Device and method for measuring adsorbed sulfur content based on solvent dissolution principle

Abstract

The invention discloses a device for measuring adsorbed sulfur content based on a solvent dissolution principle. The device comprises a high-temperature and high-pressure pump, a high-temperature andhigh-pressure sulfur-resistant reaction kettle, a valve, a constant-speed and constant-pressure pump, a solvent container, a high-temperature and high-pressure rock core holder, a simulated rock coreand a back pressure valve; the simulated rock core is arranged in the high-temperature and high-pressure rock core holder, the high-temperature and high-pressure sulfur-resistant reaction kettle and the solvent container are connected to one end of the high-temperature and high-pressure rock core holder in parallel through branch pipelines, and the back pressure valve is in pipeline connection tothe other end of the high-temperature and high-pressure rock core holder; and a high-temperature and high-pressure pump, a constant-speed and constant-pressure pump and a valve are respectively arranged on the pipeline for connecting the high-temperature and high-pressure sulfur-resistant reaction kettle and the solvent container to the high-temperature and high-pressure rock core holder. According to the method, elemental sulfur is comprehensively introduced into the simulated rock core, gas is used for displacing elemental sulfur which is not adsorbed by the rock core, an evaluation test process for the maximum adsorption capacity of sulfur fixation of the reservoir and the damage degree range of sulfur fixation to the reservoir is established, and a reference can be provided for development of a high-sulfur-content gas field according to production conditions of the actual gas reservoir.

Description

technical field [0001] The invention belongs to the technical field of exploration and development of high-sulfur natural gas reservoirs, in particular to a device and method for measuring adsorbed sulfur content based on the principle of solvent dissolution. Background technique [0002] my country's sulfur-containing gas reservoirs are mainly distributed in the Ordos Basin, Tarim Basin, and Sichuan Basin. The main characteristics of this type of gas reservoirs are: deep gas reservoir burial, high hydrogen sulfide content, and large geothermal gradient. During the process, as the gas continues to be produced and the formation pressure continues to drop, elemental sulfur will be precipitated from the gas, which will block the natural gas seepage channel, reduce the effective pore space and permeability of the formation, and affect the productivity of the gas well. It can be seen that the research on the formation sulfur deposition model is very necessary. [0003] When sulfu...

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Problems solved by technology

However, at present, the understanding of the adsorption capacity of the reservoir for sulfur fixation and the extent of damage to the reservoir by sulfur fixation is still quite limited, and there are few studies on the adsorption of sulfur fixation in the reservoir, and there is a lack of quantified reservoirs. The experimental data of the sulfur-fixed adsorption capacity; and the clarification of the adsorption of sulfur-fixed in porous media and the grasp of the maximum adsorption capacity of the formation for sulfur-fixed can provide an important experimental basis for the prevention and control of sulfur deposition. Therefore, a method that can simulate the actual Formation conditions, and an experimental device for studying the maximum adsorption capacity of the formation for sulfur fixation and the extent of damage to the reservoir by sulfur fixation

[0004] In addition, in the current common experimental devices for sulfur deposition, the core samples are mostly displaced by sulfur-containing gas to obtain the deposition results of sulfur in the core in the core. In general, the elemental sulfur carried by the gas is difficult to be fully introduced into the pores, so that the adsorption of sulfur fixation in the simulated formation cannot reach saturation, and it is difficult to realize the study of the maximum adsorption capacity of sulfur fixation in the formation

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