Gas-liquid two-phase metering device

Abstract

The invention discloses a gas-liquid two-phase metering device comprising a gas-liquid communicating tube (1), a first pressure difference transmitter (4) and a second pressure difference transmitter (5). A V-tapered throttling element (2) and a Venturi throttling element (3) are arranged at an interval in the gas-liquid communicating tube (1). The first pressure difference transmitter (4) and the V-tapered throttling element (2) are connected. The second pressure difference transmitter (5) is connected with the Venturi throttling element (3). The V-tapered throttling element (2) is arranged on the upstream section of the gas-liquid communicating tube (1), and the Venturi throttling element (3) is arranged on the downstream section of the gas-liquid communicating tube (1). The V-tapered throttling element and the Venturi throttling element are arranged in the gas-liquid communicating tube and are connected with the pressure difference transmitters respectively, so that the problem that gas and liquid shall be individually metered after being separated in the natural-gas single well metering technique is solved, and non-separation online continuous metering of gas output and liquid output of a natural-gas single well is realized.

Description

technical field [0001] The invention relates to the field of metering equipment, in particular to a gas-liquid two-phase metering device, which is mainly used for real-time on-line measurement of gas production and liquid production under the condition that gas and liquid are not separated during natural gas production. Background technique [0002] In the process of natural gas production, the gas production rate and liquid production rate of gas wells are one of the important data of gas field production management. They are not only an important basis for formulating production technology, determining production process and production management methods, but also optimizing gas field production allocation and ensuring the rational exploitation of gas reservoirs. basic data. [0003] The measurement of natural gas single well production belongs to the measurement of two-phase or multi-phase flow, and the measurement method of single-phase instrument combination is mostly u...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: neither the separation metering process in the station nor the online metering process at the wellhead can effectively measure the liquid production of natural gas wells

Among them, the liquid production rate is estimated by the separator discharge electric ball valve switching times used in the separation and measurement process in the station. Since the liquid discharged from the electric ball valve is not the same every time it is opened and closed, the measurement error of single well liquid production is large; wellhead online measurement The process even ignores the measurement of gas well liquid production. Due to the existence of the liquid phase, the actual flow rate of the gas phase increases, and the complex interaction between the gas and liquid phases makes the actual measurement difference of the gas volume too high, resulting in a single Measuring Error of Well Gas Production

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