

AI Technical Summary

Problems solved by technology

Although the ER method has the advantages of simple measurement and wide application range, the weak resistance change has high requirements on the data acquisition circuit. Whether the thickness reduction value can be accurately represented is related to the monitoring error of the erosion monitoring system. The accuracy fluctuates greatly with the site conditions, and the response to low-concentration sand erosion monitoring is relatively slow. In addition, the effective service life of the detector sensing element 20 is relatively short

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