Arc-shaped pipe based flow metering device and metering method for multiphase flow

Abstract

The invention relates to a flow metering device for multiphase flow. The flow metering device for multiphase flow comprises the following constructional elements: a pipeline containing at least one section of an arc-shaped pipe, wherein the cross section of the arc-shaped pipe is in a circular shape, the plane where the arc-shaped pipe is located is vertical-oriented, and the arc-shaped pipe is provided with at least one vertical-oriented cross section; a gamma-ray explorer, wherein the gamma-ray detector comprises a gamma-ray emitter and a gamma-ray detector, the gamma-ray emitter and the gamma ray detector are respectively arranged on the upper side and the lower side of the vertical-oriented cross section of the arc-shaped pipe in a distributed mode, gamma ray emitted by the gamma-ray emitter passes through in a radial or non-radial mode along the vertical-oriented cross section of the arc-shaped pipe and arrives at a gamma-ray receiver, and the gamma-ray explorer is a monoenergetic gamma-ray explorer or a dual-energetic gamma-ray explorer; and total volume flow measurement equipment, wherein the total volume flow measurement equipment is placed in the upstream or downstream of the arc-shaped pipe and is used for calculating multiphase flow total volume flow. The invention further relates to a method measuring each phase volume flow in multiphase flow by utilizing the flow metering device for multiphase flow.

Description

technical field [0001] The invention belongs to the field of multiphase flow flow measurement. Specifically, the present invention relates to a multiphase flow metering device based on an arc tube, and to a method for measuring the flow of each phase in a multiphase flow using the arc tube based multiphase flow metering device. Background technique [0002] In the oil production industry, gas-liquid mixed fluids containing liquid and gas phases are often extracted from oil wells, which is often referred to as "wet gas" in the industry. Moisture is essentially a multiphase flow, that is, a mixed fluid of gaseous and liquid phases. The gas phase includes, for example, oilfield gas or any non-condensable gas at normal temperature, wherein the oilfield gas is generally lighter alkanes such as methane, ethane, propane, butane and the like. The liquid phase may include: an oil phase, such as crude oil itself and liquid additives dissolved in the crude oil during crude oil produc...

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Problems solved by technology

However, because the separator and related auxiliary facilities weigh tens of tons, occupy an area of ​​tens of square meters, and have many control links, the maintenance and management of the separator are very complicated, which is not conducive to the automation of production process management, especially in deserts and Used in offshore oil fields

This method of separation before measurement is not an online real-time measurement method. The measurement accuracy is highly dependent on the gas-liquid separation effect, and the gas-liquid separation effect is heavily dependent on the specific flow conditions. In a word, the gas-liquid separation measurement method relies on gravity There are many defects in practical application

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