Z-type natural gas moisture real-time measuring device and method based on in-pipe phase separation

Abstract

The invention provides a Z-type natural gas moisture real-time measuring device based on in-pipe phase separation. The device mainly consists of a gas-liquid coarse separation system, a two-stage cyclone, a two-stage pipeline type compact gas-liquid separator, a derotator, a gas flowmeter, a temperature sensor, a pressure sensor, a U-shaped liquid collecting pipe, a liquid flowmeter and an ejection type gas-liquid mixer. The measuring method of the device provided by the invention is to achieve complete gas-liquid separation by using the multi-phase flow tube internal phase separation technology, in combination with the gravity separation and by means of multiple separation steps, and then to measure the flow rates of the gas phase and the liquid phase in natural gas moisture by using a single-phase flowmeter. By adoption of the Z-type natural gas moisture real-time measuring device provided by the invention, the separation efficiency of gas and liquid in the moisture can be greatly improved, the gas-liquid measurement accuracy is ensured, meanwhile the volume of a separator is greatly reduced, and the instantaneity of moisture measurement is improved. In addition, the moisture measuring device and method involved in the invention have the advantages of wide applicable flow parameter range, high safety performance and low manufacturing cost, and are very suitable for popularization and application in engineering.

Description

technical field [0001] The invention belongs to the technical field of multiphase flow flow measurement. Specifically, the invention relates to a Z-type natural gas moisture real-time measurement device based on phase separation in a pipe, and also relates to a Z-type natural gas moisture real-time measurement method based on phase separation in a pipe . Background technique [0002] Normally, when natural gas is extracted from the ground to the surface, it will always carry a part of the liquid, which may be crude oil in the formation, condensate oil produced due to the reduction of temperature and pressure during the production process, formation water, injection water or Fracturing flowback fluid, etc. In the oil and gas industry, the mixture of natural gas and liquid phase produced in such gas wells is called "wet gas". The volumetric gas content of gas in wet gas is often greater than 90%, and the volumetric gas content of most gas wells is between More than 97%, and ...

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Problems solved by technology

The gas-liquid separators involved in these patents rely on cyclone separation or gravity separation. For wet gas, due to the high gas velocity and small liquid volume, the liquid has a strong followability with the air flow. In order to complete the gas-liquid For complete separation, it is necessary to increase the diameter of the separator to reduce the gas velocity, increase the height of the separator to increase the residence time of the moisture in the separator, and often need to set some structures inside the separator to strengthen the gas-liquid separation, so The separator has a large volume and complex structure, which is not convenient for gas well wellhead measurement

In addition, the large-diameter gas-liquid separator is a pressure vessel, which has high manufacturing costs and has high requirements for the production process and operating environment.

[0006] In summary, although the existing wet gas, gas-liquid non-separation measurement method is small in size, it relies too much on the empirical multi-phase measurement model, so it has the disadvantages of low measurement accuracy and narrow application range; while the existing gas-liquid separation Although the method of re-measurement has high measurement accuracy, it has the disadvantages of large separator, complex structure, high manufacturing cost, high process and operation requirements, and inconvenient installation at the wellhead.

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