Improved oilfield downhole electromagnetic flowmeter

Abstract

The invention discloses an improved oilfield downhole electromagnetic flowmeter which comprises a sleeve, wherein the hollow structure of the sleeve and a lower-end sealing connector are combined to form an excitation coil placement bin; an excitation coil framework is arranged in the excitation coil placement bin; an encapsulation coating is arranged on the outer side of the sleeve; two inward concave electrode slice storage grooves are formed in positions where the encapsulation coating corresponds to the excitation coil framework; electrode slices are fixed in the storage grooves through the encapsulation coating; an excitation coil lead perforation for communicating a circuit tube and the excitation coil placement bin is arranged at the solid end of the sleeve; an excitation coil is mounted on the excitation coil framework; a lead-out wire of the excitation coil penetrates through the excitation coil lead perforation and is connected with a circuit board in the circuit tube. The electrode slices are positioned on the outer surface of the sleeve, so that the pressure-resistant capability of the sleeve is greatly improved; a high-pressure sealing plug is arranged in the sleeve, so that the impact of external mechanical impact force is avoided. Therefore, the overall pressure-resistant capability and reliability of the improved oilfield downhole electromagnetic flowmeter are remarkably improved.

Description

technical field [0001] The invention relates to downhole flow measurement technology in the oilfield field, in particular to an improved oilfield downhole electromagnetic flowmeter. Background technique [0002] With the gradual reduction of petroleum energy, the future trend of oilfield exploitation is to enter low-permeability, ultra-low-permeability, heavy oil fields and marginal oil fields with small reserves. Due to the geological characteristics of low permeability, low pressure, and low abundance, these oil fields have brought great challenges to the development of oil fields. At the same time, the natural production capacity of these oil fields is low, and oil wells need to be fractured to be put into production. Because most of its oil layers are low-pressure unsaturated lithologic reservoirs, lack of natural energy supplement, and the natural energy is mainly driven by elasticity and dissolved gas, so the development production of these oil fields declines rapidly,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an improved oil field downhole electromagnetic flowmeter, which solves the problems of poor pressure resistance and easy damage of the current oil field downhole electromagnetic flowmeter, so as to improve the pressure resistance and expand its application range.

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