Testing apparatus for internal corrosion of circulating multiphase flow undulating pipeline

Abstract

The invention discloses a testing apparatus for internal corrosion of circulating multiphase flow undulating pipeline, belonging to the technical field of multiphase flow internal corrosion test of oil and gas pipelines. The apparatus is mainly composed of a gaseous phase closed circulating system, a liquid phase closed circulating system, a gaseous phase and liquid phase separation system, a temperature control system, a multiphase flow undulating pipeline system, an on-line corrosion testing system and a plurality of control valves; the gaseous phase and liquid phase separation system realizes effective separation of the gaseous phase and the liquid phase through a two-stage gaseous phase and liquid phase separation apparatus; a high-pressure gasholder, a high-pressure gas cylinder and various valves in the gaseous phase closed circulating system regulate the gaseous phase pressure and the rate of flow to be steady; the multiphase flow undulating pipeline is composed of two kinds of pipelines which have different pipe diameters, pipe materials or pipe internal coatings, and the pipeline can be set to have different inclined angles; and three detection methods based on hangers, electrochemistry and inductance are set in the testing system. The testing apparatus is used for implementing the circulating corrosion test on a dry gas, wet gas and oil-gas-water three-phase mixed transportation undulating pipeline under different conditions, wherein the gas in the pipeline contains corrosive gas, such as CO2, H2S and the like; and simultaneously, the testing apparatus can perform corrosion prevention evaluation on corrosion inhibitors and pipeline internal coatings.

Description

technical field [0001] The invention relates to an experimental device for internal corrosion of a circulating multiphase flow fluctuating pipeline, in particular to a simulated CO2-containing 2 , H 2 S and other corrosive dry gas, wet gas or oil-gas-water three-phase mixed transmission fluctuating pipeline corrosion circulation test device. Background technique [0002] Corrosion occupies a very important position in "oil and gas pipeline engineering". The statistical analysis of the failure of oil and gas pipelines shows that 60% of the failures are related to the corrosion of pipeline steel. Especially in the process of oil and gas development in my country in recent years, a large amount of H 2 S, CO 2 Such acid gases have caused serious damage to oil and gas pipelines. h 2 S, CO 2 As an associated gas of oil and gas extraction, resulting in H 2 S, CO 2 The corrosion problem is prominent, and the corrosion results are very serious. Corrosion during the developm...

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Problems solved by technology

The utility model patent with the publication number CN2575660Y discloses an experimental device for indoor corrosion research in the process of oil and gas production, gathering and transportation, and sewage treatment, but the patent does not consider important issues such as the recycling of corrosive gases and the measurement of corrosion parameters.

The invention patent with the publication number CN101226134A discloses a corrosion experimental device that can be applied in the laboratory and on site, but the patent does not consider the recycling of corrosive gas and the influence of pipeline inclination on corrosion, and is not suitable for dry gas or wet gas systems Corrosion experiment

The patent for invention with the publication number CN101975744A relates to a test device for scouring corrosion of metal components in seawater piping systems, but the patent is only applicable to liquid phase corrosion, not to multiphase flow corrosion experiments

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