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Underground full-borehole thermal type flow measuring device

A thermal flow, measuring device technology, applied in measuring device, measuring flow/mass flow, liquid/fluid solid measurement, etc., can solve the problem that thermal flowmeter cannot measure flow accurately, and achieve the effect of improving the measuring range

Pending Publication Date: 2021-01-12
PETROCHINA CO LTD +1
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  • Claims
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Problems solved by technology

[0004] The problem to be solved by the invention: In the environment where the measured fluid in the downhole of the oil field is liquid and the flow rate of the whole wellbore varies greatly, the thermal flowmeter cannot accurately measure the flow rate

Method used

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  • Underground full-borehole thermal type flow measuring device
  • Underground full-borehole thermal type flow measuring device
  • Underground full-borehole thermal type flow measuring device

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Embodiment Construction

[0020] The specific temperature measurement principle of the technical solution provided by the present invention: when the downhole full-bore thermal flow measurement device is working, the electric heater 3 with constant power heats the body 4 to increase its temperature. The body 4 as an intermediate heat transfer medium exchanges heat with the measured fluid in contact with it, and achieves thermal balance; records the measured value of the measured temperature sensor after the thermal balance, and converts and converts the power supply device 6 to obtain the corresponding flow value at the moment. In this way, the method in which the heater 3 heats the intermediate heat transfer medium, and then conducts it to the measured fluid through the intermediate heat transfer medium, compared with the method of directly placing the heater 3 and the temperature sensor in the fluid in the traditional thermal flowmeter, the temperature caused by the change of the flow rate is more accu...

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Abstract

The invention relates to the technical field of flow measurement, in particular to an underground full-borehole thermal type flow measuring device. By adding the intermediate heat-conducting medium, the temperature change of the intermediate medium is measured, and the problem that the flow measurement reference quantity is difficult to extract and generate due to the fact that the heat capacity coefficient of liquid is large and the temperature change is not obvious during high flow is solved. Meanwhile, a plurality of temperature sensors are arranged at different positions in the body, different positions have different temperature change ranges, the value in the optimal temperature range can be selected from the temperature sensors to serve as a reference value for calculating flow, theflow measurement range is greatly widened, and the problems that the flow change range from top to bottom under an oil field well is large, and measurement is difficult are solved.

Description

technical field [0001] The invention relates to the technical field of flow measurement devices, in particular to a downhole full borehole thermal flow measurement device. [0002] technical background [0003] At present, the downhole fluid flow measurement sensors in oil fields are mainly collector type turbine flowmeters. Due to many unstable factors in the current collection measurement method, and because the rotating part of the turbine flowmeter contains magnetic steel, the fluid carries sand and ferromagnetism, and the downhole turbine flowmeter is often stuck, which seriously affects the reliability of the measurement. As a stable thermal flowmeter with no moving parts, it has been attracting attention and has been tried for downhole fluid measurement. Due to its structural characteristics, the thermal flowmeter can be designed as a full-bore non-collecting structure. Thermal flow meters use the principle of heat diffusion. Traditional thermal flow meters have two ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/69
CPCG01F1/69
Inventor 庄海军蔡兵贲亮刘慧东张永余李楠
Owner PETROCHINA CO LTD
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