A measuring method of a fixed volume tube piston type natural gas wet gas flowmeter

Abstract

The invention provides a constant-volume tube piston type natural gas moisture flowmeter which comprises a constant-volume cylindrical measuring tube and a built-in piston which can move up and down. Two ends of the measuring tube are respectively connected with two electric valves to control air intake and exhaust reversing, and the measuring tube can be controlled to achieve down air intake and up exhaust measuring and up air intake and down exhaust measuring. A temperature and pressure transmitter is further mounted on the measuring tube, and natural gas moisture volume flow measuring can be achieved. Due to the fact that the constant-volume tube piston type natural gas moisture flowmeter is based on the volume measuring, the measuring process is irrelevant with physical parameters and the flowing parameters such as flow speed and flow state of to-be-measured natural gas moisture, measuring flow is not easily influenced by flow fluctuation, and high precision is achieved.

Description

technical field [0001] The invention belongs to the technical field of wet gas flow metering for associated gas produced in crude oil wells and natural gas produced in natural gas wells, and relates to a measuring method for a constant volume tube piston type natural gas wet gas flowmeter. Background technique [0002] In most cases in the process of oil and gas field exploitation. The production of natural gas is always accompanied by the production of liquid hydrocarbons, free water and saturated water vapor. Therefore, wet gas metering is involved in the process of natural gas from single well production to multi-well gathering and transportation, purification treatment, and pressurized transportation. Since the measurement of single well production is closely related to the economic interests of the producer, and the measurement data of a single well is also an important data for oil and gas field managers to understand the production capacity and production status of g...

AI Technical Summary

Problems solved by technology

[0004] 1. The wet gas state in the pipeline is different due to the gas pressure, flow velocity, liquid content in the pipeline and the installation position of the pipeline (horizontal, inclined or vertical), and the flow state is more complicated

[0005] 2. The working conditions of the wet gas measurement site vary greatly. If the flowmeter is unreasonably selected, it is easy to cause the flowmeter used to be unsuitable for the working conditions of the measurement site, and even cause the flowmeter to be damaged.

[0006] 3. Most of the flowmeters used for wet gas measurement adopt the off-line verification method, but the verification medium and working conditions of the general verification or calibration laboratory are very different from the actual medium and working conditions, which makes the on-site measurement of the flowmeter performance is difficult to guarantee

However, at present, the wet gas measurement at home and abroad mainly adopts the traditional unidirectional flow flow technology. Due to the existence of the liquid phase in the pipeline, the flow state in the pipeline seriously affects the measurement performance of the flowmeter. According to the latest experimental research, its measurement error up to 15%

Images