High-precision low-flow detection device based on constant power

Abstract

The invention discloses a high-precision low-flow detection device based on constant power and belongs to the technical field of petroleum logging instruments. The device comprises a constant-power sensor and a detection processing transmission circuit connected with the constant-power sensor, wherein the detection processing transmission circuit is installed in a circuit installation shell, the constant-power sensor is installed in a flow sensor installation shell, the circuit installation shell and the flow sensor installation shell are connected in a screw-thread fit mode, and the free endof the circuit installation shell and the free end of the flow sensor installation shell are both sealed to form a pressure-bearing sealed column structure; and the constant-power sensor is composed of a constant-power heater and a temperature sensor, wherein the constant-power heater and the temperature sensor are oppositely installed at the two ends inside the flow sensor installation shell, anda gap is reserved between the end of the constant-power heater and the end of the temperature sensor. The device overcomes the limitation on starting discharge capacity of a traditional flow logginginstrument, a mechanical rotation device does not need to be arranged, the defect of a logging instrument in a domestic low liquid-producing well is overcome, and the device has the advantages of highsensitivity, high precision, simple structure and high stability.

Description

technical field [0001] The invention belongs to the technical field of petroleum logging instruments, and in particular relates to a high-precision low-flow detection device based on constant power. Background technique [0002] In the process of oil field production, in order to detect the changing parameters in the development well in time, it is necessary to carry out production logging after casing. Well instruments include tracer flowmeters, turbine flowmeters, ultrasonic flowmeters, and electromagnetic flowmeters. Tracer flowmeters are chemical source radioactive instruments that pollute formation water; turbine flowmeters, ultrasonic flowmeters, and electromagnetic flowmeters Dispersion is large, the start-up displacement is higher than 5 cubic meters per day, and 80% of the development wells in most oil fields are low-permeability wells, and the flow rate is lower than 3 cubic meters per day. Therefore, the above-mentioned existing flow detection instruments cannot m...

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Problems solved by technology

[0002] In the process of oil field production, in order to detect the changing parameters in the development well in time, it is necessary to carry out production logging after casing. Well instruments include tracer flowmeters, turbine flowmeters, ultrasonic flowmeters, and electromagnetic flowmeters. Tracer flowmeters are chemical source radioactive instruments that pollute formation water; turbine flowmeters, ultrasonic flowmeters, and electromagnetic flowmeters Dispersion is large, the start-up displacement is higher than 5 cubic meters per day, and 80% of the development wells in most oil fields are low-permeability wells, and the flow rate is lower than 3 cubic meters per day. Therefore, the above-mentioned existing flow detection instruments cannot meet the requirements of low-permeability well production needs

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