A testing device for sulfur deposition in sour natural gas gathering and transportation pipelines

Abstract

The invention discloses a sulfur-containing natural gas gathering and transportation pipeline sulfur deposition testing device, which comprises a supply system, a sulfur deposition testing system, a data image collection system, and a tail gas recovery system. The beneficial effects of the present invention are: the device can realize precise control of the concentration of sulfur particles, and simulate the actual deposition of sulfur particles in natural gas gathering and transportation pipelines, especially in inverted Z-shaped risers and horizontal bends where sulfur deposition is prone to occur. At the valve, it is possible to analyze the influence of variables such as pressure, gas flow, sulfur particle size, sulfur particle flow, valve opening, and bend ratio on the sulfur deposition law, and greatly improve the critical suspension velocity, deposition rate, and cumulative deposition of sulfur particles. The measurement accuracy of the amount; the data image acquisition system can monitor the pressure and flow changes in the test section in real time, and can record the image data of the dynamic change of sulfur deposition in the pipeline in real time. It has the advantages of high measurement accuracy, intuitive experimental results, and good safety performance.

Description

technical field [0001] The invention belongs to the technical field of oil and gas pipelines, and in particular relates to a sulfur deposition testing device for sulfur-containing natural gas gathering and transportation pipelines. Background technique [0002] There are abundant resources of high-sulfur gas reservoirs in my country, which are mainly distributed in the western regions of China such as Changqing, Chongqing, and Sichuan, and the cumulative proven reserves are as high as 1×10 12 m 3 , the development potential is huge. In high-sulfur gas reservoirs, elemental sulfur exists stably in natural gas in the form of physical dissolution and chemical dissolution in a high temperature and high pressure environment. However, after the high-sulfur natural gas flows into the surface gathering and transportation pipeline system with the wellbore, the pressure and temperature decrease. When the elemental sulfur concentration is higher than the solubility of sulfur in natur...

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Problems solved by technology

[0003] At present, in the disclosed sulfur deposition measurement device: the device (CN109060616) can carry out the sulfur deposition experiment in the wellbore, but it cannot accurately control the concentration of sulfur particles, and when the magnetic levitation balance is used to measure the sulfur deposition in the pipeline, the simultaneous measurement of the wellbore itself and The scheme of the weight of sulfur deposition, due to the heavy weight of the wellbore itself, cannot accurately measure the critical suspension velocity, deposition rate, and cumulative deposition amount of sulfur particles in the wellbore when the sulfur particles are deposited in a small amount; the device (CN110108444) can carry out sulfur deposition experiments in pipelines , the gas source uses on-site high-sulfur gas, which cannot control the concentration of sulfur particles. Sampling and weighing are used for sulfur deposition, which has a large human error, and it is impossible to realize the dynamic observation of the sulfur deposition process in the pipeline.

Therefore, the existing sulfur deposition test device is mainly limited by the following aspects, so that it cannot truly reflect the deposition law of sulfur particles in the pipeline: (1) precise control of the concentration of sulfur particles; (2) critical suspension velocity of sulfur particles, deposition Accurate measurement of rate and cumulative deposition; (3) Dynamic observation of sulfur deposition process

In addition, in sour natural gas gathering and transportation pipelines, sulfur deposits are mainly deposited at throttle valves and bends of pipe fittings. Currently, there is no device to measure sulfur deposits at the above two places.

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